Uses, knowledge, and management of the threatened pepper-bark tree (Warburgia salutaris) in southern Mozambique
- Senkoro, Annae M, Shackleton, Charlie M, Voeks, Robert A, Ribeiro, Ana I
- Authors: Senkoro, Annae M , Shackleton, Charlie M , Voeks, Robert A , Ribeiro, Ana I
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/177430 , vital:42821 , https://doi.org/10.1007/s12231-019-09468-x
- Description: Uses, Knowledge, and Management of the Threatened Pepper-Bark Tree (Warburgia salutaris) in Southern Mozambique.Warburgia salutaris, the pepper-bark tree, is one of the most highly valued medicinal plant species in southern Africa. Due to its popularity in folk medicine, it is overexploited in many regions and is deemed threatened throughout its range. We identified cultural and social drivers of use, compared knowledge distribution, determined management practices, and explored local ecological knowledge related to the species in the Lebombo Mountains, Tembe River, and Futi Corridor areas in southern Mozambique. Stratified random, semistructured interviews were conducted (182), complemented by 17 focus group discussions in the three study areas. W. salutaris was used medicinally to treat 12 health concerns, with the bark being the most commonly used part.
- Full Text:
- Date Issued: 2019
- Authors: Senkoro, Annae M , Shackleton, Charlie M , Voeks, Robert A , Ribeiro, Ana I
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/177430 , vital:42821 , https://doi.org/10.1007/s12231-019-09468-x
- Description: Uses, Knowledge, and Management of the Threatened Pepper-Bark Tree (Warburgia salutaris) in Southern Mozambique.Warburgia salutaris, the pepper-bark tree, is one of the most highly valued medicinal plant species in southern Africa. Due to its popularity in folk medicine, it is overexploited in many regions and is deemed threatened throughout its range. We identified cultural and social drivers of use, compared knowledge distribution, determined management practices, and explored local ecological knowledge related to the species in the Lebombo Mountains, Tembe River, and Futi Corridor areas in southern Mozambique. Stratified random, semistructured interviews were conducted (182), complemented by 17 focus group discussions in the three study areas. W. salutaris was used medicinally to treat 12 health concerns, with the bark being the most commonly used part.
- Full Text:
- Date Issued: 2019
Using a multi-method approach to understand the movement patterns and the associated environmental correlates of an iconic West African recreational fish
- Authors: Winkler, Alexander Claus
- Date: 2019
- Subjects: Carangidae fishing , Carangidae -- Migration , Carangidae -- Namibia , Carangidae -- Angola , Fish tagging , Carangidae -- Benguela Current , Underwater acoustic telemetry , Ocean temperature -- Physiological effect , Fishes -- Effect of temperature on
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/76530 , vital:30597
- Description: The leerfish (Lichia amia), is a large, primarily coastal recreational fish species with a distribution extending from Portugal down the west coast of African to southern Mozambique. Owing to its large size (30 kg), strong fighting abilities and habit of taking surface artificial lures, this species has taken on an iconic stature among shore-based recreational anglers. Its reputation has made it an important angling tourism species that makes an important contribution to the economy of developing countries. For example, the species brought US$243 per harvested kilogramme into the local southern Angola economy. Despite its high value, little is known about its movement patterns in the northern Benguela coastal region, a region which includes southern Angola and northern Namibia. While much is known about the migratory patterns of the South African stock of L. amia, recent molecular studies have shown that the northern Benguela stock of L. amia has been isolated from the South African population for at least two million years, a consequence of the development of the cold Lüderitz upwelling cell in southern Namibia. Although the global population of L. amia is considered a single species, prominent biogeographic barriers within its distribution and subtle morphological differences between specimens captured within its tropical versus warm-temperate distribution suggest otherwise. A multi-method approach incorporating passive acoustic telemetry (PAT), recreational catch-per-unit-effort (CPUE) and conventional tagging (CT) in southern Angola, as well as recreational fisher-ecological knowledge (FEK) from Namibia, was used to investigate the large-scale movement patterns of L. amia within the northern Benguela coastal region. While each method had its own associated limitations, the combination provided a holistic picture of the population's seasonal migratory patterns. Furthermore, PAT successfully identified partial migration with 25% vs 75% of monitored fish exhibiting resident (movements < 100 km) or migratory (movements > 100 km) behaviour, respectively. Further behavioural diversity was observed with ‘resident’, ‘roaming’ and ‘embayment’ contingents identified based on varying levels of affinity to certain habitats. The presence of both resident and migratory individuals within the northernmost study during June and July, combined with available biological information, suggested that area-specific spawning may take place. While PAT, CPUE and CT largely aligned in determining area specific high-area use, results from network analyses and mixed effects models conducted on the PAT data supported the spawning hypothesis, with anomalous behaviour around specific receivers during the spawning season. All fish, regardless of behavioural contingent, displayed similar movement behaviour during the spawning season and this was driven by factors generally associated with reproduction, such as lunar illumination. Interestingly, these drivers were different from those that determined the area specific use of individuals outside of the spawning season. The environmental drivers of longshore migration into the northern study site were identified as a decline in water temperature and shorter day lengths. The results of this study highlight the importance of using a multi-method approach in determining migratory movement behaviour, area specific area use, and stock structure of key fisheries species. The identification of different behavioural contingents highlights the importance of acknowledging individual variation in movement and habitat-use patterns. This is particularly relevant as future climate change and spatiotemporal variation in fishing effort may artificially skew natural selection processes to favour certain behavioural groups. This study also highlighted the importance of scientists forming relationships with resource-users, such as recreational angling lodges in areas where limited research has been conducted. This is particularly relevant within the West African context where little is known about many of the fish species that are being increasingly targeted by tourism angling ventures.
- Full Text:
- Date Issued: 2019
- Authors: Winkler, Alexander Claus
- Date: 2019
- Subjects: Carangidae fishing , Carangidae -- Migration , Carangidae -- Namibia , Carangidae -- Angola , Fish tagging , Carangidae -- Benguela Current , Underwater acoustic telemetry , Ocean temperature -- Physiological effect , Fishes -- Effect of temperature on
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/76530 , vital:30597
- Description: The leerfish (Lichia amia), is a large, primarily coastal recreational fish species with a distribution extending from Portugal down the west coast of African to southern Mozambique. Owing to its large size (30 kg), strong fighting abilities and habit of taking surface artificial lures, this species has taken on an iconic stature among shore-based recreational anglers. Its reputation has made it an important angling tourism species that makes an important contribution to the economy of developing countries. For example, the species brought US$243 per harvested kilogramme into the local southern Angola economy. Despite its high value, little is known about its movement patterns in the northern Benguela coastal region, a region which includes southern Angola and northern Namibia. While much is known about the migratory patterns of the South African stock of L. amia, recent molecular studies have shown that the northern Benguela stock of L. amia has been isolated from the South African population for at least two million years, a consequence of the development of the cold Lüderitz upwelling cell in southern Namibia. Although the global population of L. amia is considered a single species, prominent biogeographic barriers within its distribution and subtle morphological differences between specimens captured within its tropical versus warm-temperate distribution suggest otherwise. A multi-method approach incorporating passive acoustic telemetry (PAT), recreational catch-per-unit-effort (CPUE) and conventional tagging (CT) in southern Angola, as well as recreational fisher-ecological knowledge (FEK) from Namibia, was used to investigate the large-scale movement patterns of L. amia within the northern Benguela coastal region. While each method had its own associated limitations, the combination provided a holistic picture of the population's seasonal migratory patterns. Furthermore, PAT successfully identified partial migration with 25% vs 75% of monitored fish exhibiting resident (movements < 100 km) or migratory (movements > 100 km) behaviour, respectively. Further behavioural diversity was observed with ‘resident’, ‘roaming’ and ‘embayment’ contingents identified based on varying levels of affinity to certain habitats. The presence of both resident and migratory individuals within the northernmost study during June and July, combined with available biological information, suggested that area-specific spawning may take place. While PAT, CPUE and CT largely aligned in determining area specific high-area use, results from network analyses and mixed effects models conducted on the PAT data supported the spawning hypothesis, with anomalous behaviour around specific receivers during the spawning season. All fish, regardless of behavioural contingent, displayed similar movement behaviour during the spawning season and this was driven by factors generally associated with reproduction, such as lunar illumination. Interestingly, these drivers were different from those that determined the area specific use of individuals outside of the spawning season. The environmental drivers of longshore migration into the northern study site were identified as a decline in water temperature and shorter day lengths. The results of this study highlight the importance of using a multi-method approach in determining migratory movement behaviour, area specific area use, and stock structure of key fisheries species. The identification of different behavioural contingents highlights the importance of acknowledging individual variation in movement and habitat-use patterns. This is particularly relevant as future climate change and spatiotemporal variation in fishing effort may artificially skew natural selection processes to favour certain behavioural groups. This study also highlighted the importance of scientists forming relationships with resource-users, such as recreational angling lodges in areas where limited research has been conducted. This is particularly relevant within the West African context where little is known about many of the fish species that are being increasingly targeted by tourism angling ventures.
- Full Text:
- Date Issued: 2019
Using a reading club to help grade 4 boys, in the kingdom of Saudi Arabia, to position themselves as readers
- Authors: Jansen, Lincoln Lee
- Date: 2019
- Subjects: Boys -- Books and reading -- Saudi Arabia , Reading -- Sex differences -- Saudi Arabia Book clubs (Discussion groups) -- Saudi Arabia Group reading -- Saudi Arabia Reading (Elementary) -- Saudi Arabia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/42285 , vital:36642
- Description: Widespread research exists about the challenges of getting boys to read and the gap in reading performance between boys and girls. Using a case study design within a qualitative approach, this study investigated whether engagement in a reading club could help boys in the Kingdom of Saudi Arabia to position themselves as readers. The literature review examined factors that hindered or advanced reading and the reading development of boys, particular in the Arab-Muslim context. Two theoretical frameworks underpin this study: Social Learning Theory which allowed for reading engagement of a social nature and Third Space Theory which enabled this engagement bringing together the in and out of school literacy practices. Grade 4 students at a school in Saudi Arabia were invited to partake in a 45 minute after-school reading club for 12 consecutive weeks. Participatory Visual Methodologies and a Reflective journal were used to generate data. Participants were asked to make drawings to express how they felt about reading in different languages and drawings to express how they felt about reading English books in a reading club. Drawings accompanied by verbal feedback along with the reflective journal notes were analysed using thematic analysis. Results from this study showed that a reading club serving as a socially supportive space does help boys in the Kingdom of Saudi Arabia to position themselves as readers.
- Full Text:
- Date Issued: 2019
- Authors: Jansen, Lincoln Lee
- Date: 2019
- Subjects: Boys -- Books and reading -- Saudi Arabia , Reading -- Sex differences -- Saudi Arabia Book clubs (Discussion groups) -- Saudi Arabia Group reading -- Saudi Arabia Reading (Elementary) -- Saudi Arabia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/42285 , vital:36642
- Description: Widespread research exists about the challenges of getting boys to read and the gap in reading performance between boys and girls. Using a case study design within a qualitative approach, this study investigated whether engagement in a reading club could help boys in the Kingdom of Saudi Arabia to position themselves as readers. The literature review examined factors that hindered or advanced reading and the reading development of boys, particular in the Arab-Muslim context. Two theoretical frameworks underpin this study: Social Learning Theory which allowed for reading engagement of a social nature and Third Space Theory which enabled this engagement bringing together the in and out of school literacy practices. Grade 4 students at a school in Saudi Arabia were invited to partake in a 45 minute after-school reading club for 12 consecutive weeks. Participatory Visual Methodologies and a Reflective journal were used to generate data. Participants were asked to make drawings to express how they felt about reading in different languages and drawings to express how they felt about reading English books in a reading club. Drawings accompanied by verbal feedback along with the reflective journal notes were analysed using thematic analysis. Results from this study showed that a reading club serving as a socially supportive space does help boys in the Kingdom of Saudi Arabia to position themselves as readers.
- Full Text:
- Date Issued: 2019
Using a social-ecological systems approach to investigate hillslope seep wetlands ecosystem structure and functionality in the Tsitsa River catchment, Eastern Cape, South Africa
- Authors: Libala, Notiswa
- Date: 2019
- Subjects: Wetland management -- South Africa -- Eastern Cape , Wetland ecology -- South Africa -- Eastern Cape , Wetland conservation -- South Africa -- Eastern Cape , Slopes (Physical geography) -- South Africa -- Eastern Cape , Vegetation management -- South Africa -- Tsitsa River Catchment , Land degradation -- Control -- South Africa -- Tsitsa River Catchment , Grazing -- Environmental aspects -- South Africa -- Tsitsa River Catchment , Ecosystem management -- South Africa -- Tsitsa River Catchment , Wetland plants -- Effect of grazing on
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/115936 , vital:34270
- Description: Wetlands are critical ecosystems that can provide services of great social, economic and environmental value to the society. Yet, in South Africa, hillslope seep wetlands are among the most threatened ecosystems due to human-induced activities and are disappearing rapidly. Further, despite the potential vulnerability of hillslope seep wetland to disturbances, and their criticality in relation to all year round provision of forage for livestock grazing, they are among the most poorly studied wetland systems. Using a social-ecological system framing, and drawing on a range of ecological and social sciences methods, this study shed light on ways in which an integrative approach can contribute to sustainable utilisation of hillslope seep wetlands in the Tsitsa River catchment in the Eastern Cape province of South Africa. The study specific objectives were to i) evaluate the performance of Floristic Quality Assessment Index (FQAI), WET-Health and Floristic Assessment Quotient for Wetlands Index (FQAWet) indices for assessing hillslope seep wetlands ecological health ii) develop a trait-based approach for assessing the potential resilience and vulnerability of hillslope seep wetland plant species to disturbances, iii) assess the role of hillslope seep wetlands in the local communities in relation to livestock, and explore understanding of local people about the value of hillslope seep wetlands, iv) demonstrate collaborative insights emerging from an integrative social-ecological system research process to inform sustainable management of hillslope seep wetlands. A total of 11 hillslope seep wetlands were visually classified based on the level of erosion. Plant species composition within the wetlands was determined along a 100 m line transects across the hillslope wetland sites. 5 quadrats of 0.2m2 were also placed along transect for vegetation collection and cover. The plant species collected were used to calculate (FQAI) and FQAWet scores to evaluate the condition of hillslope seep wetlands. The degree of human disturbances was assessed using the Anthropogenic Activity Index (AAI), an index for qualitatively assessing the degree of human disturbance based on visual inspection of a wetland site. Factors represented in the AAI, include: (i) surrounding land use intensity; (ii) soil disturbance; (iii) hydrological alteration; (iv) habitat alteration within wetland; (v) vegetation community quality. The vegetation samples were collected in summer 2016 and winter 2017. All assessed indices were regressed against AAI to evaluate their performances. All assessed indices FQAI, FQAWet and WET-Health showed that hillslope seep wetland were impacted by human activities. FQAIall and WET-Health showed the strongest response to AAI in winter, while FQAIdom and FAQWet showed a weak response to AAI in all seasons. Overall, the findings of this study suggest that FQAIall and WET-Health are potentially better tools for assessing the biological conditions of hillslope seep wetland in South Africa. A novel trait-based approach was developed using seven plant traits and 27 trait attributes. Based on the developed approach, plant species were grouped into three potentially vulnerable groups in relation to grazing pressure. It was then predicted that species belonging to the highly vulnerable group would be less dominant at the highly disturbed sites, as well as in the winter season when grazing pressure is at its highest. The result corresponds largely with the seasonal predictions; however this was not the case for sites. The approach developed in this study worked and it was useful for predicting the potential responses of plant species in hillslope seep wetlands to grazing pressure. The success of the approach seasonally could be attributed to the careful selection of the traits, reflecting the mechanistic relationship between the grazing mode of stress on vegetation and trait-mediated biotic response. However, this still need to be refined using accurate vegetation cover methods that might have had impact on the lack of correspondence within sites. The results of the present study revealed that communities largely perceive hillslope seep wetlands as important ecosystems for their livelihoods. They recognise that the importance stems from services provided by the wetlands, particularly for livestock grazing during the dry season. Although hillslope seep wetlands are viewed as important ecosystems for livelihoods, the communities also perceive these wetlands as highly eroded ecosystems. Community members indicate willingness to strengthen local natural resource governance systems, which could lead to better management of hillslope seep wetlands. A range of protective strategies for hillslope seep were suggested by community members, including fencing, active herding and rotational grazing. The study suggests that active involvement of local communities is critical to the successful management of natural resources. The study highlights the need to consider the role of local people as influential components within social-ecological systems in order to promote effective management and conservation interventions of hillslope seep wetlands. Overall, the study highlights the criticality of an integrative social-ecological system approach for holistic management of hillslope seep wetlands within the studied catchment.
- Full Text:
- Date Issued: 2019
- Authors: Libala, Notiswa
- Date: 2019
- Subjects: Wetland management -- South Africa -- Eastern Cape , Wetland ecology -- South Africa -- Eastern Cape , Wetland conservation -- South Africa -- Eastern Cape , Slopes (Physical geography) -- South Africa -- Eastern Cape , Vegetation management -- South Africa -- Tsitsa River Catchment , Land degradation -- Control -- South Africa -- Tsitsa River Catchment , Grazing -- Environmental aspects -- South Africa -- Tsitsa River Catchment , Ecosystem management -- South Africa -- Tsitsa River Catchment , Wetland plants -- Effect of grazing on
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/115936 , vital:34270
- Description: Wetlands are critical ecosystems that can provide services of great social, economic and environmental value to the society. Yet, in South Africa, hillslope seep wetlands are among the most threatened ecosystems due to human-induced activities and are disappearing rapidly. Further, despite the potential vulnerability of hillslope seep wetland to disturbances, and their criticality in relation to all year round provision of forage for livestock grazing, they are among the most poorly studied wetland systems. Using a social-ecological system framing, and drawing on a range of ecological and social sciences methods, this study shed light on ways in which an integrative approach can contribute to sustainable utilisation of hillslope seep wetlands in the Tsitsa River catchment in the Eastern Cape province of South Africa. The study specific objectives were to i) evaluate the performance of Floristic Quality Assessment Index (FQAI), WET-Health and Floristic Assessment Quotient for Wetlands Index (FQAWet) indices for assessing hillslope seep wetlands ecological health ii) develop a trait-based approach for assessing the potential resilience and vulnerability of hillslope seep wetland plant species to disturbances, iii) assess the role of hillslope seep wetlands in the local communities in relation to livestock, and explore understanding of local people about the value of hillslope seep wetlands, iv) demonstrate collaborative insights emerging from an integrative social-ecological system research process to inform sustainable management of hillslope seep wetlands. A total of 11 hillslope seep wetlands were visually classified based on the level of erosion. Plant species composition within the wetlands was determined along a 100 m line transects across the hillslope wetland sites. 5 quadrats of 0.2m2 were also placed along transect for vegetation collection and cover. The plant species collected were used to calculate (FQAI) and FQAWet scores to evaluate the condition of hillslope seep wetlands. The degree of human disturbances was assessed using the Anthropogenic Activity Index (AAI), an index for qualitatively assessing the degree of human disturbance based on visual inspection of a wetland site. Factors represented in the AAI, include: (i) surrounding land use intensity; (ii) soil disturbance; (iii) hydrological alteration; (iv) habitat alteration within wetland; (v) vegetation community quality. The vegetation samples were collected in summer 2016 and winter 2017. All assessed indices were regressed against AAI to evaluate their performances. All assessed indices FQAI, FQAWet and WET-Health showed that hillslope seep wetland were impacted by human activities. FQAIall and WET-Health showed the strongest response to AAI in winter, while FQAIdom and FAQWet showed a weak response to AAI in all seasons. Overall, the findings of this study suggest that FQAIall and WET-Health are potentially better tools for assessing the biological conditions of hillslope seep wetland in South Africa. A novel trait-based approach was developed using seven plant traits and 27 trait attributes. Based on the developed approach, plant species were grouped into three potentially vulnerable groups in relation to grazing pressure. It was then predicted that species belonging to the highly vulnerable group would be less dominant at the highly disturbed sites, as well as in the winter season when grazing pressure is at its highest. The result corresponds largely with the seasonal predictions; however this was not the case for sites. The approach developed in this study worked and it was useful for predicting the potential responses of plant species in hillslope seep wetlands to grazing pressure. The success of the approach seasonally could be attributed to the careful selection of the traits, reflecting the mechanistic relationship between the grazing mode of stress on vegetation and trait-mediated biotic response. However, this still need to be refined using accurate vegetation cover methods that might have had impact on the lack of correspondence within sites. The results of the present study revealed that communities largely perceive hillslope seep wetlands as important ecosystems for their livelihoods. They recognise that the importance stems from services provided by the wetlands, particularly for livestock grazing during the dry season. Although hillslope seep wetlands are viewed as important ecosystems for livelihoods, the communities also perceive these wetlands as highly eroded ecosystems. Community members indicate willingness to strengthen local natural resource governance systems, which could lead to better management of hillslope seep wetlands. A range of protective strategies for hillslope seep were suggested by community members, including fencing, active herding and rotational grazing. The study suggests that active involvement of local communities is critical to the successful management of natural resources. The study highlights the need to consider the role of local people as influential components within social-ecological systems in order to promote effective management and conservation interventions of hillslope seep wetlands. Overall, the study highlights the criticality of an integrative social-ecological system approach for holistic management of hillslope seep wetlands within the studied catchment.
- Full Text:
- Date Issued: 2019
Using camera traps to generate a species inventory for medium-sized and large mammals in South West Zimbabwe:
- Welch, Rebecca J, Grant, Tanith, Parker, Daniel M
- Authors: Welch, Rebecca J , Grant, Tanith , Parker, Daniel M
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150267 , vital:38955 , https://0-doi.org.wam.seals.ac.za/10.3957/056.049.0089
- Description: We investigated the presence of medium-sized and large mammals utilizing by-catch data from a camera trapping survey in the Mangwe District in South West Zimbabwe, an unprotected commercial livestock farming area which is impacted by human encroachment, poaching and trophy hunting. The camera trapping survey was carried out from 23 October to 5 December 2009, covered an area of 200 km2 and was initially intended to estimate the population density of leopards (Panthera pardus). The study area was split into two contiguous subsections, with each section sampled for a total of 20 days using 20 cameras. Camera trap photographs were identified to species level, then compared to a list of species thought to occur in the area according to available literature, as well as sightings from professional hunters and local landowners.
- Full Text:
- Date Issued: 2019
- Authors: Welch, Rebecca J , Grant, Tanith , Parker, Daniel M
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150267 , vital:38955 , https://0-doi.org.wam.seals.ac.za/10.3957/056.049.0089
- Description: We investigated the presence of medium-sized and large mammals utilizing by-catch data from a camera trapping survey in the Mangwe District in South West Zimbabwe, an unprotected commercial livestock farming area which is impacted by human encroachment, poaching and trophy hunting. The camera trapping survey was carried out from 23 October to 5 December 2009, covered an area of 200 km2 and was initially intended to estimate the population density of leopards (Panthera pardus). The study area was split into two contiguous subsections, with each section sampled for a total of 20 days using 20 cameras. Camera trap photographs were identified to species level, then compared to a list of species thought to occur in the area according to available literature, as well as sightings from professional hunters and local landowners.
- Full Text:
- Date Issued: 2019
Using captive seabirds to assess knowledge gaps in stable isotope analysis of diets
- Authors: Micklem, Isabel Andrea
- Date: 2019
- Subjects: Stable isotopes -- Analysis African penguin -- South Africa Breeding
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65101 , vital:28686
- Description: Stable isotope (SI) ratios of carbon (δ13C) and nitrogen (δ15N) are now widely used as biomarkers in ecological studies to provide information about food web structuring. However, understanding trophic relationships using SI analysis requires not only knowledge of SI values of predator and prey, but also accurate discrimination factors (DFs), which can differ among species and by physiological state. This thesis examined three questions using captive birds from the South African Foundation for the Conservation of Coastal Birds (SANCCOB). First, the effects of ontogeny on δ13C and δ15N ratios of African penguins (Spheniscus demersus) were assessed. Blood samples were collected from penguins in four age classes (P3 chicks, blues, juveniles and adults) concurrently with their diet (sardine (Sardinops sagax) and formula). Second, to assess the influence of breeding physiology on SI ratios, the blood of ten breeding pairs of penguins was sampled over a five-month period from June to October 2016. Following laying, each pair was categorised into one of three (four for whole blood) egg production phases (initial yolk deposition, rapid yolk deposition and post-laying) and their influences on SI ratios were tested. Third, species differences in DFs were evaluated for African penguins, kelp and Hartlaub’s gulls (Larus dominicanus and L. hartlaubii), greater crested terns (Thalasseus bergii) and Cape cormorants (Phalacrocorax capensis). Flying birds were mostly fed sardine with a small but unknown amount of sardinella (Sardinella aurita), DFs were therefore estimated for a 50:50 sardine:sardinella diet, a 75:25 sardine:sardinella diet and a 100% sardine diet for each flying bird species. The DFs were assessed for the whole blood (WB), red blood cells (RBC), plasma (PL) and delipidated plasma of the penguins, and only WB for the flying birds as well as flesh, whole fish, delipidated flesh and delipidated whole fish for fish species, and for formula. Results indicated that age influenced both the δ13C and δ15N of WB, only the δ15N of RBC and the δ13C of delipidated PL. The assessment of breeding physiology yielded a significant interaction between the effects of egg production phase and sex on the δ13C of WB; females had significantly lower δ13C in the rapid yolk deposition phase than the other two phases and all males. The δ13C of PL was affected only by sex, with females having a significantly lower δ13C value than males. Neither physiological state nor sex influenced the other blood components. Differences were found among the three DFs in the non-penguin species, but not for all consumer – prey tissue combinations. There were also significant differences among species with a DF calculated from a diet with the most probable prey proportions eaten. Depending on the combination of consumer and prey tissue used to calculate the DF, a different conclusion regarding trophic information can be reached. A literature review updated with the present data showed that no general pattern or grouping of similar species with regards to DF values could be drawn, highlighting the importance of determining species- and tissue-specific DFs. Thus age, egg production, tissue and species all influenced the SI values of bird blood and therefore their DFs. Not all physiological conditions affect all blood components in the same way, making different components more or less sensitive to physiological influences. Though their influence is at a small enough scale that it is unlikely to hamper correct conclusion in ecological studies, it is crucial that these factors are considered when using SI analysis (SIA). When uncertainties exist for some coefficients in wild studies, SIA should therefore be combined to other dietary techniques to determine the food web structure as best as possible.
- Full Text:
- Date Issued: 2019
- Authors: Micklem, Isabel Andrea
- Date: 2019
- Subjects: Stable isotopes -- Analysis African penguin -- South Africa Breeding
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65101 , vital:28686
- Description: Stable isotope (SI) ratios of carbon (δ13C) and nitrogen (δ15N) are now widely used as biomarkers in ecological studies to provide information about food web structuring. However, understanding trophic relationships using SI analysis requires not only knowledge of SI values of predator and prey, but also accurate discrimination factors (DFs), which can differ among species and by physiological state. This thesis examined three questions using captive birds from the South African Foundation for the Conservation of Coastal Birds (SANCCOB). First, the effects of ontogeny on δ13C and δ15N ratios of African penguins (Spheniscus demersus) were assessed. Blood samples were collected from penguins in four age classes (P3 chicks, blues, juveniles and adults) concurrently with their diet (sardine (Sardinops sagax) and formula). Second, to assess the influence of breeding physiology on SI ratios, the blood of ten breeding pairs of penguins was sampled over a five-month period from June to October 2016. Following laying, each pair was categorised into one of three (four for whole blood) egg production phases (initial yolk deposition, rapid yolk deposition and post-laying) and their influences on SI ratios were tested. Third, species differences in DFs were evaluated for African penguins, kelp and Hartlaub’s gulls (Larus dominicanus and L. hartlaubii), greater crested terns (Thalasseus bergii) and Cape cormorants (Phalacrocorax capensis). Flying birds were mostly fed sardine with a small but unknown amount of sardinella (Sardinella aurita), DFs were therefore estimated for a 50:50 sardine:sardinella diet, a 75:25 sardine:sardinella diet and a 100% sardine diet for each flying bird species. The DFs were assessed for the whole blood (WB), red blood cells (RBC), plasma (PL) and delipidated plasma of the penguins, and only WB for the flying birds as well as flesh, whole fish, delipidated flesh and delipidated whole fish for fish species, and for formula. Results indicated that age influenced both the δ13C and δ15N of WB, only the δ15N of RBC and the δ13C of delipidated PL. The assessment of breeding physiology yielded a significant interaction between the effects of egg production phase and sex on the δ13C of WB; females had significantly lower δ13C in the rapid yolk deposition phase than the other two phases and all males. The δ13C of PL was affected only by sex, with females having a significantly lower δ13C value than males. Neither physiological state nor sex influenced the other blood components. Differences were found among the three DFs in the non-penguin species, but not for all consumer – prey tissue combinations. There were also significant differences among species with a DF calculated from a diet with the most probable prey proportions eaten. Depending on the combination of consumer and prey tissue used to calculate the DF, a different conclusion regarding trophic information can be reached. A literature review updated with the present data showed that no general pattern or grouping of similar species with regards to DF values could be drawn, highlighting the importance of determining species- and tissue-specific DFs. Thus age, egg production, tissue and species all influenced the SI values of bird blood and therefore their DFs. Not all physiological conditions affect all blood components in the same way, making different components more or less sensitive to physiological influences. Though their influence is at a small enough scale that it is unlikely to hamper correct conclusion in ecological studies, it is crucial that these factors are considered when using SI analysis (SIA). When uncertainties exist for some coefficients in wild studies, SIA should therefore be combined to other dietary techniques to determine the food web structure as best as possible.
- Full Text:
- Date Issued: 2019
Using four different methods to reach a taxonomic conclusion in dung beetles (Scarabaeinae)
- Authors: Deschodt, Christian Michel
- Date: 2019
- Subjects: Dung beetles -- Classification , Scarabaeidae -- Classification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67845 , vital:29156
- Description: Four different techniques to make taxonomic decisions concerning different species in Scarabaeinae are being investigated. Firstly, I made measurements of the body dimensions which are plotted on a two dimensional graph. This method is successfully used to erect one new species, Copris crassus Deschodt and Davis, 2015, and to establish the synonymy of Copris bihamatus Balthasar, 1965 with Copris fidius (Olivier, 1789). Thereafter the classical or traditional comparative method is used to propose seven new species Scarabaeolus soutpansbergensis (Deschodt and Davis 2015), Scarabaeolus megaparvulus (Davis and Deschodt 2015), Scarabaeolus niemandi (Deschodt and Davis 2015), Scarabaeolus carniphilus (Davis and Deschodt 2015), Scarabaeolus ermienae (Deschodt and Davis 2015), Scarabaeolus planipennis (Davis and Deschodt 2015) and Scarabaeolus afronitidus (Davis and Deschodt 2015) and formally synonymise Scarabaeolus vansoni (Ferreira, 1958) with Scarabaeolus lucidulus (Boheman, 1860) and Scarabaeolus xavieri (Ferreira, 1968) with Scarabaeolus andreaei (zur Strassen, 1963). Morphometric measurements of external structures of a group of flightless relict beetles in the tribe Canthonini are used to compile a nexus file which is analysed with computer software. The interpretation of these results is used here to support the erection of a new genus Drogo Deschodt, Davis & Scholtz 2016, Lastly I analysed the DNA sequences of specimens from different species belonging to a species complex in the genus Epirinus Reiche, 1841 occurring over a wide geographic range. These sequences are used together with external morphological characters to propose the synonymy of Epirinus hluhluwensis Medina & Scholtz 2005 and Epirinus ngomae Medina & Scholtz 2005 with Epirinus davisi Scholtz & Howden 1987.
- Full Text:
- Date Issued: 2019
- Authors: Deschodt, Christian Michel
- Date: 2019
- Subjects: Dung beetles -- Classification , Scarabaeidae -- Classification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67845 , vital:29156
- Description: Four different techniques to make taxonomic decisions concerning different species in Scarabaeinae are being investigated. Firstly, I made measurements of the body dimensions which are plotted on a two dimensional graph. This method is successfully used to erect one new species, Copris crassus Deschodt and Davis, 2015, and to establish the synonymy of Copris bihamatus Balthasar, 1965 with Copris fidius (Olivier, 1789). Thereafter the classical or traditional comparative method is used to propose seven new species Scarabaeolus soutpansbergensis (Deschodt and Davis 2015), Scarabaeolus megaparvulus (Davis and Deschodt 2015), Scarabaeolus niemandi (Deschodt and Davis 2015), Scarabaeolus carniphilus (Davis and Deschodt 2015), Scarabaeolus ermienae (Deschodt and Davis 2015), Scarabaeolus planipennis (Davis and Deschodt 2015) and Scarabaeolus afronitidus (Davis and Deschodt 2015) and formally synonymise Scarabaeolus vansoni (Ferreira, 1958) with Scarabaeolus lucidulus (Boheman, 1860) and Scarabaeolus xavieri (Ferreira, 1968) with Scarabaeolus andreaei (zur Strassen, 1963). Morphometric measurements of external structures of a group of flightless relict beetles in the tribe Canthonini are used to compile a nexus file which is analysed with computer software. The interpretation of these results is used here to support the erection of a new genus Drogo Deschodt, Davis & Scholtz 2016, Lastly I analysed the DNA sequences of specimens from different species belonging to a species complex in the genus Epirinus Reiche, 1841 occurring over a wide geographic range. These sequences are used together with external morphological characters to propose the synonymy of Epirinus hluhluwensis Medina & Scholtz 2005 and Epirinus ngomae Medina & Scholtz 2005 with Epirinus davisi Scholtz & Howden 1987.
- Full Text:
- Date Issued: 2019
Using GIS and Remote Sensing to identify water-stressed areas in South Africa - A case study of the Raymond Mhlaba Local Municipality, Eastern Cape Province
- Authors: Malunda, Kasongo Benjamin
- Date: 2019
- Subjects: Water-supply Droughts
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/17238 , vital:40868
- Description: The main purpose of this study is to identify water stressed areas as a response to climate variability (Drought), Aridity, and water exploitation in the Raymond Mhlaba Local Municipality (RMLM) using Geographical Information Systems (GIS) and Remote Sensing (RS). This study focused on evaluating whether it is best to address the issue of drought and water stress as a municipal problem instead of a community-based problem. To achieve this, the study was attempting to establish four things: the climate condition of the municipality, whether the municipality is a drought prone area, how the surface water is being exploited in the municipality, and identify areas that should be considered water stressed areas. There are several indices used to compute water stress and the study opted for indices that can monitor climate variability, and surface water resources. Therefore, the de Martone Aridity Index (MA) was used to compute the aridity of the municipality the Standardized Precipitation Evapotranspiration Index (SPEI) to compute drought, and the Water Exploitation Index (WEI) to measure population water exploitation. Data used was from 25 weather stations provided by the Meteoblue website and water data from the department of water and sanitation. Thereafter, the Analytical Hierarchy Process (AHP) was used to determine the weights of each variables’ contribution to water stress. For validation, the Shapiro, Jarqua Bera and Kolmogorov-Smirnov tests were used and results showed that the data was normally distributed and a two-sample t-test confirmed that there was no significant difference between the measured and simulated data. According to the de Martonne there are three main climatic regions in the Raymond Mhlaba Municipality namely: the Mediterranean, semi-humid and humid region. The Mediterranean region is equally prone to drought as the humid region while the semi-humid region was a wet prone. This was contradictory to literature that expected drier regions to experience more frequent drought. However, this may have been influenced by the number of weather points that cover the humid region that is far lower than the ones covering the Mediterranean region. In addition, the municipality is 50% drought prone and would experience extreme events about 30% of the time. The study discovered that towns such as Fort Beaufort, Alice, Adelaide, and Middle drift are water stressed areas. While most of the other regions are low water users. These challenges with water stress could be reduced with the implementation of water saving mechanisms such as water tanks and the avoidance of addressing water stress as municipal challenges as opposed to a town specific challenge.
- Full Text:
- Date Issued: 2019
- Authors: Malunda, Kasongo Benjamin
- Date: 2019
- Subjects: Water-supply Droughts
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/17238 , vital:40868
- Description: The main purpose of this study is to identify water stressed areas as a response to climate variability (Drought), Aridity, and water exploitation in the Raymond Mhlaba Local Municipality (RMLM) using Geographical Information Systems (GIS) and Remote Sensing (RS). This study focused on evaluating whether it is best to address the issue of drought and water stress as a municipal problem instead of a community-based problem. To achieve this, the study was attempting to establish four things: the climate condition of the municipality, whether the municipality is a drought prone area, how the surface water is being exploited in the municipality, and identify areas that should be considered water stressed areas. There are several indices used to compute water stress and the study opted for indices that can monitor climate variability, and surface water resources. Therefore, the de Martone Aridity Index (MA) was used to compute the aridity of the municipality the Standardized Precipitation Evapotranspiration Index (SPEI) to compute drought, and the Water Exploitation Index (WEI) to measure population water exploitation. Data used was from 25 weather stations provided by the Meteoblue website and water data from the department of water and sanitation. Thereafter, the Analytical Hierarchy Process (AHP) was used to determine the weights of each variables’ contribution to water stress. For validation, the Shapiro, Jarqua Bera and Kolmogorov-Smirnov tests were used and results showed that the data was normally distributed and a two-sample t-test confirmed that there was no significant difference between the measured and simulated data. According to the de Martonne there are three main climatic regions in the Raymond Mhlaba Municipality namely: the Mediterranean, semi-humid and humid region. The Mediterranean region is equally prone to drought as the humid region while the semi-humid region was a wet prone. This was contradictory to literature that expected drier regions to experience more frequent drought. However, this may have been influenced by the number of weather points that cover the humid region that is far lower than the ones covering the Mediterranean region. In addition, the municipality is 50% drought prone and would experience extreme events about 30% of the time. The study discovered that towns such as Fort Beaufort, Alice, Adelaide, and Middle drift are water stressed areas. While most of the other regions are low water users. These challenges with water stress could be reduced with the implementation of water saving mechanisms such as water tanks and the avoidance of addressing water stress as municipal challenges as opposed to a town specific challenge.
- Full Text:
- Date Issued: 2019
Utilisation of Teaching and Learning Centres in State Universities in Zimbabwe: implications for teaching and learning
- Authors: Machingura, Viola
- Date: 2019
- Subjects: Active learning -- Zimbabwe , Education, Higher -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10353/12848 , vital:39384
- Description: The purpose of this research was to examine the utilisation of Teaching and Learning Centres (TLC) in state universities in Zimbabwe and the role they are playing in the improvement of teaching and learning in the institutions of higher learning. The social constructivist paradigm was found most appropriate for this study and was the lens by which reality was examined. The study used the qualitative approach and case study design to examine the issue under study. The purposive sampling technique was used to select participants who were rich informants for the study and these included Pro Vice Chancellors, Directors of Teaching and Learning Centres, Deans, lecturers and students. Data were collected through face to face interviews and focus group discussions that were triangulated by analysis of institutional records. The study was also guided by the theoretical lenses of the Social Practice Theory and the Concerns Based Adoption Model that provided the framework for the investigation. The study employed the Tech‘s qualitative model of data analysis that led to the findings being grouped into five major themes. The study established that Teaching and Learning Centres were not being fully utilised, thus were not helping to improve teaching and learning in a meaningful way in state universities in Zimbabwe. Possible reasons for this were the fact that the unit was not fully understood and different players at different levels in groups and as individuals had varied interpretations of what the TLCs were and what their role in the university was supposed to be. This lack of understanding and the absence of a shared understanding of what TLCs are and what they stand for, coupled with other factors such as the freeze on recruitment on staff in state universities and the assumed superiority of research over teaching for tenure and viii promotion, led to the poor positioning and poor staffing of TLCs leading to their poor utilisation in state universities. Each of the staff levels also had concerns about the utilisation of the TLC that made them reluctant to utilise it. The absence of top management support for the TLC, and the perceived superiority of research over teaching again led to poor utilisation of the unit. The study recommends the hosting of symposia between and among state universities for the dissemination of knowledge and information on what the TLC is and what its role should be. Internal consultations by individual state universities on the functions, staffing and positioning of the TLC and exposure for the TLC staff to established units to raise their knowledge and information levels and confidence is encouraged. Removal of the freeze on recruitment of staff so that TLCs can be better positioned and staffed and review of ZIMCHE guidelines to align teaching, research and university service for tenure and promotion would also help. Acquisition of cutting edge technology for teaching and learning and top management to listen to individual and group concerns and act on those that impede on TLC utilisation is a must.
- Full Text:
- Date Issued: 2019
- Authors: Machingura, Viola
- Date: 2019
- Subjects: Active learning -- Zimbabwe , Education, Higher -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10353/12848 , vital:39384
- Description: The purpose of this research was to examine the utilisation of Teaching and Learning Centres (TLC) in state universities in Zimbabwe and the role they are playing in the improvement of teaching and learning in the institutions of higher learning. The social constructivist paradigm was found most appropriate for this study and was the lens by which reality was examined. The study used the qualitative approach and case study design to examine the issue under study. The purposive sampling technique was used to select participants who were rich informants for the study and these included Pro Vice Chancellors, Directors of Teaching and Learning Centres, Deans, lecturers and students. Data were collected through face to face interviews and focus group discussions that were triangulated by analysis of institutional records. The study was also guided by the theoretical lenses of the Social Practice Theory and the Concerns Based Adoption Model that provided the framework for the investigation. The study employed the Tech‘s qualitative model of data analysis that led to the findings being grouped into five major themes. The study established that Teaching and Learning Centres were not being fully utilised, thus were not helping to improve teaching and learning in a meaningful way in state universities in Zimbabwe. Possible reasons for this were the fact that the unit was not fully understood and different players at different levels in groups and as individuals had varied interpretations of what the TLCs were and what their role in the university was supposed to be. This lack of understanding and the absence of a shared understanding of what TLCs are and what they stand for, coupled with other factors such as the freeze on recruitment on staff in state universities and the assumed superiority of research over teaching for tenure and viii promotion, led to the poor positioning and poor staffing of TLCs leading to their poor utilisation in state universities. Each of the staff levels also had concerns about the utilisation of the TLC that made them reluctant to utilise it. The absence of top management support for the TLC, and the perceived superiority of research over teaching again led to poor utilisation of the unit. The study recommends the hosting of symposia between and among state universities for the dissemination of knowledge and information on what the TLC is and what its role should be. Internal consultations by individual state universities on the functions, staffing and positioning of the TLC and exposure for the TLC staff to established units to raise their knowledge and information levels and confidence is encouraged. Removal of the freeze on recruitment of staff so that TLCs can be better positioned and staffed and review of ZIMCHE guidelines to align teaching, research and university service for tenure and promotion would also help. Acquisition of cutting edge technology for teaching and learning and top management to listen to individual and group concerns and act on those that impede on TLC utilisation is a must.
- Full Text:
- Date Issued: 2019
Utopia, dystopia, neo-utopia: three Generations of contemporary Artists in Angola. Atlantico: Contemporary Art in Angola and its diaspora today
- Authors: Siegert, Nadine
- Date: 2019
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/146332 , vital:38516 , ISBN 9789892088105
- Description: Book abstract. The book Atlantica: Contemporary Art from Angola and its Diaspora marks the start of publisher Hangar Books, specialising in publications within the context of contemporary arts, with particular incidence on southern epistemology.
- Full Text:
- Date Issued: 2019
- Authors: Siegert, Nadine
- Date: 2019
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/146332 , vital:38516 , ISBN 9789892088105
- Description: Book abstract. The book Atlantica: Contemporary Art from Angola and its Diaspora marks the start of publisher Hangar Books, specialising in publications within the context of contemporary arts, with particular incidence on southern epistemology.
- Full Text:
- Date Issued: 2019
Vacancy and unemployment analysis in South Africa
- Authors: Hamman, Nicolene
- Date: 2019
- Subjects: Job vacancies -- South Africa , Unemployment -- South Africa Job hunting -- South Africa Labor supply -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39621 , vital:35333
- Description: Ever since the transition post-1994, the South African economy have been faced with increasing unemployment rates, and an increasing labour force but not sufficient job opportunities to absorb these new entrants. Labour market conditions in South Africa can be considered tight after taking into account the high rates of unemployment and labour force participation. A unique empirical relationship surfaced within the macroeconomics context which had a significant impact on economic thinking. Beveridge (1944) postulated that there is a negative relationship between job vacancies and unemployment, and it is depicted by the Beveridge curve. This study therefore analysed the relationship between vacancies and unemployment in South Africa from 2008 to 2016. An autoregressive distributive lag (ARDL) model was employed to carry out the objectives of this study and the results suggested that there is a positive relationship between these two variables; which imply that the Beveridge curve theory does not apply to labour market of South Africa. This in turn suggests that labour demand and labour supply exists concurrently in this particular market. Thus, it is commendable for policy makers to have an in-depth introspection at the skills-supply, and the policies examining unemployment in South Africa to ensure that the unemployed fill the unfilled vacancies.
- Full Text:
- Date Issued: 2019
- Authors: Hamman, Nicolene
- Date: 2019
- Subjects: Job vacancies -- South Africa , Unemployment -- South Africa Job hunting -- South Africa Labor supply -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39621 , vital:35333
- Description: Ever since the transition post-1994, the South African economy have been faced with increasing unemployment rates, and an increasing labour force but not sufficient job opportunities to absorb these new entrants. Labour market conditions in South Africa can be considered tight after taking into account the high rates of unemployment and labour force participation. A unique empirical relationship surfaced within the macroeconomics context which had a significant impact on economic thinking. Beveridge (1944) postulated that there is a negative relationship between job vacancies and unemployment, and it is depicted by the Beveridge curve. This study therefore analysed the relationship between vacancies and unemployment in South Africa from 2008 to 2016. An autoregressive distributive lag (ARDL) model was employed to carry out the objectives of this study and the results suggested that there is a positive relationship between these two variables; which imply that the Beveridge curve theory does not apply to labour market of South Africa. This in turn suggests that labour demand and labour supply exists concurrently in this particular market. Thus, it is commendable for policy makers to have an in-depth introspection at the skills-supply, and the policies examining unemployment in South Africa to ensure that the unemployed fill the unfilled vacancies.
- Full Text:
- Date Issued: 2019
Values and workplace expectations of young graduates in the private sector
- Authors: Kriel, Caylin Jade
- Date: 2019
- Subjects: Generation Y -- Employment , Generation X -- Employment Intergenerational relations Group relations training Teams in the workplace Personnel management
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/40500 , vital:36177
- Description: Understanding the values and workplace expectations of young South African graduates, referred to in this study as Millennials, is vital for the future success of organisations. Organisations gain a competitive advantage by attracting, engaging and retaining top talent. Millennials are not always positively received in the workplace, due to the prevailing stereotypes held about this group. However, the Millennial generation has an important role to play in the workplace, both in contributing towards organisational success, and as future leaders. A greater understanding of this generation, more particularly in terms of their values and workplace expectations, is thus necessary for ensuring effective talent acquisition and management strategies. The aim of the study was to identify the values of Millennials, both within their personal and working lives. This is important; as individuals take their values into the workplace. Secondly, the expectations that Millennials have of their employers and workplaces in general was explored. With this understanding in mind, the purpose of the study was to advise organisations on how to better prepare for and accommodate Millennials’ values and workplace expectations, in order to enhance their role in contributing towards organisational success, as well as contributing towards their levels of engagement and job satisfaction. The study adopted a qualitative and phenomenological research design. The sample comprised eight young South African graduates working within the private sector, and residing in Port Elizabeth, within the Eastern Cape province of South Africa, who possessed an undergraduate tertiary qualification, and held at least one year’s work experience. It was further required that the participants fall within the Millennial generational cohort, aged between 22 and 30 years. The sampling technique used was non-probability purposive convenience sampling. One-on-one semi-structured interviews formed the data-collection instrument; and thematic analysis was used for the data processing and analysis. Congruence was identified between the values and the workplace expectations of young South African graduates in the private sector through the semi-structured interviews and the literature review; and between the identified values and the workplace expectations of the eight participants. This study contributes towards the field of knowledge used in describing the nature of the values and the workplace expectations of Millennials; and provides recommendations in terms of workplace implications.
- Full Text:
- Date Issued: 2019
- Authors: Kriel, Caylin Jade
- Date: 2019
- Subjects: Generation Y -- Employment , Generation X -- Employment Intergenerational relations Group relations training Teams in the workplace Personnel management
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/40500 , vital:36177
- Description: Understanding the values and workplace expectations of young South African graduates, referred to in this study as Millennials, is vital for the future success of organisations. Organisations gain a competitive advantage by attracting, engaging and retaining top talent. Millennials are not always positively received in the workplace, due to the prevailing stereotypes held about this group. However, the Millennial generation has an important role to play in the workplace, both in contributing towards organisational success, and as future leaders. A greater understanding of this generation, more particularly in terms of their values and workplace expectations, is thus necessary for ensuring effective talent acquisition and management strategies. The aim of the study was to identify the values of Millennials, both within their personal and working lives. This is important; as individuals take their values into the workplace. Secondly, the expectations that Millennials have of their employers and workplaces in general was explored. With this understanding in mind, the purpose of the study was to advise organisations on how to better prepare for and accommodate Millennials’ values and workplace expectations, in order to enhance their role in contributing towards organisational success, as well as contributing towards their levels of engagement and job satisfaction. The study adopted a qualitative and phenomenological research design. The sample comprised eight young South African graduates working within the private sector, and residing in Port Elizabeth, within the Eastern Cape province of South Africa, who possessed an undergraduate tertiary qualification, and held at least one year’s work experience. It was further required that the participants fall within the Millennial generational cohort, aged between 22 and 30 years. The sampling technique used was non-probability purposive convenience sampling. One-on-one semi-structured interviews formed the data-collection instrument; and thematic analysis was used for the data processing and analysis. Congruence was identified between the values and the workplace expectations of young South African graduates in the private sector through the semi-structured interviews and the literature review; and between the identified values and the workplace expectations of the eight participants. This study contributes towards the field of knowledge used in describing the nature of the values and the workplace expectations of Millennials; and provides recommendations in terms of workplace implications.
- Full Text:
- Date Issued: 2019
Vernacular radio and peace building in Kenya: a study of popular vernacular radio stations in three conflict-prone regions
- Authors: Kijana, Eunice Abuya
- Date: 2019
- Subjects: Radio journalism -- Kenya , Radio broadcasting -- Kenya Documentary radio programs Peace-building -- Social aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/42251 , vital:36639
- Description: In Kenya, just like in most African countries, ethnicity-related conflicts are a common phenomenon. Often times, the media, especially vernacular radio has been accused of incitement to violence as was in the case of 1994 Rwanda genocide and the 2007 post-election violence in Kenya. As a result, numerous studies have focused on the role that the media, especially vernacular radio plays in perpetuating ethnic conflict, while very little has been done to establish its role in peace building. Therefore, this study was informed by the assumption that the media is a double edged sword; while it can fuel tension and lead to conflict, it can also contribute to peace between conflicting parties. It therefore sought to establish the role that vernacular radio play in peace building in Kenya. The literature reviewed showed that vernacular radio has the potential to promote peace in society. The study was therefore guided by the social responsibility theory which underpins the necessity for the media/ journalist to keep society’s interest as a top priority. This means that the society expects journalists to be accountable, liable and responsible in carrying out their duties. This study utilized both qualitative and quantitative research methods. Using a case study of popular vernacular radio stations in three conflict prone regions in Kenya, the researcher employed content analysis, questionnaires and interviews as tools for data collection. The results indicate that the stations have put in place specific policies aimed at ensuring impartiality in reporting and that journalists adhere to them in their work. The stations also work in partnership with other peace practitioners by developing programs that are aimed at promoting peace within and between communities. Furthermore, the findings indicate that the stations’ journalists largely understand and comply with the sections of the Code of Conduct for the Practice of Journalism in Kenya which addresses the need for responsible conflict reporting. Based on these findings, the study therefore concludes that vernacular radio stations working in conflict prone regions in Kenya play a positive role in peace building. However, the study recommends more specialized trainings for journalists in order for these stations to be more effective in this role of peace building.
- Full Text:
- Date Issued: 2019
- Authors: Kijana, Eunice Abuya
- Date: 2019
- Subjects: Radio journalism -- Kenya , Radio broadcasting -- Kenya Documentary radio programs Peace-building -- Social aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/42251 , vital:36639
- Description: In Kenya, just like in most African countries, ethnicity-related conflicts are a common phenomenon. Often times, the media, especially vernacular radio has been accused of incitement to violence as was in the case of 1994 Rwanda genocide and the 2007 post-election violence in Kenya. As a result, numerous studies have focused on the role that the media, especially vernacular radio plays in perpetuating ethnic conflict, while very little has been done to establish its role in peace building. Therefore, this study was informed by the assumption that the media is a double edged sword; while it can fuel tension and lead to conflict, it can also contribute to peace between conflicting parties. It therefore sought to establish the role that vernacular radio play in peace building in Kenya. The literature reviewed showed that vernacular radio has the potential to promote peace in society. The study was therefore guided by the social responsibility theory which underpins the necessity for the media/ journalist to keep society’s interest as a top priority. This means that the society expects journalists to be accountable, liable and responsible in carrying out their duties. This study utilized both qualitative and quantitative research methods. Using a case study of popular vernacular radio stations in three conflict prone regions in Kenya, the researcher employed content analysis, questionnaires and interviews as tools for data collection. The results indicate that the stations have put in place specific policies aimed at ensuring impartiality in reporting and that journalists adhere to them in their work. The stations also work in partnership with other peace practitioners by developing programs that are aimed at promoting peace within and between communities. Furthermore, the findings indicate that the stations’ journalists largely understand and comply with the sections of the Code of Conduct for the Practice of Journalism in Kenya which addresses the need for responsible conflict reporting. Based on these findings, the study therefore concludes that vernacular radio stations working in conflict prone regions in Kenya play a positive role in peace building. However, the study recommends more specialized trainings for journalists in order for these stations to be more effective in this role of peace building.
- Full Text:
- Date Issued: 2019
Virtual Activism: internet memes and political discourse in Nigeria
- Authors: Jimoh, Ganiyu A
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146767 , vital:38555 , http://www.tajuniuyo.ng/Virtual Activism Internet Memes and Political Discourse in Nigeria.html
- Description: This paper examines internet memes as a unique form of narratives about political discourse in Nigeria. Through the use of social media platforms as a vehicle of political communication, internet memes about politics explore issues that contain visual metaphors aimed at provoking discourse and stimulate political participation. By employing semiotic theory, this paper examines 200 pictorial internet memes on Nigerian politics between 2015 and 2018. I argue that internet memes about politics are related to political cartoons in form and context. But unlike cartoons, memes require less artistic prowess and figurative expression in rendition but could achieve the same desire in viewers. Owing to their composition of easily digestible visual elements, they appeal to more audience who in turn could easily lend their voices to a popular meme by adding more textual or visual enhancement to create more layers of meaning.
- Full Text:
- Date Issued: 2019
- Authors: Jimoh, Ganiyu A
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146767 , vital:38555 , http://www.tajuniuyo.ng/Virtual Activism Internet Memes and Political Discourse in Nigeria.html
- Description: This paper examines internet memes as a unique form of narratives about political discourse in Nigeria. Through the use of social media platforms as a vehicle of political communication, internet memes about politics explore issues that contain visual metaphors aimed at provoking discourse and stimulate political participation. By employing semiotic theory, this paper examines 200 pictorial internet memes on Nigerian politics between 2015 and 2018. I argue that internet memes about politics are related to political cartoons in form and context. But unlike cartoons, memes require less artistic prowess and figurative expression in rendition but could achieve the same desire in viewers. Owing to their composition of easily digestible visual elements, they appeal to more audience who in turn could easily lend their voices to a popular meme by adding more textual or visual enhancement to create more layers of meaning.
- Full Text:
- Date Issued: 2019
Virtual reality bridging the gap between work experience required and university qualifications in South Africa
- Authors: Gwatiringa, Tsitsi
- Date: 2019
- Subjects: Employment forecasting -- South Africa , Labor supply -- South Africa -- Forecasting Work environment -- South Africa -- Forecasting
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/42331 , vital:36646
- Description: Increasing technological evolutions are constantly requiring humankind to reform how we plan for the future. Pervasive technologies such as Virtual Reality are making our working life and education to become more digital, complex and interconnected. The job landscape has already been disrupted by the Fourth Industrial Revolution (FIR). The way we work and learn is set to be transformed as the jobs people have and required skills necessary for success are some of the areas most impacted by technological advances such as the FIR and this is particularly concerning for the South African context. New ways of education are required in order to allow future employees to flexibly react to the future world of work and meet the demands of such a digitised working environment. The expected future trajectory of the job landscape may present challenges but there are also unique opportunities. By way of the futures methodology, the intention of this research was to systematically make inquiries, create, suggest and test foreseeable and desirable future visions. Ultimately, the purpose of the research was to assess and suggest plausible futures for the future of education and future of jobs in South Africa. The Six Pillars of Futures Studies approach to research by Inayatullah was applied throughout this study. The mapping (environmental scanning) of Virtual Reality technologies as a driver of change was done, highlighting the impact of such technology on tertiary education and on the world of work. The purpose of the environmental scanning was to uncover existing and driving forces that will influence the future of tertiary education and the future of work. The Causal Layer Analysis (CLA) was the primary futures methodology applied in this research. CLA was used to investigate deeper causal issues from various viewpoints in order to formulate scenarios for the future. The study developed four different future scenarios, namely, “Virtually Going & Thriving”, “Running on Fumes”, “Sneaky Turn” and “Oh Snap! Never Left”. These scenarios can be used as departure points for bridging the gap between education qualifications and skills requirement for jobs in South Africa. Formulated from the “Virtually Going & Thriving" scenario the recommended vision, "Future Vision of Education and Work in South Africa towards 2030" incorporates a realistic, attainable and desirable future that could foreground the improvement of the skills gap in the South African context. The desired future of education and future of work in South Africa is a result of transformation of the tertiary education sector and the acceptance of the Fourth Industrial Revolution, of digital learning, of the new world of work, the demand for new skills - it is a future where Virtual Reality technology is being applied in an innovative approach to equip students with the right skills, to reskill and upskill workers in the workplace and technologies have been leveraged for a sustainable future. The preferred future offered by this research, the “Future Vision of Education and Work in South Africa towards 2030" envisages an education system that broadens access to opportunities and provides the skills and competences that people need to thrive in a new sustainable economy. Education 4.0 can bring a radical shift in the way people think, act and discharge their responsibilities to one another and to the planet. The programmes instituted by "Future Vision of Education and Work in South Africa towards 2030" will build knowledge, skills and values that will be pivotal for the sustainable future of South Africa as a nation.
- Full Text:
- Date Issued: 2019
- Authors: Gwatiringa, Tsitsi
- Date: 2019
- Subjects: Employment forecasting -- South Africa , Labor supply -- South Africa -- Forecasting Work environment -- South Africa -- Forecasting
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/42331 , vital:36646
- Description: Increasing technological evolutions are constantly requiring humankind to reform how we plan for the future. Pervasive technologies such as Virtual Reality are making our working life and education to become more digital, complex and interconnected. The job landscape has already been disrupted by the Fourth Industrial Revolution (FIR). The way we work and learn is set to be transformed as the jobs people have and required skills necessary for success are some of the areas most impacted by technological advances such as the FIR and this is particularly concerning for the South African context. New ways of education are required in order to allow future employees to flexibly react to the future world of work and meet the demands of such a digitised working environment. The expected future trajectory of the job landscape may present challenges but there are also unique opportunities. By way of the futures methodology, the intention of this research was to systematically make inquiries, create, suggest and test foreseeable and desirable future visions. Ultimately, the purpose of the research was to assess and suggest plausible futures for the future of education and future of jobs in South Africa. The Six Pillars of Futures Studies approach to research by Inayatullah was applied throughout this study. The mapping (environmental scanning) of Virtual Reality technologies as a driver of change was done, highlighting the impact of such technology on tertiary education and on the world of work. The purpose of the environmental scanning was to uncover existing and driving forces that will influence the future of tertiary education and the future of work. The Causal Layer Analysis (CLA) was the primary futures methodology applied in this research. CLA was used to investigate deeper causal issues from various viewpoints in order to formulate scenarios for the future. The study developed four different future scenarios, namely, “Virtually Going & Thriving”, “Running on Fumes”, “Sneaky Turn” and “Oh Snap! Never Left”. These scenarios can be used as departure points for bridging the gap between education qualifications and skills requirement for jobs in South Africa. Formulated from the “Virtually Going & Thriving" scenario the recommended vision, "Future Vision of Education and Work in South Africa towards 2030" incorporates a realistic, attainable and desirable future that could foreground the improvement of the skills gap in the South African context. The desired future of education and future of work in South Africa is a result of transformation of the tertiary education sector and the acceptance of the Fourth Industrial Revolution, of digital learning, of the new world of work, the demand for new skills - it is a future where Virtual Reality technology is being applied in an innovative approach to equip students with the right skills, to reskill and upskill workers in the workplace and technologies have been leveraged for a sustainable future. The preferred future offered by this research, the “Future Vision of Education and Work in South Africa towards 2030" envisages an education system that broadens access to opportunities and provides the skills and competences that people need to thrive in a new sustainable economy. Education 4.0 can bring a radical shift in the way people think, act and discharge their responsibilities to one another and to the planet. The programmes instituted by "Future Vision of Education and Work in South Africa towards 2030" will build knowledge, skills and values that will be pivotal for the sustainable future of South Africa as a nation.
- Full Text:
- Date Issued: 2019
Vision-based autonomous aircraft payload delivery system
- Authors: Sewell, James Alderton
- Date: 2019
- Subjects: Airplanes -- Control systems , Systems engineering Engineering -- Data processing Artificial intelligence
- Language: English
- Type: Thesis , Masters , MEng
- Identifier: http://hdl.handle.net/10948/43666 , vital:36960
- Description: This research sought to design and develop an autonomous aircraft payload delivery system which utilised an onboard computer vision system for drop-zone identification. The research was tasked at achieving a modular system which could be used in the delivery of a given payload within a 5 m radius of designated drop-zone identifier. An integrated system was developed, where an autonomous flight controller, an onboard companion computer and computer vision system formed the physical hardware utilised to achieve the desired objectives. A Linux-based Robotic Operating System software architecture was used to develop the control algorithms which governed the autonomous flight control, object recognition and tracking through image processing, and payload release trajectory modelling of the system. The hardware and software architectures were integrated into a remote control fixed-wing aircraft for testing. Implementation of the system through simulation and physical testing proved successful and payload delivery was achieved at an altitude of 75 m, within an average displacement of 1.82 m from the true drop-zone location, where drop-zone detection and location were determined through autonomous survey over the approximate drop-zone’s location. This research furthered the development of autonomous aircraft delivery systems by introducing computer vision as a means of drop-zone location confirmation and authentication, allowing for greater payload delivery security and efficiency. The results gathered in this research illustrated the possible applications of modular airborne payload delivery systems into Industry 4.0 through the use of such a system in the service delivery sector.
- Full Text:
- Date Issued: 2019
- Authors: Sewell, James Alderton
- Date: 2019
- Subjects: Airplanes -- Control systems , Systems engineering Engineering -- Data processing Artificial intelligence
- Language: English
- Type: Thesis , Masters , MEng
- Identifier: http://hdl.handle.net/10948/43666 , vital:36960
- Description: This research sought to design and develop an autonomous aircraft payload delivery system which utilised an onboard computer vision system for drop-zone identification. The research was tasked at achieving a modular system which could be used in the delivery of a given payload within a 5 m radius of designated drop-zone identifier. An integrated system was developed, where an autonomous flight controller, an onboard companion computer and computer vision system formed the physical hardware utilised to achieve the desired objectives. A Linux-based Robotic Operating System software architecture was used to develop the control algorithms which governed the autonomous flight control, object recognition and tracking through image processing, and payload release trajectory modelling of the system. The hardware and software architectures were integrated into a remote control fixed-wing aircraft for testing. Implementation of the system through simulation and physical testing proved successful and payload delivery was achieved at an altitude of 75 m, within an average displacement of 1.82 m from the true drop-zone location, where drop-zone detection and location were determined through autonomous survey over the approximate drop-zone’s location. This research furthered the development of autonomous aircraft delivery systems by introducing computer vision as a means of drop-zone location confirmation and authentication, allowing for greater payload delivery security and efficiency. The results gathered in this research illustrated the possible applications of modular airborne payload delivery systems into Industry 4.0 through the use of such a system in the service delivery sector.
- Full Text:
- Date Issued: 2019
Visual art education narratives in context: contribution by offenders in one correctional facility in the Eastern Cape
- Authors: Potelwa, Siphe
- Date: 2019
- Subjects: Adult learning
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: http://hdl.handle.net/10353/16665 , vital:40741
- Description: This study sought a solution to close the gap of visual art education narratives under recognition and not taken into consideration in correctional facilities. The researcher’s original contribution to knowledge was to provide the theoretical framework as the lens of this study. This research questions the universal objective of how visual art education narratives contribute to the context of the offender’s voice of selfexpression, self-worth, personal identity and human right in a democratic South African as citizens of society. The aim and objectives were to determine if transformation is evidenced through visual art education and ascertain personal identity as a human right and self-worth for an offender. This study was a qualitative research in which perceptions of offenders in visual art education programmes are investigated in-depth regarding the programmes addressing rehabilitation, selfexpression, self-fulfilment and personal development. Eight respondents participated in this study voluntarily. The selection of respondents in this study was through purposeful sampling. Individual interviews, focus group interviews, observation, document review, open-ended interviews, and website data of correctional services were conducted to collect data. The target participants for this qualitative study were permanent employees of Department of Correctional Services and offenders found guilty of murder and sexual abuse against women and children enrolled in a programme of art education. This study found no anticipated risks to voluntary participation in this research, and the study was free from psychological harm. The study contributed and found adult learners bringing their experience and knowledge into creative artwork skills as voice of self-expression, self-worth and rehabilitation. Analysis of data and interpretation of findings revealed the results that visual art education narratives programme brought self-worth, self-expression, selfdevelopment, self-fulfilment, discipline, prevents conflict, boredom and offender recidivism. This study conclusion stressed, an approach to the solution of the adult learning visual art education in correctional centre were problems identified. It is recommended that the correctional facility, interactive relationships with other departments, and commitment should be implemented without delay
- Full Text:
- Date Issued: 2019
- Authors: Potelwa, Siphe
- Date: 2019
- Subjects: Adult learning
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: http://hdl.handle.net/10353/16665 , vital:40741
- Description: This study sought a solution to close the gap of visual art education narratives under recognition and not taken into consideration in correctional facilities. The researcher’s original contribution to knowledge was to provide the theoretical framework as the lens of this study. This research questions the universal objective of how visual art education narratives contribute to the context of the offender’s voice of selfexpression, self-worth, personal identity and human right in a democratic South African as citizens of society. The aim and objectives were to determine if transformation is evidenced through visual art education and ascertain personal identity as a human right and self-worth for an offender. This study was a qualitative research in which perceptions of offenders in visual art education programmes are investigated in-depth regarding the programmes addressing rehabilitation, selfexpression, self-fulfilment and personal development. Eight respondents participated in this study voluntarily. The selection of respondents in this study was through purposeful sampling. Individual interviews, focus group interviews, observation, document review, open-ended interviews, and website data of correctional services were conducted to collect data. The target participants for this qualitative study were permanent employees of Department of Correctional Services and offenders found guilty of murder and sexual abuse against women and children enrolled in a programme of art education. This study found no anticipated risks to voluntary participation in this research, and the study was free from psychological harm. The study contributed and found adult learners bringing their experience and knowledge into creative artwork skills as voice of self-expression, self-worth and rehabilitation. Analysis of data and interpretation of findings revealed the results that visual art education narratives programme brought self-worth, self-expression, selfdevelopment, self-fulfilment, discipline, prevents conflict, boredom and offender recidivism. This study conclusion stressed, an approach to the solution of the adult learning visual art education in correctional centre were problems identified. It is recommended that the correctional facility, interactive relationships with other departments, and commitment should be implemented without delay
- Full Text:
- Date Issued: 2019
Vowel harmony in isiXhosa: an OT and acoustic study of [ATR]
- Authors: Kilian, Kelly
- Date: 2019
- Subjects: Grammar, Comparative and general -- Vowel harmony , Xhosa language -- Vowels , Xhosa language -- Phonetics
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/67678 , vital:29128
- Description: The vowel harmony system in isiXhosa is centred on a process of vowel raising. All mid-vowels preceding a high vowel take on the feature advanced tongue root (ATR) (e.g. thɛnga ‘buy’ → thengisa ‘sell’; bɔna 'see' → bonisa 'cause to see') (Harris 1987). The process of mid-vowel assimilation for the feature [+ATR] is consistent in all instances in which the mid-vowel occurs preceding a high vowel trigger, unless harmony is blocked by the low opaque vowel [a]. This is the analysis presented in Jokweni & Thipa (1996) the only previous literature to address the vowel harmony process of isiXhosa in detail. As an alternative approach to the rule-based phonology applied in the analysis presented by Jokweni & Thipa (1996), I propose the introduction of Optimality theory (OT) (Prince & Smolensky 1993, Bakovic 2000, and Pulleyblank 2002). I will present a map of the harmony system of isiXhosa using OT, while also presenting acoustic data to supplement the selected examples provided in Jokweni & Thipa (1996). This acoustic investigation will determine whether the harmonic feature is ATR, and how this feature patterns among vowels in different phonological contexts. In this paper vowel harmony is achieved through the implication of numerous rules, and with very specific directional and prosodic limitations on the spread of [+ATR]. Using generalisations based on my own collected data as well as those reported in previous literature, I have developed a constraint ranking to account for the harmony process in isiXhosa. By adapting the No-disagreement approach to harmony (Pulleyblank 2002), the final constraint ranking has the capacity to derive the optimal phonetic candidate for every harmony case. A selection of spread constraints is used to account for the raising as well as blocking processes, by driving either regressive or progressive spreading. Within the original No-disagreement approach a spread constraint would recognised only one feature in its prohibition of disagreeing segments. However, in the adapted approach the spread constraint driving [+ATR] assimilation is combined with a feature of correspondence (Krämer 2001) which considers the height as well as the ATR value of the sequential segments. The constraint is therefore adapted to consider more than one feature and is not activated unless the sequential segments agree for this particular feature. The regressive spread constraint is therefore only activated when the consecutive segments have an agreeing height value. The introduction of this adaptation was necessary to provide a more nuanced OT approach with the capacity to effectively characterise the idiosyncrasies observed in this harmony pattern. The harmony constraints are therefore no longer contradict one another by simultaneously driving harmony in opposite directions. Furthermore, the direct acoustic analysis is completed by means of the PRAAT software, to answer the salient question of the definitive harmonic feature. To provide a multiplicity of empirical evidence I have recorded utterances containing a number of vowel combinations. Each combination positions the alternating mid-vowels in a particular phonological context from which instances of ATR alternations have been extracted and phonetically analysed. Using the generalisations reported in Jokweni & Thipa (1996) as a starting point, the acoustic signal of each mid-vowel within a set phonological context is annotated for a predicted ATR value. Hence, if a mid-vowel occurs preceding a high vowel it is annotated as [+ATR] etc. The data sets representing each of the mid-variants found in a specific phonological context are then plotted into vowel charts and compared by means of statistical analysis (Baayen 2008, Bluman 2000). The results are then used to determine whether any significant phonetic alternation is occurring, and what the acoustic distinction between [+ATR] & [-ATR] variants is essentially comprised of. The final acoustic results indicate a significant difference between the mid-vowel ATR variants extracted from specific phonological contexts. Hence, due to co-articulatory effects or some other phonological influence the realisation of [+/-ATR] variants exist along a spectrum, and are therefore not phonetically consistent, but indicate a different acoustic make-up across the various groups.
- Full Text:
- Date Issued: 2019
- Authors: Kilian, Kelly
- Date: 2019
- Subjects: Grammar, Comparative and general -- Vowel harmony , Xhosa language -- Vowels , Xhosa language -- Phonetics
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/67678 , vital:29128
- Description: The vowel harmony system in isiXhosa is centred on a process of vowel raising. All mid-vowels preceding a high vowel take on the feature advanced tongue root (ATR) (e.g. thɛnga ‘buy’ → thengisa ‘sell’; bɔna 'see' → bonisa 'cause to see') (Harris 1987). The process of mid-vowel assimilation for the feature [+ATR] is consistent in all instances in which the mid-vowel occurs preceding a high vowel trigger, unless harmony is blocked by the low opaque vowel [a]. This is the analysis presented in Jokweni & Thipa (1996) the only previous literature to address the vowel harmony process of isiXhosa in detail. As an alternative approach to the rule-based phonology applied in the analysis presented by Jokweni & Thipa (1996), I propose the introduction of Optimality theory (OT) (Prince & Smolensky 1993, Bakovic 2000, and Pulleyblank 2002). I will present a map of the harmony system of isiXhosa using OT, while also presenting acoustic data to supplement the selected examples provided in Jokweni & Thipa (1996). This acoustic investigation will determine whether the harmonic feature is ATR, and how this feature patterns among vowels in different phonological contexts. In this paper vowel harmony is achieved through the implication of numerous rules, and with very specific directional and prosodic limitations on the spread of [+ATR]. Using generalisations based on my own collected data as well as those reported in previous literature, I have developed a constraint ranking to account for the harmony process in isiXhosa. By adapting the No-disagreement approach to harmony (Pulleyblank 2002), the final constraint ranking has the capacity to derive the optimal phonetic candidate for every harmony case. A selection of spread constraints is used to account for the raising as well as blocking processes, by driving either regressive or progressive spreading. Within the original No-disagreement approach a spread constraint would recognised only one feature in its prohibition of disagreeing segments. However, in the adapted approach the spread constraint driving [+ATR] assimilation is combined with a feature of correspondence (Krämer 2001) which considers the height as well as the ATR value of the sequential segments. The constraint is therefore adapted to consider more than one feature and is not activated unless the sequential segments agree for this particular feature. The regressive spread constraint is therefore only activated when the consecutive segments have an agreeing height value. The introduction of this adaptation was necessary to provide a more nuanced OT approach with the capacity to effectively characterise the idiosyncrasies observed in this harmony pattern. The harmony constraints are therefore no longer contradict one another by simultaneously driving harmony in opposite directions. Furthermore, the direct acoustic analysis is completed by means of the PRAAT software, to answer the salient question of the definitive harmonic feature. To provide a multiplicity of empirical evidence I have recorded utterances containing a number of vowel combinations. Each combination positions the alternating mid-vowels in a particular phonological context from which instances of ATR alternations have been extracted and phonetically analysed. Using the generalisations reported in Jokweni & Thipa (1996) as a starting point, the acoustic signal of each mid-vowel within a set phonological context is annotated for a predicted ATR value. Hence, if a mid-vowel occurs preceding a high vowel it is annotated as [+ATR] etc. The data sets representing each of the mid-variants found in a specific phonological context are then plotted into vowel charts and compared by means of statistical analysis (Baayen 2008, Bluman 2000). The results are then used to determine whether any significant phonetic alternation is occurring, and what the acoustic distinction between [+ATR] & [-ATR] variants is essentially comprised of. The final acoustic results indicate a significant difference between the mid-vowel ATR variants extracted from specific phonological contexts. Hence, due to co-articulatory effects or some other phonological influence the realisation of [+/-ATR] variants exist along a spectrum, and are therefore not phonetically consistent, but indicate a different acoustic make-up across the various groups.
- Full Text:
- Date Issued: 2019
Vulnerability in surf tourism: surf break decline and its impact on Herold's Bay, South Africa
- Authors: Schröder, Klaus
- Date: 2019
- Subjects: Surfing -- South Africa , Tourism -- Environmental aspects Climatic changes -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/43501 , vital:36900
- Description: Surfing has increasingly become a mainstream and demographically diverse activity that holds substantial economic worth. It also holds substantial social, cultural and spiritual value for participants and related communities. It is therefore not surprising that the maintenance of surf breaks has become an important element of coastal tourism, and that tourism management has had a growing concern with anthropogenic impacts on the shoreline. In line with these developments, this study investigates the vulnerability of surf tourism given the general consensus that there has been a human-induced decline of the river-mouth surf break in Herold’s Bay. An adapted ecological services model is used, and in line with such models, the status of the three types of capital (natural (physical) capital, climatic capital, and built capital) and their effect on recreation capital (surfing’s participation, market, and non-market values) over a twenty-year period is tracked. The findings identified alterations to the river bed morphology, beach morphology, wind direction, and swell intensity and frequency as the main determinants in surf break decline. The corresponding increase in vulnerability of Herold’s Bay’s surf tourism industry is also given as having negative socio-economic impacts. This study has underlined both the potential and the imperative to conserve, utilise and develop surf breaks and the surf tourism industry within South Africa.
- Full Text:
- Date Issued: 2019
- Authors: Schröder, Klaus
- Date: 2019
- Subjects: Surfing -- South Africa , Tourism -- Environmental aspects Climatic changes -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/43501 , vital:36900
- Description: Surfing has increasingly become a mainstream and demographically diverse activity that holds substantial economic worth. It also holds substantial social, cultural and spiritual value for participants and related communities. It is therefore not surprising that the maintenance of surf breaks has become an important element of coastal tourism, and that tourism management has had a growing concern with anthropogenic impacts on the shoreline. In line with these developments, this study investigates the vulnerability of surf tourism given the general consensus that there has been a human-induced decline of the river-mouth surf break in Herold’s Bay. An adapted ecological services model is used, and in line with such models, the status of the three types of capital (natural (physical) capital, climatic capital, and built capital) and their effect on recreation capital (surfing’s participation, market, and non-market values) over a twenty-year period is tracked. The findings identified alterations to the river bed morphology, beach morphology, wind direction, and swell intensity and frequency as the main determinants in surf break decline. The corresponding increase in vulnerability of Herold’s Bay’s surf tourism industry is also given as having negative socio-economic impacts. This study has underlined both the potential and the imperative to conserve, utilise and develop surf breaks and the surf tourism industry within South Africa.
- Full Text:
- Date Issued: 2019
Wand plant architecture in the Fynbos: Testing the rodent herbivory hypothesis
- Bailey, Lauren A, Potts, A J, Cowling, R M, Whitfield, Maxine C, Smit, Ben
- Authors: Bailey, Lauren A , Potts, A J , Cowling, R M , Whitfield, Maxine C , Smit, Ben
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440583 , vital:73795 , https://doi.org/10.1016/j.sajb.2019.03.035
- Description: Throughout the Cape Floristic Region, in a range of local environments, can be found a distinctive growth form: “wand” plants. This curious plant architecture comprises perennial plants which have slender (wand-like) stems that extend high above the matrix vegetation. We explore whether the evolution of wand-plants may have been driven by plant–herbivore interactions with rodents, where such architecture reduces access to nutrient rich flowers and seeds. To test this idea, we determined if (i) wand-plants were more flexible than non-wand congeners, and (ii) a stabilised wand plant was favoured for climbing (by laboratory mice) over a free-standing wand plant in a laboratory setting. Under a phylogenetic independent contrast framework, wand-plants were not more flexible (across a range of diameters) than non-wand congeners.
- Full Text:
- Date Issued: 2019
- Authors: Bailey, Lauren A , Potts, A J , Cowling, R M , Whitfield, Maxine C , Smit, Ben
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440583 , vital:73795 , https://doi.org/10.1016/j.sajb.2019.03.035
- Description: Throughout the Cape Floristic Region, in a range of local environments, can be found a distinctive growth form: “wand” plants. This curious plant architecture comprises perennial plants which have slender (wand-like) stems that extend high above the matrix vegetation. We explore whether the evolution of wand-plants may have been driven by plant–herbivore interactions with rodents, where such architecture reduces access to nutrient rich flowers and seeds. To test this idea, we determined if (i) wand-plants were more flexible than non-wand congeners, and (ii) a stabilised wand plant was favoured for climbing (by laboratory mice) over a free-standing wand plant in a laboratory setting. Under a phylogenetic independent contrast framework, wand-plants were not more flexible (across a range of diameters) than non-wand congeners.
- Full Text:
- Date Issued: 2019