Knowledge management practices in a regional economic bloc secretariat: a case of Southern African development community
- Authors: Sikazwe, Dennis
- Date: 2019
- Subjects: Knowledge management
- Language: English
- Type: Thesis , Doctoral , PhD (Library and Information Science)
- Identifier: http://hdl.handle.net/10353/11451 , vital:39073
- Description: The effective application of appropriate Knowledge Management Practices (KMPs) is one of the innovative and creative ways for improving organisational work processes. Having been undertaken in a Regional Economic Bloc (REB) at the SADC Secretariat in Gaborone, Botswana, and at the SPGRC in Lusaka, Zambia, the study assesses KMPs among employees in these worksites. However, not all KMPs adopted can be appropriate. For example, studies show that the western epistemological perspective of knowledge that gives preference to leveraging explicit knowledge at the expense of tacit knowledge seems to be dominant in most organisations, just as evidenced in this study. This study was aimed at achieving to a limited extent exploratory and descriptive goal. The study was solidly grounded on the practice-based approach of knowing and learning in organisations, the OKC-SECI, and the dialogic Communication theories. It was aimed at assessing what, how and to what extent have KMPs utilized among REBs in the course of their day to day operations (SADC secretariat in particular). Using these theories, the study clearly shows how appropriate KMPs help improve secretariat’ work processes in any given REB secretariat’ everchanging work environment, and how it’s tested knowledge is stored, shared and applied as best practices. The study further assessed the conduciveness of the secretariat’s workplace environment in which such practices are carried out, and how appropriate the KM related ICTs available in that environment were. The theoretical underpinnings of the study were used to inform the selection of variables for the study. The approach of the study was firstly to understand what and how knowledge (both explicit and tacit) is generated, stored, shared and applied among the secretariat employees, and the focus was on the above theories. The study made use of the triangulated research approach to adequately capture and analyse both qualitative and quantitative data. By so doing, reliability and validity were enhanced. The copies of the questionnaire were administered to 138 employees of the catchment areas, and only 117 copies of the questionnaire were completed and returned for processing. From the returned copies of the questionnaire, 15 respondents whose responses vi appeared to have addressed the research questions were followed up for in-depth interviews. For qualitative data, the in-depth interviews were used together with the observation of the respondents’ behaviour, workplace environment and the appropriateness of the KM related ICTs available. Data obtained from the study were processed and analysed using SPSS for the quantitative data, while responses from the interviews and observations were sorted and coded. The process of comparing the processed quantitative and qualitative data resulted in the drawing of inferences that resolve the research problem. The study findings clearly show that the SADC secretariat was relatively good in the utilisation of appropriate KLPs; however, this was on average at a very low rate (32, 27.44%; Good), and mostly limited to the management of Information Resource Centres (47, 40.47%; Fair). This was followed by Explicit Knowledge Leveraging Practices (KLPs) (36, 30.75%; Good), while Tacit KLPs were rated the least with a (29, 25.20%; Bad) rating. The study findings further indicated that the conduciveness of the SADC secretariat workplace environment was on average fairly rated (61, 52.55%; Fair), with minimal opportunities for socialisation and collaborative work. The appropriateness of KM-related ICTs available at the secretariat was on average rated moderately at (41, 35.00%) Very good, though they were described as blind to the human, social and cultural aspects of KMPs. Finally, the study findings also revealed that the SADC secretariat was particularly rated bad (54, 45.87%) in finding possible KMP solutions, and was rated very good (51, 43.60%) in identifying the actual major challenges for managing KMPs. The use of a practice-based approach, OKC-SECI and Dialogic Communication theories to underpin the study were found suitable for investigating KMPs from a REB secretariat’s work processes context. The practice-based approach and the Dialogic Communication theory were particularly useful in addressing the issue of interaction, dialogue and sense-making in the workplace while the OKC-SECI theory helped understand knowledge conversion processes at the SADC secretariat. The findings of this study seem to propose that KMPs and KM, in general, can best be studied using a combination of methodologies because of the multi-disciplinary nature of the subject. The study, thus, proposes the “practice – theory – practice “knowledge creation and sharing workplace framework.
- Full Text:
- Date Issued: 2019
- Authors: Sikazwe, Dennis
- Date: 2019
- Subjects: Knowledge management
- Language: English
- Type: Thesis , Doctoral , PhD (Library and Information Science)
- Identifier: http://hdl.handle.net/10353/11451 , vital:39073
- Description: The effective application of appropriate Knowledge Management Practices (KMPs) is one of the innovative and creative ways for improving organisational work processes. Having been undertaken in a Regional Economic Bloc (REB) at the SADC Secretariat in Gaborone, Botswana, and at the SPGRC in Lusaka, Zambia, the study assesses KMPs among employees in these worksites. However, not all KMPs adopted can be appropriate. For example, studies show that the western epistemological perspective of knowledge that gives preference to leveraging explicit knowledge at the expense of tacit knowledge seems to be dominant in most organisations, just as evidenced in this study. This study was aimed at achieving to a limited extent exploratory and descriptive goal. The study was solidly grounded on the practice-based approach of knowing and learning in organisations, the OKC-SECI, and the dialogic Communication theories. It was aimed at assessing what, how and to what extent have KMPs utilized among REBs in the course of their day to day operations (SADC secretariat in particular). Using these theories, the study clearly shows how appropriate KMPs help improve secretariat’ work processes in any given REB secretariat’ everchanging work environment, and how it’s tested knowledge is stored, shared and applied as best practices. The study further assessed the conduciveness of the secretariat’s workplace environment in which such practices are carried out, and how appropriate the KM related ICTs available in that environment were. The theoretical underpinnings of the study were used to inform the selection of variables for the study. The approach of the study was firstly to understand what and how knowledge (both explicit and tacit) is generated, stored, shared and applied among the secretariat employees, and the focus was on the above theories. The study made use of the triangulated research approach to adequately capture and analyse both qualitative and quantitative data. By so doing, reliability and validity were enhanced. The copies of the questionnaire were administered to 138 employees of the catchment areas, and only 117 copies of the questionnaire were completed and returned for processing. From the returned copies of the questionnaire, 15 respondents whose responses vi appeared to have addressed the research questions were followed up for in-depth interviews. For qualitative data, the in-depth interviews were used together with the observation of the respondents’ behaviour, workplace environment and the appropriateness of the KM related ICTs available. Data obtained from the study were processed and analysed using SPSS for the quantitative data, while responses from the interviews and observations were sorted and coded. The process of comparing the processed quantitative and qualitative data resulted in the drawing of inferences that resolve the research problem. The study findings clearly show that the SADC secretariat was relatively good in the utilisation of appropriate KLPs; however, this was on average at a very low rate (32, 27.44%; Good), and mostly limited to the management of Information Resource Centres (47, 40.47%; Fair). This was followed by Explicit Knowledge Leveraging Practices (KLPs) (36, 30.75%; Good), while Tacit KLPs were rated the least with a (29, 25.20%; Bad) rating. The study findings further indicated that the conduciveness of the SADC secretariat workplace environment was on average fairly rated (61, 52.55%; Fair), with minimal opportunities for socialisation and collaborative work. The appropriateness of KM-related ICTs available at the secretariat was on average rated moderately at (41, 35.00%) Very good, though they were described as blind to the human, social and cultural aspects of KMPs. Finally, the study findings also revealed that the SADC secretariat was particularly rated bad (54, 45.87%) in finding possible KMP solutions, and was rated very good (51, 43.60%) in identifying the actual major challenges for managing KMPs. The use of a practice-based approach, OKC-SECI and Dialogic Communication theories to underpin the study were found suitable for investigating KMPs from a REB secretariat’s work processes context. The practice-based approach and the Dialogic Communication theory were particularly useful in addressing the issue of interaction, dialogue and sense-making in the workplace while the OKC-SECI theory helped understand knowledge conversion processes at the SADC secretariat. The findings of this study seem to propose that KMPs and KM, in general, can best be studied using a combination of methodologies because of the multi-disciplinary nature of the subject. The study, thus, proposes the “practice – theory – practice “knowledge creation and sharing workplace framework.
- Full Text:
- Date Issued: 2019
La masculinité dans quelques oeuvres des romanciers Francophones Africains
- Joseph, Joy Ifeanyichukwu Osarumwense
- Authors: Joseph, Joy Ifeanyichukwu Osarumwense
- Date: 2019
- Subjects: Masculinity in literature , Men in literature , African fiction (French) -- History and criticism , Bâ, Mariama. Chant écarlate , Fassinou, Adélaïde, 1955-.Modukpè le rêve brisé , Sanusi, Ramonu Abiodun, 1961-.Le bistouri des larmes , Sanusi, Ramonu Abiodun, 1961-.Un nègre a violé une blonde à Dallas , Baboni, Azaratou.Vie de femme, vie de sang
- Language: French
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/97512 , vital:31446 , DOI 10.21504/10962/97512
- Description: This thesis is a sociocritic and comparative study in Francophone African Literature which examines how male and female authors depict masculinity amongst African men in selected works of Francophone authors and how it affects the emancipation of women in the society. These include Mariama Bâ’s Un chant écarlate (1981) from Senegal, Adelaïde Fassinou’s Modukpè le rêve brisé (2000) from Benin, Ramonu Sanusi’s Le bistouri des larmes (2005, 2010) from Nigeria, Azaratou Baboni’s Vie de femme, vie de sang, (2011) from Benin, Ramonu Sanusi’s Un nègre a violé une blonde à Dallas, (2016) from Nigeria. The study analyses the various forms of masculinity in the selected works of Francophone authors. The study also examines the notable similarities and differences in the portrayal of male characters in the novel and how prevailing environmental factors determine the themes in the novel. This study has demonstrated that hegemonic and marginalized forms of masculinity are the dominant forms of masculinity in West Africa. These forms of masculinity have negative effects not only on the woman but affects the society in general. Furthermore, the study pleads for a social change with respect to Molara Leslie-Oguundipe’s theory on stiwanism (Ogundipe 1994: 229-230) The thesis is made of six chapters. In the first chapter, we outlined the study’s subject matter, its aims and objectives, its significance, its assumptions and methodology. In the second chapter, we examined Raewyn Connell’s theory of Masculinity and Molara Leslie-Ogundipe’s theory of Stiwanism with respect to the selected novels. Raewyn Connell’s theory on masculinity a sociological theory was employed in analyzing the social patterns of societal relationships, social interaction and culture, while Molara Leslie-Ogundipe’s theory on stiwanism a literary theory mirrored the West African Society. Such analyses helped us in identifying how socio-cultural and religious contexts influence the attitude of men towards women. In the third chapter, we applied sociocritic and comparative analyses between Mariama’s Bâ’s Un Chant Écarlate and Adelaïde’s Fassinou’s Modukpè le rêve brisé. The study focuses on how hegemonic and marginalized forms of masculinity influences racial discrimination in mixed marriages, polygamy, unwanted pregnancy, secondary sterility and single motherhood. These masculinities had negative effects on women and the society. The study also analyzed how both male and female characters employed stiwanist strategy in enhancing peace and harmony in the society. In the fourth chapter, the study examined how hegemonic and marginalized forms of masculinity influenced domestic violence, primary sterility, female genital mutilation and its negative and permanent damage to the health of women, the loss of lives of women and children in Ramonu Sanusi’s Le bistouri des larmes and Baboni Azaratou’s Vie de femme, vie de sang. The study also examined how women can rise above traditional norms with respect to stiwanist activites. The fifth chapter analyzed the influence of socio-cultural and political challenges in a contemporary society with respect to marginalized form of masculinity. In the sixth chapter, the study concluded that hegemonic and marginalized forms of masculinity are the dominant forms of masculinity. These forms of masculinites have negative effects on both sexes (male and female) as well as the society.
- Full Text:
- Date Issued: 2019
- Authors: Joseph, Joy Ifeanyichukwu Osarumwense
- Date: 2019
- Subjects: Masculinity in literature , Men in literature , African fiction (French) -- History and criticism , Bâ, Mariama. Chant écarlate , Fassinou, Adélaïde, 1955-.Modukpè le rêve brisé , Sanusi, Ramonu Abiodun, 1961-.Le bistouri des larmes , Sanusi, Ramonu Abiodun, 1961-.Un nègre a violé une blonde à Dallas , Baboni, Azaratou.Vie de femme, vie de sang
- Language: French
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/97512 , vital:31446 , DOI 10.21504/10962/97512
- Description: This thesis is a sociocritic and comparative study in Francophone African Literature which examines how male and female authors depict masculinity amongst African men in selected works of Francophone authors and how it affects the emancipation of women in the society. These include Mariama Bâ’s Un chant écarlate (1981) from Senegal, Adelaïde Fassinou’s Modukpè le rêve brisé (2000) from Benin, Ramonu Sanusi’s Le bistouri des larmes (2005, 2010) from Nigeria, Azaratou Baboni’s Vie de femme, vie de sang, (2011) from Benin, Ramonu Sanusi’s Un nègre a violé une blonde à Dallas, (2016) from Nigeria. The study analyses the various forms of masculinity in the selected works of Francophone authors. The study also examines the notable similarities and differences in the portrayal of male characters in the novel and how prevailing environmental factors determine the themes in the novel. This study has demonstrated that hegemonic and marginalized forms of masculinity are the dominant forms of masculinity in West Africa. These forms of masculinity have negative effects not only on the woman but affects the society in general. Furthermore, the study pleads for a social change with respect to Molara Leslie-Oguundipe’s theory on stiwanism (Ogundipe 1994: 229-230) The thesis is made of six chapters. In the first chapter, we outlined the study’s subject matter, its aims and objectives, its significance, its assumptions and methodology. In the second chapter, we examined Raewyn Connell’s theory of Masculinity and Molara Leslie-Ogundipe’s theory of Stiwanism with respect to the selected novels. Raewyn Connell’s theory on masculinity a sociological theory was employed in analyzing the social patterns of societal relationships, social interaction and culture, while Molara Leslie-Ogundipe’s theory on stiwanism a literary theory mirrored the West African Society. Such analyses helped us in identifying how socio-cultural and religious contexts influence the attitude of men towards women. In the third chapter, we applied sociocritic and comparative analyses between Mariama’s Bâ’s Un Chant Écarlate and Adelaïde’s Fassinou’s Modukpè le rêve brisé. The study focuses on how hegemonic and marginalized forms of masculinity influences racial discrimination in mixed marriages, polygamy, unwanted pregnancy, secondary sterility and single motherhood. These masculinities had negative effects on women and the society. The study also analyzed how both male and female characters employed stiwanist strategy in enhancing peace and harmony in the society. In the fourth chapter, the study examined how hegemonic and marginalized forms of masculinity influenced domestic violence, primary sterility, female genital mutilation and its negative and permanent damage to the health of women, the loss of lives of women and children in Ramonu Sanusi’s Le bistouri des larmes and Baboni Azaratou’s Vie de femme, vie de sang. The study also examined how women can rise above traditional norms with respect to stiwanist activites. The fifth chapter analyzed the influence of socio-cultural and political challenges in a contemporary society with respect to marginalized form of masculinity. In the sixth chapter, the study concluded that hegemonic and marginalized forms of masculinity are the dominant forms of masculinity. These forms of masculinites have negative effects on both sexes (male and female) as well as the society.
- Full Text:
- Date Issued: 2019
Land Reform and the Challenge of Rural Development in Zimbabwe: The Case of the Fast Track Reform in Mashonaland West Region
- Authors: Chigarira, Tangai Sylvester
- Date: 2019
- Subjects: Land reform -- Zimbabwe Agriculture and state -- Zimbabwe Zimbabwe -- Politics and government
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/18665 , vital:42704
- Description: A largely agricultural country, land remains an important factor of production and a critical element in the livelihoods of rural Zimbabweans. Small-scale farmers rely on land for food and income. The post-independence development of Zimbabwe has been tied to land holding. As such, land reform aimed at addressing colonial racial land inequalities and rural underdevelopment became an imperative. In the post-independence era, Zimbabwe undertook two phases of land reform – the first occurred between 1980 and 1999 and was known as the Land reform and Resettlement Programme (LRRP). This was based on the ‘willing-buyer and willing seller’. The second phase which took place from 2000, known as the Fast Track Land Reform Programme (FTLRP), took a radical approach. However, due to a variety of reasons, including the dominance of small-scale farming and challenges of land reform, agricultural productivity remains low. Moreover, despite land reform, including massive land redistribution, the process appears incomplete and inconclusive. This is so essentially because the land reform neither increased food production nor reduced poverty. Accordingly, sustainable development remains a distant reality, especially among rural small-scale farmers. The study aimed at assessing the impact of the fast track land reform (FTLRP) on poverty reduction and sustainable rural development in Zimbabwe. Despite undertaking one of Southern Africa’s largest post-colonial redistributive land reform to date, the provision of land on its own has not been sufficient to address rural poverty and achieving meaningful rural development. This is so because the land reform has not articulated integrated growth as remoteness and poverty remain endemic, which is connected to the land. So, resolving the land question still remains crucial for sustainable rural development in Zimbabwe.
- Full Text:
- Date Issued: 2019
- Authors: Chigarira, Tangai Sylvester
- Date: 2019
- Subjects: Land reform -- Zimbabwe Agriculture and state -- Zimbabwe Zimbabwe -- Politics and government
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/18665 , vital:42704
- Description: A largely agricultural country, land remains an important factor of production and a critical element in the livelihoods of rural Zimbabweans. Small-scale farmers rely on land for food and income. The post-independence development of Zimbabwe has been tied to land holding. As such, land reform aimed at addressing colonial racial land inequalities and rural underdevelopment became an imperative. In the post-independence era, Zimbabwe undertook two phases of land reform – the first occurred between 1980 and 1999 and was known as the Land reform and Resettlement Programme (LRRP). This was based on the ‘willing-buyer and willing seller’. The second phase which took place from 2000, known as the Fast Track Land Reform Programme (FTLRP), took a radical approach. However, due to a variety of reasons, including the dominance of small-scale farming and challenges of land reform, agricultural productivity remains low. Moreover, despite land reform, including massive land redistribution, the process appears incomplete and inconclusive. This is so essentially because the land reform neither increased food production nor reduced poverty. Accordingly, sustainable development remains a distant reality, especially among rural small-scale farmers. The study aimed at assessing the impact of the fast track land reform (FTLRP) on poverty reduction and sustainable rural development in Zimbabwe. Despite undertaking one of Southern Africa’s largest post-colonial redistributive land reform to date, the provision of land on its own has not been sufficient to address rural poverty and achieving meaningful rural development. This is so because the land reform has not articulated integrated growth as remoteness and poverty remain endemic, which is connected to the land. So, resolving the land question still remains crucial for sustainable rural development in Zimbabwe.
- Full Text:
- Date Issued: 2019
Land rental policy and land market in Mashonaland East Province, Zimbabwe: implications on farmer decisions, efficiency and equity under A1 and A2 models
- Authors: Tatsvarei , Simbarashe
- Date: 2019
- Subjects: Farms, Small Agricultural extension work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15666 , vital:40501
- Description: Government promulgated the land rental policy starting in the year 2007. The policy required that A1 (market residual) and A2 (indigenous commercial) farmers pay rentals to the state. Since then, there has also been an emerging trend in which farmers have been renting in and out land, resulting in an informal market for land rentals. The study therefore assessed farmers’ perceptions of land rental policy and evaluated the possible association of this policy to farmers’ decision making on land rental markets as well as its implications on farmers’ efficiency and equity. The study was carried out in Mashonaland East Province of Zimbabwe, covering two districts, Goromonzi and Marondera. The focus was specifically on A1 and A2 farmers, as the rental policy was directed at these resettlement models only and much of the informal land rental markets were prevalent among these categories of farmers. Data collection utilised the survey approach. This was supported by key informant interviews and focus group discussions, with a final sample of 339 households selected using multi-stage sampling method. Survey data were transcribed on CsPro 6, and analysed using Stata, SPSS and Frontier 4.1. Results showed that about a third of household respondents was from Marondera and twothirds was from Goromonzi, while 79% and 21% was A1 and A2 farmers respectively. About 80% was male headed households and the remainder was female headed households. About half of the households were not participating in land rental markets while the other half was split almost equally between those renting-in and renting-out land. In general, A2 farmers were better in agricultural productivity than A1 farmers. It was concluded that farmers had a fairly good knowledge of the agricultural land rental policy enunciated in the Finance Bills. A1 farmers were more knowledgeable than A2 farmers, but no vii significant differences were observed between male and female headed households and farmers involved and not involved in land rental markets. Farmers’ attitudes in relation to policy were categorised as fair, with significant differences based on gender and land market participation. Practice scores showed a poor adherence to policy for all categories of farmers. Overall perceptions of farmers on rental policy was inferred as fair with significant differences existing between land rental market participants and non-participants (autarky). The results of a bivariate Tobit model results showed that the decision to rent-in land was significantly influenced by gender, household income, permanent labour, cultivated area, tenure certainty, irrigable land size and crop diversification. On the other hand, age, permanent labour, irrigable land size and crop diversification significantly influenced farmers’ decisions to rent-out land. The conclusion was that household characteristics, land endowments and transaction costs significantly influenced the decision to rent-in land while the former two were strong in influencing renting-out decisions. Results from the linearized Cobb Douglas model showed that economic efficiency for most farmers was above 50%. Farmers renting-out land under A1 were found to be the most economically efficient, followed by those who were renting-in and least efficient were farmers not participating in land rental markets, though the differences were marginal. For the A2 model, renting-in farmers were the most efficient, followed by those in autarky position, while renting-out farmers were the least. Overall, the most efficient farmers were those renting-in, followed by those renting-out while farmers in autarky were the least efficient. Overall efficiency was higher for A2 farmers than for A1 farmers. For farmers not participating in rental markets, the sources of inefficiency were crop type, crop area and labour. For farmers renting-in, it was proportion of irrigable land, size of irrigable land, crop type, crop area and viii labour, while inefficiency drivers for renting-out farmers were crop type and associated area. Equity analysis showed that participation in land rental markets reduced inequality for farmers in the two districts and male and female headed households. Inequality was increased among A1 farmers and remained unchanged among A2 farmers. Overall, the emerging position was that participation in land rental markets resulted in higher efficiency and reduced inequality in land holding among the sampled farmers. It is recommended that government should be consistent on land rental policy and bring into place effective administration of land rental policy. Government may also consider formal acceptance of land rental markets in light of the marginal efficiency and equity benefits shown in the study. However, formalizing land rental markets alone may not be a panacea to improved efficiency and needs to be supported by other productivity measures given the average efficiency values for farmers. Crop and livestock production based on compatibility with the natural regions and defined minimum size of land should be encouraged to improve efficiency
- Full Text:
- Date Issued: 2019
- Authors: Tatsvarei , Simbarashe
- Date: 2019
- Subjects: Farms, Small Agricultural extension work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15666 , vital:40501
- Description: Government promulgated the land rental policy starting in the year 2007. The policy required that A1 (market residual) and A2 (indigenous commercial) farmers pay rentals to the state. Since then, there has also been an emerging trend in which farmers have been renting in and out land, resulting in an informal market for land rentals. The study therefore assessed farmers’ perceptions of land rental policy and evaluated the possible association of this policy to farmers’ decision making on land rental markets as well as its implications on farmers’ efficiency and equity. The study was carried out in Mashonaland East Province of Zimbabwe, covering two districts, Goromonzi and Marondera. The focus was specifically on A1 and A2 farmers, as the rental policy was directed at these resettlement models only and much of the informal land rental markets were prevalent among these categories of farmers. Data collection utilised the survey approach. This was supported by key informant interviews and focus group discussions, with a final sample of 339 households selected using multi-stage sampling method. Survey data were transcribed on CsPro 6, and analysed using Stata, SPSS and Frontier 4.1. Results showed that about a third of household respondents was from Marondera and twothirds was from Goromonzi, while 79% and 21% was A1 and A2 farmers respectively. About 80% was male headed households and the remainder was female headed households. About half of the households were not participating in land rental markets while the other half was split almost equally between those renting-in and renting-out land. In general, A2 farmers were better in agricultural productivity than A1 farmers. It was concluded that farmers had a fairly good knowledge of the agricultural land rental policy enunciated in the Finance Bills. A1 farmers were more knowledgeable than A2 farmers, but no vii significant differences were observed between male and female headed households and farmers involved and not involved in land rental markets. Farmers’ attitudes in relation to policy were categorised as fair, with significant differences based on gender and land market participation. Practice scores showed a poor adherence to policy for all categories of farmers. Overall perceptions of farmers on rental policy was inferred as fair with significant differences existing between land rental market participants and non-participants (autarky). The results of a bivariate Tobit model results showed that the decision to rent-in land was significantly influenced by gender, household income, permanent labour, cultivated area, tenure certainty, irrigable land size and crop diversification. On the other hand, age, permanent labour, irrigable land size and crop diversification significantly influenced farmers’ decisions to rent-out land. The conclusion was that household characteristics, land endowments and transaction costs significantly influenced the decision to rent-in land while the former two were strong in influencing renting-out decisions. Results from the linearized Cobb Douglas model showed that economic efficiency for most farmers was above 50%. Farmers renting-out land under A1 were found to be the most economically efficient, followed by those who were renting-in and least efficient were farmers not participating in land rental markets, though the differences were marginal. For the A2 model, renting-in farmers were the most efficient, followed by those in autarky position, while renting-out farmers were the least. Overall, the most efficient farmers were those renting-in, followed by those renting-out while farmers in autarky were the least efficient. Overall efficiency was higher for A2 farmers than for A1 farmers. For farmers not participating in rental markets, the sources of inefficiency were crop type, crop area and labour. For farmers renting-in, it was proportion of irrigable land, size of irrigable land, crop type, crop area and viii labour, while inefficiency drivers for renting-out farmers were crop type and associated area. Equity analysis showed that participation in land rental markets reduced inequality for farmers in the two districts and male and female headed households. Inequality was increased among A1 farmers and remained unchanged among A2 farmers. Overall, the emerging position was that participation in land rental markets resulted in higher efficiency and reduced inequality in land holding among the sampled farmers. It is recommended that government should be consistent on land rental policy and bring into place effective administration of land rental policy. Government may also consider formal acceptance of land rental markets in light of the marginal efficiency and equity benefits shown in the study. However, formalizing land rental markets alone may not be a panacea to improved efficiency and needs to be supported by other productivity measures given the average efficiency values for farmers. Crop and livestock production based on compatibility with the natural regions and defined minimum size of land should be encouraged to improve efficiency
- Full Text:
- Date Issued: 2019
Large scale spatio-temporal forcing of pelagic-coastal coupling: disentangling the effects of environmental change on intertidal invertebrate recruitment
- Authors: Muñiz, Carlota Fernández
- Date: 2019
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/75317 , vital:30400
- Description: Marine systems are driven by the relationships among organisms and environmental conditions. Anthropogenic-induced changes during the past decades have started to alter climatic drivers which have the potential to alter the physical, chemical and biological environment. In coastal systems, biogeography is influenced by the temporal variability in the conditions of the water mass. In addition, many marine benthic organisms develop in the water mass and rely on the conditions that link the pelagic and benthic systems for population maintenance. Such pelagic-coastal coupling indicates that changes in the trophic system during development can be transferred to the adult populations through changes in propagule supply. Thus, changes in environmental conditions can influence benthic populations directly (e.g. through larval advection) or indirectly, through their influence on the phytoplankton community (e.g. through the development of HABs). The South African coastline shows clear alongshore patterns of faunal biomass and species richness. On the south coast, strong longitudinal patterns of recruitment of intertidal organisms exist, with areas of particularly high recruitment. HABs of unprecedented spatio-temporal magnitude have recently developed along the south coast, including the areas where benthic recruitment is most intense. The present thesis used these blooms to study changes in intertidal recruitment directly or indirectly associated with their occurrence. Using a combination of remote sensing data to study the environmental conditions of the water mass in the innermost part of the Agulhas Bank, and estimates of mussel and barnacle recruitment rates to integrate the effects of conditions in the water mass during larval development, this thesis aimed to: (1) understand the conditions that triggered the development of an HAB of the dinoflagellate Lingulodinium polyedrum during summer of 2014, (2) determine the direct or indirect effects of that bloom on recruitment of intertidal organisms, and understand the factors that affect recruitment along the coast, (3) determine if the environmental factors during bloom development produced any carryover effects on recruit growth and mortality, and (4) determine the factors that drive changes in community biomass and composition along the south coast, the long-term trends in those factors, and possible changes experienced in recent years. Water column stability during spring, before the development of the red tide, followed by alternating periods of upwelling and relaxation during summer and autumn, seemed to promote the development and persistence of L. polyedrum. Recruitment of mussels and barnacles was estimated during the reproductive season of mussels in 2014, coinciding with the red tide, and during the following year. Alongshore patterns in recruitment were found, with higher mussel recruitment in the absence of the red tide and the opposite pattern in barnacles. Alongshore patterns in SST and chlorophyll matching those of recruitment were also found, with higher SSTs and lower chlorophyll during the red tide than the following year. Growth and mortality rates in barnacles did not differ between years during the first five months after settlement. This suggests that the factors which produced differences in recruitment between years did not produce carryover effects detectable at the temporal scales studied. Further analysis of 15 years of satellite-derived environmental data showed significant cooling trends potentially driven by a long-term seasonal acceleration of the Agulhas Current in autumn around two upwelling centres on the south coast, coinciding temporally with the reproductive period of mussels and barnacles, and spatially with the areas of highest recruitment. In addition, the comparison of SST and chl-a conditions during the first and the second half of the period of study showed that seasonality of both variables has changed in large areas over the shelf, with increasing importance of shorter-term variability, which would in turn decrease environmental predictability. Thus, the conditions observed during the present study, particularly during 2015, when upwelling seemed to be more intense, may presage the potential effects of identified long-term cooling trends at the upwelling centres. Although the general trend shows cooling around those areas, conditions can vary greatly among years, favouring different taxa. Changes in the Agulhas Current System are affected by changes in distant areas in the Indian Ocean basin. Such tele-connection is unlikely to be unique to this system and indicates the importance of understanding trends in major large scale climatic drivers and their regional effects in order to make predictions about coastal systems.
- Full Text:
- Date Issued: 2019
- Authors: Muñiz, Carlota Fernández
- Date: 2019
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/75317 , vital:30400
- Description: Marine systems are driven by the relationships among organisms and environmental conditions. Anthropogenic-induced changes during the past decades have started to alter climatic drivers which have the potential to alter the physical, chemical and biological environment. In coastal systems, biogeography is influenced by the temporal variability in the conditions of the water mass. In addition, many marine benthic organisms develop in the water mass and rely on the conditions that link the pelagic and benthic systems for population maintenance. Such pelagic-coastal coupling indicates that changes in the trophic system during development can be transferred to the adult populations through changes in propagule supply. Thus, changes in environmental conditions can influence benthic populations directly (e.g. through larval advection) or indirectly, through their influence on the phytoplankton community (e.g. through the development of HABs). The South African coastline shows clear alongshore patterns of faunal biomass and species richness. On the south coast, strong longitudinal patterns of recruitment of intertidal organisms exist, with areas of particularly high recruitment. HABs of unprecedented spatio-temporal magnitude have recently developed along the south coast, including the areas where benthic recruitment is most intense. The present thesis used these blooms to study changes in intertidal recruitment directly or indirectly associated with their occurrence. Using a combination of remote sensing data to study the environmental conditions of the water mass in the innermost part of the Agulhas Bank, and estimates of mussel and barnacle recruitment rates to integrate the effects of conditions in the water mass during larval development, this thesis aimed to: (1) understand the conditions that triggered the development of an HAB of the dinoflagellate Lingulodinium polyedrum during summer of 2014, (2) determine the direct or indirect effects of that bloom on recruitment of intertidal organisms, and understand the factors that affect recruitment along the coast, (3) determine if the environmental factors during bloom development produced any carryover effects on recruit growth and mortality, and (4) determine the factors that drive changes in community biomass and composition along the south coast, the long-term trends in those factors, and possible changes experienced in recent years. Water column stability during spring, before the development of the red tide, followed by alternating periods of upwelling and relaxation during summer and autumn, seemed to promote the development and persistence of L. polyedrum. Recruitment of mussels and barnacles was estimated during the reproductive season of mussels in 2014, coinciding with the red tide, and during the following year. Alongshore patterns in recruitment were found, with higher mussel recruitment in the absence of the red tide and the opposite pattern in barnacles. Alongshore patterns in SST and chlorophyll matching those of recruitment were also found, with higher SSTs and lower chlorophyll during the red tide than the following year. Growth and mortality rates in barnacles did not differ between years during the first five months after settlement. This suggests that the factors which produced differences in recruitment between years did not produce carryover effects detectable at the temporal scales studied. Further analysis of 15 years of satellite-derived environmental data showed significant cooling trends potentially driven by a long-term seasonal acceleration of the Agulhas Current in autumn around two upwelling centres on the south coast, coinciding temporally with the reproductive period of mussels and barnacles, and spatially with the areas of highest recruitment. In addition, the comparison of SST and chl-a conditions during the first and the second half of the period of study showed that seasonality of both variables has changed in large areas over the shelf, with increasing importance of shorter-term variability, which would in turn decrease environmental predictability. Thus, the conditions observed during the present study, particularly during 2015, when upwelling seemed to be more intense, may presage the potential effects of identified long-term cooling trends at the upwelling centres. Although the general trend shows cooling around those areas, conditions can vary greatly among years, favouring different taxa. Changes in the Agulhas Current System are affected by changes in distant areas in the Indian Ocean basin. Such tele-connection is unlikely to be unique to this system and indicates the importance of understanding trends in major large scale climatic drivers and their regional effects in order to make predictions about coastal systems.
- Full Text:
- Date Issued: 2019
Large scale spatio-temporal forcing of pelagic-coastal coupling: disentangling the effects of environmental change on intertidal invertebrate recruitment
- Authors: Muñiz, Carlota Fernández
- Date: 2019
- Subjects: Dinoflagellates -- South Africa , Coastal ecology -- South Africa , Climatic changes -- South Africa , Benthic ecology -- South Africa , Agulhas Current , Ocean temperature -- Agulhas Current , Ocean temperature -- Physiological effect
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/151541 , vital:39140
- Description: Marine systems are driven by the relationships among organisms and environmental conditions. Anthropogenic-induced changes during the past decades have started to alter climatic drivers which have the potential to alter the physical, chemical and biological environment. In coastal systems, biogeography is influenced by the temporal variability in the conditions of the water mass. In addition, many marine benthic organisms develop in the water mass and rely on the conditions that link the pelagic and benthic systems for population maintenance. Such pelagic-coastal coupling indicates that changes in the trophic system during development can be transferred to the adult populations through changes in propagule supply. Thus, changes in environmental conditions can influence benthic populations directly (e.g. through larval advection) or indirectly, through their influence on the phytoplankton community (e.g. through the development of HABs). The South African coastline shows clear alongshore patterns of faunal biomass and species richness. On the south coast, strong longitudinal patterns of recruitment of intertidal organisms exist, with areas of particularly high recruitment. HABs of unprecedented spatio-temporal magnitude have recently developed along the south coast, including the areas where benthic recruitment is most intense. The present thesis used these blooms to study changes in intertidal recruitment directly or indirectly associated with their occurrence. Using a combination of remote sensing data to study the environmental conditions of the water mass in the innermost part of the Agulhas Bank, and estimates of mussel and barnacle recruitment rates to integrate the effects of conditions in the water mass during larval development, this thesis aimed to: (1) understand the conditions that triggered the development of an HAB of the dinoflagellate Lingulodinium polyedrum during summer of 2014, (2) determine the direct or indirect effects of that bloom on recruitment of intertidal organisms, and understand the factors that affect recruitment along the coast, (3) determine if the environmental factors during bloom development produced any carryover effects on recruit growth and mortality, and (4) determine the factors that drive changes in community biomass and composition along the south coast, the long-term trends in those factors, and possible changes experienced in recent years. Water column stability during spring, before the development of the red tide, followed by alternating periods of upwelling and relaxation during summer and autumn, seemed to promote the development and persistence of L. polyedrum. Recruitment of mussels and barnacles was estimated during the reproductive season of mussels in 2014, coinciding with the red tide, and during the following year. Alongshore patterns in recruitment were found, with higher mussel recruitment in the absence of the red tide and the opposite pattern in barnacles. Alongshore patterns in SST and chlorophyll matching those of recruitment were also found, with higher SSTs and lower chlorophyll during the red tide than the following year. Growth and mortality rates in barnacles did not differ between years during the first five months after settlement. This suggests that the factors which produced differences in recruitment between years did not produce carryover effects detectable at the temporal scales studied. Further analysis of 15 years of satellite-derived environmental data showed significant cooling trends potentially driven by a long-term seasonal acceleration of the Agulhas Current in autumn around two upwelling centres on the south coast, coinciding temporally with the reproductive period of mussels and barnacles, and spatially with the areas of highest recruitment. In addition, the comparison of SST and chl-a conditions during the first and the second half of the period of study showed that seasonality of both variables has changed in large areas over the shelf, with increasing importance of shorter-term variability, which would in turn decrease environmental predictability. Thus, the conditions observed during the present study, particularly during 2015, when upwelling seemed to be more intense, may presage the potential effects of identified long-term cooling trends at the upwelling centres. Although the general trend shows cooling around those areas, conditions can vary greatly among years, favouring different taxa. Changes in the Agulhas Current System are affected by changes in distant areas in the Indian Ocean basin. Such tele-connection is unlikely to be unique to this system and indicates the importance of understanding trends in major large scale climatic drivers and their regional effects in order to make predictions about coastal systems.
- Full Text:
- Date Issued: 2019
- Authors: Muñiz, Carlota Fernández
- Date: 2019
- Subjects: Dinoflagellates -- South Africa , Coastal ecology -- South Africa , Climatic changes -- South Africa , Benthic ecology -- South Africa , Agulhas Current , Ocean temperature -- Agulhas Current , Ocean temperature -- Physiological effect
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/151541 , vital:39140
- Description: Marine systems are driven by the relationships among organisms and environmental conditions. Anthropogenic-induced changes during the past decades have started to alter climatic drivers which have the potential to alter the physical, chemical and biological environment. In coastal systems, biogeography is influenced by the temporal variability in the conditions of the water mass. In addition, many marine benthic organisms develop in the water mass and rely on the conditions that link the pelagic and benthic systems for population maintenance. Such pelagic-coastal coupling indicates that changes in the trophic system during development can be transferred to the adult populations through changes in propagule supply. Thus, changes in environmental conditions can influence benthic populations directly (e.g. through larval advection) or indirectly, through their influence on the phytoplankton community (e.g. through the development of HABs). The South African coastline shows clear alongshore patterns of faunal biomass and species richness. On the south coast, strong longitudinal patterns of recruitment of intertidal organisms exist, with areas of particularly high recruitment. HABs of unprecedented spatio-temporal magnitude have recently developed along the south coast, including the areas where benthic recruitment is most intense. The present thesis used these blooms to study changes in intertidal recruitment directly or indirectly associated with their occurrence. Using a combination of remote sensing data to study the environmental conditions of the water mass in the innermost part of the Agulhas Bank, and estimates of mussel and barnacle recruitment rates to integrate the effects of conditions in the water mass during larval development, this thesis aimed to: (1) understand the conditions that triggered the development of an HAB of the dinoflagellate Lingulodinium polyedrum during summer of 2014, (2) determine the direct or indirect effects of that bloom on recruitment of intertidal organisms, and understand the factors that affect recruitment along the coast, (3) determine if the environmental factors during bloom development produced any carryover effects on recruit growth and mortality, and (4) determine the factors that drive changes in community biomass and composition along the south coast, the long-term trends in those factors, and possible changes experienced in recent years. Water column stability during spring, before the development of the red tide, followed by alternating periods of upwelling and relaxation during summer and autumn, seemed to promote the development and persistence of L. polyedrum. Recruitment of mussels and barnacles was estimated during the reproductive season of mussels in 2014, coinciding with the red tide, and during the following year. Alongshore patterns in recruitment were found, with higher mussel recruitment in the absence of the red tide and the opposite pattern in barnacles. Alongshore patterns in SST and chlorophyll matching those of recruitment were also found, with higher SSTs and lower chlorophyll during the red tide than the following year. Growth and mortality rates in barnacles did not differ between years during the first five months after settlement. This suggests that the factors which produced differences in recruitment between years did not produce carryover effects detectable at the temporal scales studied. Further analysis of 15 years of satellite-derived environmental data showed significant cooling trends potentially driven by a long-term seasonal acceleration of the Agulhas Current in autumn around two upwelling centres on the south coast, coinciding temporally with the reproductive period of mussels and barnacles, and spatially with the areas of highest recruitment. In addition, the comparison of SST and chl-a conditions during the first and the second half of the period of study showed that seasonality of both variables has changed in large areas over the shelf, with increasing importance of shorter-term variability, which would in turn decrease environmental predictability. Thus, the conditions observed during the present study, particularly during 2015, when upwelling seemed to be more intense, may presage the potential effects of identified long-term cooling trends at the upwelling centres. Although the general trend shows cooling around those areas, conditions can vary greatly among years, favouring different taxa. Changes in the Agulhas Current System are affected by changes in distant areas in the Indian Ocean basin. Such tele-connection is unlikely to be unique to this system and indicates the importance of understanding trends in major large scale climatic drivers and their regional effects in order to make predictions about coastal systems.
- Full Text:
- Date Issued: 2019
Learning to learn: a critical realist exploration into the home established learning practices of a marginalised community in Port Elizabeth
- Authors: Armstrong, Meredith
- Date: 2019
- Subjects: Minorities -- Education (Higher) -- South Africa , Readiness for school -- Social aspects -- South Africa , Inclusive education -- Social aspects -- South Africa , Marginality, Social -- South Africa , Critical realism
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/93778 , vital:30939
- Description: This study was completed as part of a project exploring social inclusion and exclusion in South African higher education. In a globalised world, the achievement of a qualification from an institution of higher education is increasingly key to finding any sort of employment. This is particularly the case in South Africa where employment amongst black citizens is inordinately high. The aim of the research reported upon in this thesis was to better understand the construct of ‘epistemological access’ (Morrow, 1992), often used in relation to the needs of black working class students entering higher education, in relation to performance data (see for example, CHE, 2016) that repeatedly shows that black students fare less well than their white peers. Following what might be termed a ‘social’ approach to understanding access, this study begins long before most students have even heard of higher education and focuses on identifying the mechanisms that come into play at much earlier level of learning and literacy development. The study outlines the development of ‘ways of being’, or social practices, surrounding learning in a marginalised community in Port Elizabeth, in the Eastern Cape, South Africa. This was achieved by means of critical ethnography and it is therefore qualitatively based. The study shows how social structures enable or constrain a child’s school readiness and how they then go on to support or impede progress in school where the language and literacy needed for educational success are further developed. The study therefore aims to allow us to explain global data indicating that the single greatest indicator of a young person’s ability to access and succeed in higher education is the level of education of caregivers in their homes of origin. Examined from a critical perspective (i.e. with a concern for social justice), this study has made use of a framework using social, psychological and linguistic theory and more, particularly, the work of sociologist Margaret Archer (1995, 1996, 2003). The study makes particular use of Archer’s ‘morphogenetic framework’ which allows for an analysis of the way structure and culture impact on a child’s development over time. As I was concerned that my own social status might impact on the understandings I developed as a critical ethnographer, the study acknowledges my own experiences of learning and the way my own family sought to enhance them as enabling. In doing this, the study aims to better contribute to understandings of social justice in South Africa.
- Full Text:
- Date Issued: 2019
- Authors: Armstrong, Meredith
- Date: 2019
- Subjects: Minorities -- Education (Higher) -- South Africa , Readiness for school -- Social aspects -- South Africa , Inclusive education -- Social aspects -- South Africa , Marginality, Social -- South Africa , Critical realism
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/93778 , vital:30939
- Description: This study was completed as part of a project exploring social inclusion and exclusion in South African higher education. In a globalised world, the achievement of a qualification from an institution of higher education is increasingly key to finding any sort of employment. This is particularly the case in South Africa where employment amongst black citizens is inordinately high. The aim of the research reported upon in this thesis was to better understand the construct of ‘epistemological access’ (Morrow, 1992), often used in relation to the needs of black working class students entering higher education, in relation to performance data (see for example, CHE, 2016) that repeatedly shows that black students fare less well than their white peers. Following what might be termed a ‘social’ approach to understanding access, this study begins long before most students have even heard of higher education and focuses on identifying the mechanisms that come into play at much earlier level of learning and literacy development. The study outlines the development of ‘ways of being’, or social practices, surrounding learning in a marginalised community in Port Elizabeth, in the Eastern Cape, South Africa. This was achieved by means of critical ethnography and it is therefore qualitatively based. The study shows how social structures enable or constrain a child’s school readiness and how they then go on to support or impede progress in school where the language and literacy needed for educational success are further developed. The study therefore aims to allow us to explain global data indicating that the single greatest indicator of a young person’s ability to access and succeed in higher education is the level of education of caregivers in their homes of origin. Examined from a critical perspective (i.e. with a concern for social justice), this study has made use of a framework using social, psychological and linguistic theory and more, particularly, the work of sociologist Margaret Archer (1995, 1996, 2003). The study makes particular use of Archer’s ‘morphogenetic framework’ which allows for an analysis of the way structure and culture impact on a child’s development over time. As I was concerned that my own social status might impact on the understandings I developed as a critical ethnographer, the study acknowledges my own experiences of learning and the way my own family sought to enhance them as enabling. In doing this, the study aims to better contribute to understandings of social justice in South Africa.
- Full Text:
- Date Issued: 2019
Lending technologies and small, micro and medium enterprise borrowing: evidence from the Eastern Cape province of South
- Authors: Mbedzi, Edson
- Date: 2019
- Subjects: Financial services industry -- Information technology Banks and banking -- Information technology Small business -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Economics)
- Identifier: http://hdl.handle.net/10353/12621 , vital:39293
- Description: Small, Micro and Medium Enterprises (SMMEs) play a major role in contributing to the development of most economies globally. However, such small firms often lack external financing due to their information opacity. Besides, the small firm size nature of most SMMEs impairs their ability to access finance as motivated by the market power theory. In order to address the information asymmetry problem associated with such small firms, financial institutions use different forms of lending technologies as the basis upon which lending decisions are made, that is, whether to loan or not and if the decision to lend is taken, how the intrinsic credit risks are taken into consideration. In the evaluation of the credit worthiness of small businesses, the decision to lend or not depends on soft or hard information acquired through use of a particular lending technology. Many studies in the literature cite access to credit as the main hindrance to SMMEs success. Lending technologies being the conduits transmitting that credit access, the study hypothesises that more emphasis be placed on the relationship between lending technologies and the success of small firms. Success in this case is measured in two ways; the level of SMME credit rationing that small firms endure and the resultant growth of small businesses if they access funding. However, the use of lending technologies as a measure of SMME finance access is missing in academic literature. Specifically, literature on SMMEs in South Africa only narrate the structure of SMMEs and factors affecting SMMEs funding and growth without providing a link on how these eventually influence lending technologies used that determine the lending process. This study therefore traces types of lending technologies used, factors influencing their usage and the subsequent level of credit rationing and growth of small firms. The study uses only formal and registered small firms that are members of the Border-Kei Chamber of Business and Nelson Mandela Bay Business Chamber and listed in their data bases. The study adopts a mixed methods methodology in a two stage analysis approach. In the first stage, the study identifies types of lending technologies used by funding institutions in the study area and factors lenders take into account in order to extend funding to small vi businesses. Based on interview data gathered from eight financial institutions, the types of lending technologies and factors that influence lending decisions are identified using thematic analysis method. In the second stage, the study then interrogates how lending technologies shape the credit rationing and growth of SMMEs within the Eastern Cape Province in South Africa. A sample of three hundred and twenty one (321) randomly selected SMMEs from Buffalo City and Nelson Mandela Bay metropolitans in the Eastern Cape Province is used. Data collected from SMMEs using questionnaires has been analysed to reveal the extent of credit rationing and firm growth variations among SMMEs based on the main lender and firm characteristics identified in the first stage. Credit rationing is both dichotomous, by the firm being either rationed or not, and categorical, by forms of credit rationing experienced by firms. The analysis therefore uses a combination of binary and multinomial logistic regression to evaluate effects of determinants of lending technologies on credit rationing of firms. Financial efficiency scores of firms are used as the proxy for growth of firms. The financial efficiency score is preferred because in its derivation several firm activities are incorporated as opposed to using only one growth indicator such as sales volume. The efficiency scores are generated using Data Enveloping Analysis based on selected main activity inputs and outputs of sampled firms. Since efficiency scores of a firm representing growth are a scale dependent variable, a two-way factorial analysis is used to determine the effect of lender and firm characteristics on the firm’s growth. Both the main and interaction effects of the lender and firm characteristics are captured in the analysis of both credit rationing and growth of firms. Results show that four classes of financial institutions financed formal and registered SMMEs. These are commercial banks, government-owned development financial institutions, private-owned development financial institutions and microfinance institutions. In addition, four types of lending technologies have been used to finance SMMEs in which financial institutions consider people, firm and financial information vii factors as pillars of financing decisions. Findings indicate extensive discriminatory credit rationing among SMMEs in South Africa and that growth paths followed by firms vary significantly as a result of these characteristics. The study therefore recommends the implementation of a financing framework model that allocates funds to different company structures based on credit rationing risk profiles of enterprises so as to minimize the extent of inequality exhibited in the South African population structures which have historical differences on the basis of enterprise size, ownership structure and race. The study further recommends matching of types of lending technologies with types of lenders in order to minimize overall industry credit rationing level in the SMME sector as a supplementary funding model. However, this may need further research to evaluate its application. This is important given that financial institutions use different lending technologies at the same time and further, not all financing institutions may use all forms of lending technologies. For example, microfinance institutions may not have the capacity to use venture capital lending technologies
- Full Text:
- Date Issued: 2019
- Authors: Mbedzi, Edson
- Date: 2019
- Subjects: Financial services industry -- Information technology Banks and banking -- Information technology Small business -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Economics)
- Identifier: http://hdl.handle.net/10353/12621 , vital:39293
- Description: Small, Micro and Medium Enterprises (SMMEs) play a major role in contributing to the development of most economies globally. However, such small firms often lack external financing due to their information opacity. Besides, the small firm size nature of most SMMEs impairs their ability to access finance as motivated by the market power theory. In order to address the information asymmetry problem associated with such small firms, financial institutions use different forms of lending technologies as the basis upon which lending decisions are made, that is, whether to loan or not and if the decision to lend is taken, how the intrinsic credit risks are taken into consideration. In the evaluation of the credit worthiness of small businesses, the decision to lend or not depends on soft or hard information acquired through use of a particular lending technology. Many studies in the literature cite access to credit as the main hindrance to SMMEs success. Lending technologies being the conduits transmitting that credit access, the study hypothesises that more emphasis be placed on the relationship between lending technologies and the success of small firms. Success in this case is measured in two ways; the level of SMME credit rationing that small firms endure and the resultant growth of small businesses if they access funding. However, the use of lending technologies as a measure of SMME finance access is missing in academic literature. Specifically, literature on SMMEs in South Africa only narrate the structure of SMMEs and factors affecting SMMEs funding and growth without providing a link on how these eventually influence lending technologies used that determine the lending process. This study therefore traces types of lending technologies used, factors influencing their usage and the subsequent level of credit rationing and growth of small firms. The study uses only formal and registered small firms that are members of the Border-Kei Chamber of Business and Nelson Mandela Bay Business Chamber and listed in their data bases. The study adopts a mixed methods methodology in a two stage analysis approach. In the first stage, the study identifies types of lending technologies used by funding institutions in the study area and factors lenders take into account in order to extend funding to small vi businesses. Based on interview data gathered from eight financial institutions, the types of lending technologies and factors that influence lending decisions are identified using thematic analysis method. In the second stage, the study then interrogates how lending technologies shape the credit rationing and growth of SMMEs within the Eastern Cape Province in South Africa. A sample of three hundred and twenty one (321) randomly selected SMMEs from Buffalo City and Nelson Mandela Bay metropolitans in the Eastern Cape Province is used. Data collected from SMMEs using questionnaires has been analysed to reveal the extent of credit rationing and firm growth variations among SMMEs based on the main lender and firm characteristics identified in the first stage. Credit rationing is both dichotomous, by the firm being either rationed or not, and categorical, by forms of credit rationing experienced by firms. The analysis therefore uses a combination of binary and multinomial logistic regression to evaluate effects of determinants of lending technologies on credit rationing of firms. Financial efficiency scores of firms are used as the proxy for growth of firms. The financial efficiency score is preferred because in its derivation several firm activities are incorporated as opposed to using only one growth indicator such as sales volume. The efficiency scores are generated using Data Enveloping Analysis based on selected main activity inputs and outputs of sampled firms. Since efficiency scores of a firm representing growth are a scale dependent variable, a two-way factorial analysis is used to determine the effect of lender and firm characteristics on the firm’s growth. Both the main and interaction effects of the lender and firm characteristics are captured in the analysis of both credit rationing and growth of firms. Results show that four classes of financial institutions financed formal and registered SMMEs. These are commercial banks, government-owned development financial institutions, private-owned development financial institutions and microfinance institutions. In addition, four types of lending technologies have been used to finance SMMEs in which financial institutions consider people, firm and financial information vii factors as pillars of financing decisions. Findings indicate extensive discriminatory credit rationing among SMMEs in South Africa and that growth paths followed by firms vary significantly as a result of these characteristics. The study therefore recommends the implementation of a financing framework model that allocates funds to different company structures based on credit rationing risk profiles of enterprises so as to minimize the extent of inequality exhibited in the South African population structures which have historical differences on the basis of enterprise size, ownership structure and race. The study further recommends matching of types of lending technologies with types of lenders in order to minimize overall industry credit rationing level in the SMME sector as a supplementary funding model. However, this may need further research to evaluate its application. This is important given that financial institutions use different lending technologies at the same time and further, not all financing institutions may use all forms of lending technologies. For example, microfinance institutions may not have the capacity to use venture capital lending technologies
- Full Text:
- Date Issued: 2019
Listening to silenced voices: The lived experiences of Xhosa mothers during the initiation period of their sons
- Authors: Makupula, Mahlodi
- Date: 2019
- Subjects: Ethnocentrism Circumcision
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15815 , vital:40529
- Description: The aim of this study was to explore and describe the lived experiences of Xhosa mothers during the initiation period of their sons. The male rite of initiation among the amaXhosa has various taboos that prohibit women from getting involved in decision-making regarding the ritual. This creates a challenge as the number of female-headed households are increasing. The rationale for this study was to give Xhosa mothers a voice to relate their narratives of how they experienced the initiation period of their sons. In order to carry out this aim, the paradigm of Afrocentricity was used to anchor the study. Afrocentricity is a paradigm that supports the agency of African people in a study conducted about their issues. It also aims to give the previously oppressed groups a voice so that they can speak for themselves. Interpretative Phenomenological Analysis (IPA) as set out by Jonathan Smith was used as a qualitative research methodology in this study. Data was generated, recorded and transcribed from semi-structured interviews with eight selected participants. The biological mothers of Xhosa initiates, that experienced the initiation of their sons, took part in this study. The over-arching inclusion criteria were that the mothers gave permission for their sons to be initiated, and that their sons did not experience any major complications during the ritual. They met the inclusion criteria as set out by the researcher. The findings of the study indicated that the mothers’ experiences were multifaceted. They included the spiritual, psychological and emotional experiences, as well as their experiences as women, and, more especially, as mothers. The challenges that mothers faced during this period included lack of feedback regarding the health of their sons. This led to the experiencing of somatic symptoms like lack of sleep, poor appetite, and anxiety. In order to deal with their symptoms, the main coping mechanism that the participants used, was prayer. LISTENING TO SILENCED VOICES ii This study has highlighted the importance of listening to previously silenced voices in order to contribute to local knowledge. It is envisaged that the findings of this study will contribute to policy decisions that affect women, by ensuring the involvement of women in higher decision-making bodies. This is particularly important with the high number of femaleheaded households in the country.
- Full Text:
- Date Issued: 2019
- Authors: Makupula, Mahlodi
- Date: 2019
- Subjects: Ethnocentrism Circumcision
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15815 , vital:40529
- Description: The aim of this study was to explore and describe the lived experiences of Xhosa mothers during the initiation period of their sons. The male rite of initiation among the amaXhosa has various taboos that prohibit women from getting involved in decision-making regarding the ritual. This creates a challenge as the number of female-headed households are increasing. The rationale for this study was to give Xhosa mothers a voice to relate their narratives of how they experienced the initiation period of their sons. In order to carry out this aim, the paradigm of Afrocentricity was used to anchor the study. Afrocentricity is a paradigm that supports the agency of African people in a study conducted about their issues. It also aims to give the previously oppressed groups a voice so that they can speak for themselves. Interpretative Phenomenological Analysis (IPA) as set out by Jonathan Smith was used as a qualitative research methodology in this study. Data was generated, recorded and transcribed from semi-structured interviews with eight selected participants. The biological mothers of Xhosa initiates, that experienced the initiation of their sons, took part in this study. The over-arching inclusion criteria were that the mothers gave permission for their sons to be initiated, and that their sons did not experience any major complications during the ritual. They met the inclusion criteria as set out by the researcher. The findings of the study indicated that the mothers’ experiences were multifaceted. They included the spiritual, psychological and emotional experiences, as well as their experiences as women, and, more especially, as mothers. The challenges that mothers faced during this period included lack of feedback regarding the health of their sons. This led to the experiencing of somatic symptoms like lack of sleep, poor appetite, and anxiety. In order to deal with their symptoms, the main coping mechanism that the participants used, was prayer. LISTENING TO SILENCED VOICES ii This study has highlighted the importance of listening to previously silenced voices in order to contribute to local knowledge. It is envisaged that the findings of this study will contribute to policy decisions that affect women, by ensuring the involvement of women in higher decision-making bodies. This is particularly important with the high number of femaleheaded households in the country.
- Full Text:
- Date Issued: 2019
Livestock water productivity: towards improving rural livelihoods from livestock in semi-arid rangelands
- Authors: Gusha, Bukho
- Date: 2019
- Subjects: Livestock -- South Africa -- Eastern Cape , Livestock -- Effect of drought on -- South Africa -- Eastern Cape , Animals -- Food -- South Africa -- Eastern Cape , Livestock -- Effect of water quality on -- South Africa -- Eastern Cape , Livestock -- Water requirements -- South Africa -- Eastern Cape , Livestock productivity -- South Africa -- Eastern Cape , Stochastic analysis , Communal rangelands -- South Africa -- Eastern Cape , Land degradation -- South Africa -- Eastern Cape , Animal owners -- South Africa -- Eastern Cape , Livestock improvement -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/115171 , vital:34084
- Description: Communal rangelands in South Africa mainly occur in the former homelands. The former homelands constitute 13% of the land surface area and support a quarter of the country's human population with a wide range of goods and services, among them, grazing for livestock, mostly reared on communal rangelands. These rangelands are degraded and cannot sustain maximum livestock production because of poor species composition and low standing biomass, however research has been conducted on livestock production at household level (where all livestock goods and services are valued). This provides an opportunity to conduct a study describing livestock water productivity in the north of the Eastern Cape, where livestock production is a primary source of livelihood for rural communities from which many households generate cash but where different practices and factors undermine high livestock production. Many studies have focused on understanding the water productivity of a natural rangeland system for commercially oriented crop-livestock systems, but the aim of this study is to contribute towards improving rural livelihoods from livestock in the sub-humid rangelands of the north Eastern Cape. Here, unimproved native grasslands are the major source of feed for livestock and people do not have herders to take livestock to the most productive parts of the rangelands. Households were surveyed using a questionnaire on livestock household contribution, socioeconomic characteristics of the household, livestock holdings and livestock production strategies. Rangeland productivity was measured in the field. Experimental animals for livestock grazing distribution were identified and fitted with Global Positioning Systems (GPS) collars to identify the seasonal grazing areas. These activities shed light on the biophysical attributes of the ecosystem and livestock production in a communal rangeland system. Because continuous grazing in the rangelands of the north Eastern Cape reduces the standing biomass, there is no obvious aboveground biomass to provide a visual perspective of production nor is it possible to determine production without excluding the livestock. Thus, four parallel lines of evidence were employed to measure rangeland productivity: line intercept, grazing exclosures, net photosynthesis from earth observation and disc pasture meter. Earth observation products were used to derive the amount of water used by the landscape to produce this forage (i.e. evapotranspiration or ET) and these measurements of net primary production and landscape water use were used in preparing a value of livestock water productivity (LWP) for this farming system. There has been the perception that residents of the study area lack knowledge of technical efficiencies in the large stock sector at household level. The study used stochastic frontier analysis to assess livestock production and followed with a household survey to collect information on socio-economic characteristics and information on livestock practices. The data from the household survey were used to estimate the technical efficiency of households using a stochastic frontier analysis. Productivity and inefficiency variables that increase livestock production or increase technical difficulties were identified. The focus on livestock has mostly been on the direct value of livestock to owners with a poor understanding of their value to non-livestock owners, where cultural activities, such as livestock slaughtering, were documented as the only source of protein for non-livestock owners. However, the value that is available to non-livestock owners has not been quantified. This study assessed livestockbased livelihoods of communal people to improve their livelihoods through a household survey looking at the contribution of livestock to both livestock and non-livestock owners. Earlier work on LWP has focused on systems where animals were on ‘fed, cut and carry’ and irrigated systems. However, there is a need to describe LWP in a natural grazing system and this study set out to achieve this for these communal rangelands through a household survey that determined the value of livestock goods and services given the amount of water used (ET). Lastly, livestock grazing distribution across the landscape was assessed, using GPS collars that recorded livestock behaviour every five minutes during the daylight. This approach was necessary because livestock grazing patterns in these communal rangelands is poorly controlled by people, and animals are largely free-ranging, grazing selectively, based on their own preferences, which leads to localised overgrazing. This part of the study was achieved through experimental livestock collaring and weighing (both sheep and goats) for the wet and dry seasons. The collared livestock were weighed on the day of putting on collars and the day of removing the collars. The results on livestock grazing distribution were analysed using the R package, T-LoCoH. The major finding of this study was that communal rangelands of the north Eastern Cape can improve rural livelihoods from livestock if proper interventions for both livestock and rangeland production and productivity can be implemented. One of these interventions is fencing as it was found that exclosures that were fenced during the study yielded high aboveground productivity comparable to that achieved in commercial rangelands, yielding 220 g DM m-2 yr-1. Surveys using the calibrated disc pasture meter showed the need for proper rotation and resting of the rangeland. Net photosynthesis of 880.7 g C m-2 yr-1 for unimproved grassland in good condition was comparable to commercial rangelands in the region. Using the line intercept, vegetation cover was found to be a good predictor of aboveground standing biomass; thus a positive relationship was revealed. Lastly, annual ET of 270 mm yr-1 was calculated using the Penman Monteith Palmer (PMP) equation, while 379 mm yr-1 was extracted from the MOD16 product, suggesting that PMP ET may not be accurate in these grassland systems due to the slow response of MODIS Leaf Area Index (LAI). The average household technical efficiency (TE) score was found to be 0.79 on the study sites, indicating the potential for households to improve outputs from livestock. A range of household categories were identified, based on gender and an index of wealth, and households with lower and higher TE were identified. This analysis revealed that productivity variables such as holding higher livestock numbers and providing additional feed achieved high livestock outputs, suggesting high livestock productivity. However, in terms of inefficiency variables, gender (female-headed households), dwelling type (an index of homestead wealth), kraaling livestock at night and herding livestock during the day were found to improve technical efficiency. It was revealed in this study that households keep livestock to derive different goods and services including offtake, manure, milk, wool and services such as traction. The non-livestock owning households were reported to also benefit from the abovementioned goods and services in the study site and that the value of their contribution could be quantified, thus contributing significantly to rural livelihoods. The study showed that LWP was comparable with other studies such as those conducted in Ethiopia. This study compared its results with the studies conducted outside South Africa as there were limited comparable South African studies available; however, this does not necessarily mean we can use the same model as the value of livestock outputs varies based on the preferred outputs. This study developed an LWP model for the natural rangeland system. The LWP values were measured in ZAR and later converted in USD and were divided into three different categories based on the wealth index, such as better-off, middle wealth and poor households. Lastly, this study showed that livestock (both cattle and sheep) spend a high proportion of their grazing day, during both the wet and dry seasons, in a small physical area, immediately around the homesteads. These are areas where the active green growth occurs throughout the year, suggesting the need for livestock herders to move livestock around the landscape for more effective landscape use. Herding has the potential to improve landscape use and conserve grazing resource and the ability of a household to attain best outputs from livestock. Positive daily weight gains were reported in collared livestock during the wet season. However, both sheep and cattle lost weight during the dry season. This study recommends interventions such as labour for herding, and other animal husbandry-related activities including milking, handling, and vaccinating animals. Market opportunities for communal rangeland livestock should be facilitated by informing livestock owners about livestock market specifications to improve their livelihoods. Lastly, proper grazing management planning, such as fencing, which enables rotational grazing, and herding which moves animals to the most productive parts of the rangeland, should be implemented so that rangelands can be rested for plant growth, vigour, and improved aboveground net primary productivity. Based on the recommendations made in this study, a research development approach is necessary which prioritises female empowerment in agriculture and poor farmers as female-headed households were reported by this study to be more technically efficient.
- Full Text:
- Date Issued: 2019
- Authors: Gusha, Bukho
- Date: 2019
- Subjects: Livestock -- South Africa -- Eastern Cape , Livestock -- Effect of drought on -- South Africa -- Eastern Cape , Animals -- Food -- South Africa -- Eastern Cape , Livestock -- Effect of water quality on -- South Africa -- Eastern Cape , Livestock -- Water requirements -- South Africa -- Eastern Cape , Livestock productivity -- South Africa -- Eastern Cape , Stochastic analysis , Communal rangelands -- South Africa -- Eastern Cape , Land degradation -- South Africa -- Eastern Cape , Animal owners -- South Africa -- Eastern Cape , Livestock improvement -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/115171 , vital:34084
- Description: Communal rangelands in South Africa mainly occur in the former homelands. The former homelands constitute 13% of the land surface area and support a quarter of the country's human population with a wide range of goods and services, among them, grazing for livestock, mostly reared on communal rangelands. These rangelands are degraded and cannot sustain maximum livestock production because of poor species composition and low standing biomass, however research has been conducted on livestock production at household level (where all livestock goods and services are valued). This provides an opportunity to conduct a study describing livestock water productivity in the north of the Eastern Cape, where livestock production is a primary source of livelihood for rural communities from which many households generate cash but where different practices and factors undermine high livestock production. Many studies have focused on understanding the water productivity of a natural rangeland system for commercially oriented crop-livestock systems, but the aim of this study is to contribute towards improving rural livelihoods from livestock in the sub-humid rangelands of the north Eastern Cape. Here, unimproved native grasslands are the major source of feed for livestock and people do not have herders to take livestock to the most productive parts of the rangelands. Households were surveyed using a questionnaire on livestock household contribution, socioeconomic characteristics of the household, livestock holdings and livestock production strategies. Rangeland productivity was measured in the field. Experimental animals for livestock grazing distribution were identified and fitted with Global Positioning Systems (GPS) collars to identify the seasonal grazing areas. These activities shed light on the biophysical attributes of the ecosystem and livestock production in a communal rangeland system. Because continuous grazing in the rangelands of the north Eastern Cape reduces the standing biomass, there is no obvious aboveground biomass to provide a visual perspective of production nor is it possible to determine production without excluding the livestock. Thus, four parallel lines of evidence were employed to measure rangeland productivity: line intercept, grazing exclosures, net photosynthesis from earth observation and disc pasture meter. Earth observation products were used to derive the amount of water used by the landscape to produce this forage (i.e. evapotranspiration or ET) and these measurements of net primary production and landscape water use were used in preparing a value of livestock water productivity (LWP) for this farming system. There has been the perception that residents of the study area lack knowledge of technical efficiencies in the large stock sector at household level. The study used stochastic frontier analysis to assess livestock production and followed with a household survey to collect information on socio-economic characteristics and information on livestock practices. The data from the household survey were used to estimate the technical efficiency of households using a stochastic frontier analysis. Productivity and inefficiency variables that increase livestock production or increase technical difficulties were identified. The focus on livestock has mostly been on the direct value of livestock to owners with a poor understanding of their value to non-livestock owners, where cultural activities, such as livestock slaughtering, were documented as the only source of protein for non-livestock owners. However, the value that is available to non-livestock owners has not been quantified. This study assessed livestockbased livelihoods of communal people to improve their livelihoods through a household survey looking at the contribution of livestock to both livestock and non-livestock owners. Earlier work on LWP has focused on systems where animals were on ‘fed, cut and carry’ and irrigated systems. However, there is a need to describe LWP in a natural grazing system and this study set out to achieve this for these communal rangelands through a household survey that determined the value of livestock goods and services given the amount of water used (ET). Lastly, livestock grazing distribution across the landscape was assessed, using GPS collars that recorded livestock behaviour every five minutes during the daylight. This approach was necessary because livestock grazing patterns in these communal rangelands is poorly controlled by people, and animals are largely free-ranging, grazing selectively, based on their own preferences, which leads to localised overgrazing. This part of the study was achieved through experimental livestock collaring and weighing (both sheep and goats) for the wet and dry seasons. The collared livestock were weighed on the day of putting on collars and the day of removing the collars. The results on livestock grazing distribution were analysed using the R package, T-LoCoH. The major finding of this study was that communal rangelands of the north Eastern Cape can improve rural livelihoods from livestock if proper interventions for both livestock and rangeland production and productivity can be implemented. One of these interventions is fencing as it was found that exclosures that were fenced during the study yielded high aboveground productivity comparable to that achieved in commercial rangelands, yielding 220 g DM m-2 yr-1. Surveys using the calibrated disc pasture meter showed the need for proper rotation and resting of the rangeland. Net photosynthesis of 880.7 g C m-2 yr-1 for unimproved grassland in good condition was comparable to commercial rangelands in the region. Using the line intercept, vegetation cover was found to be a good predictor of aboveground standing biomass; thus a positive relationship was revealed. Lastly, annual ET of 270 mm yr-1 was calculated using the Penman Monteith Palmer (PMP) equation, while 379 mm yr-1 was extracted from the MOD16 product, suggesting that PMP ET may not be accurate in these grassland systems due to the slow response of MODIS Leaf Area Index (LAI). The average household technical efficiency (TE) score was found to be 0.79 on the study sites, indicating the potential for households to improve outputs from livestock. A range of household categories were identified, based on gender and an index of wealth, and households with lower and higher TE were identified. This analysis revealed that productivity variables such as holding higher livestock numbers and providing additional feed achieved high livestock outputs, suggesting high livestock productivity. However, in terms of inefficiency variables, gender (female-headed households), dwelling type (an index of homestead wealth), kraaling livestock at night and herding livestock during the day were found to improve technical efficiency. It was revealed in this study that households keep livestock to derive different goods and services including offtake, manure, milk, wool and services such as traction. The non-livestock owning households were reported to also benefit from the abovementioned goods and services in the study site and that the value of their contribution could be quantified, thus contributing significantly to rural livelihoods. The study showed that LWP was comparable with other studies such as those conducted in Ethiopia. This study compared its results with the studies conducted outside South Africa as there were limited comparable South African studies available; however, this does not necessarily mean we can use the same model as the value of livestock outputs varies based on the preferred outputs. This study developed an LWP model for the natural rangeland system. The LWP values were measured in ZAR and later converted in USD and were divided into three different categories based on the wealth index, such as better-off, middle wealth and poor households. Lastly, this study showed that livestock (both cattle and sheep) spend a high proportion of their grazing day, during both the wet and dry seasons, in a small physical area, immediately around the homesteads. These are areas where the active green growth occurs throughout the year, suggesting the need for livestock herders to move livestock around the landscape for more effective landscape use. Herding has the potential to improve landscape use and conserve grazing resource and the ability of a household to attain best outputs from livestock. Positive daily weight gains were reported in collared livestock during the wet season. However, both sheep and cattle lost weight during the dry season. This study recommends interventions such as labour for herding, and other animal husbandry-related activities including milking, handling, and vaccinating animals. Market opportunities for communal rangeland livestock should be facilitated by informing livestock owners about livestock market specifications to improve their livelihoods. Lastly, proper grazing management planning, such as fencing, which enables rotational grazing, and herding which moves animals to the most productive parts of the rangeland, should be implemented so that rangelands can be rested for plant growth, vigour, and improved aboveground net primary productivity. Based on the recommendations made in this study, a research development approach is necessary which prioritises female empowerment in agriculture and poor farmers as female-headed households were reported by this study to be more technically efficient.
- Full Text:
- Date Issued: 2019
Local web news as tools for framing food security: the content analysis of four selected Eastern Cape web newspapers
- Metula , Nolukhanyo Theorida
- Authors: Metula , Nolukhanyo Theorida
- Date: 2019
- Subjects: Food security World Wide Web
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/17484 , vital:41080
- Description: This study evaluates how the Eastern Cape local web newspapers frame food security in the Eastern Cape Province. A qualitative content analysis by means of textual analysis was used to evaluate the selected local web newspaper’s content on food security related stories within the period of July-December 2017. The sample was drawn from four Eastern Cape local web newspapers- Daily Dispatch Live, Herald Live, Go and Express and The Talk of the Town. The analysis sought to determine how the selected local web newspapers frame food security concerning food availability, accessibility and affordability in the Eastern Cape Province. Additionally, the study aimed to ascertain the issues about food security that are raised by the Eastern Cape local web newspapers and, to establish the extent to which these Eastern Cape local web newspapers’ framing is helpful in ensuring participation, empowerment and community mobilization for food securing purposes. The results of this study indicate that the local web newspapers frame Eastern Cape Province as untapped food basket. The framing suggests that the Province can leverage its agricultural resources for job creation which will ensure economic growth and food security. The local web newspapers framing suggests that there are numerous channels such as natural food production, livestock production, smallholder farming that can enhance availability and access to affordable food to people in the Eastern Cape Province. The findings revealed that local web newspapers frame increased agricultural production as an important issue that demand serious and urgent attention of the Provincial government as it has the potential of not only ensuring food security but also impacting positively on the income of local farmers. The local web newspapers frame farm attacks, land redistribution and reinstatement as important factors that hinder food production and, ultimately, food security in the Eastern Cape v Province. Furthermore, this study discovered that the frame of references used by the local web newspapers, especially the emphasis on local farming, land redistribution and private sector help to empower and mobilize individuals and communities to participate in food security initiatives. This study concludes that Eastern Cape Local Web Newspapers can be veritable tools to enhance food security channels in the Eastern Cape Province
- Full Text:
- Date Issued: 2019
- Authors: Metula , Nolukhanyo Theorida
- Date: 2019
- Subjects: Food security World Wide Web
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/17484 , vital:41080
- Description: This study evaluates how the Eastern Cape local web newspapers frame food security in the Eastern Cape Province. A qualitative content analysis by means of textual analysis was used to evaluate the selected local web newspaper’s content on food security related stories within the period of July-December 2017. The sample was drawn from four Eastern Cape local web newspapers- Daily Dispatch Live, Herald Live, Go and Express and The Talk of the Town. The analysis sought to determine how the selected local web newspapers frame food security concerning food availability, accessibility and affordability in the Eastern Cape Province. Additionally, the study aimed to ascertain the issues about food security that are raised by the Eastern Cape local web newspapers and, to establish the extent to which these Eastern Cape local web newspapers’ framing is helpful in ensuring participation, empowerment and community mobilization for food securing purposes. The results of this study indicate that the local web newspapers frame Eastern Cape Province as untapped food basket. The framing suggests that the Province can leverage its agricultural resources for job creation which will ensure economic growth and food security. The local web newspapers framing suggests that there are numerous channels such as natural food production, livestock production, smallholder farming that can enhance availability and access to affordable food to people in the Eastern Cape Province. The findings revealed that local web newspapers frame increased agricultural production as an important issue that demand serious and urgent attention of the Provincial government as it has the potential of not only ensuring food security but also impacting positively on the income of local farmers. The local web newspapers frame farm attacks, land redistribution and reinstatement as important factors that hinder food production and, ultimately, food security in the Eastern Cape v Province. Furthermore, this study discovered that the frame of references used by the local web newspapers, especially the emphasis on local farming, land redistribution and private sector help to empower and mobilize individuals and communities to participate in food security initiatives. This study concludes that Eastern Cape Local Web Newspapers can be veritable tools to enhance food security channels in the Eastern Cape Province
- Full Text:
- Date Issued: 2019
L’entre-deux identitaire dans quelques oeuvres d’écrivains francophones “immigrantsˮ, “cas de Dany Laferrière, d’Alain Mabanckou, de Calixthe Beyala et de Lottin Wekapeˮ
- Kayumba, Viviane Ngoie Banza
- Authors: Kayumba, Viviane Ngoie Banza
- Date: 2019
- Subjects: African literature (French) -- History and criticism , Immigrants in literature , Mabanckou, Alain, 1966-. Black bazaar , Laferrière, Dany. Je suis un écrivain japonais , Beyala, Calixthe. Le Petit prince de Belleville , Wekape, Lottin, 1968-. J’appartiens au monde
- Language: French
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/150929 , vital:39018
- Description: This dissertation examines the theme of hybrid identities in Mabanckou, Laferrière, Beyala and Wekape’s novels : Black Bazar, Le Petit prince de Belleville, Je suis un écrivain japonais and J’appartiens au monde. Hybrid identity raises the issue of identity diversity and contemporary francophone literature is characterised by the emergence of fictional narratives increasingly numerous. This research undertaken is driven by the desire to extend the field of investigation in francophone literature by taking into account a varied corpus of Haitian, Congolese, and Cameroonian literatures. I have opted for writers who settled in a foreign country and have adopted a foreign language that they considered to be part of a foreign literary world; writers who are between two or more cultures which they depict in French. The few existing studies on hybrid identities on these four novels focused more on formal and linguistic analysis and omitted meaningful sociocritic analysis. It is clear that a full study on sociocritic approach on hybrid identity on these four authors remains to be done. The research is demonstrating how different characters created by these four postmodern immigrant French-speaking writers occasionally function similarly in their texts. This gives a clear understanding of the specific behaviour of immigrants characters, vis-à-vis their various situations in the novels, and how these immigrants seek to address the problems they encounter. As this research offers reflections related to the identities and nationalities of immigrants, Laferrière, Mabanckou, Beyala and Wekape’s texts are based on the search for social belonging and a literary membership in this modern world. Therefore, they are analysing their position in a literary field as well as in a social field. In their texts they highlight the Space real or imaginary. In which way and how this Space contribute to the evolution of francophone literature? To what extent does francophone literature takes into account this representation of the Space? These questions lead to a reflection on the position occupied by these authors in the francophone field and the source of their literary inspirations. My interest in these authors is motivated by the fact that, by living and writing in a country which is not their place of birth, they each reveal different aspects of hybrid identity. Each of them, has his or her personal and original way of tackling the problem of mixed identity. They present their characters in different situations and different contexts, showing that each has been in contact with several cultures which they have assimilated and each lived in his or her own way a particular story. My study’s focus is to understand the problems of contact of cultures and their consequences, and to explore how through the characters of the novel, immigrant French speaking writers understood their acculturation as themselves have experienced an identity crisis, resulting from the confrontation of the culture of their new homeland and the culture of their country of origin. For this reason, Bourdieu’s approach “la sociocritique” will help me to found out the origin of the author’s obsession with the question of hybrid identity. I have chosen these four immigrant speaking writers to explore the strategies implemented by the novels’ narrators to construct their identities and to find out how the narrators express the intentions of the authors. In their texts, Mabanckou, Beyala, Laferrière and Wekape have used various strategies to express the quest for identity which gives clear indications of the authors’ creativity such as humour, parody, or solemnity and gravity - and the narrative voices reveal distinctive attitudes in relation to hybrid identity. At this level, other approaches will also be called for, such as the work of Westphal, Doubrovsky, Genette, Colona, etc. Through my investigation, these works present similarities and dissimilarities. Each author tackled the questions of hybrid identities according to his own experience. From there, a different commitment emerges, depending on the degree of inquiry into questions about immigration. These authors all evoke the social precariousness of their characters or the immigrant and privilege an urban framework. The examination of these works allowed me to identify their place in Francophonie literature and to discover the importance of their texts. The four novels relate to the search for identity, an aesthetic way and a search for freedom. They possess aesthetic qualities, they have a high degree of coherence. Their romantic choice shows their creativity and their strategies engender a hybrid writing that stems from their position between several languages and place these novels within the world literature.
- Full Text:
- Date Issued: 2019
- Authors: Kayumba, Viviane Ngoie Banza
- Date: 2019
- Subjects: African literature (French) -- History and criticism , Immigrants in literature , Mabanckou, Alain, 1966-. Black bazaar , Laferrière, Dany. Je suis un écrivain japonais , Beyala, Calixthe. Le Petit prince de Belleville , Wekape, Lottin, 1968-. J’appartiens au monde
- Language: French
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/150929 , vital:39018
- Description: This dissertation examines the theme of hybrid identities in Mabanckou, Laferrière, Beyala and Wekape’s novels : Black Bazar, Le Petit prince de Belleville, Je suis un écrivain japonais and J’appartiens au monde. Hybrid identity raises the issue of identity diversity and contemporary francophone literature is characterised by the emergence of fictional narratives increasingly numerous. This research undertaken is driven by the desire to extend the field of investigation in francophone literature by taking into account a varied corpus of Haitian, Congolese, and Cameroonian literatures. I have opted for writers who settled in a foreign country and have adopted a foreign language that they considered to be part of a foreign literary world; writers who are between two or more cultures which they depict in French. The few existing studies on hybrid identities on these four novels focused more on formal and linguistic analysis and omitted meaningful sociocritic analysis. It is clear that a full study on sociocritic approach on hybrid identity on these four authors remains to be done. The research is demonstrating how different characters created by these four postmodern immigrant French-speaking writers occasionally function similarly in their texts. This gives a clear understanding of the specific behaviour of immigrants characters, vis-à-vis their various situations in the novels, and how these immigrants seek to address the problems they encounter. As this research offers reflections related to the identities and nationalities of immigrants, Laferrière, Mabanckou, Beyala and Wekape’s texts are based on the search for social belonging and a literary membership in this modern world. Therefore, they are analysing their position in a literary field as well as in a social field. In their texts they highlight the Space real or imaginary. In which way and how this Space contribute to the evolution of francophone literature? To what extent does francophone literature takes into account this representation of the Space? These questions lead to a reflection on the position occupied by these authors in the francophone field and the source of their literary inspirations. My interest in these authors is motivated by the fact that, by living and writing in a country which is not their place of birth, they each reveal different aspects of hybrid identity. Each of them, has his or her personal and original way of tackling the problem of mixed identity. They present their characters in different situations and different contexts, showing that each has been in contact with several cultures which they have assimilated and each lived in his or her own way a particular story. My study’s focus is to understand the problems of contact of cultures and their consequences, and to explore how through the characters of the novel, immigrant French speaking writers understood their acculturation as themselves have experienced an identity crisis, resulting from the confrontation of the culture of their new homeland and the culture of their country of origin. For this reason, Bourdieu’s approach “la sociocritique” will help me to found out the origin of the author’s obsession with the question of hybrid identity. I have chosen these four immigrant speaking writers to explore the strategies implemented by the novels’ narrators to construct their identities and to find out how the narrators express the intentions of the authors. In their texts, Mabanckou, Beyala, Laferrière and Wekape have used various strategies to express the quest for identity which gives clear indications of the authors’ creativity such as humour, parody, or solemnity and gravity - and the narrative voices reveal distinctive attitudes in relation to hybrid identity. At this level, other approaches will also be called for, such as the work of Westphal, Doubrovsky, Genette, Colona, etc. Through my investigation, these works present similarities and dissimilarities. Each author tackled the questions of hybrid identities according to his own experience. From there, a different commitment emerges, depending on the degree of inquiry into questions about immigration. These authors all evoke the social precariousness of their characters or the immigrant and privilege an urban framework. The examination of these works allowed me to identify their place in Francophonie literature and to discover the importance of their texts. The four novels relate to the search for identity, an aesthetic way and a search for freedom. They possess aesthetic qualities, they have a high degree of coherence. Their romantic choice shows their creativity and their strategies engender a hybrid writing that stems from their position between several languages and place these novels within the world literature.
- Full Text:
- Date Issued: 2019
Male nurses’ occupational experiences and meaning ascribed to dirty work in a female-dominated profession: A case of a hospital in the Eastern Cape Province of South Africa
- Authors: Chikungwa-Everson , Tarisai
- Date: 2019
- Subjects: Quality of work life Occupational prestige
- Language: English
- Type: Thesis , Doctoral , PhD (Industrial Psychology)
- Identifier: http://hdl.handle.net/10353/13314 , vital:39633
- Description: Orientation: Work and individual pursuit for career development have become critical in modern society. Within this, new forms of work and categories of work have emerged. Given these new forms of work and categories of work, there is a need to understand individual sense-making and experiences of transition. Research Purpose: The study explores male nurses’ occupational experiences and meaning ascribed to dirty work in a female-dominated profession. Motivation of the Study: Calls exist within the extant literature to understand modern forms of work and individual transition. One such area is that of dirty work – classified as any form of work with physical, moral or emotional taint. Little research within an Industrial and Organisational Psychology context exists on dirty work. Research Approach, Design/Method: An interpretivist, qualitative research approach using the exploratory research design was utilised to explore male nurse's occupational experiences and meaning ascribed to dirty work in a female-dominated profession. Narrative analysis was used as a basis for analysis using 27 male nurses working within the Eastern Cape Province of South Africa. Main Findings: Based on the analysis of the 27 participants that took part in the study five main narratives emerged. These included: a) a career in nursing as framed as a recursive discourse; b) the experience of a nurse as oscillating as an agentic prowess and a communal assemblage of continued suspicion; c) striving more agentic domains ahead of communal domains in entering and surviving within dirty work; d) male nurses fulfilling a gendered utility role that female nurses cannot occupy and finally, e) male nurses’ ephemeral intention of being in the nursing profession influenced by the conditions of work. ii Practical/Managerial Implications: Based on the findings of the research, interventions are proposed with ramifications for the individual, organisation and career counselling. Contribution/Value-Add: Based on the findings of the research a theoretical framework of dirty work experiences and meaning of work amongst male nurses is proposed. The framework represents a departure away from traditional career theories espoused in the work of Holland and Super as it illustrates the role of intersectionality and marginality in shaping career development. Further, the proposed framework founded from the findings of the research (though supporting modern career models such as the Systems Theory Framework and the Career Construction Theory) uniquely show drivers towards dirty work, b) the processual work accompanying dirty work involvement and finally, c) the meaning ascribed to dirty work. The study becomes the first within a South African context.
- Full Text:
- Date Issued: 2019
- Authors: Chikungwa-Everson , Tarisai
- Date: 2019
- Subjects: Quality of work life Occupational prestige
- Language: English
- Type: Thesis , Doctoral , PhD (Industrial Psychology)
- Identifier: http://hdl.handle.net/10353/13314 , vital:39633
- Description: Orientation: Work and individual pursuit for career development have become critical in modern society. Within this, new forms of work and categories of work have emerged. Given these new forms of work and categories of work, there is a need to understand individual sense-making and experiences of transition. Research Purpose: The study explores male nurses’ occupational experiences and meaning ascribed to dirty work in a female-dominated profession. Motivation of the Study: Calls exist within the extant literature to understand modern forms of work and individual transition. One such area is that of dirty work – classified as any form of work with physical, moral or emotional taint. Little research within an Industrial and Organisational Psychology context exists on dirty work. Research Approach, Design/Method: An interpretivist, qualitative research approach using the exploratory research design was utilised to explore male nurse's occupational experiences and meaning ascribed to dirty work in a female-dominated profession. Narrative analysis was used as a basis for analysis using 27 male nurses working within the Eastern Cape Province of South Africa. Main Findings: Based on the analysis of the 27 participants that took part in the study five main narratives emerged. These included: a) a career in nursing as framed as a recursive discourse; b) the experience of a nurse as oscillating as an agentic prowess and a communal assemblage of continued suspicion; c) striving more agentic domains ahead of communal domains in entering and surviving within dirty work; d) male nurses fulfilling a gendered utility role that female nurses cannot occupy and finally, e) male nurses’ ephemeral intention of being in the nursing profession influenced by the conditions of work. ii Practical/Managerial Implications: Based on the findings of the research, interventions are proposed with ramifications for the individual, organisation and career counselling. Contribution/Value-Add: Based on the findings of the research a theoretical framework of dirty work experiences and meaning of work amongst male nurses is proposed. The framework represents a departure away from traditional career theories espoused in the work of Holland and Super as it illustrates the role of intersectionality and marginality in shaping career development. Further, the proposed framework founded from the findings of the research (though supporting modern career models such as the Systems Theory Framework and the Career Construction Theory) uniquely show drivers towards dirty work, b) the processual work accompanying dirty work involvement and finally, c) the meaning ascribed to dirty work. The study becomes the first within a South African context.
- Full Text:
- Date Issued: 2019
Management capacity within small and medium tourism enterprises (SMTEs)
- Authors: Mxunyelwa, Siyabonga
- Date: 2019
- Subjects: Small business -- South Africa -- Eastern Cape -- Management , Tourism -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/41708 , vital:36574
- Description: The small to medium tourism enterprises are identified as important contributors to the growth of the local and regional economies and creates much needed entrepreneurial ventures. Universally, small to medium tourism enterprises play a significant role in the tourism sector. The small businesses are in many instances deemed to facing risk to economic environmental challenges and face uphill battles to operate their enterprises in a sustainable manner. Management of these enterprises by owners and managers seems to face challenges. This study focuses on small to medium tourism enterprises in the Eastern Cape Province, South Africa, which faces the triple threat challenges of poverty, inequality and unemployment, and is one of the economically poorest provinces of South Africa. In an endeavour to create a trajectory for progression and development of small to medium tourism enterprises, owners and managers are required to undertake management capacity programmes to deal with the problems that confront the enterprise on a daily basis. The study examines the factors impacting on management capacity with specific focus on the small to medium tourism enterprises in the Eastern Cape Province, South Africa. Management capacity is paramount as it builds managerial competency and has become significant to the small business economy, as these enterprises make every effort to avoid discontinuation. Management capacity improves business performance and small enterprises require help in order to have a broader understanding of issues that can be an impediment to address the challenges in the business environment. The factors that could impact on management capacity within the enterprises are the focus of this research. The eleven main factors were identified, namely skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy; and organisational information factors. Furthermore, the study examined the level of influence of these factors on the management capacity of small businesses in the tourism and hospitality sector in the Eastern Cape and investigated the relationships between these factors. A descriptive research design and a quantitative approach were considered suitable for this study. A systematic random sampling technique was utilised to choose a sample of 320 business respondents from the 2012 database of the Eastern Cape Parks and Tourism Agency, comprising of formally registered small tourism businesses. A total of 310 usable questionnaires was finally obtained. In this study descriptive and inferential statistics were applied. Descriptive statistics were captured to highlight the owners and managers’ general characteristics and to consolidate their measurement scores. Utilising inferential statistics, the study undertook an investigation into relationships between demographic variables and business characteristics. Furthermore, an investigation of the relationships amongst the following factors: skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy and organisational information factors was undertaken. Data were subjected to exploratory factor analysis and both the validity and reliability of the research instrument was assessed. The research findings support an overall significant correlation between management capacity and skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy and organisational information. The study also explored the relationship between demographics and business characteristics. A significant relationship was found between business characteristics and variables in the demographic profile, namely the gender of owners/managers, educational levels, qualifications, and gross annual turnover. What follows is a summation of the most significant contributions of this research. The overview of the significance of the tourism sector in the economy and the role of small businesses in the tourism and hospitality industry of the Eastern Cape will benefit researchers and potential owners/managers who have an interest in this developing sector. The study enhances the understanding of the factors that relate to management capacity. The study has established a profile of SMTE sector in the Eastern Cape, South Africa, which can play a significant role for future research. This research makes a contribution to the largely under-researched area of management capacity in small to medium tourism enterprises. Recommendations for owners/managers and consideration of future research included the following. Owners/managers need to have management skills and a strong strategic focus. Through management capacity the needs of the business will be addressed, and capacity building programmes can be tailored to maximise the benefits for owners/managers of SMTEs, thereby improving business performance and avoiding high failure rate. Managers need to be effectively trained to deal with business needs. The management of the business plays a pivotal role in the performance of the enterprise. Managers must be skilled with regards to developing strategic plans, marketing plans, and business plans, thus enhancing management capacity. Longitudinal studies can be undertaken to investigating the same factors which could impact on management capacity. It is recommended that this study be replicated across the global spectrum in order to analyse the factors that impact on management capacity of small to medium tourism businesses of other countries.
- Full Text:
- Date Issued: 2019
- Authors: Mxunyelwa, Siyabonga
- Date: 2019
- Subjects: Small business -- South Africa -- Eastern Cape -- Management , Tourism -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/41708 , vital:36574
- Description: The small to medium tourism enterprises are identified as important contributors to the growth of the local and regional economies and creates much needed entrepreneurial ventures. Universally, small to medium tourism enterprises play a significant role in the tourism sector. The small businesses are in many instances deemed to facing risk to economic environmental challenges and face uphill battles to operate their enterprises in a sustainable manner. Management of these enterprises by owners and managers seems to face challenges. This study focuses on small to medium tourism enterprises in the Eastern Cape Province, South Africa, which faces the triple threat challenges of poverty, inequality and unemployment, and is one of the economically poorest provinces of South Africa. In an endeavour to create a trajectory for progression and development of small to medium tourism enterprises, owners and managers are required to undertake management capacity programmes to deal with the problems that confront the enterprise on a daily basis. The study examines the factors impacting on management capacity with specific focus on the small to medium tourism enterprises in the Eastern Cape Province, South Africa. Management capacity is paramount as it builds managerial competency and has become significant to the small business economy, as these enterprises make every effort to avoid discontinuation. Management capacity improves business performance and small enterprises require help in order to have a broader understanding of issues that can be an impediment to address the challenges in the business environment. The factors that could impact on management capacity within the enterprises are the focus of this research. The eleven main factors were identified, namely skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy; and organisational information factors. Furthermore, the study examined the level of influence of these factors on the management capacity of small businesses in the tourism and hospitality sector in the Eastern Cape and investigated the relationships between these factors. A descriptive research design and a quantitative approach were considered suitable for this study. A systematic random sampling technique was utilised to choose a sample of 320 business respondents from the 2012 database of the Eastern Cape Parks and Tourism Agency, comprising of formally registered small tourism businesses. A total of 310 usable questionnaires was finally obtained. In this study descriptive and inferential statistics were applied. Descriptive statistics were captured to highlight the owners and managers’ general characteristics and to consolidate their measurement scores. Utilising inferential statistics, the study undertook an investigation into relationships between demographic variables and business characteristics. Furthermore, an investigation of the relationships amongst the following factors: skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy and organisational information factors was undertaken. Data were subjected to exploratory factor analysis and both the validity and reliability of the research instrument was assessed. The research findings support an overall significant correlation between management capacity and skills development; reasons for starting a business; business challenges; strategic and management knowledge; business leadership; business resources, business environment; business communication; business organisational leadership; organisational strategy and organisational information. The study also explored the relationship between demographics and business characteristics. A significant relationship was found between business characteristics and variables in the demographic profile, namely the gender of owners/managers, educational levels, qualifications, and gross annual turnover. What follows is a summation of the most significant contributions of this research. The overview of the significance of the tourism sector in the economy and the role of small businesses in the tourism and hospitality industry of the Eastern Cape will benefit researchers and potential owners/managers who have an interest in this developing sector. The study enhances the understanding of the factors that relate to management capacity. The study has established a profile of SMTE sector in the Eastern Cape, South Africa, which can play a significant role for future research. This research makes a contribution to the largely under-researched area of management capacity in small to medium tourism enterprises. Recommendations for owners/managers and consideration of future research included the following. Owners/managers need to have management skills and a strong strategic focus. Through management capacity the needs of the business will be addressed, and capacity building programmes can be tailored to maximise the benefits for owners/managers of SMTEs, thereby improving business performance and avoiding high failure rate. Managers need to be effectively trained to deal with business needs. The management of the business plays a pivotal role in the performance of the enterprise. Managers must be skilled with regards to developing strategic plans, marketing plans, and business plans, thus enhancing management capacity. Longitudinal studies can be undertaken to investigating the same factors which could impact on management capacity. It is recommended that this study be replicated across the global spectrum in order to analyse the factors that impact on management capacity of small to medium tourism businesses of other countries.
- Full Text:
- Date Issued: 2019
Mechanisms and modes of β-N-methylamino-lalanine neurotoxicity: the basis for designing therapies
- Authors: Van Onselen, Rianita
- Date: 2019
- Subjects: Cyanobacteria , Amino acids -- Toxicology , Neurotoxic agents
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/32971 , vital:32483
- Description: Since the discovery of the non-canonical amino acid β-N-methylamino-L-alanine (BMAA) and the demonstration of its acute neurotoxicity in chicks and rats, it has been postulated that BMAA might contribute to the development of neurodegenerative diseases worldwide due to its presence in numerous aquatic and terrestrial food webs. This hypothesized link was widely criticized because of the inability to reproduce symptoms in a BMAA-exposed animal model that resembled the symptoms observed in humans, and for the inability to achieve significant levels of toxicity in in vitro models via the postulated mechanisms of toxicity. The most widely described mechanism of BMAA toxicity was excitotoxicity by over-excitation of ionotropic and/or metabotropic glutamate receptors following activation by BMAA. However, the excitotoxic potency of BMAA is much lower than those of other known excitotoxins and it was not known whether BMAA could accumulate in significant concentrations in synapses to cause the said excitotoxicity. Therefore, uptake of BMAA into synaptic vesicles from where it can be released into synapses in high concentrations, was investigated and it was found that, unlike the uptake that was observed for glutamate, BMAA was not taken up into synaptic vesicles. This discovery suggests that BMAA is not released into synapses via synaptic vesicles and that excitotoxicity is an unlikely mechanism of BMAA toxicity in mammalian systems. Misincorporation of BMAA into proteins in the place of L-serine was suggested to be an important mechanism of BMAA toxicity that could lead to protein misfolding and the subsequent protein aggregates that are typically found in the central nervous system (CNS) of neurodegenerative disease patients. However, previous studies in prokaryotes and in a rat pheochromocytoma PC12 cell line showed that misincorporation of BMAA does not occur to any significant extent. However, these studies were criticized for not using human-derived model systems to show that misincorporation does not occur, and it was argued that due to differences in mitochondrial protein synthesis mechanisms, misincorporation of BMAA into human proteins could not be ruled out as a possible mechanism of toxicity. Therefore, misincorporation of BMAA was investigated in a number of human-derived non-neuronal cell lines and directly compared to the misincorporation of other known amino acid analogues. No evidence of misincorporation of BMAA into these cell lines was obtained and therefore it was concluded that misincorporation of BMAA into proteins does not occur in human-derived cell models. Although misincorporation of BMAA into proteins was refuted as a mechanism of toxicity, the strong interactions between BMAA and proteins that require extensive purification procedures to remove the associated BMAA, could not be discounted as a possible contributor to the toxicity of BMAA. Cell-free interactions between BMAA and enzymes, which resulted in reduced activity, were described previously but the nature of these interactions was never determined. Therefore, the direct interactions between BMAA and a range of commercial proteins and melanin (that is known to also have a strong affinity for BMAA) were investigated in an attempt to describe the nature of these interactions. It was discovered that BMAA has a high affinity for hydroxyl groups, and that if these hydroxyl groups in the form of hydroxyl containing amino acid residues occurred in important regulatory or active sites of proteins, BMAA reduced the enzyme activity. Catalase was subsequently selected as an important enzyme required for the maintenance of the delicate reactive oxygen species (ROS) balance in the CNS, to test the effect of BMAA on the activity of the enzyme. BMAA inhibited a human commercial extract of catalase in a cell free system, and this inhibition appeared to be non-competitive in nature. Subsequently, catalase in an extract from a human cell line was also shown to be inhibited by BMAA and it was concluded that this BMAA induced inhibition of catalase could be an important contributor to the toxicity of BMAA in in vivo systems. The affinity of BMAA for hydroxyl groups, especially the reactive L-tyrosine side chain hydroxyl, was recognized as a possible mechanism that can be utilized to protect against the toxicity of BMAA. It was subsequently shown that excess concentrations of L-serine and L-tyrosine could protect against the BMAA-induced enzyme inhibition and improper folding of proteins in a cell-free system. By administering an equimolar concentration of either L-phenylalanine (the soluble precursor of L-tyrosine) or L-serine an hour before administration of BMAA in a rat model, the BMAA-induced neurotoxicity was greatly reduced, especially by treatment with L-phenylalanine, which resulted in a decrease of between 60-70% in the observed neuropathologies. It was recognized that the protection offered by L-phenylalanine was greater than would be expected if protection was by virtue of direct hydroxyl binding alone and it was subsequently hypothesized that the conversion of L-phenylalanine to dopamine could have contributed to the observed protection. Subsequently, the possible protection offered by dopamine, administered as L-DOPA, against BMAA neurotoxicity was investigated in the same neonatal rat model and compared to the protection offered by L-tyrosine. It was discovered that dopamine protected against the BMAAinduced neuronal cell losses in the hippocampus, striatum and spinal cord but it was not as efficient as L-tyrosine in protection against the BMAA-induced proteinopathies, suggesting two distinct mechanisms of BMAA toxicity, one of which is a depletion of dopamine, which had not been previously described. Finally, the nature of the BMAA-induced dopamine depletion was investigated by administering BMAA in combination with other dopaminergic modifiers viz. apomorphine (a D1/D2 receptor agonist), a dopamine transporter inhibitor (GBR12783) and reserpine (a vesicular monoamine transporter -VMAT2- inhibitor) to the neonatal rat model in an attempt to describe how BMAA functions as a dopaminergic toxin. Based on these results it was concluded that BMAA inhibits uptake of dopamine into synaptic vesicles by inhibiting VMAT2-mediated uptake of dopamine, which causes neuronal loss in the hippocampus, striatum and substantia nigra pars compacta, and that the BMAA-induced inhibition of catalase contributes significantly to the toxicity of BMAA by causing an accumulation of hydrogen peroxide in the hippocampus, striatum and spinal cord, which results in extensive neuronal damage in these areas. This work was the first to thoroughly investigate the mechanisms that explain the observed pathologies caused by BMAA in an in vivo model, and was the first to suggest that BMAA can reduce the dopamine in the CNS by inhibiting VMAT2-mediated uptake of dopamine into synaptic vesicles, and increase damage by reactive oxygen species by inhibiting catalase. BMAA is therefore a multimechanistic and multimodal.
- Full Text:
- Date Issued: 2019
- Authors: Van Onselen, Rianita
- Date: 2019
- Subjects: Cyanobacteria , Amino acids -- Toxicology , Neurotoxic agents
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/32971 , vital:32483
- Description: Since the discovery of the non-canonical amino acid β-N-methylamino-L-alanine (BMAA) and the demonstration of its acute neurotoxicity in chicks and rats, it has been postulated that BMAA might contribute to the development of neurodegenerative diseases worldwide due to its presence in numerous aquatic and terrestrial food webs. This hypothesized link was widely criticized because of the inability to reproduce symptoms in a BMAA-exposed animal model that resembled the symptoms observed in humans, and for the inability to achieve significant levels of toxicity in in vitro models via the postulated mechanisms of toxicity. The most widely described mechanism of BMAA toxicity was excitotoxicity by over-excitation of ionotropic and/or metabotropic glutamate receptors following activation by BMAA. However, the excitotoxic potency of BMAA is much lower than those of other known excitotoxins and it was not known whether BMAA could accumulate in significant concentrations in synapses to cause the said excitotoxicity. Therefore, uptake of BMAA into synaptic vesicles from where it can be released into synapses in high concentrations, was investigated and it was found that, unlike the uptake that was observed for glutamate, BMAA was not taken up into synaptic vesicles. This discovery suggests that BMAA is not released into synapses via synaptic vesicles and that excitotoxicity is an unlikely mechanism of BMAA toxicity in mammalian systems. Misincorporation of BMAA into proteins in the place of L-serine was suggested to be an important mechanism of BMAA toxicity that could lead to protein misfolding and the subsequent protein aggregates that are typically found in the central nervous system (CNS) of neurodegenerative disease patients. However, previous studies in prokaryotes and in a rat pheochromocytoma PC12 cell line showed that misincorporation of BMAA does not occur to any significant extent. However, these studies were criticized for not using human-derived model systems to show that misincorporation does not occur, and it was argued that due to differences in mitochondrial protein synthesis mechanisms, misincorporation of BMAA into human proteins could not be ruled out as a possible mechanism of toxicity. Therefore, misincorporation of BMAA was investigated in a number of human-derived non-neuronal cell lines and directly compared to the misincorporation of other known amino acid analogues. No evidence of misincorporation of BMAA into these cell lines was obtained and therefore it was concluded that misincorporation of BMAA into proteins does not occur in human-derived cell models. Although misincorporation of BMAA into proteins was refuted as a mechanism of toxicity, the strong interactions between BMAA and proteins that require extensive purification procedures to remove the associated BMAA, could not be discounted as a possible contributor to the toxicity of BMAA. Cell-free interactions between BMAA and enzymes, which resulted in reduced activity, were described previously but the nature of these interactions was never determined. Therefore, the direct interactions between BMAA and a range of commercial proteins and melanin (that is known to also have a strong affinity for BMAA) were investigated in an attempt to describe the nature of these interactions. It was discovered that BMAA has a high affinity for hydroxyl groups, and that if these hydroxyl groups in the form of hydroxyl containing amino acid residues occurred in important regulatory or active sites of proteins, BMAA reduced the enzyme activity. Catalase was subsequently selected as an important enzyme required for the maintenance of the delicate reactive oxygen species (ROS) balance in the CNS, to test the effect of BMAA on the activity of the enzyme. BMAA inhibited a human commercial extract of catalase in a cell free system, and this inhibition appeared to be non-competitive in nature. Subsequently, catalase in an extract from a human cell line was also shown to be inhibited by BMAA and it was concluded that this BMAA induced inhibition of catalase could be an important contributor to the toxicity of BMAA in in vivo systems. The affinity of BMAA for hydroxyl groups, especially the reactive L-tyrosine side chain hydroxyl, was recognized as a possible mechanism that can be utilized to protect against the toxicity of BMAA. It was subsequently shown that excess concentrations of L-serine and L-tyrosine could protect against the BMAA-induced enzyme inhibition and improper folding of proteins in a cell-free system. By administering an equimolar concentration of either L-phenylalanine (the soluble precursor of L-tyrosine) or L-serine an hour before administration of BMAA in a rat model, the BMAA-induced neurotoxicity was greatly reduced, especially by treatment with L-phenylalanine, which resulted in a decrease of between 60-70% in the observed neuropathologies. It was recognized that the protection offered by L-phenylalanine was greater than would be expected if protection was by virtue of direct hydroxyl binding alone and it was subsequently hypothesized that the conversion of L-phenylalanine to dopamine could have contributed to the observed protection. Subsequently, the possible protection offered by dopamine, administered as L-DOPA, against BMAA neurotoxicity was investigated in the same neonatal rat model and compared to the protection offered by L-tyrosine. It was discovered that dopamine protected against the BMAAinduced neuronal cell losses in the hippocampus, striatum and spinal cord but it was not as efficient as L-tyrosine in protection against the BMAA-induced proteinopathies, suggesting two distinct mechanisms of BMAA toxicity, one of which is a depletion of dopamine, which had not been previously described. Finally, the nature of the BMAA-induced dopamine depletion was investigated by administering BMAA in combination with other dopaminergic modifiers viz. apomorphine (a D1/D2 receptor agonist), a dopamine transporter inhibitor (GBR12783) and reserpine (a vesicular monoamine transporter -VMAT2- inhibitor) to the neonatal rat model in an attempt to describe how BMAA functions as a dopaminergic toxin. Based on these results it was concluded that BMAA inhibits uptake of dopamine into synaptic vesicles by inhibiting VMAT2-mediated uptake of dopamine, which causes neuronal loss in the hippocampus, striatum and substantia nigra pars compacta, and that the BMAA-induced inhibition of catalase contributes significantly to the toxicity of BMAA by causing an accumulation of hydrogen peroxide in the hippocampus, striatum and spinal cord, which results in extensive neuronal damage in these areas. This work was the first to thoroughly investigate the mechanisms that explain the observed pathologies caused by BMAA in an in vivo model, and was the first to suggest that BMAA can reduce the dopamine in the CNS by inhibiting VMAT2-mediated uptake of dopamine into synaptic vesicles, and increase damage by reactive oxygen species by inhibiting catalase. BMAA is therefore a multimechanistic and multimodal.
- Full Text:
- Date Issued: 2019
Medicinal Plants Used to Treat and Manage Respiratory Infections in the Limpopo Province, South Africa: Phytotherapeutic Study of Bapedi Traditional Healers’ Practices
- Authors: Semenya, Sebua Silas
- Date: 2019
- Subjects: Medicinal plants Respiratory infections -- Alternative treatment
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15716 , vital:40512
- Description: There is paucity of data on South African traditional healers’ (THs) phytotherapeutic practices regarding respiratory infections (RIs). Several people in South Africa are contracting RIs due to prevalence of risk factors. This situation is exacerbated by limited modern health care facilities and associated personnel in some provinces in the country. The primary objectives of this study were twofold. First purpose was to execute a comprehensive social and ethnobotanical surveys aimed at (a) establishing the types of RIs treated by THs and diagnosis techniques used, (b) plants used as therapies for RIs and associated indigenous knowledge practices, (c) source/s of plants used as medicines, (d) harvesting practices, current local availability status, conservation status and threats of indigenous plants as well as the level of conservation knowledge possessed by THs. The second objective was to assess the therapeutic value of the four most frequently used plant species by THs by (a) analysing the phytochemical profile of the plant extracts, (b) their antioxidant activities, and (c) their antibacterial activities. Information linked to the social and ethnobotanical surveys was gathered via a semi-structured questionnaires, supplemented by field observations during face-to-face interview with 240 conveniently selected THs practicing in the municipalities of Capricorn, Sekhukhune and Waterberg districts of the Limpopo Province, South Africa. Data were generally analysed using Microsoft Excel and Statistical Package for the Social Sciences (SPSS). In addition to these softwares, ethnobotanical data were analysed via quantitative ethnobotanical indexes namely use mention (UM), fidelity level (FL), use value (UV) and preference ranking (PR). For laboratory experiments, qualitative phytochemical constitutes of the crude extracts were determined using the standard screening methods. The antioxidant activities of acetone, dichlomethane, hexane, methanol and water crude extracts were evaluated using qualitative and quantitative 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assays. Antibacterial activities of these extracts was assessed using microdilution and bioautography assays. Six types of RIs; tuberculosis (84.1%), sore throat (65%), asthma (58.3%), sinusitis (55%), pneumonia (53.3%) and rhinitis (43.7%) were treated by THs practicing as herbalists (58.7%), herbalists and diviners (40.5%), and diviners (0.4%). The identification of these RIs was based on the patients’ presentation of certain clinical symptoms, with THs practicing both herbalism and divination additionally using bone casting. There was a broad overlap between the clinical signs used to diagnose most of the RIs, and the specificity of symptoms followed when ascertaining an individual infection was low. A total of 224 plant species (83% indigenous and 16.9% exotics) belonging to 177 genera and 85 botanical families, mainly the Fabaceae (25 spp.) and Asteraceae (16 spp.) were used by THs as herbal medicines for the aforesaid RIs and perceived related symptoms (RSs). Most of the documented plant species were used for tuberculosis (82.1%) and asthma (46.4%). Roots (64%) and leaves (13%) formed an important mainstay for medicinal recipes preparations. Different routes of administering these recipes were noted, with oral (75.6%) and nasal (18.8%) being the most preferred. The most widely used species by THs to treat and manage all the six RIs with high UM, FL, UV and PR values included Clerodendrum ternatum, Cryptocarya transvaalensis, Enicostema axillare, Lasiosiphon caffer and Stylochaeton natalensis. Overall larger numbers of species used by Bapedi THs including the mentioned ones are recorded for the first time in scientific literature as remedies for RIs and RSs, thus reflecting a need for more similar studies amongst other ethnic groups of South Africa and elsewhere. The phytochemical screening of four most used plants C. ternatum, C. transvaalensis, E. axillare and L. caffer crude extracts revealed the presence of alkaloids, anthraquinones, cardiac glycosides, flavonoids, phlobatannin, saponins, steroids, tannins and terpenes. All plants including those that did not display any antioxidant activities using qualitative DPPH assay displayed a certain level of scavenging activity when quantified, with the mentioned extracts from E. axillare (water and hexane), L. caffer (water and acetone) and C. ternatum (acetone) showing excellent activity almost comparable to a standard antioxidant drug (ascorbic acid). Plant extracts from all used solvents were active against Mycobacterium smegmatis, Klebsiella pneumoniae, Staphylococcus aureus and Pseudomonas aeruginosa with miniumum bactericidal concentration values ranging between 0.019 and 2.5 mg/ml depending on the plant species. Some of plant extracts exhibited minimum inhibitory concentration values ranging between 0.63 to 2.5 mg/ml. This study showed that most of the diagnosis methods used by Bapedi THs and their herbal medicines have the potential to contribute towards the management and treatment of RIs and RSs. iii | Page Future endeavour should be focused on the following: (a) possibility of collaboration between questioned THs and local western health care practitioners in the treatment of these diseases, and (b) isolation, purification and characterization of the biologically active compounds from extract of the above-stated plants, amongst other inquiries.
- Full Text:
- Date Issued: 2019
- Authors: Semenya, Sebua Silas
- Date: 2019
- Subjects: Medicinal plants Respiratory infections -- Alternative treatment
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15716 , vital:40512
- Description: There is paucity of data on South African traditional healers’ (THs) phytotherapeutic practices regarding respiratory infections (RIs). Several people in South Africa are contracting RIs due to prevalence of risk factors. This situation is exacerbated by limited modern health care facilities and associated personnel in some provinces in the country. The primary objectives of this study were twofold. First purpose was to execute a comprehensive social and ethnobotanical surveys aimed at (a) establishing the types of RIs treated by THs and diagnosis techniques used, (b) plants used as therapies for RIs and associated indigenous knowledge practices, (c) source/s of plants used as medicines, (d) harvesting practices, current local availability status, conservation status and threats of indigenous plants as well as the level of conservation knowledge possessed by THs. The second objective was to assess the therapeutic value of the four most frequently used plant species by THs by (a) analysing the phytochemical profile of the plant extracts, (b) their antioxidant activities, and (c) their antibacterial activities. Information linked to the social and ethnobotanical surveys was gathered via a semi-structured questionnaires, supplemented by field observations during face-to-face interview with 240 conveniently selected THs practicing in the municipalities of Capricorn, Sekhukhune and Waterberg districts of the Limpopo Province, South Africa. Data were generally analysed using Microsoft Excel and Statistical Package for the Social Sciences (SPSS). In addition to these softwares, ethnobotanical data were analysed via quantitative ethnobotanical indexes namely use mention (UM), fidelity level (FL), use value (UV) and preference ranking (PR). For laboratory experiments, qualitative phytochemical constitutes of the crude extracts were determined using the standard screening methods. The antioxidant activities of acetone, dichlomethane, hexane, methanol and water crude extracts were evaluated using qualitative and quantitative 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assays. Antibacterial activities of these extracts was assessed using microdilution and bioautography assays. Six types of RIs; tuberculosis (84.1%), sore throat (65%), asthma (58.3%), sinusitis (55%), pneumonia (53.3%) and rhinitis (43.7%) were treated by THs practicing as herbalists (58.7%), herbalists and diviners (40.5%), and diviners (0.4%). The identification of these RIs was based on the patients’ presentation of certain clinical symptoms, with THs practicing both herbalism and divination additionally using bone casting. There was a broad overlap between the clinical signs used to diagnose most of the RIs, and the specificity of symptoms followed when ascertaining an individual infection was low. A total of 224 plant species (83% indigenous and 16.9% exotics) belonging to 177 genera and 85 botanical families, mainly the Fabaceae (25 spp.) and Asteraceae (16 spp.) were used by THs as herbal medicines for the aforesaid RIs and perceived related symptoms (RSs). Most of the documented plant species were used for tuberculosis (82.1%) and asthma (46.4%). Roots (64%) and leaves (13%) formed an important mainstay for medicinal recipes preparations. Different routes of administering these recipes were noted, with oral (75.6%) and nasal (18.8%) being the most preferred. The most widely used species by THs to treat and manage all the six RIs with high UM, FL, UV and PR values included Clerodendrum ternatum, Cryptocarya transvaalensis, Enicostema axillare, Lasiosiphon caffer and Stylochaeton natalensis. Overall larger numbers of species used by Bapedi THs including the mentioned ones are recorded for the first time in scientific literature as remedies for RIs and RSs, thus reflecting a need for more similar studies amongst other ethnic groups of South Africa and elsewhere. The phytochemical screening of four most used plants C. ternatum, C. transvaalensis, E. axillare and L. caffer crude extracts revealed the presence of alkaloids, anthraquinones, cardiac glycosides, flavonoids, phlobatannin, saponins, steroids, tannins and terpenes. All plants including those that did not display any antioxidant activities using qualitative DPPH assay displayed a certain level of scavenging activity when quantified, with the mentioned extracts from E. axillare (water and hexane), L. caffer (water and acetone) and C. ternatum (acetone) showing excellent activity almost comparable to a standard antioxidant drug (ascorbic acid). Plant extracts from all used solvents were active against Mycobacterium smegmatis, Klebsiella pneumoniae, Staphylococcus aureus and Pseudomonas aeruginosa with miniumum bactericidal concentration values ranging between 0.019 and 2.5 mg/ml depending on the plant species. Some of plant extracts exhibited minimum inhibitory concentration values ranging between 0.63 to 2.5 mg/ml. This study showed that most of the diagnosis methods used by Bapedi THs and their herbal medicines have the potential to contribute towards the management and treatment of RIs and RSs. iii | Page Future endeavour should be focused on the following: (a) possibility of collaboration between questioned THs and local western health care practitioners in the treatment of these diseases, and (b) isolation, purification and characterization of the biologically active compounds from extract of the above-stated plants, amongst other inquiries.
- Full Text:
- Date Issued: 2019
Microalgae as indicators of environmental change in the St Lucia estuarine system
- Authors: Nunes, Monique
- Date: 2019
- Subjects: Microalgae -- South Africa -- St Lucia estuarine
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/31165 , vital:31333
- Description: The St Lucia system represents 56% of the estuarine habitat area in South Africa. This dynamic estuarine lake responds to a complex interaction of climatic and anthropogenic drivers. There has been a long history of human interventions and the extended drought (2002-2012) led to major changes. In 1952, the inlet shared between the estuarine system and the Mfolozi River was artificially separated, which significantly reduced freshwater inflow. The systems were separated because of the silt load from the expanding agricultural activities in the Mfolozi River catchment. The drought prompted a critical review of re-establishing the historic connection, and in July 2012, the beach spillway was excavated marking the start of restoring connectivity. Increased rainfall coupled with the partial re-connection with the agriculturally-impacted Mfolozi River shifted the St Lucia estuarine system to a new wet phase. This study investigated the microalgal dynamics of the estuarine system as it transitioned to this new wet phase. Results showed that the phytoplankton and microphytobenthos (MPB) biomass was low (< 5 ug l-1 and < 60 mg m-2 respectively) throughout the system due to nutrient and light availability, water residence time and sediment type. The increased freshwater inflow from the Mfolozi River was limited to the Narrows and available nutrients promoted the growth of cyanobacteria and dinophytes in the water column. Of interest was the presence of the potentially harmful algal species Prorocentrum minimum. A weekly study investigated the relationship between freshwater inflow, phytoplankton succession and the introduction and persistence of harmful microalgal species in the lower reaches. The increased freshwater inflow received from the Mfolozi River has led to a system in a constant state of flux. The changes in salinity, light availability and water residence time, shifted the phytoplankton functional group structure to one where chlorophytes and euglenoids were dominant. The persistence of the nutrient tolerant euglenoids highlighted the influence of the nutrient-enriched freshwater inflow on the phytoplankton functional groups. However, the relative abundance of all functional groups remained low due to the rapid change in environmental conditions. The next step was to test the use of an artificial substrate as a monitoring method to detect nutrient induced change. Findings from the 28-day study showed that epilithic diatom communities growing on glass slides were good indicators of nutrient enrichment. The epilithic algal biomass increased significantly from 1.5 mg m-2 (Day 14) to 6 mg m-2 (Day 21), following peak river inflow. In contrast, the phytoplankton and MPB showed no discernible increase in biomass. Epilithic diatom community diversity, richness and evenness scores declined due to the increasing relative abundance of a single nutrient tolerant species, Cocconeis placentula var. euglypta. The use of diatoms as indicators of change depends on the accuracy of identification to species level. This can be a slow process requiring a high level of taxonomic expertise. Considering that molecular phylogenetic methods are readily used to produce a reliable taxonomic list, the suitability of DNA metabarcoding for diatom monitoring in the St Lucia Estuary was tested. Comparisons between the molecular and morphological method indicated that the diatom taxonomic composition was similar at 9 to 27% for genus level and 2 to 9% at species level. The low taxonomic similarity was related to the large number of unclassified DNA representative sequences included in the molecular inventory due to the incomplete DNA library database. However, the available operational taxonomic units (OTUs) from the molecular method did provide an effective alternative to determine the relevant community diversity estimates required for the application of the South African Estuarine Health Index (EHI). This research has highlighted the dynamic nature of the St Lucia estuarine system and the effectiveness of the microalgal communities to differentiate between the cyclical climatic phases and anthropogenic stressors such as nutrient enrichment.
- Full Text:
- Date Issued: 2019
- Authors: Nunes, Monique
- Date: 2019
- Subjects: Microalgae -- South Africa -- St Lucia estuarine
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/31165 , vital:31333
- Description: The St Lucia system represents 56% of the estuarine habitat area in South Africa. This dynamic estuarine lake responds to a complex interaction of climatic and anthropogenic drivers. There has been a long history of human interventions and the extended drought (2002-2012) led to major changes. In 1952, the inlet shared between the estuarine system and the Mfolozi River was artificially separated, which significantly reduced freshwater inflow. The systems were separated because of the silt load from the expanding agricultural activities in the Mfolozi River catchment. The drought prompted a critical review of re-establishing the historic connection, and in July 2012, the beach spillway was excavated marking the start of restoring connectivity. Increased rainfall coupled with the partial re-connection with the agriculturally-impacted Mfolozi River shifted the St Lucia estuarine system to a new wet phase. This study investigated the microalgal dynamics of the estuarine system as it transitioned to this new wet phase. Results showed that the phytoplankton and microphytobenthos (MPB) biomass was low (< 5 ug l-1 and < 60 mg m-2 respectively) throughout the system due to nutrient and light availability, water residence time and sediment type. The increased freshwater inflow from the Mfolozi River was limited to the Narrows and available nutrients promoted the growth of cyanobacteria and dinophytes in the water column. Of interest was the presence of the potentially harmful algal species Prorocentrum minimum. A weekly study investigated the relationship between freshwater inflow, phytoplankton succession and the introduction and persistence of harmful microalgal species in the lower reaches. The increased freshwater inflow received from the Mfolozi River has led to a system in a constant state of flux. The changes in salinity, light availability and water residence time, shifted the phytoplankton functional group structure to one where chlorophytes and euglenoids were dominant. The persistence of the nutrient tolerant euglenoids highlighted the influence of the nutrient-enriched freshwater inflow on the phytoplankton functional groups. However, the relative abundance of all functional groups remained low due to the rapid change in environmental conditions. The next step was to test the use of an artificial substrate as a monitoring method to detect nutrient induced change. Findings from the 28-day study showed that epilithic diatom communities growing on glass slides were good indicators of nutrient enrichment. The epilithic algal biomass increased significantly from 1.5 mg m-2 (Day 14) to 6 mg m-2 (Day 21), following peak river inflow. In contrast, the phytoplankton and MPB showed no discernible increase in biomass. Epilithic diatom community diversity, richness and evenness scores declined due to the increasing relative abundance of a single nutrient tolerant species, Cocconeis placentula var. euglypta. The use of diatoms as indicators of change depends on the accuracy of identification to species level. This can be a slow process requiring a high level of taxonomic expertise. Considering that molecular phylogenetic methods are readily used to produce a reliable taxonomic list, the suitability of DNA metabarcoding for diatom monitoring in the St Lucia Estuary was tested. Comparisons between the molecular and morphological method indicated that the diatom taxonomic composition was similar at 9 to 27% for genus level and 2 to 9% at species level. The low taxonomic similarity was related to the large number of unclassified DNA representative sequences included in the molecular inventory due to the incomplete DNA library database. However, the available operational taxonomic units (OTUs) from the molecular method did provide an effective alternative to determine the relevant community diversity estimates required for the application of the South African Estuarine Health Index (EHI). This research has highlighted the dynamic nature of the St Lucia estuarine system and the effectiveness of the microalgal communities to differentiate between the cyclical climatic phases and anthropogenic stressors such as nutrient enrichment.
- Full Text:
- Date Issued: 2019
Microstructural evolution of welded creep aged 12% cr martensitic stainless steel
- Authors: Marx, Genevéve
- Date: 2019
- Subjects: Stainless steel -- Welding
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/30766 , vital:31128
- Description: Tempered martensite ferritic (TMF) steels with 9-12% Cr additions are used extensively for high-pressure steam pipes in coal-fired power plants. They operate at temperatures above 500ºC and are consequently susceptible to creep damage. Due to economic reasons, welding must be performed on service exposed materials when a component needs to be replaced. Fusion welding results in the formation of different microstructural regions within the weldment. The primary failure mechanism of TMF steel welded components is Type IV cracking that results from accelerated void formation in the fine-grained heat affected zone (FGHAZ) during creep. Short-term creep-tests performed across weldments made on new and service exposed steels have shown that the weldment consistently fails in the FGHAZ of the service exposed material. This observation has not yet been fully explained since not much is known about the microstructural evolution of creep aged material during welding. Thus, further investigation on the microstructure of welded creep aged material is warranted. The main aim of this thesis was to investigate the microstructural evolution when welding upon creep aged 9-12% Cr martensitic steels using advanced electron microscopy techniques. X20CrMoV12-1 (12% Cr) in the virgin and long-term service-exposed state were investigated. GleebleTM weld simulation of the FGHAZ was performed on the materials. Detailed microstructural investigations were conducted on the parent and simulated FGHAZ materials to analyse the voids, dislocation density, micro-grains, and precipitates (M23C6, MX, Laves, Z-phase) in the materials. Light Microscopy (LM) and Scanning Electron Microscopy (SEM) was used to examine the voids. Twin-jet electropolished specimens were prepared for precipitate, micro-grain and substructure analyses using Transmission Kikuchi Diffraction (TKD) combined with Energy Dispersive Spectrometry (EDS), Concentric Backscatter (CBS) imaging, Energy-Filtered Transmission Electron Microscopy (EFTEM), and Annular Dark-Field Scanning Transmission Electron Microscopy (ADF-STEM) combined with EDS. The precipitates were extracted from the iron matrix using Bulk Replication and further investigated using EFTEM and STEM-EDS.
- Full Text:
- Date Issued: 2019
- Authors: Marx, Genevéve
- Date: 2019
- Subjects: Stainless steel -- Welding
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/30766 , vital:31128
- Description: Tempered martensite ferritic (TMF) steels with 9-12% Cr additions are used extensively for high-pressure steam pipes in coal-fired power plants. They operate at temperatures above 500ºC and are consequently susceptible to creep damage. Due to economic reasons, welding must be performed on service exposed materials when a component needs to be replaced. Fusion welding results in the formation of different microstructural regions within the weldment. The primary failure mechanism of TMF steel welded components is Type IV cracking that results from accelerated void formation in the fine-grained heat affected zone (FGHAZ) during creep. Short-term creep-tests performed across weldments made on new and service exposed steels have shown that the weldment consistently fails in the FGHAZ of the service exposed material. This observation has not yet been fully explained since not much is known about the microstructural evolution of creep aged material during welding. Thus, further investigation on the microstructure of welded creep aged material is warranted. The main aim of this thesis was to investigate the microstructural evolution when welding upon creep aged 9-12% Cr martensitic steels using advanced electron microscopy techniques. X20CrMoV12-1 (12% Cr) in the virgin and long-term service-exposed state were investigated. GleebleTM weld simulation of the FGHAZ was performed on the materials. Detailed microstructural investigations were conducted on the parent and simulated FGHAZ materials to analyse the voids, dislocation density, micro-grains, and precipitates (M23C6, MX, Laves, Z-phase) in the materials. Light Microscopy (LM) and Scanning Electron Microscopy (SEM) was used to examine the voids. Twin-jet electropolished specimens were prepared for precipitate, micro-grain and substructure analyses using Transmission Kikuchi Diffraction (TKD) combined with Energy Dispersive Spectrometry (EDS), Concentric Backscatter (CBS) imaging, Energy-Filtered Transmission Electron Microscopy (EFTEM), and Annular Dark-Field Scanning Transmission Electron Microscopy (ADF-STEM) combined with EDS. The precipitates were extracted from the iron matrix using Bulk Replication and further investigated using EFTEM and STEM-EDS.
- Full Text:
- Date Issued: 2019
Model for the alleviation of poverty in South Africa
- Authors: Visagie, Jana
- Date: 2019
- Subjects: Poverty -- South Africa , Poverty -- Prevention
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/45701 , vital:38956
- Description: The existence of extreme poverty in an affluent world is morally unacceptable and action needs to be taken. The reduction of economic and social inequality within countries and between countries, as well as the honouring of human rights, is of utmost importance, but the eradication of poverty must take priority One of the main problems with poverty is that poverty impedes human flourishing). People are hungry and constantly live in pain and anguish while education is hampered. People do not develop fully on cognitive and physical levels as poverty allows the exploitation of the poor and their bodies. Feelings of shame and worthlessness are established for reasons people cannot control. To contribute to the ongoing attempts to reduce poverty, it is necessary to have an understanding as to why people remain poor in an affluent world and what can be done to address the causes of poverty. Unless a global culture of ethics and value alignment is pursued for the reduction of poverty, there will be devastating effects for the future Underwriting lasting escapes from chronic poverty demands more investment in education, employment and human development potentials and in the related infrastructure that permits people to enhance their living standards while developing their resilience to handle setbacks and the effects of climate change.ffects include, for example, disaster-risk management, global healthcare and social cohesion. These investment efforts 9 have the ability to generate a virtuous cycle of poverty reduction, national economic growth and enlarged individual opportunity This could diminish the inequalities that decelerate human development. The lack of practical and outcome-based poverty reduction models affords this research with a unique opportunity to fulfil the need and to contribute to the body of knowledge regarding the reduction of poverty towards 2030.
- Full Text:
- Date Issued: 2019
- Authors: Visagie, Jana
- Date: 2019
- Subjects: Poverty -- South Africa , Poverty -- Prevention
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/45701 , vital:38956
- Description: The existence of extreme poverty in an affluent world is morally unacceptable and action needs to be taken. The reduction of economic and social inequality within countries and between countries, as well as the honouring of human rights, is of utmost importance, but the eradication of poverty must take priority One of the main problems with poverty is that poverty impedes human flourishing). People are hungry and constantly live in pain and anguish while education is hampered. People do not develop fully on cognitive and physical levels as poverty allows the exploitation of the poor and their bodies. Feelings of shame and worthlessness are established for reasons people cannot control. To contribute to the ongoing attempts to reduce poverty, it is necessary to have an understanding as to why people remain poor in an affluent world and what can be done to address the causes of poverty. Unless a global culture of ethics and value alignment is pursued for the reduction of poverty, there will be devastating effects for the future Underwriting lasting escapes from chronic poverty demands more investment in education, employment and human development potentials and in the related infrastructure that permits people to enhance their living standards while developing their resilience to handle setbacks and the effects of climate change.ffects include, for example, disaster-risk management, global healthcare and social cohesion. These investment efforts 9 have the ability to generate a virtuous cycle of poverty reduction, national economic growth and enlarged individual opportunity This could diminish the inequalities that decelerate human development. The lack of practical and outcome-based poverty reduction models affords this research with a unique opportunity to fulfil the need and to contribute to the body of knowledge regarding the reduction of poverty towards 2030.
- Full Text:
- Date Issued: 2019
Modelling storm-time TEC changes using linear and non-linear techniques
- Authors: Uwamahoro, Jean Claude
- Date: 2019
- Subjects: Magnetic storms , Astronomy -- Computer programs , Imaging systems in astronomy , Ionospheric storms , Electrons -- Measurement , Magnetosphere -- Observations
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/92908 , vital:30762
- Description: Statistical models based on empirical orthogonal functions (EOF) analysis and non-linear regression analysis (NLRA) were developed for the purpose of estimating the ionospheric total electron content (TEC) during geomagnetic storms. The well-known least squares method (LSM) and Metropolis-Hastings algorithm (MHA) were used as optimization techniques to determine the unknown coefficients of the developed analytical expressions. Artificial Neural Networks (ANNs), the International Reference Ionosphere (IRI) model, and the Multi-Instrument Data Analysis System (MIDAS) tomographic inversion algorithm were also applied to storm-time TEC modelling/reconstruction for various latitudes of the African sector and surrounding areas. This work presents some of the first statistical modeling of the mid-latitude and low-latitude ionosphere during geomagnetic storms that includes solar, geomagnetic and neutral wind drivers.Development and validation of the empirical models were based on storm-time TEC data derived from the global positioning system (GPS) measurements over ground receivers within Africa and surrounding areas. The storm criterion applied was Dst 6 −50 nT and/or Kp > 4. The performance evaluation of MIDAS compared with ANNs to reconstruct storm-time TEC over the African low- and mid-latitude regions showed that MIDAS and ANNs provide comparable results. Their respective mean absolute error (MAE) values were 4.81 and 4.18 TECU. The ANN model was, however, found to perform 24.37 % better than MIDAS at estimating storm-time TEC for low latitudes, while MIDAS is 13.44 % more accurate than ANN for the mid-latitudes. When their performances are compared with the IRI model, both MIDAS and ANN model were found to provide more accurate storm-time TEC reconstructions for the African low- and mid-latitude regions. A comparative study of the performances of EOF, NLRA, ANN, and IRI models to estimate TEC during geomagnetic storm conditions over various latitudes showed that the ANN model is about 10 %, 26 %, and 58 % more accurate than EOF, NLRA, and IRI models, respectively, while EOF was found to perform 15 %, and 44 % better than NLRA and IRI, respectively. It was further found that the NLRA model is 25 % more accurate than the IRI model. We have also investigated for the first time, the role of meridional neutral winds (from the Horizontal Wind Model) to storm-time TEC modelling in the low latitude, northern and southern hemisphere mid-latitude regions of the African sector, based on ANN models. Statistics have shown that the inclusion of the meridional wind velocity in TEC modelling during geomagnetic storms leads to percentage improvements of about 5 % for the low latitude, 10 % and 5 % for the northern and southern hemisphere mid-latitude regions, respectively. High-latitude storm-induced winds and the inter-hemispheric blows of the meridional winds from summer to winter hemisphere have been suggested to be associated with these improvements.
- Full Text:
- Date Issued: 2019
- Authors: Uwamahoro, Jean Claude
- Date: 2019
- Subjects: Magnetic storms , Astronomy -- Computer programs , Imaging systems in astronomy , Ionospheric storms , Electrons -- Measurement , Magnetosphere -- Observations
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/92908 , vital:30762
- Description: Statistical models based on empirical orthogonal functions (EOF) analysis and non-linear regression analysis (NLRA) were developed for the purpose of estimating the ionospheric total electron content (TEC) during geomagnetic storms. The well-known least squares method (LSM) and Metropolis-Hastings algorithm (MHA) were used as optimization techniques to determine the unknown coefficients of the developed analytical expressions. Artificial Neural Networks (ANNs), the International Reference Ionosphere (IRI) model, and the Multi-Instrument Data Analysis System (MIDAS) tomographic inversion algorithm were also applied to storm-time TEC modelling/reconstruction for various latitudes of the African sector and surrounding areas. This work presents some of the first statistical modeling of the mid-latitude and low-latitude ionosphere during geomagnetic storms that includes solar, geomagnetic and neutral wind drivers.Development and validation of the empirical models were based on storm-time TEC data derived from the global positioning system (GPS) measurements over ground receivers within Africa and surrounding areas. The storm criterion applied was Dst 6 −50 nT and/or Kp > 4. The performance evaluation of MIDAS compared with ANNs to reconstruct storm-time TEC over the African low- and mid-latitude regions showed that MIDAS and ANNs provide comparable results. Their respective mean absolute error (MAE) values were 4.81 and 4.18 TECU. The ANN model was, however, found to perform 24.37 % better than MIDAS at estimating storm-time TEC for low latitudes, while MIDAS is 13.44 % more accurate than ANN for the mid-latitudes. When their performances are compared with the IRI model, both MIDAS and ANN model were found to provide more accurate storm-time TEC reconstructions for the African low- and mid-latitude regions. A comparative study of the performances of EOF, NLRA, ANN, and IRI models to estimate TEC during geomagnetic storm conditions over various latitudes showed that the ANN model is about 10 %, 26 %, and 58 % more accurate than EOF, NLRA, and IRI models, respectively, while EOF was found to perform 15 %, and 44 % better than NLRA and IRI, respectively. It was further found that the NLRA model is 25 % more accurate than the IRI model. We have also investigated for the first time, the role of meridional neutral winds (from the Horizontal Wind Model) to storm-time TEC modelling in the low latitude, northern and southern hemisphere mid-latitude regions of the African sector, based on ANN models. Statistics have shown that the inclusion of the meridional wind velocity in TEC modelling during geomagnetic storms leads to percentage improvements of about 5 % for the low latitude, 10 % and 5 % for the northern and southern hemisphere mid-latitude regions, respectively. High-latitude storm-induced winds and the inter-hemispheric blows of the meridional winds from summer to winter hemisphere have been suggested to be associated with these improvements.
- Full Text:
- Date Issued: 2019