Fraction-specific geochemistry across the Asbestos Hills BIF of the Transvaal Supergroup, South Africa: implications for the origin of BIF and the history of atmospheric oxygen
- Oonk, Paul Bernardus Hendrikus
- Authors: Oonk, Paul Bernardus Hendrikus
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/50721 , vital:26021
- Description: Banded iron formations (BIF), deposited prior to and concurrent with the Great Oxidation Event (GOE) at ca. 2.4 Ga, record changes in oceanic and atmospheric chemistry during this critical time interval. Four previously unstudied drill-cores from the Griqualand West Basin, South Africa, capturing the rhythmically mesobanded, deep-water Kuruman BIF and the overlying granular, shallower Griquatown BIF, were sampled every ca. 10 m along core depth. Mineralogically, these BIFs consist of three iron-bearing fractions: (1) Fe-Ca-Mg-Mn carbonates, (2) magnetite with/without minor hematite and (3) Fe-silicates. These fractions are typically fine-grained on a sub-μm scale and their co-occurrence in varying amounts means that bulk-rock or microanalytical geochemical and stable isotope data are influenced by mineralogy.
- Full Text:
- Date Issued: 2017
- Authors: Oonk, Paul Bernardus Hendrikus
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/50721 , vital:26021
- Description: Banded iron formations (BIF), deposited prior to and concurrent with the Great Oxidation Event (GOE) at ca. 2.4 Ga, record changes in oceanic and atmospheric chemistry during this critical time interval. Four previously unstudied drill-cores from the Griqualand West Basin, South Africa, capturing the rhythmically mesobanded, deep-water Kuruman BIF and the overlying granular, shallower Griquatown BIF, were sampled every ca. 10 m along core depth. Mineralogically, these BIFs consist of three iron-bearing fractions: (1) Fe-Ca-Mg-Mn carbonates, (2) magnetite with/without minor hematite and (3) Fe-silicates. These fractions are typically fine-grained on a sub-μm scale and their co-occurrence in varying amounts means that bulk-rock or microanalytical geochemical and stable isotope data are influenced by mineralogy.
- Full Text:
- Date Issued: 2017
Freshwater invertebrate assemblages of the Eastern Cape Karoo region (South Africa) earmarked for shale gas exploration
- Authors: Mabidi, Annah
- Date: 2017
- Subjects: Invertebrates -- South Africa -- Karoo , Shale gas -- Conservation -- South Africa -- Karoo Freshwater animals -- South Africa -- Karoo Stream ecology -- South Africa -- Karoo
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/13713 , vital:27301
- Description: The Eastern Cape Karoo region is semi-arid with highly variable rainfall. This variability in rainfall sustains a mosaic of surface freshwater bodies that range from permanently to temporarily inundated. These waterbodies provide habitats for diverse invertebrate assemblages. The imminent hydraulic fracturing for shale gas has a potential to modify the water regime, with particular risk of salinisation. Accumulation of salts in freshwater wetlands results in loss of biodiversity, as invertebrate species shift from salt intolerant to salt tolerant species. This study therefore aims to expand on existing knowledge and provide new information on the distribution, diversity and structure of macroinvertebrate assemblages associated with various freshwater bodies in the region prior to shale gas exploration. Limnological and ecological aspects of thirty-three waterbodies (rivers, dams and depression wetlands) were investigated between November 2014 and March 2016. An experimental study on the effects of salinity on hatching success of branchiopod resting eggs was also included in the research. Rivers were characterised by high conductivity and depression wetlands by high turbidity, while dams had relatively higher pH than the other two waterbody types. In terms of global phosphorus interpretation guidelines, the results indicate that freshwater systems in the study region are predominantly eutrophic, indicating that agricultural run-off, particularly from livestock dung (goats, cattle and sheep), is an important source of phosphorus in the freshwater systems studied. Our results revealed new distribution records for branchiopod crustaceans in the Eastern Cape region, including the first record of Laevicaudata. Results showed that the sampled variables were unable to explain the variation in physicochemistry and invertebrate assemblage of several sites. Waterbody type, whether a depression wetland or a river, was the only factor that consistently showed an effect on the composition of both physicochemical data and invertebrate data. Depression wetlands ranged from completely bare to being extensively covered by macrophytes. Therefore, the effect of macrophyte cover in structuring macroinvertebrate assemblages was the focus of further investigation. The results indicated that the macrophyte cover gradient had little influence on the structure of the invertebrate assemblages in the depression wetlands, while only the presence/absence of vegetation significantly influenced the structure of the invertebrate assemblages in these systems. Surface area, dissolved inorganic nitrogen and pelagic chlorophyll-a were the environmental variables that best explained the variation in the macroinvertebrate assemblages among the sites. However, the differences in macroinvertebrate richness, abundance and distribution patterns among sites were only weakly influenced by local and regional environmental factors. These findings suggest that invertebrate in temporary wetland systems are adapted to the highly variable nature of temporary habitats, thus the influence of local variables is negligible. Results of the experimental study, on the effect of salinity on hatching success of branchiopod resting eggs, revealed that hatchling abundance and diversity of large branchiopods was significantly reduced at salinities of 2.5 g L−1 and above. Salt-tolerant taxa such as Copepoda and Ostracoda were the only ones to emerge in the highest salinity of 10 g L−1. Thus, should the region continue to experience increasing aridity and possible shale gas development, which all aggravate the salinisation problem, severe loss of branchiopod diversity (Anostraca, Laevicaudata, Spinicaudata and Notostraca) is likely to occur. This may lead to considerable decline in invertebrate diversity in the region, with cascading effects on food webs and ecosystem functions. The findings of this study can potentially be used in comparative studies on wetland invertebrate ecology in other semi-arid regions and in the formulation of policy and strategies for biodiversity conservation.
- Full Text:
- Date Issued: 2017
- Authors: Mabidi, Annah
- Date: 2017
- Subjects: Invertebrates -- South Africa -- Karoo , Shale gas -- Conservation -- South Africa -- Karoo Freshwater animals -- South Africa -- Karoo Stream ecology -- South Africa -- Karoo
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/13713 , vital:27301
- Description: The Eastern Cape Karoo region is semi-arid with highly variable rainfall. This variability in rainfall sustains a mosaic of surface freshwater bodies that range from permanently to temporarily inundated. These waterbodies provide habitats for diverse invertebrate assemblages. The imminent hydraulic fracturing for shale gas has a potential to modify the water regime, with particular risk of salinisation. Accumulation of salts in freshwater wetlands results in loss of biodiversity, as invertebrate species shift from salt intolerant to salt tolerant species. This study therefore aims to expand on existing knowledge and provide new information on the distribution, diversity and structure of macroinvertebrate assemblages associated with various freshwater bodies in the region prior to shale gas exploration. Limnological and ecological aspects of thirty-three waterbodies (rivers, dams and depression wetlands) were investigated between November 2014 and March 2016. An experimental study on the effects of salinity on hatching success of branchiopod resting eggs was also included in the research. Rivers were characterised by high conductivity and depression wetlands by high turbidity, while dams had relatively higher pH than the other two waterbody types. In terms of global phosphorus interpretation guidelines, the results indicate that freshwater systems in the study region are predominantly eutrophic, indicating that agricultural run-off, particularly from livestock dung (goats, cattle and sheep), is an important source of phosphorus in the freshwater systems studied. Our results revealed new distribution records for branchiopod crustaceans in the Eastern Cape region, including the first record of Laevicaudata. Results showed that the sampled variables were unable to explain the variation in physicochemistry and invertebrate assemblage of several sites. Waterbody type, whether a depression wetland or a river, was the only factor that consistently showed an effect on the composition of both physicochemical data and invertebrate data. Depression wetlands ranged from completely bare to being extensively covered by macrophytes. Therefore, the effect of macrophyte cover in structuring macroinvertebrate assemblages was the focus of further investigation. The results indicated that the macrophyte cover gradient had little influence on the structure of the invertebrate assemblages in the depression wetlands, while only the presence/absence of vegetation significantly influenced the structure of the invertebrate assemblages in these systems. Surface area, dissolved inorganic nitrogen and pelagic chlorophyll-a were the environmental variables that best explained the variation in the macroinvertebrate assemblages among the sites. However, the differences in macroinvertebrate richness, abundance and distribution patterns among sites were only weakly influenced by local and regional environmental factors. These findings suggest that invertebrate in temporary wetland systems are adapted to the highly variable nature of temporary habitats, thus the influence of local variables is negligible. Results of the experimental study, on the effect of salinity on hatching success of branchiopod resting eggs, revealed that hatchling abundance and diversity of large branchiopods was significantly reduced at salinities of 2.5 g L−1 and above. Salt-tolerant taxa such as Copepoda and Ostracoda were the only ones to emerge in the highest salinity of 10 g L−1. Thus, should the region continue to experience increasing aridity and possible shale gas development, which all aggravate the salinisation problem, severe loss of branchiopod diversity (Anostraca, Laevicaudata, Spinicaudata and Notostraca) is likely to occur. This may lead to considerable decline in invertebrate diversity in the region, with cascading effects on food webs and ecosystem functions. The findings of this study can potentially be used in comparative studies on wetland invertebrate ecology in other semi-arid regions and in the formulation of policy and strategies for biodiversity conservation.
- Full Text:
- Date Issued: 2017
From dialect to ‘official’ language: towards the intellectualisation of Ndau in Zimbabwe
- Authors: Sithole, Emmanuel
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6086 , vital:21030
- Full Text:
- Date Issued: 2017
- Authors: Sithole, Emmanuel
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6086 , vital:21030
- Full Text:
- Date Issued: 2017
Gang and gang related incidents in selected correctional centres in the Eastern Cape : a behaviour analysis
- Authors: Fitz, Lincoln Gustav
- Date: 2017
- Subjects: Prison gangs -- South Africa Corrections -- South Africa -- Eastern Cape Prisons -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9297 , vital:34319
- Description: Institutional gangs, also known as the numbers gangs, have become a serious threat to the effective administration of correctional facilities in South Africa. Prior the 1980s, these gangs were active only in correctional centres, but due to modern trends in criminal activity and the gangs’ extensive drug operations, they have become active within communities too. The numbers gangs have a national network that controls activities in all correctional centres across South Africa; this network operates effectively and independently of geographical areas. The numbers gangs contribute a large proportion of all disciplinary offences (e.g., assault, smuggling, escape, sodomy, etc.) that take place in South African correctional centres. The purpose of this study was to explore the social and cultural dynamics of selected correctional centres, in order to understand the extent to which institutional gangs control and manipulate the correctional environment. The study also focussed on the individual-level characteristics of inmates as a contributing factor for deviant behaviour. The social processes that manifest in institutional misconduct and violence in correctional centres have been explained in the literature according to three theoretical perspectives; namely, the importation, deprivation and situational contextual perspectives. To develop a better understanding of the phenomenon of gang activities in correctional centres, this study is grounded in the Social Structure and Social Learning theory to explore the individual, social and cultural dynamics of the centre, making reference to these three perspectives. A mixed research design, comprising both qualitative and quantitative aspects, characterised the methodology used in this study. The data informing the study consisted of primary data (observations, interviews and questionnaires) and secondary data (source documents), with 151 inmates and several centre officials in three Eastern Cape correctional centres participating. This study was substantial for several reasons. It confirmed the findings of prior studies with respect to personal and social characteristics that inmates import into correctional centres, and, in addition, it expanded the existing literature with respect to how and why inmates import their deviant behaviour into correctional centres. It further brought a new element to the field of criminology, in identifying the demographic characteristics of inmates that contribute towards institutional gang membership and violence in correctional centres. The study also expanded upon prior findings regarding risk factors associated with institutional gang membership by developing a prediction model to predict possible gang membership prior to and after incarceration. Finally, this is the first known empirical study to examine the social and cultural contexts of gang membership in correctional centres in South Africa.
- Full Text:
- Date Issued: 2017
- Authors: Fitz, Lincoln Gustav
- Date: 2017
- Subjects: Prison gangs -- South Africa Corrections -- South Africa -- Eastern Cape Prisons -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9297 , vital:34319
- Description: Institutional gangs, also known as the numbers gangs, have become a serious threat to the effective administration of correctional facilities in South Africa. Prior the 1980s, these gangs were active only in correctional centres, but due to modern trends in criminal activity and the gangs’ extensive drug operations, they have become active within communities too. The numbers gangs have a national network that controls activities in all correctional centres across South Africa; this network operates effectively and independently of geographical areas. The numbers gangs contribute a large proportion of all disciplinary offences (e.g., assault, smuggling, escape, sodomy, etc.) that take place in South African correctional centres. The purpose of this study was to explore the social and cultural dynamics of selected correctional centres, in order to understand the extent to which institutional gangs control and manipulate the correctional environment. The study also focussed on the individual-level characteristics of inmates as a contributing factor for deviant behaviour. The social processes that manifest in institutional misconduct and violence in correctional centres have been explained in the literature according to three theoretical perspectives; namely, the importation, deprivation and situational contextual perspectives. To develop a better understanding of the phenomenon of gang activities in correctional centres, this study is grounded in the Social Structure and Social Learning theory to explore the individual, social and cultural dynamics of the centre, making reference to these three perspectives. A mixed research design, comprising both qualitative and quantitative aspects, characterised the methodology used in this study. The data informing the study consisted of primary data (observations, interviews and questionnaires) and secondary data (source documents), with 151 inmates and several centre officials in three Eastern Cape correctional centres participating. This study was substantial for several reasons. It confirmed the findings of prior studies with respect to personal and social characteristics that inmates import into correctional centres, and, in addition, it expanded the existing literature with respect to how and why inmates import their deviant behaviour into correctional centres. It further brought a new element to the field of criminology, in identifying the demographic characteristics of inmates that contribute towards institutional gang membership and violence in correctional centres. The study also expanded upon prior findings regarding risk factors associated with institutional gang membership by developing a prediction model to predict possible gang membership prior to and after incarceration. Finally, this is the first known empirical study to examine the social and cultural contexts of gang membership in correctional centres in South Africa.
- Full Text:
- Date Issued: 2017
Genetic diversity, evolutionary relationships and conservation of southern African Labeo fishes in relation to water management
- Authors: Ramoejane, Mpho
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/5209 , vital:20786
- Description: Labeo spp. are large, herbivorous fishes that are important components of aquatic ecosystems and are a high conservation priority in South Africa. This thesis contributes to determination of conservation priorities for Labeo umbratus (Smith 1841) by resolving the taxonomic status of this species in the evolutionary context of southern African Labeo spp., assessing the presence of unique lineages in historically isolated river basins, and assessing the threat of intra- and interspecific hybridisation associated with introductions. Phylogenetic analyses of five DNA sequence data sets (cytochrome c oxidase subunit I gene [COI], cytochrome b gene [Cyt b], Recombination activating gene 1 [Rag1], COI+Rag1 and COI+Cyt b+Rag1) showed that the Labeo umbratus group (sensu Reid, 1985), which comprises the species Labeo umbratus, Labeo capensis (Smith 1841), Labeo seeberi Gilchrist and Thompson 1911 and Labeo rubromaculatus Gilchrist and Thompson 1913, is monophyletic, morphologically distinct and geographically disjunct from other African Labeo spp. groups except in the Tugela River system were L. rubromaculatus co-occurs with Labeo molybdinus Du Plessis 1963. Phylogeographic analysis of mitochondrial DNA (Cyt b) sequence data demonstrated that the populations of the L. umbratus from the Orange and the southward-flowing river systems are reciprocally monophyletic and were identified as evolutionary significant units. The populations in the southward-flowing river systems were further divided into southwestern (Gourits and Gamtoos) and southeastern (Sundays, Bushmans, Great Fish, Keiskamma, Buffalo and Nahoon) polyp hyletic sublineages. Four management units (Gourits Basin; Gamtoos Basin; Sundays+Bushmans+Great Fish River Basins; and Keiskamma+Buffalo+Nahoon River Basin) were not reciprocally monophyletic but were proposed on the basis of containing unique haplotype frequencies for conservation purposes. To evaluate the threat of hybridisation to the genetic integrity of L. umbratus, the occurrence of Labeo umbratus x L. capensis hybrids was investigated using mtDNA Cyt b and nDNA S7 intron sequence data and morphological data. Genetic evidence for interspecific hybridisation was detected for populations in two impoundments, Hardap Dam (Orange River Basin) and Darlington Dam (Sundays River Basin, Eastern Cape, South Africa). Some putative hybrids were identifiable morphologically on account of intermediacy between the parental species in meristic and morphometric characters. Translocation via direct stocking (Hardap Dam) or via an inter-basin water transfer scheme (Darlington Dam) was identified as a driver for hybridisation. Introductions associated with an inter-basin water transfer scheme has resulted in introgression between the previously isolated Orange River and southern lineages of L. umbratus. Further translocation of fish from these affected areas to non-contaminated river systems and impoundments such as Kat River (Great Fish River) and Slagboom (Sundays River) should be avoided.
- Full Text:
- Date Issued: 2017
- Authors: Ramoejane, Mpho
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/5209 , vital:20786
- Description: Labeo spp. are large, herbivorous fishes that are important components of aquatic ecosystems and are a high conservation priority in South Africa. This thesis contributes to determination of conservation priorities for Labeo umbratus (Smith 1841) by resolving the taxonomic status of this species in the evolutionary context of southern African Labeo spp., assessing the presence of unique lineages in historically isolated river basins, and assessing the threat of intra- and interspecific hybridisation associated with introductions. Phylogenetic analyses of five DNA sequence data sets (cytochrome c oxidase subunit I gene [COI], cytochrome b gene [Cyt b], Recombination activating gene 1 [Rag1], COI+Rag1 and COI+Cyt b+Rag1) showed that the Labeo umbratus group (sensu Reid, 1985), which comprises the species Labeo umbratus, Labeo capensis (Smith 1841), Labeo seeberi Gilchrist and Thompson 1911 and Labeo rubromaculatus Gilchrist and Thompson 1913, is monophyletic, morphologically distinct and geographically disjunct from other African Labeo spp. groups except in the Tugela River system were L. rubromaculatus co-occurs with Labeo molybdinus Du Plessis 1963. Phylogeographic analysis of mitochondrial DNA (Cyt b) sequence data demonstrated that the populations of the L. umbratus from the Orange and the southward-flowing river systems are reciprocally monophyletic and were identified as evolutionary significant units. The populations in the southward-flowing river systems were further divided into southwestern (Gourits and Gamtoos) and southeastern (Sundays, Bushmans, Great Fish, Keiskamma, Buffalo and Nahoon) polyp hyletic sublineages. Four management units (Gourits Basin; Gamtoos Basin; Sundays+Bushmans+Great Fish River Basins; and Keiskamma+Buffalo+Nahoon River Basin) were not reciprocally monophyletic but were proposed on the basis of containing unique haplotype frequencies for conservation purposes. To evaluate the threat of hybridisation to the genetic integrity of L. umbratus, the occurrence of Labeo umbratus x L. capensis hybrids was investigated using mtDNA Cyt b and nDNA S7 intron sequence data and morphological data. Genetic evidence for interspecific hybridisation was detected for populations in two impoundments, Hardap Dam (Orange River Basin) and Darlington Dam (Sundays River Basin, Eastern Cape, South Africa). Some putative hybrids were identifiable morphologically on account of intermediacy between the parental species in meristic and morphometric characters. Translocation via direct stocking (Hardap Dam) or via an inter-basin water transfer scheme (Darlington Dam) was identified as a driver for hybridisation. Introductions associated with an inter-basin water transfer scheme has resulted in introgression between the previously isolated Orange River and southern lineages of L. umbratus. Further translocation of fish from these affected areas to non-contaminated river systems and impoundments such as Kat River (Great Fish River) and Slagboom (Sundays River) should be avoided.
- Full Text:
- Date Issued: 2017
Geomorphological connectivity and sensitivity examined in a recently degraded gravel-bed stream: implications for river-floodplain rehabilitation
- Authors: Powell, Rebecca
- Date: 2017
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/53722 , vital:26313
- Description: The study of river complexity and sensitivity to future human land-use activities and climate change is a fast growing field within the discipline of fluvial geomorphology. Associated with this is a need to improve river rehabilitation and catchment management approach, design and effectiveness. This study aimed to investigate drivers of the recent geomorphological sensitivity of the Baviaanskloof River-floodplain, an upland system in South Africa, by integrating the concepts of geomorphological connectivity and Panarchy. The understanding generated was used to evaluate the approach of the State agency, Working for Wetlands (WfWet), to river-floodplain rehabilitation in the catchment.The concepts of geomorphological connectivity and Panarchy provide useful frameworks for understanding interactions between geomorphological processes and structure across scales of space and time. Geomorphological connectivity explains the degree to which water and sediment is linked in a river landscape, determined by the distribution of erosional and depositional landforms (Brierley et al. 2006; Fryirs et al. 2007a; Fryirs et al. 2007b). Panarchy attempts to explain lagged response to disturbances, non-linear interactions, and sudden shifts in system state, and has been applied largely to ecological systems. Panarchy theory, when combined with the concept of geomorphological connectivity, provides a guiding framework for understanding river complexity in greater depth. The first results chapter of this study investigated river long-term and recent geomorphological history, towards understanding the nature and timing of river geomorphological cycling between erosion and deposition. Optically Stimulated Luminescence dating of alluvial fan and floodplain sedimentary units was conducted, for analysis of river-floodplain long-term history (100s to 1 000s of years). Interviews with 11 local landowners, combined with analysis of historic aerial imagery and river-floodplain topographic surveys, provided a means of describing recent (last few decades) geomorphological dynamics. The results indicated that the Baviaanskloof is naturally a cut- and-fill landscape over scales of several hundred to thousands of years, characterized by the alternation between phases of high fluvial energy and alluvial fan expansion, and low energy conditions associated with floodplain accretion. Recent and widespread river-floodplain degradation was compressed into a short period of approximately 30 years, suggesting that one or more drivers have pushed the system beyond a threshold, resulting in increased water and sediment connectivity. The second results chapter investigated the role of human land-use activities and flooding frequency and magnitude, as drivers of recent river-floodplain degradation. Human impacts were investigated by describing land-use activities for the preceding 80 years, and relating these activities to changes in river-floodplain form and behavior. Temporal trends in flood events of different frequency and magnitude were investigated by analyzing rainfall data, integrated with landowner reports of flood-inducing rainfall magnitudes. The findings indicated that human land-use activities have been an important driver of recent river- floodplain degradation, through the enhancement of water and sediment connectivity across spatial scales of the catchment. Episodic and high magnitude floods synergized with human driven increased connectivity, precipitating stream power and geomorphological threshold breaches, resulting in a shift in river behaviour. The third results chapter investigated the influence of tributary-junction streams and fans on the geomorphological form, behavior and sensitivity of the Baviaanskloof River. Local- scale topographic impacts of tributary fans and streams were described using topographic surveys and geomorphological mapping techniques. Tributary streams form a major control on the behaviour of the river, by influencing the degree of coarse sediment connectivity with the main channel. Although tributary fans buffer the river from disturbances occurring in the wider catchment, they initiate topographic variations along the floodplain, influencing local-scale patterns of deposition and erosion along the river. The main river responds to water and sediment inputs from tributary junction streams by locally adjusting longitudinal slope, maintaining an overall constant slope of 0.0066 m/m. The response of the Baviaanskloof River to tributary junction fans and streams is however variable, and is fashioned by complex interactions between geomorphological and anthropogenic factors. The final two chapters of the thesis evaluate the findings of the study within the context of river-floodplain rehabilitation approaches in South Africa, and within the theoretical, philosophical and methodological context of the research. The first of these two chapters evaluates the approach of the WfWet programme to river-floodplain rehabilitation in the Baviaanskloof. The chapter indicates that the present practice of WfWet is to reinstate a pre-degradation state, which is not suited to the Baviaanskloof River-floodplain, since the river-floodplain has passed a geomorphological threshold, resulting in a new set of interacting processes and landforms. The author presents a conceptual model illustrating the existence of geomorphological adaptive cycles interacting across spatial and temporal scales, thereby attempting to explain a river Panarchy specific to the Baviaanskloof. From this conceptual model, a hierarchical rehabilitation framework, targeting geomorphological processes and structure situated at different spatial and temporal scales of the landscape is suggested. The final chapter discusses the implications of integrating the concepts of geomorphological connectivity and river Panarchy theory in studies of river complexity and sensitivity to geomorphological change. The author suggests that there is scope for further investigation of the application of the two concepts within the discipline of fluvial geomorphology, particularly with regard to developing quantitative approaches to measuring and describing connectivity and Panarchy.
- Full Text:
- Date Issued: 2017
- Authors: Powell, Rebecca
- Date: 2017
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/53722 , vital:26313
- Description: The study of river complexity and sensitivity to future human land-use activities and climate change is a fast growing field within the discipline of fluvial geomorphology. Associated with this is a need to improve river rehabilitation and catchment management approach, design and effectiveness. This study aimed to investigate drivers of the recent geomorphological sensitivity of the Baviaanskloof River-floodplain, an upland system in South Africa, by integrating the concepts of geomorphological connectivity and Panarchy. The understanding generated was used to evaluate the approach of the State agency, Working for Wetlands (WfWet), to river-floodplain rehabilitation in the catchment.The concepts of geomorphological connectivity and Panarchy provide useful frameworks for understanding interactions between geomorphological processes and structure across scales of space and time. Geomorphological connectivity explains the degree to which water and sediment is linked in a river landscape, determined by the distribution of erosional and depositional landforms (Brierley et al. 2006; Fryirs et al. 2007a; Fryirs et al. 2007b). Panarchy attempts to explain lagged response to disturbances, non-linear interactions, and sudden shifts in system state, and has been applied largely to ecological systems. Panarchy theory, when combined with the concept of geomorphological connectivity, provides a guiding framework for understanding river complexity in greater depth. The first results chapter of this study investigated river long-term and recent geomorphological history, towards understanding the nature and timing of river geomorphological cycling between erosion and deposition. Optically Stimulated Luminescence dating of alluvial fan and floodplain sedimentary units was conducted, for analysis of river-floodplain long-term history (100s to 1 000s of years). Interviews with 11 local landowners, combined with analysis of historic aerial imagery and river-floodplain topographic surveys, provided a means of describing recent (last few decades) geomorphological dynamics. The results indicated that the Baviaanskloof is naturally a cut- and-fill landscape over scales of several hundred to thousands of years, characterized by the alternation between phases of high fluvial energy and alluvial fan expansion, and low energy conditions associated with floodplain accretion. Recent and widespread river-floodplain degradation was compressed into a short period of approximately 30 years, suggesting that one or more drivers have pushed the system beyond a threshold, resulting in increased water and sediment connectivity. The second results chapter investigated the role of human land-use activities and flooding frequency and magnitude, as drivers of recent river-floodplain degradation. Human impacts were investigated by describing land-use activities for the preceding 80 years, and relating these activities to changes in river-floodplain form and behavior. Temporal trends in flood events of different frequency and magnitude were investigated by analyzing rainfall data, integrated with landowner reports of flood-inducing rainfall magnitudes. The findings indicated that human land-use activities have been an important driver of recent river- floodplain degradation, through the enhancement of water and sediment connectivity across spatial scales of the catchment. Episodic and high magnitude floods synergized with human driven increased connectivity, precipitating stream power and geomorphological threshold breaches, resulting in a shift in river behaviour. The third results chapter investigated the influence of tributary-junction streams and fans on the geomorphological form, behavior and sensitivity of the Baviaanskloof River. Local- scale topographic impacts of tributary fans and streams were described using topographic surveys and geomorphological mapping techniques. Tributary streams form a major control on the behaviour of the river, by influencing the degree of coarse sediment connectivity with the main channel. Although tributary fans buffer the river from disturbances occurring in the wider catchment, they initiate topographic variations along the floodplain, influencing local-scale patterns of deposition and erosion along the river. The main river responds to water and sediment inputs from tributary junction streams by locally adjusting longitudinal slope, maintaining an overall constant slope of 0.0066 m/m. The response of the Baviaanskloof River to tributary junction fans and streams is however variable, and is fashioned by complex interactions between geomorphological and anthropogenic factors. The final two chapters of the thesis evaluate the findings of the study within the context of river-floodplain rehabilitation approaches in South Africa, and within the theoretical, philosophical and methodological context of the research. The first of these two chapters evaluates the approach of the WfWet programme to river-floodplain rehabilitation in the Baviaanskloof. The chapter indicates that the present practice of WfWet is to reinstate a pre-degradation state, which is not suited to the Baviaanskloof River-floodplain, since the river-floodplain has passed a geomorphological threshold, resulting in a new set of interacting processes and landforms. The author presents a conceptual model illustrating the existence of geomorphological adaptive cycles interacting across spatial and temporal scales, thereby attempting to explain a river Panarchy specific to the Baviaanskloof. From this conceptual model, a hierarchical rehabilitation framework, targeting geomorphological processes and structure situated at different spatial and temporal scales of the landscape is suggested. The final chapter discusses the implications of integrating the concepts of geomorphological connectivity and river Panarchy theory in studies of river complexity and sensitivity to geomorphological change. The author suggests that there is scope for further investigation of the application of the two concepts within the discipline of fluvial geomorphology, particularly with regard to developing quantitative approaches to measuring and describing connectivity and Panarchy.
- Full Text:
- Date Issued: 2017
Hearing the citizens: inequality, access to journalists and the prospects for inclusively mediated spaces of political deliberation in South Africa
- Authors: Oelofsen, Marietjie
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/35030 , vital:24309
- Description: This study examines the extent to which material and social inequality in post-apartheid South Africa affect possibilities for poor citizens to gain access to mainstream spaces of mediated political deliberation. Access is problematized in terms of the possibilities that exist for poor citizens to ‘appear’ in these spaces as emancipated citizens with political agency. The study is motivated by a perception that South Africa’s middle-class and privileged citizens have more access to political deliberation because mainstream journalists pay more attention to their political concerns. Because mediated political deliberation provides a space for articulating the political will of citizens it is important that it reflects the multiple, and diverse range of voices that make up South Africa’s polity. If the experience of socioeconomically marginalised citizens is not registered in the same way as the experience of citizens with economic and political power, the balance of political decision-making continues to be skewed against the interests of the poor. Rather than a media-centric approach, the study centres on perceptions and views of poor citizens about their relationship with mainstream journalists. The study combines information from group interviews with citizens from Hangberg, Cape Town with 410 news reports in 18 mainstream newspapers about Hangberg citizens over a 20-year period. The interviews show that poor citizens feel largely excluded from mediated political deliberation; not because they do not appear in the news but because of how they appear in the news. The news reports confirm that mainstream journalists pay more attention to voices with political and economic power than to the voices of poor citizens. Even in news reports about Hangberg citizens, political leaders and non-governmental experts often talk about the problems in Hangberg more than the citizens of Hangberg themselves talk about these problems. Building on a relatively new scholarly interest in ‘active’ and ‘political’ listening in media studies and democratic theory (Bickford 1996, Dreher 2009, Couldry 2009, Dobson 2014, Wasserman 2013, Garman and Malila 2014), I consider listening as a constitutive element of the way in which journalists engage with poor citizens in mediated deliberative spaces. I ask whether different practices of listening can enable journalists to construct narratives that provide marginalised groups with different possibilities for equal access to, and participation in these spaces?
- Full Text:
- Date Issued: 2017
- Authors: Oelofsen, Marietjie
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/35030 , vital:24309
- Description: This study examines the extent to which material and social inequality in post-apartheid South Africa affect possibilities for poor citizens to gain access to mainstream spaces of mediated political deliberation. Access is problematized in terms of the possibilities that exist for poor citizens to ‘appear’ in these spaces as emancipated citizens with political agency. The study is motivated by a perception that South Africa’s middle-class and privileged citizens have more access to political deliberation because mainstream journalists pay more attention to their political concerns. Because mediated political deliberation provides a space for articulating the political will of citizens it is important that it reflects the multiple, and diverse range of voices that make up South Africa’s polity. If the experience of socioeconomically marginalised citizens is not registered in the same way as the experience of citizens with economic and political power, the balance of political decision-making continues to be skewed against the interests of the poor. Rather than a media-centric approach, the study centres on perceptions and views of poor citizens about their relationship with mainstream journalists. The study combines information from group interviews with citizens from Hangberg, Cape Town with 410 news reports in 18 mainstream newspapers about Hangberg citizens over a 20-year period. The interviews show that poor citizens feel largely excluded from mediated political deliberation; not because they do not appear in the news but because of how they appear in the news. The news reports confirm that mainstream journalists pay more attention to voices with political and economic power than to the voices of poor citizens. Even in news reports about Hangberg citizens, political leaders and non-governmental experts often talk about the problems in Hangberg more than the citizens of Hangberg themselves talk about these problems. Building on a relatively new scholarly interest in ‘active’ and ‘political’ listening in media studies and democratic theory (Bickford 1996, Dreher 2009, Couldry 2009, Dobson 2014, Wasserman 2013, Garman and Malila 2014), I consider listening as a constitutive element of the way in which journalists engage with poor citizens in mediated deliberative spaces. I ask whether different practices of listening can enable journalists to construct narratives that provide marginalised groups with different possibilities for equal access to, and participation in these spaces?
- Full Text:
- Date Issued: 2017
Identifying growth criteria and sediment movement mechanisms of needle ice using high-frequency environmental and visual monitoring
- Authors: Borg, Carl-Johan
- Date: 2017
- Subjects: Frazil ice , Sediment transport , Ice mechanics , Photography -- Digital techniques , Environmental monitoring
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/17656 , vital:22268
- Description: Environmental growth conditions and mechanisms involved in sediment transport by needle ice have historically been difficult to assess and are poorly documented. The spatial and temporal dynamics that relate to the environment, growth and decay of needle ice are not fully understood. This study monitored needle ice growth, melt and visually identified sediment displacement mechanisms by needle ice, with the aim of revealing environmental growth criteria, timing of growth/melt, ground-surface-air energy balance and sediment displacement mechanisms. Furthermore, the impact of needle ice displacement on vegetation and patterned ground formation was analysed. High-frequency visual monitoring, using three cameras, supplemented by high-frequency measurements of air temperature, soil moisture and wind speed was used to investigate needle ice growth and decay dynamics. Results from visual and environmental monitoring of needle ice growth, showed that the needle ice growing environment was more dynamic, especially in terms of surface temperature, than previously argued. Needle ice growth was observed to occur during surface temperatures from -2.0°C to 2.2°C, soil moisture levels from 0.4% to 37.4% and in winds speeds of 0 m/s to 12.6 m/s. Needle ice initiation was documented a few minutes to hours before or after the onset of surface temperature dropping to below 0°C. Imagery displayed that the depth of ice nucleation was variable within the soil column, possibly relating to the energy balance of radiative cooling, convective heat loss, ground conductivity and latent heat release at the air-surface-ground boundary. Heaving and resettling, toppling and rolling were identified as slope displacement mechanisms when needle ice decayed. Animal trampling and hail were additionally documented as substantial surface altering processes. Furthermore, no impact of needle ice reducing vegetation stability was identified, although a tendency to hinder vegetation expansion was noted. Also, no creation of patterned ground was observed as a result of needle ice decay.
- Full Text:
- Date Issued: 2017
- Authors: Borg, Carl-Johan
- Date: 2017
- Subjects: Frazil ice , Sediment transport , Ice mechanics , Photography -- Digital techniques , Environmental monitoring
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/17656 , vital:22268
- Description: Environmental growth conditions and mechanisms involved in sediment transport by needle ice have historically been difficult to assess and are poorly documented. The spatial and temporal dynamics that relate to the environment, growth and decay of needle ice are not fully understood. This study monitored needle ice growth, melt and visually identified sediment displacement mechanisms by needle ice, with the aim of revealing environmental growth criteria, timing of growth/melt, ground-surface-air energy balance and sediment displacement mechanisms. Furthermore, the impact of needle ice displacement on vegetation and patterned ground formation was analysed. High-frequency visual monitoring, using three cameras, supplemented by high-frequency measurements of air temperature, soil moisture and wind speed was used to investigate needle ice growth and decay dynamics. Results from visual and environmental monitoring of needle ice growth, showed that the needle ice growing environment was more dynamic, especially in terms of surface temperature, than previously argued. Needle ice growth was observed to occur during surface temperatures from -2.0°C to 2.2°C, soil moisture levels from 0.4% to 37.4% and in winds speeds of 0 m/s to 12.6 m/s. Needle ice initiation was documented a few minutes to hours before or after the onset of surface temperature dropping to below 0°C. Imagery displayed that the depth of ice nucleation was variable within the soil column, possibly relating to the energy balance of radiative cooling, convective heat loss, ground conductivity and latent heat release at the air-surface-ground boundary. Heaving and resettling, toppling and rolling were identified as slope displacement mechanisms when needle ice decayed. Animal trampling and hail were additionally documented as substantial surface altering processes. Furthermore, no impact of needle ice reducing vegetation stability was identified, although a tendency to hinder vegetation expansion was noted. Also, no creation of patterned ground was observed as a result of needle ice decay.
- Full Text:
- Date Issued: 2017
Impact of formulated soil types on growth performance, phytochemical constituents and pharmacological properties of solanum nigurm L. : a wild vegetable in the Eastern Cape Province, South Africa
- Authors: Ogundola, Adijat Funke
- Date: 2017
- Subjects: Solanum Materia medica, Vegetable Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/8758 , vital:33519
- Description: Solanum nigrum L. is a wild vegetable that is highly recognised for its high nutiritional and therapeutical purposes. However, proper identification of the plant is essential not only to plant scientists but to a wide range of users. Therefore, the plant’s roots, stems and leaves cultivated on different soil types were viewed under the Scanning Electron Microscope while the leaves were further viewed under the Light Microscope. significant increase was observed in densities of stomata, guard and subsidiary cells of leaves of S. nigrum grown on silty clay loam soil. The SEM analysis revealed abundant glandular and non-glandular trichromes on both surfaces of the leaves. The glandular trichome is known to be responsible for the storage of bioactive compounds for which this plant is well known. Cultivation was embarked upon, for the availability of the plant at all times. However, propagation was by seed alone, therefore, quality seed is necessary for cultivation. Study was carried out on seeds extracted from plants growing in the wild in Alice for the seed viability, germination and seedling emergence when subjected to different soil texture types and sowing depths. The seeds were 98.3 percent viable. Highest germination (94.66 percent) was recorded in sand paper scarification, 15, 20 and 25ºC. Continuous darkness and temperatures lower than 5ºC and higher than 35ºCwere detrimental to the seeds. Silty clay loam soil and a depth of 2 cm had the highest seedling emergence 90 percent and recommended as the ideal condition for seedlings emergence. The growth, yield and physiological response of S. nigrum to sandy clay loam, silty clay loam, clay loam, loam soils and control soil (sandy loam) were investigated in the glasshouse in two separate trials. The ANOVA analysed data results indicated that plant samples on silty clay loam significantly increased in height, stem girth, plant root, leaf area, number of leaves, number of branches, number of flowers, number of fruit bunch per plant dry weight, as well as weight of fruit bunch. However, plant samples grown on clay loam and loam soils recorded increased chlorophyll and produced dark green leaves. It is conceivable that silty clay loam soils have a strong ability to support the physiological growth and the yield of S. nigrum. These soils are therefore recommended for the cultivation of this plant. S. nigrum cultivated on these soils was evaluated for proximate compositions, anti-nutrients, vitamins A, C and E and mineral compositions using standard analytical methods. Using the translocation factor, the minerals’ toxicity accumulation levels in the plant were also determined. Accumulation of proximate parameters in the first and second trials are: ash (11.25-12.25 percent and 11.14- 11.54 percent), crude fibre (19.24-19.95 percent and 18.71-19.35 percent), protein (36.72-38.98 percent and 34.47-37.00 percent), phytate (0.84-1.17 and 0.88-1.15 mg/ml), saponnin (94.10-97.00 and 94.17-97.00 percent) and alkaloids (43.03-45.76 and 42.08- 44.10 percent) respectively. Vitamin A ranged between 117 and 137 mg/kg and betweens 108 and 128 mg/kg, vitamin C between 100 and 118 mg/kg and between 96 and 108 mg/kg and vitamin E between 250 and 269 mg/kg and between 227 and 261 mg/kg in the first and second trials respectively. The quantities of macro and micro-nutrients recorded in S. nigrum showed that this plant is a reservoir of nutrients. Plants cultivated on clay loam, silty clay loam and loam soils accumulated elevated nutritients compositions. Investigation was made on the ability of S. nigrum cultivated on different soil texture types to synthesise phytochemicals such as phenol, flavonoid, alkaloid proanthocyanidins, tannins, saponins and antioxidant. Highest concentrations of phenolics (73.87 mg/g), flavonoids (58.41 mg/g), proanthocyanidins (875.74 mg/g), tannins (49.32 mg/g), saponins (875.74 mg/g) and alkaloid (47.50 mg/g) contents were recorded in plant sample cultivated on silty clay loam soil. Also, highest radical scavenging power using DPPH (0.0102 mg/g), ABTS (0.1062 mg/g) and FRAP (0.8395 mg/g) were recorded in plant samples grown on silty clay loam and the next high values were recorded in plant samples grown on clay loam soil. It is showed in this study that silty clay loam soil and clay loam soils are the best soil types for cultivation of S. nigrum for increased antioxidant properties/ oxygen radical scavenging activities. Investigation was made on chemical compositions and antioxidant properties of essential oil extracts of S. nigrum shoot and root cultivated on different soil textures. The Gas Chromatography-Mass Spectrometry (GC-MS) profiling revealed variations in the quality index (QI) and number of chemical constituents of the oil of S. nigrum cultivated on different soil texture types. Geraniol and citronellol were two principal components of high quality common to oil from shoots and roots fromplants cultivated on all soil types. Results of DPPH and ABTS assays of the shoot oil showed that S. nigrum cultivated on clay loam soil had the highest antioxidant power. The presence of citronellol and geraniol among the major compounds is an indicaton of the plant’s role in defensive mechanisms. The work indicated that soil texture has effect on the quality, quantity and chemical compounds synthesised in the shoots and roots of S. nigrum. Antibacterial activities and the efficacy of S. nigrum cultivated on different soil types were carried out on reference strains of 4 gram-positive and 4 gram-negative bacteria. Toxicity evaluation of the plant’s acetone extract and water extract were also assessed on lethality of brine shrimp eggs. Plant water and acetone extracts exhibited strong antibacterial activity against Pseudomona aeruginosa, acetone extracts against Bacillus cereus, Listeria and Escherichia coli. Significantly (p< 0.05) low concentration (0.25 mg/mL) of acetone extracts from plant shoot cultivated on silty clay loam and clay loam soils inhibited B. cereus and P. aeruginosa. Antimicrobial activities of extracts of plant cultivated on clay loam appeared to be more superior to extracs from plants grown on other soil types. Toxicity of the plant extracts (water and acetone) was concentration and time dependent. The LD50 values for all plant extracts were greater than 1000 mg/mL which showed they are non-toxic.
- Full Text:
- Date Issued: 2017
- Authors: Ogundola, Adijat Funke
- Date: 2017
- Subjects: Solanum Materia medica, Vegetable Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/8758 , vital:33519
- Description: Solanum nigrum L. is a wild vegetable that is highly recognised for its high nutiritional and therapeutical purposes. However, proper identification of the plant is essential not only to plant scientists but to a wide range of users. Therefore, the plant’s roots, stems and leaves cultivated on different soil types were viewed under the Scanning Electron Microscope while the leaves were further viewed under the Light Microscope. significant increase was observed in densities of stomata, guard and subsidiary cells of leaves of S. nigrum grown on silty clay loam soil. The SEM analysis revealed abundant glandular and non-glandular trichromes on both surfaces of the leaves. The glandular trichome is known to be responsible for the storage of bioactive compounds for which this plant is well known. Cultivation was embarked upon, for the availability of the plant at all times. However, propagation was by seed alone, therefore, quality seed is necessary for cultivation. Study was carried out on seeds extracted from plants growing in the wild in Alice for the seed viability, germination and seedling emergence when subjected to different soil texture types and sowing depths. The seeds were 98.3 percent viable. Highest germination (94.66 percent) was recorded in sand paper scarification, 15, 20 and 25ºC. Continuous darkness and temperatures lower than 5ºC and higher than 35ºCwere detrimental to the seeds. Silty clay loam soil and a depth of 2 cm had the highest seedling emergence 90 percent and recommended as the ideal condition for seedlings emergence. The growth, yield and physiological response of S. nigrum to sandy clay loam, silty clay loam, clay loam, loam soils and control soil (sandy loam) were investigated in the glasshouse in two separate trials. The ANOVA analysed data results indicated that plant samples on silty clay loam significantly increased in height, stem girth, plant root, leaf area, number of leaves, number of branches, number of flowers, number of fruit bunch per plant dry weight, as well as weight of fruit bunch. However, plant samples grown on clay loam and loam soils recorded increased chlorophyll and produced dark green leaves. It is conceivable that silty clay loam soils have a strong ability to support the physiological growth and the yield of S. nigrum. These soils are therefore recommended for the cultivation of this plant. S. nigrum cultivated on these soils was evaluated for proximate compositions, anti-nutrients, vitamins A, C and E and mineral compositions using standard analytical methods. Using the translocation factor, the minerals’ toxicity accumulation levels in the plant were also determined. Accumulation of proximate parameters in the first and second trials are: ash (11.25-12.25 percent and 11.14- 11.54 percent), crude fibre (19.24-19.95 percent and 18.71-19.35 percent), protein (36.72-38.98 percent and 34.47-37.00 percent), phytate (0.84-1.17 and 0.88-1.15 mg/ml), saponnin (94.10-97.00 and 94.17-97.00 percent) and alkaloids (43.03-45.76 and 42.08- 44.10 percent) respectively. Vitamin A ranged between 117 and 137 mg/kg and betweens 108 and 128 mg/kg, vitamin C between 100 and 118 mg/kg and between 96 and 108 mg/kg and vitamin E between 250 and 269 mg/kg and between 227 and 261 mg/kg in the first and second trials respectively. The quantities of macro and micro-nutrients recorded in S. nigrum showed that this plant is a reservoir of nutrients. Plants cultivated on clay loam, silty clay loam and loam soils accumulated elevated nutritients compositions. Investigation was made on the ability of S. nigrum cultivated on different soil texture types to synthesise phytochemicals such as phenol, flavonoid, alkaloid proanthocyanidins, tannins, saponins and antioxidant. Highest concentrations of phenolics (73.87 mg/g), flavonoids (58.41 mg/g), proanthocyanidins (875.74 mg/g), tannins (49.32 mg/g), saponins (875.74 mg/g) and alkaloid (47.50 mg/g) contents were recorded in plant sample cultivated on silty clay loam soil. Also, highest radical scavenging power using DPPH (0.0102 mg/g), ABTS (0.1062 mg/g) and FRAP (0.8395 mg/g) were recorded in plant samples grown on silty clay loam and the next high values were recorded in plant samples grown on clay loam soil. It is showed in this study that silty clay loam soil and clay loam soils are the best soil types for cultivation of S. nigrum for increased antioxidant properties/ oxygen radical scavenging activities. Investigation was made on chemical compositions and antioxidant properties of essential oil extracts of S. nigrum shoot and root cultivated on different soil textures. The Gas Chromatography-Mass Spectrometry (GC-MS) profiling revealed variations in the quality index (QI) and number of chemical constituents of the oil of S. nigrum cultivated on different soil texture types. Geraniol and citronellol were two principal components of high quality common to oil from shoots and roots fromplants cultivated on all soil types. Results of DPPH and ABTS assays of the shoot oil showed that S. nigrum cultivated on clay loam soil had the highest antioxidant power. The presence of citronellol and geraniol among the major compounds is an indicaton of the plant’s role in defensive mechanisms. The work indicated that soil texture has effect on the quality, quantity and chemical compounds synthesised in the shoots and roots of S. nigrum. Antibacterial activities and the efficacy of S. nigrum cultivated on different soil types were carried out on reference strains of 4 gram-positive and 4 gram-negative bacteria. Toxicity evaluation of the plant’s acetone extract and water extract were also assessed on lethality of brine shrimp eggs. Plant water and acetone extracts exhibited strong antibacterial activity against Pseudomona aeruginosa, acetone extracts against Bacillus cereus, Listeria and Escherichia coli. Significantly (p< 0.05) low concentration (0.25 mg/mL) of acetone extracts from plant shoot cultivated on silty clay loam and clay loam soils inhibited B. cereus and P. aeruginosa. Antimicrobial activities of extracts of plant cultivated on clay loam appeared to be more superior to extracs from plants grown on other soil types. Toxicity of the plant extracts (water and acetone) was concentration and time dependent. The LD50 values for all plant extracts were greater than 1000 mg/mL which showed they are non-toxic.
- Full Text:
- Date Issued: 2017
Implementation of gender policies to promote gender parity in leadership in academia : a case study of two universities in Bindura Urban Mashonaland Central Province Zimbabwe
- Authors: Mandoga, Edward
- Date: 2017
- Subjects: Women in higher education -- Zimbabwe Education, Higher -- Zimbabwe Sex discrimination in higher education -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5260 , vital:29178
- Description: The study is premised on the assumptions that the under-representation of women in leadership in academia is aggravated by weak implementation of gender policies. In light of this, the aim of the current study was to assess the nature and extent of the implementation of gender policy frameworks as a way of engendering gender parity in leadership in academia. The study was informed by the socialist-feminist theory and John Rawls’ and David Millers’ theory of social justice. The theories were chosen on the basis of their socialist-scientific approach to gender issues and also because of their resonance with the situation in Zimbabwe’s tertiary institutions. The theories were analysed within the context of Agenda 2063. The relevance of the agenda’s vision for this study is its recognition of gender equality, particularly in leadership in academia, as a critical cog for Africa’s development agenda. The researcher opted to use the qualitative approach which is embedded within the interpretivist research paradigm. The interpretivist approach makes use of qualitative methods of data collection, presentation and analysis. Data were generated from a sample of twenty four lecturers, two vice-chancellors, two pro-vice-chancellors and two registrars from two universities, a private church-run institution and a state university, mainly through interviews. Data were also generated through focus group discussions and document analysis. Data from documents were used to buttress data from the interviews and focus group discussions. The findings of this study showed that the male-management norm dominated in almost every strategic section of the structures of the two institutions. This was attributable to weak implementation of gender policies. The failure of the gender policies to bring a visible change to the institutional landscape in terms of gender equality was a result of an interplay of personal, cultural and organisational factors. Some of the factors that thwarted women’s career progression to leadership positions included, lack of inspiration from role models, lack of support from colleagues, lack of training in leadership, and the Zimbabwe Council of Higher Education’s (ZIMCHE) indiscriminate policy on recruitment of staff members. All the factors however, were encapsulated within the patriarchal stereotypical conception of a women as fit for domesticity. Within the same conception, men were considered to be imbued with the clout and traits consistent with leadership demands. Studies carried out elsewhere in Zimbabwe and outside the boarders of Zimbabwe have yielded similar results. This explains the continuing and relentless nature of gender inequality in academic institutions. In order to increase the participation of women in leadership positions, the study recommends the following: establishment of a monitoring and evaluation exercise designed to audit the effectiveness of the gender policies; establishment of a review of the university programmes with the aim of establishing or intensifying training programmes in academic leadership and management; establishment of a scholarship and research fund to encourage women to undertake higher degrees studies, and the intense application of affirmative action policies and gender mainstreaming in the universities.
- Full Text:
- Date Issued: 2017
- Authors: Mandoga, Edward
- Date: 2017
- Subjects: Women in higher education -- Zimbabwe Education, Higher -- Zimbabwe Sex discrimination in higher education -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5260 , vital:29178
- Description: The study is premised on the assumptions that the under-representation of women in leadership in academia is aggravated by weak implementation of gender policies. In light of this, the aim of the current study was to assess the nature and extent of the implementation of gender policy frameworks as a way of engendering gender parity in leadership in academia. The study was informed by the socialist-feminist theory and John Rawls’ and David Millers’ theory of social justice. The theories were chosen on the basis of their socialist-scientific approach to gender issues and also because of their resonance with the situation in Zimbabwe’s tertiary institutions. The theories were analysed within the context of Agenda 2063. The relevance of the agenda’s vision for this study is its recognition of gender equality, particularly in leadership in academia, as a critical cog for Africa’s development agenda. The researcher opted to use the qualitative approach which is embedded within the interpretivist research paradigm. The interpretivist approach makes use of qualitative methods of data collection, presentation and analysis. Data were generated from a sample of twenty four lecturers, two vice-chancellors, two pro-vice-chancellors and two registrars from two universities, a private church-run institution and a state university, mainly through interviews. Data were also generated through focus group discussions and document analysis. Data from documents were used to buttress data from the interviews and focus group discussions. The findings of this study showed that the male-management norm dominated in almost every strategic section of the structures of the two institutions. This was attributable to weak implementation of gender policies. The failure of the gender policies to bring a visible change to the institutional landscape in terms of gender equality was a result of an interplay of personal, cultural and organisational factors. Some of the factors that thwarted women’s career progression to leadership positions included, lack of inspiration from role models, lack of support from colleagues, lack of training in leadership, and the Zimbabwe Council of Higher Education’s (ZIMCHE) indiscriminate policy on recruitment of staff members. All the factors however, were encapsulated within the patriarchal stereotypical conception of a women as fit for domesticity. Within the same conception, men were considered to be imbued with the clout and traits consistent with leadership demands. Studies carried out elsewhere in Zimbabwe and outside the boarders of Zimbabwe have yielded similar results. This explains the continuing and relentless nature of gender inequality in academic institutions. In order to increase the participation of women in leadership positions, the study recommends the following: establishment of a monitoring and evaluation exercise designed to audit the effectiveness of the gender policies; establishment of a review of the university programmes with the aim of establishing or intensifying training programmes in academic leadership and management; establishment of a scholarship and research fund to encourage women to undertake higher degrees studies, and the intense application of affirmative action policies and gender mainstreaming in the universities.
- Full Text:
- Date Issued: 2017
Implementation of the policy on religious equity in public schools in the East London Education District : towards a framework for religious diversity
- Makasi, Cordelia Noma-Abysinia
- Authors: Makasi, Cordelia Noma-Abysinia
- Date: 2017
- Subjects: Religious education -- South Africa -- Eastern Cape Religion and state -- South Africa -- Eastern Cape Christianity and politics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5014 , vital:28935
- Description: The study sought to establish the implementation of the policy on religious equity in public schools in the East London Education district in the Eastern Cape Province of South Africa. Underpinned by Van Meter and Van Horn (2015) with implementation and conceptual theory and also a theory on opportunity to learn and school performance by Van Der Grift and Houtveen(2006), the study was located in the pragmatist research paradigm and followed a mixed methods approach and concurrent triangulation design. The research sampling technique was random for high school learners in selected schools and purposeful for principals, heads of departments, teachers and provincial education officials. Three methods were employed to collect data from selected public schools and from the provincial office namely; semi-structured interviews, individual interviews and observation. Quantitative data were analysed statistically and presented in the form of descriptive statistics. Qualitative data were analysed using the thematic content analysis technique. Major findings of the study are that teachers and principals understood the concept religious equity and had a fair understanding of the policy on religious equity. Schools were predominantly Christian-oriented in terms of religious practices and there were no recorded cases of religious conflict. Learners of minority religions were not compelled to attend Christian religious functions in schools and were allowed to attend their own religious functions outside school. This was established from the fact that participants cited freedom of religion as being exercised in schools. However, it was further established that there was no strategic monitoring and support for teachers in the implementation of religious equity. There were also no deliberate measures and strategies for the implementation of religious equity suggesting challenges and inconsistencies in the implementation of the policy. While there were notable challenges in the implementation of the policy, due to resistance of stakeholders to change, schools had great opportunities which could be utilized to enhance the implementation of the policy on religious equity. The study concludes by noting that, while key policy implementers had an understanding of religious equity, the situation on the ground revealed challenges and inconsistencies in the implementation of the policy which resulted in a Christian-dominated school environment at the expense of minority religions The study recommends, among other things, that that religious equity be adhered to as enshrined in the Constitution of South Africa of 1996 and the South African Schools Act of 1996. The teaching and learning environment should include Religion Education as per prescription by National Policy on Religion Education of 2003, that monitoring and support of teachers be done, and that community involvement with policy development be considered crucial as well as moral education teaching in schools. A framework for enhancing implementation of the policy on religious equity is also proposed.
- Full Text:
- Date Issued: 2017
- Authors: Makasi, Cordelia Noma-Abysinia
- Date: 2017
- Subjects: Religious education -- South Africa -- Eastern Cape Religion and state -- South Africa -- Eastern Cape Christianity and politics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5014 , vital:28935
- Description: The study sought to establish the implementation of the policy on religious equity in public schools in the East London Education district in the Eastern Cape Province of South Africa. Underpinned by Van Meter and Van Horn (2015) with implementation and conceptual theory and also a theory on opportunity to learn and school performance by Van Der Grift and Houtveen(2006), the study was located in the pragmatist research paradigm and followed a mixed methods approach and concurrent triangulation design. The research sampling technique was random for high school learners in selected schools and purposeful for principals, heads of departments, teachers and provincial education officials. Three methods were employed to collect data from selected public schools and from the provincial office namely; semi-structured interviews, individual interviews and observation. Quantitative data were analysed statistically and presented in the form of descriptive statistics. Qualitative data were analysed using the thematic content analysis technique. Major findings of the study are that teachers and principals understood the concept religious equity and had a fair understanding of the policy on religious equity. Schools were predominantly Christian-oriented in terms of religious practices and there were no recorded cases of religious conflict. Learners of minority religions were not compelled to attend Christian religious functions in schools and were allowed to attend their own religious functions outside school. This was established from the fact that participants cited freedom of religion as being exercised in schools. However, it was further established that there was no strategic monitoring and support for teachers in the implementation of religious equity. There were also no deliberate measures and strategies for the implementation of religious equity suggesting challenges and inconsistencies in the implementation of the policy. While there were notable challenges in the implementation of the policy, due to resistance of stakeholders to change, schools had great opportunities which could be utilized to enhance the implementation of the policy on religious equity. The study concludes by noting that, while key policy implementers had an understanding of religious equity, the situation on the ground revealed challenges and inconsistencies in the implementation of the policy which resulted in a Christian-dominated school environment at the expense of minority religions The study recommends, among other things, that that religious equity be adhered to as enshrined in the Constitution of South Africa of 1996 and the South African Schools Act of 1996. The teaching and learning environment should include Religion Education as per prescription by National Policy on Religion Education of 2003, that monitoring and support of teachers be done, and that community involvement with policy development be considered crucial as well as moral education teaching in schools. A framework for enhancing implementation of the policy on religious equity is also proposed.
- Full Text:
- Date Issued: 2017
Indigenous and traditional musics in the school classroom : a re-evaluation of the South African Indigenous African Music (IAM) curriculum
- Authors: McConnachie, Boudina
- Date: 2017
- Subjects: Ethnomusicology , Indigenous people -- Music , Music -- Instruction and study -- Africa , Music -- Instruction and study -- Curricula -- Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21182 , http://hdl.handle.net/10962/6806
- Description: Musical ideals set by European standards and values, entrenched through colonial oppression and promoted by the continued veneration of Western culture need to be re-evaluated. Despite the intention of the ANC government, through the Department of Basic Education's Curriculum and Assessment Policy Statement music curricula, to integrate Indigenous Knowledge and musics into the South African classroom, evidence shows that opportunities to do so are not seized. With reference to the proclaimed values of an African sensibility in the model of the South African music education curriculum, the history of its development and the current pedagogical movement towards transformation in the production of knowledge and the inclusion of Indigenous Knowledge (IK), this thesis questions why teachers in government schools in South Africa are not executing the Indigenous African Music (IAM) syllabus in the CAPS FET music curriculum. Taking the history of music education and the development of curriculum models and frameworks into account, it interrogates what strategies could improve the application of the current music curriculum in government schools in South Africa. These questions are addressed in the thesis by way of a discussion of the music curriculum and what its praxis in the classroom reveals about its efficacy, through observations and personal experiences, the observations of teachers and student teachers, a comparison with the experience in Zimbabwe, and an analysis of the music curriculum as it is currently devised and implemented. Straddling three methodological approaches, namely the ethnographic, the autoethnographic and the action research approach this study finds that the CAPS FET music curriculum does provide realistic opportunities to engage with African Indigenous and traditional music. This, however, is dependent upon the training of the teacher, facilities available in the classroom and the prior knowledge of the learner. A fundamental flaw of this curriculum is the approach to practical assessment of Indigenous and traditional African musics and the lack of assessment criteria and practical guidelines. In addition, the findings suggest that the fault regarding implementation of the curriculum lies in the training of students (who become teachers) at tertiary level, where an integrated approach to skills development regarding Indigenous African music is suggested.
- Full Text:
- Date Issued: 2017
- Authors: McConnachie, Boudina
- Date: 2017
- Subjects: Ethnomusicology , Indigenous people -- Music , Music -- Instruction and study -- Africa , Music -- Instruction and study -- Curricula -- Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21182 , http://hdl.handle.net/10962/6806
- Description: Musical ideals set by European standards and values, entrenched through colonial oppression and promoted by the continued veneration of Western culture need to be re-evaluated. Despite the intention of the ANC government, through the Department of Basic Education's Curriculum and Assessment Policy Statement music curricula, to integrate Indigenous Knowledge and musics into the South African classroom, evidence shows that opportunities to do so are not seized. With reference to the proclaimed values of an African sensibility in the model of the South African music education curriculum, the history of its development and the current pedagogical movement towards transformation in the production of knowledge and the inclusion of Indigenous Knowledge (IK), this thesis questions why teachers in government schools in South Africa are not executing the Indigenous African Music (IAM) syllabus in the CAPS FET music curriculum. Taking the history of music education and the development of curriculum models and frameworks into account, it interrogates what strategies could improve the application of the current music curriculum in government schools in South Africa. These questions are addressed in the thesis by way of a discussion of the music curriculum and what its praxis in the classroom reveals about its efficacy, through observations and personal experiences, the observations of teachers and student teachers, a comparison with the experience in Zimbabwe, and an analysis of the music curriculum as it is currently devised and implemented. Straddling three methodological approaches, namely the ethnographic, the autoethnographic and the action research approach this study finds that the CAPS FET music curriculum does provide realistic opportunities to engage with African Indigenous and traditional music. This, however, is dependent upon the training of the teacher, facilities available in the classroom and the prior knowledge of the learner. A fundamental flaw of this curriculum is the approach to practical assessment of Indigenous and traditional African musics and the lack of assessment criteria and practical guidelines. In addition, the findings suggest that the fault regarding implementation of the curriculum lies in the training of students (who become teachers) at tertiary level, where an integrated approach to skills development regarding Indigenous African music is suggested.
- Full Text:
- Date Issued: 2017
Individual-related factors influencing knowledge-sharing intention in knowledge-intensive businesses
- Authors: Van Greunen, Conrad
- Date: 2017
- Subjects: Knowledge management Intellectual capital -- Management , Management -- Information services Organizational learning
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/21274 , vital:29469
- Description: It has become generally accepted to refer to today‟s global economy as a knowledge-based economy, since knowledge has increasingly become the resource, instead of a resource for wealth creation. The ability of businesses to harness the potential of intangible assets such as knowledge has become far more decisive than their ability to manage physical assets. In the implementation of knowledge management activities, knowledge sharing is recognised as an integral task and key enabler of knowledge management. Although knowledge sharing is regarded as one of the most crucial factors in the effective management of knowledge, in knowledge-intensive businesses in particular, it has also been established that most employees are reluctant to share knowledge. Research further confirms that the factors that promote or discourage knowledge-sharing behaviour in businesses are poorly understood and that knowledge management systems fail as a result of the misunderstanding of individual characteristics that could influence knowledge sharing. Moreover, the focus of knowledge-sharing literature, in terms of the unit of analysis, is rarely at an individual/micro level, although the role of individuals in the knowledge-sharing process is critical as tacit knowledge resides within the individual and knowledge sharing starts with individuals. Given the importance of understanding knowledge sharing of individuals in knowledge-intensive businesses – but noting the lack of existing systematic, integrated research that focuses on individual-related factors influencing knowledge sharing – the purpose of this study was to fill the gap in the current literature. As such, the primary objective of this research was to identify and empirically investigate the individual-related factors influencing the Knowledge-sharing intention of individual employees in knowledge-intensive businesses. The literature review revealed twelve constructs, namely Individuals’ awareness, Intrinsic motivation, Extrinsic motivation, Transactional psychological contract breach, Relational psychological contract breach, Relationship conflict, Task conflict, Extraversion, Neuroticism, Openness to experience, Agreeableness and Conscientiousness that could influence the dependent variable Knowledge-sharing intention in knowledge-intensive businesses. Various moderating relationships between the dependent and independent variables were also proposed, while seven demographic variables (Age, Gender, Language, Highest qualification, Ethnic background, Organisational tenure and Job tenure of the respondent) were identified as potential control variables. Each construct in the hypothesised model of individual-related factors influencing Knowledge-sharing intention was defined and operationalised using items sourced from validated measuring instruments in previous studies. Several self-generated items based on secondary sources were also formulated. A structured questionnaire was made available to respondents identified by means of the convenience sampling technique, and the data collected from 597 usable questionnaires was subjected to various statistical analyses. An exploratory factor analysis (EFA) was conducted which confirmed the unique factors present in the data, and Cronbach-alpha coefficients were calculated to confirm the reliability of the measuring instrument. Structural equation modelling (SEM) was the main statistical procedure used to test the significance of the relationships hypothesised between the various independent and dependent variables. A subset of SEM, namely general linear modelling (GLM) was used to determine the influence of selected demographic variables on Knowledge-sharing intention and to assess various moderating relationships as proposed in the hypothesised model. The main findings of this study were that personality traits are strong predictors of individual employees‟ willingness to share knowledge, and that the maturity of individuals, in terms of realising the significance and value of sharing their knowledge with others, and in recognising the intrinsic benefits of sharing, influence Knowledge-sharing intention. The main limitations of the study were the use of a convenience sampling technique to collect the data, as well as the dependence of self-report by respondents, which could lead to response bias. This study has added to the body of knowledge management research, in particular knowledge-sharing research, by investigating selected individual-related factors influencing the Knowledge-sharing intention of individuals in a particular subset of businesses, namely knowledge-intensive businesses, and focusing on a particular type of knowledge, namely tacit knowledge. From a business‟s perspective, this study offers recommendations and suggestions for managing these individual-related factors in such a way as to increase knowledge sharing among employees, and as a result, the effectiveness and competitive advantage of knowledge-intensive businesses.
- Full Text:
- Date Issued: 2017
Individual-related factors influencing knowledge-sharing intention in knowledge-intensive businesses
- Authors: Van Greunen, Conrad
- Date: 2017
- Subjects: Knowledge management Intellectual capital -- Management , Management -- Information services Organizational learning
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/21274 , vital:29469
- Description: It has become generally accepted to refer to today‟s global economy as a knowledge-based economy, since knowledge has increasingly become the resource, instead of a resource for wealth creation. The ability of businesses to harness the potential of intangible assets such as knowledge has become far more decisive than their ability to manage physical assets. In the implementation of knowledge management activities, knowledge sharing is recognised as an integral task and key enabler of knowledge management. Although knowledge sharing is regarded as one of the most crucial factors in the effective management of knowledge, in knowledge-intensive businesses in particular, it has also been established that most employees are reluctant to share knowledge. Research further confirms that the factors that promote or discourage knowledge-sharing behaviour in businesses are poorly understood and that knowledge management systems fail as a result of the misunderstanding of individual characteristics that could influence knowledge sharing. Moreover, the focus of knowledge-sharing literature, in terms of the unit of analysis, is rarely at an individual/micro level, although the role of individuals in the knowledge-sharing process is critical as tacit knowledge resides within the individual and knowledge sharing starts with individuals. Given the importance of understanding knowledge sharing of individuals in knowledge-intensive businesses – but noting the lack of existing systematic, integrated research that focuses on individual-related factors influencing knowledge sharing – the purpose of this study was to fill the gap in the current literature. As such, the primary objective of this research was to identify and empirically investigate the individual-related factors influencing the Knowledge-sharing intention of individual employees in knowledge-intensive businesses. The literature review revealed twelve constructs, namely Individuals’ awareness, Intrinsic motivation, Extrinsic motivation, Transactional psychological contract breach, Relational psychological contract breach, Relationship conflict, Task conflict, Extraversion, Neuroticism, Openness to experience, Agreeableness and Conscientiousness that could influence the dependent variable Knowledge-sharing intention in knowledge-intensive businesses. Various moderating relationships between the dependent and independent variables were also proposed, while seven demographic variables (Age, Gender, Language, Highest qualification, Ethnic background, Organisational tenure and Job tenure of the respondent) were identified as potential control variables. Each construct in the hypothesised model of individual-related factors influencing Knowledge-sharing intention was defined and operationalised using items sourced from validated measuring instruments in previous studies. Several self-generated items based on secondary sources were also formulated. A structured questionnaire was made available to respondents identified by means of the convenience sampling technique, and the data collected from 597 usable questionnaires was subjected to various statistical analyses. An exploratory factor analysis (EFA) was conducted which confirmed the unique factors present in the data, and Cronbach-alpha coefficients were calculated to confirm the reliability of the measuring instrument. Structural equation modelling (SEM) was the main statistical procedure used to test the significance of the relationships hypothesised between the various independent and dependent variables. A subset of SEM, namely general linear modelling (GLM) was used to determine the influence of selected demographic variables on Knowledge-sharing intention and to assess various moderating relationships as proposed in the hypothesised model. The main findings of this study were that personality traits are strong predictors of individual employees‟ willingness to share knowledge, and that the maturity of individuals, in terms of realising the significance and value of sharing their knowledge with others, and in recognising the intrinsic benefits of sharing, influence Knowledge-sharing intention. The main limitations of the study were the use of a convenience sampling technique to collect the data, as well as the dependence of self-report by respondents, which could lead to response bias. This study has added to the body of knowledge management research, in particular knowledge-sharing research, by investigating selected individual-related factors influencing the Knowledge-sharing intention of individuals in a particular subset of businesses, namely knowledge-intensive businesses, and focusing on a particular type of knowledge, namely tacit knowledge. From a business‟s perspective, this study offers recommendations and suggestions for managing these individual-related factors in such a way as to increase knowledge sharing among employees, and as a result, the effectiveness and competitive advantage of knowledge-intensive businesses.
- Full Text:
- Date Issued: 2017
Information and propaganda in the federation of Rhodesia and Nyasaland with special reference to print and radio propaganda for Africans, 1953-1963
- Authors: Zimudzi, Tapiwa Brown
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6957 , vital:21204
- Description: This thesis contributes to the history of the information and propaganda policy and practice of the government of the Federation of Rhodesia and Nyasaland by examining this government's pro-Federation print and radio propaganda for Africans in the Federation. Using a multi-theoretical approach, it analyses the character of this propaganda, highlighting its main methods and themes as well as the policy considerations, plus political and economic circumstances that gave rise to it. It also discusses how Africans in the Federation reacted to this propaganda and assesses its effectiveness in gaining the support of these Africans for Federation and the policies of the Federal government. The thesis argues that Federal government propaganda aimed at gaining the support of Africans for Federation was predominantly panic-driven propaganda and was the product of an information panic that lay at the heart of the very idea of Federation itself. This information panic arose out of the Federal government's belated recognition of the strength of African opposition to Federation and of how this opposition seriously threatened the continued survival of the Federation. It is also argued that this panic-driven pro-Federation propaganda elicited largely hostile reactions from the majority of Africans in the Federation and failed to persuade them to support Federation.
- Full Text:
- Date Issued: 2017
- Authors: Zimudzi, Tapiwa Brown
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6957 , vital:21204
- Description: This thesis contributes to the history of the information and propaganda policy and practice of the government of the Federation of Rhodesia and Nyasaland by examining this government's pro-Federation print and radio propaganda for Africans in the Federation. Using a multi-theoretical approach, it analyses the character of this propaganda, highlighting its main methods and themes as well as the policy considerations, plus political and economic circumstances that gave rise to it. It also discusses how Africans in the Federation reacted to this propaganda and assesses its effectiveness in gaining the support of these Africans for Federation and the policies of the Federal government. The thesis argues that Federal government propaganda aimed at gaining the support of Africans for Federation was predominantly panic-driven propaganda and was the product of an information panic that lay at the heart of the very idea of Federation itself. This information panic arose out of the Federal government's belated recognition of the strength of African opposition to Federation and of how this opposition seriously threatened the continued survival of the Federation. It is also argued that this panic-driven pro-Federation propaganda elicited largely hostile reactions from the majority of Africans in the Federation and failed to persuade them to support Federation.
- Full Text:
- Date Issued: 2017
Invasive alien plants and rural livelihoods: a case of Gwanda District, Zimbabwe
- Authors: Dube, Nqobizitha
- Date: 2017
- Subjects: Cylindropuntia fulgida , Invasive plants -- Economic aspects , Invasive plants -- Control , Invasive plants -- Economic aspects -- Zimbabwe , Ecosystem services -- Zimbabwe , Environmental policy -- Zimbabwe , Ecosystem management -- Zimbabwe , Cactus -- Economic aspects -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/4368 , vital:20653
- Description: Biodiversity is the cornerstone of ecosystem functioning and the realisation that most rural African community livelihoods are directly dependent on ecosystem goods and services warrants its conservation. Invasive alien plants threaten biodiversity and compromise the ecosystem's ability to provide goods and services for rural communities, thereby negatively affecting livelihood strategies. Information on IAPs is lacking in most African countries, thus, the livelihood effects of Invasive Alien Plants (IAPs) are not clearly understood. In Zimbabwe, Cylindropuntia fulgida var. fulgida (Cff) has invaded Gwanda district in the Matabeleland south province compromising local household capital assets that contribute to livelihood strategies and altering the ecosystem. This study exposed the rural worldview of the environment, the effect that Cff has on local livelihood strategies and the effectiveness environmental management institutions in rural Gwanda district. The study followed a post positivist paradigm. The impacts of IAPs on rural communities in Zimbabwe were analysed by looking at the livelihood stresses that arise because of Cff. The research used multi-stage sampling to select a representative sample of respondents. Primary data was collected using semi-structured questionnaires, group discussion and key informant guides. Furthermore, document analysis was conducted to collect secondary data. The data analysis process used Computer packages Microsoft Excel, SPSS and NVIVO. Results showed that livelihood benefits that species in the natural environment provide strongly influence environmental perceptions of rural African communities. Additionally, the study showed that Cff compromises the local ecosystem and reduces its ability to support the dominant livelihoods in the study area. The long-term result of such a situation in the absence of control is increased poverty and the failure to realise sustainable development. However, results indicated that IAPs could also improve the poverty situation of a community before they have reached the threshold points. It is therefore imperative to know the threshold points of an invasive plant in order to ascertain the efficient point to intervene. The study also showed that benefits of invasive plants accrue to different members of a society at different times (private/public). This knowledge allows the adoption of efficient and effective control strategies.
- Full Text:
- Date Issued: 2017
- Authors: Dube, Nqobizitha
- Date: 2017
- Subjects: Cylindropuntia fulgida , Invasive plants -- Economic aspects , Invasive plants -- Control , Invasive plants -- Economic aspects -- Zimbabwe , Ecosystem services -- Zimbabwe , Environmental policy -- Zimbabwe , Ecosystem management -- Zimbabwe , Cactus -- Economic aspects -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/4368 , vital:20653
- Description: Biodiversity is the cornerstone of ecosystem functioning and the realisation that most rural African community livelihoods are directly dependent on ecosystem goods and services warrants its conservation. Invasive alien plants threaten biodiversity and compromise the ecosystem's ability to provide goods and services for rural communities, thereby negatively affecting livelihood strategies. Information on IAPs is lacking in most African countries, thus, the livelihood effects of Invasive Alien Plants (IAPs) are not clearly understood. In Zimbabwe, Cylindropuntia fulgida var. fulgida (Cff) has invaded Gwanda district in the Matabeleland south province compromising local household capital assets that contribute to livelihood strategies and altering the ecosystem. This study exposed the rural worldview of the environment, the effect that Cff has on local livelihood strategies and the effectiveness environmental management institutions in rural Gwanda district. The study followed a post positivist paradigm. The impacts of IAPs on rural communities in Zimbabwe were analysed by looking at the livelihood stresses that arise because of Cff. The research used multi-stage sampling to select a representative sample of respondents. Primary data was collected using semi-structured questionnaires, group discussion and key informant guides. Furthermore, document analysis was conducted to collect secondary data. The data analysis process used Computer packages Microsoft Excel, SPSS and NVIVO. Results showed that livelihood benefits that species in the natural environment provide strongly influence environmental perceptions of rural African communities. Additionally, the study showed that Cff compromises the local ecosystem and reduces its ability to support the dominant livelihoods in the study area. The long-term result of such a situation in the absence of control is increased poverty and the failure to realise sustainable development. However, results indicated that IAPs could also improve the poverty situation of a community before they have reached the threshold points. It is therefore imperative to know the threshold points of an invasive plant in order to ascertain the efficient point to intervene. The study also showed that benefits of invasive plants accrue to different members of a society at different times (private/public). This knowledge allows the adoption of efficient and effective control strategies.
- Full Text:
- Date Issued: 2017
Investigating herbivory and plant origin on tall-statured grasses in South Africa
- Authors: Canavan, Kim
- Date: 2017
- Subjects: Insects as biological pest control agents -- South Africa , Arundo donax , Giant reed -- South Africa , Giant reed -- Biological control -- South Africa , Phragmites australis , Phragmites mauritianus , Phragmites , Tetramesa romana , Biological invasions -- South Africa , Wasps -- Host plants , Wasps -- South Africa
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6147 , vital:21051
- Description: South African riparian zones have been heavily degraded through anthropogenic activities such as dam construction and extraction of water for irrigation, which has resulted in a loss of ecosystem services and functioning. A consequence of such disturbances to riparian areas is in their susceptibility to invasive alien species (IAS). One such IAS is the giant reed, Arundo donax L. (Poaceae), introduced to South Africa in the 1700s largely for erosion control. Arundo donax has since greatly expanded in the country and is now one of the most abundant IAS. Arundo donax has been found to displace native vegetation and in South Africa this will most likely lead to the displacement of the native tall-statured grasses, Phragmites australis (Cav.) Trin. ex Steud. and Phragmites mauritianus Kunth. This study aimed to enhance our understanding of the tall-statured grasses A. donax, P. australis and P. mauritianus to better manage them in riparian areas. For A. donax, biological control is seen as the most viable option to control stands in the long-term. However, before such a programme is put in place, it is important to first collect baseline data that can be used to guide the direction of the biological control project in South Africa. For the Phragmites spp., despite being a dominant vegetative type in riparian areas, very little is known about their status in South Africa. Furthermore, there have been increasing reports of both Phragmites species having an expansion of their range and abundance. In North America, there has been a similar trend of reed expansion and through molecular work it was determined that a cryptic invasion has occurred with the introduction of an invasive non-native haplotype from Europe. It is therefore unknown if Phragmites spp. populations are expanding due to anthropogenic activities or due to a cryptic invasion. To address these shortfalls in knowledge the study investigated the tall-statured grasses in two parts; firstly, molecular techniques are used to explore the plant origin and genetic diversity of A. donax, P. australis and P. mauritianus and secondly using the Enemy Release Hypothesis as a framework, herbivore assemblages for each reed was determined across their distribution in South Africa. Molecular-techniques determined that both P. australis and P. mauritianus had only one haplotype - known as haplotype K and haplotype V respectively, across their distribution. For P. australis, haplotype K shares a close connection with populations from a Mediterranean lineage and this was further confirmed with a shared grass-waxy band. The direction and timing of genetic exchange between the two regions could not be ascertained and thus still remains unknown. Microsatellite analysis determined that both Phragmites spp. had a high genetic diversity compared to worldwide lineages. With no evidence of any cryptic invasions of haplotypes from other regions, both Phragmites spp. populations are likely to be native to South Africa. For A. donax all populations across South Africa were determined to be haplotype M1; a cosmopolitan haplotype that has an ancient native range in Afghanistan and Pakistan (Indus Valley). Populations were found to have no genetic diversity and thus can be considered one clone. A pre-introductory survey determined a list of herbivores associated with each tall- statured grass. For A. donax, a total of seven herbivores were found. Of these, one herbivore, a galling wasp, Tetramesa romana Walker (Hymenoptera: Eurytomidae) was found to be highly abundant and widely distributed in South Africa. Tetramesa romana is already a biological control agent in North America and thus is likely exerting some pressure on A. donax populations in South Africa. For both Phragmites spp. a total of ten herbivores were found, although having higher species richness compared to A. donax, when compared to other regions, these native species have a relatively low species richness. Providing baseline data on plant origin, genetic diversity and herbivory on A. donax, P. australis and P. mauritianus has provided important information on managing these species in riparian ecosystems in South Africa. For the Phragmites spp. with no evidence of any cryptic invasions, it is recommended that reed stands continue to be managed as native species. Phragmites spp. are important dominant vegetative species and thus should be protected; however, if reed stands become expansive, control methods can be put in place to focus on managing spread and abundance. For A. donax, this study was able to provide pivotal information in guiding the biological control programme. By determining the ancient lineage of South African populations, research can be focused in this area to find potential biological control agents. Lastly, the pre-introductory survey determined that a biological control agent, T. romana was already established with an unknown introduction and also highlighted potential plant parts that should be targeted. In particular, no rhizome feeding herbivores were found in South Africa and therefore this highlights an important niche that should be explored in biological control agents.
- Full Text:
- Date Issued: 2017
- Authors: Canavan, Kim
- Date: 2017
- Subjects: Insects as biological pest control agents -- South Africa , Arundo donax , Giant reed -- South Africa , Giant reed -- Biological control -- South Africa , Phragmites australis , Phragmites mauritianus , Phragmites , Tetramesa romana , Biological invasions -- South Africa , Wasps -- Host plants , Wasps -- South Africa
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/6147 , vital:21051
- Description: South African riparian zones have been heavily degraded through anthropogenic activities such as dam construction and extraction of water for irrigation, which has resulted in a loss of ecosystem services and functioning. A consequence of such disturbances to riparian areas is in their susceptibility to invasive alien species (IAS). One such IAS is the giant reed, Arundo donax L. (Poaceae), introduced to South Africa in the 1700s largely for erosion control. Arundo donax has since greatly expanded in the country and is now one of the most abundant IAS. Arundo donax has been found to displace native vegetation and in South Africa this will most likely lead to the displacement of the native tall-statured grasses, Phragmites australis (Cav.) Trin. ex Steud. and Phragmites mauritianus Kunth. This study aimed to enhance our understanding of the tall-statured grasses A. donax, P. australis and P. mauritianus to better manage them in riparian areas. For A. donax, biological control is seen as the most viable option to control stands in the long-term. However, before such a programme is put in place, it is important to first collect baseline data that can be used to guide the direction of the biological control project in South Africa. For the Phragmites spp., despite being a dominant vegetative type in riparian areas, very little is known about their status in South Africa. Furthermore, there have been increasing reports of both Phragmites species having an expansion of their range and abundance. In North America, there has been a similar trend of reed expansion and through molecular work it was determined that a cryptic invasion has occurred with the introduction of an invasive non-native haplotype from Europe. It is therefore unknown if Phragmites spp. populations are expanding due to anthropogenic activities or due to a cryptic invasion. To address these shortfalls in knowledge the study investigated the tall-statured grasses in two parts; firstly, molecular techniques are used to explore the plant origin and genetic diversity of A. donax, P. australis and P. mauritianus and secondly using the Enemy Release Hypothesis as a framework, herbivore assemblages for each reed was determined across their distribution in South Africa. Molecular-techniques determined that both P. australis and P. mauritianus had only one haplotype - known as haplotype K and haplotype V respectively, across their distribution. For P. australis, haplotype K shares a close connection with populations from a Mediterranean lineage and this was further confirmed with a shared grass-waxy band. The direction and timing of genetic exchange between the two regions could not be ascertained and thus still remains unknown. Microsatellite analysis determined that both Phragmites spp. had a high genetic diversity compared to worldwide lineages. With no evidence of any cryptic invasions of haplotypes from other regions, both Phragmites spp. populations are likely to be native to South Africa. For A. donax all populations across South Africa were determined to be haplotype M1; a cosmopolitan haplotype that has an ancient native range in Afghanistan and Pakistan (Indus Valley). Populations were found to have no genetic diversity and thus can be considered one clone. A pre-introductory survey determined a list of herbivores associated with each tall- statured grass. For A. donax, a total of seven herbivores were found. Of these, one herbivore, a galling wasp, Tetramesa romana Walker (Hymenoptera: Eurytomidae) was found to be highly abundant and widely distributed in South Africa. Tetramesa romana is already a biological control agent in North America and thus is likely exerting some pressure on A. donax populations in South Africa. For both Phragmites spp. a total of ten herbivores were found, although having higher species richness compared to A. donax, when compared to other regions, these native species have a relatively low species richness. Providing baseline data on plant origin, genetic diversity and herbivory on A. donax, P. australis and P. mauritianus has provided important information on managing these species in riparian ecosystems in South Africa. For the Phragmites spp. with no evidence of any cryptic invasions, it is recommended that reed stands continue to be managed as native species. Phragmites spp. are important dominant vegetative species and thus should be protected; however, if reed stands become expansive, control methods can be put in place to focus on managing spread and abundance. For A. donax, this study was able to provide pivotal information in guiding the biological control programme. By determining the ancient lineage of South African populations, research can be focused in this area to find potential biological control agents. Lastly, the pre-introductory survey determined that a biological control agent, T. romana was already established with an unknown introduction and also highlighted potential plant parts that should be targeted. In particular, no rhizome feeding herbivores were found in South Africa and therefore this highlights an important niche that should be explored in biological control agents.
- Full Text:
- Date Issued: 2017
IsiXhosa ulwimi lwabantu abangesosininzi eZimbabwe: ukuphila nokulondolozwa kwaso
- Authors: Kunju, Hleze Welsh
- Date: 2017
- Subjects: Language policy Zimbabwe , Xhosa (African people) Zimbabwe , Xhosa (African people) Social life and customs Zimbabwe , Xhosa language Zimbabwe , Language spread , Culture diffusion
- Language: Xhosa
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7370 , vital:21250
- Description: Kuqikelelwa ukuba kukho amaXhosa (amaMfengu) angcambu zawo ziseMzantsi Afrika amalunga namakhulu amabini amawaka azinze eZimbabwe ukususela kwiminyaka yoo-18001900. Uninzi lwawo lufumaneka eMbembesi, eFort Rixon, eFilabusi, eKenilworth naseMotapa eBubi. Imbali ithi, inxalenye yala maXhosa ngawaseMpuma Kapa, afudukela eZimbabwe noCecil John Rhodes eqhuba iinqwelo kananjalo esebenzela uRhodes ngeminyaka yoo-1800. Le thisisi yongeza kulwazi olutsha malunga nala maXhosa aseZimbabwe, iphonononga ubume bolwimi, imbali nemvelaphi yala maXhosa azinze eZimbabwe lo gama ibonisa ukuba naphantsi kwayiphi na imeko, ulwimi luyakwazi ukuphila ngaphaya kwemida. Ulwimi nenkcubeko zingumtya nethunga, ngenxa yoko le thisisi yayame kakhulu kwinkcubeko. Iethinografi nembali yomlomo zisetyenziswe njengendlela okanye imethodi yokuqhuba olu phando. Iziphumo zolu phando zibonisa ukuba umhlaba, inkcubeko, iingoma, inkolo yobuKrestu, iincwadi ezingaphelelwa xesha zoncwadi lwesiXhosa, iteknoloji namakhasi onxibelelwano nomgaqo-siseko waseZimbabwe (2013) zibe zizixhobo ezidlale indima ebonakalayo ekulondolozeni nasekuphuhliseni isiXhosa eZimbabwe. Imiba ephathelele kumgaqo-nkqubo wesiXhosa eZimbabwe nayo iyaphononongwa, njengokuba isiXhosa ilulwimi oluthathwa njengolusesikweni eZimbabwe.Kusetyenziswa iithiyori ngeethiyori ezingobuni, kuquka nethiyori kaCollier (1997) apho abona ubuni njengolunamacala amabini; avowal kunye ne-ascription. Ubuni bamaXhosa aseZimbabwe buxoxwe ngokwayama kwi-avowal njengokuba uCollier (Ibid.) eyicacisa. Kwizindululo eziqulathwe kolu phando, kuboniswa ukuba ikho imfuneko yokuba iintsapho zaseZimbabwe zidityaniswe nezizalwane zazo eziseMzantsi Afrika. Ukufundiswa kwesiXhosa kwaneenzame zokusebenzisa isiXhosa njengolwimi lokufunda nokufundisa kwizikolo zamaXhosa ezikumabanga aphantsi kuyafuneka nako ukuba kuphandwe nzulu. , There are an estimated two hundred thousand South African amaXhosa who are mostly amaMfengu descendants living in Zimbabwe since the late 1800s-1900s. The majority are found in the areas of Mbembesi, Fort Rixon in Filabusi, Kenilworth and the Motapa area in Bubi. It is stated that some of the amaXhosa living in Zimbabwe came from the Eastern Cape with Cecil John Rhodes as domestic workers and on wagons during the 1800s. Therefore, this thesis provides new knowledge about amaXhosa living in Zimbabwe and gives an analysis of the sociolinguistic and historical background of the amaXhosa living in Zimbabwe while showing how a cross-border language can survive against all odds. The subject of culture has been dealt with as there is a reciprocal relationship between language and culture. Ethnography and Oral History have been used as methods for this research. The findings reveal that land, culture, songs, religion, South African Xhosa literature classic books, technology and social media, as well as the 2013 Zimbabwean constitution, are tools that have played a role in the survival and maintenance of isiXhosa in Zimbabwe. It also assesses Language Policy issues as isiXhosa is now an officially recognized language in Zimbabwe. Drawing on various theories on identity, including Collier’s (1997) understanding that identity is divided into avowal and ascription, the identity of the amaXhosa of Zimbabwe has been discussed in this thesis with an emphasis on avowal as discussed by Collier (Ibid.). Among other recommendations, this study further recommends that a research that looks at the reunion of the Zimbabwean amaXhosa with their South African relatives needs to be undertaken. It also recommends that the teaching of isiXhosa as well as attempts to make isiXhosa the Language of Learning and Teaching (LoLT) in the amaXhosa primary schools and pre-schools also needs to be researched further.
- Full Text:
- Date Issued: 2017
- Authors: Kunju, Hleze Welsh
- Date: 2017
- Subjects: Language policy Zimbabwe , Xhosa (African people) Zimbabwe , Xhosa (African people) Social life and customs Zimbabwe , Xhosa language Zimbabwe , Language spread , Culture diffusion
- Language: Xhosa
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7370 , vital:21250
- Description: Kuqikelelwa ukuba kukho amaXhosa (amaMfengu) angcambu zawo ziseMzantsi Afrika amalunga namakhulu amabini amawaka azinze eZimbabwe ukususela kwiminyaka yoo-18001900. Uninzi lwawo lufumaneka eMbembesi, eFort Rixon, eFilabusi, eKenilworth naseMotapa eBubi. Imbali ithi, inxalenye yala maXhosa ngawaseMpuma Kapa, afudukela eZimbabwe noCecil John Rhodes eqhuba iinqwelo kananjalo esebenzela uRhodes ngeminyaka yoo-1800. Le thisisi yongeza kulwazi olutsha malunga nala maXhosa aseZimbabwe, iphonononga ubume bolwimi, imbali nemvelaphi yala maXhosa azinze eZimbabwe lo gama ibonisa ukuba naphantsi kwayiphi na imeko, ulwimi luyakwazi ukuphila ngaphaya kwemida. Ulwimi nenkcubeko zingumtya nethunga, ngenxa yoko le thisisi yayame kakhulu kwinkcubeko. Iethinografi nembali yomlomo zisetyenziswe njengendlela okanye imethodi yokuqhuba olu phando. Iziphumo zolu phando zibonisa ukuba umhlaba, inkcubeko, iingoma, inkolo yobuKrestu, iincwadi ezingaphelelwa xesha zoncwadi lwesiXhosa, iteknoloji namakhasi onxibelelwano nomgaqo-siseko waseZimbabwe (2013) zibe zizixhobo ezidlale indima ebonakalayo ekulondolozeni nasekuphuhliseni isiXhosa eZimbabwe. Imiba ephathelele kumgaqo-nkqubo wesiXhosa eZimbabwe nayo iyaphononongwa, njengokuba isiXhosa ilulwimi oluthathwa njengolusesikweni eZimbabwe.Kusetyenziswa iithiyori ngeethiyori ezingobuni, kuquka nethiyori kaCollier (1997) apho abona ubuni njengolunamacala amabini; avowal kunye ne-ascription. Ubuni bamaXhosa aseZimbabwe buxoxwe ngokwayama kwi-avowal njengokuba uCollier (Ibid.) eyicacisa. Kwizindululo eziqulathwe kolu phando, kuboniswa ukuba ikho imfuneko yokuba iintsapho zaseZimbabwe zidityaniswe nezizalwane zazo eziseMzantsi Afrika. Ukufundiswa kwesiXhosa kwaneenzame zokusebenzisa isiXhosa njengolwimi lokufunda nokufundisa kwizikolo zamaXhosa ezikumabanga aphantsi kuyafuneka nako ukuba kuphandwe nzulu. , There are an estimated two hundred thousand South African amaXhosa who are mostly amaMfengu descendants living in Zimbabwe since the late 1800s-1900s. The majority are found in the areas of Mbembesi, Fort Rixon in Filabusi, Kenilworth and the Motapa area in Bubi. It is stated that some of the amaXhosa living in Zimbabwe came from the Eastern Cape with Cecil John Rhodes as domestic workers and on wagons during the 1800s. Therefore, this thesis provides new knowledge about amaXhosa living in Zimbabwe and gives an analysis of the sociolinguistic and historical background of the amaXhosa living in Zimbabwe while showing how a cross-border language can survive against all odds. The subject of culture has been dealt with as there is a reciprocal relationship between language and culture. Ethnography and Oral History have been used as methods for this research. The findings reveal that land, culture, songs, religion, South African Xhosa literature classic books, technology and social media, as well as the 2013 Zimbabwean constitution, are tools that have played a role in the survival and maintenance of isiXhosa in Zimbabwe. It also assesses Language Policy issues as isiXhosa is now an officially recognized language in Zimbabwe. Drawing on various theories on identity, including Collier’s (1997) understanding that identity is divided into avowal and ascription, the identity of the amaXhosa of Zimbabwe has been discussed in this thesis with an emphasis on avowal as discussed by Collier (Ibid.). Among other recommendations, this study further recommends that a research that looks at the reunion of the Zimbabwean amaXhosa with their South African relatives needs to be undertaken. It also recommends that the teaching of isiXhosa as well as attempts to make isiXhosa the Language of Learning and Teaching (LoLT) in the amaXhosa primary schools and pre-schools also needs to be researched further.
- Full Text:
- Date Issued: 2017
Learners' experiences of school violence in Sarah Baartman District Municipality, Eastern Cape
- Authors: Hendricks, Eleanor Alvira
- Date: 2017
- Subjects: School violence -- South Africa -- Eastern Cape Violence in children -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/7841 , vital:30769
- Description: School-based violence amongst students in South Africa is a growing concern. Such violence is a great concern to all stakeholders involved in the school system. The more violence escalates; the more students are less likely to concentrate on their academic activities which then reduces their chances of success. There are weekly report broadcasts on the media on the death of students across the globe due school-based violence. School-based violence needs to be curbed and schools should be a safe environment where learning and teaching takes place not a battlefield where students live in fear of being the next victim. The aim of this study was to examine students’ experiences of school violence in Sarah Baartman District Municipality, Eastern Cape Province, South Africa. A qualitative approach and an exploratory research design were used in conducting this study as these approached allowed participants to share first hand experiences regarding the issue under investigation. A purposive sample was employed to select participants for the study. This technique allowed the researcher to select participants who displayed most of the characteristics of the larger population and who had sufficient knowledge on the issue under investigation. Forty participants were selected for the study as follows: 25 learners; 5 social Workers; 5 educators; and 5 members of the Representative Council of Learners from schools mostly affected by school-based violence. Data was obtained through semi-structured interviews; focus group discussions with students, social workers and educators; and observations. Data was analysed thematically and supported by the relevant literature. The findings revealed that there are high levels of school-based violence in Sarah Baartman District Municipality, however, the whole-school approach as a measure of combatting school violence, has proved to work in some parts of the Eastern Cape, the Western Cape and Kwazulu Natal provinces. Also, retributive forms of punishment show more positive results against corrective /corporal punishment. It is, therefore, recommended that the state should employ school and place social workers in schools in order to assist in addressing social issues within the school system. Stamping out inequalities among students will ultimately decrease school violence.
- Full Text:
- Date Issued: 2017
- Authors: Hendricks, Eleanor Alvira
- Date: 2017
- Subjects: School violence -- South Africa -- Eastern Cape Violence in children -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/7841 , vital:30769
- Description: School-based violence amongst students in South Africa is a growing concern. Such violence is a great concern to all stakeholders involved in the school system. The more violence escalates; the more students are less likely to concentrate on their academic activities which then reduces their chances of success. There are weekly report broadcasts on the media on the death of students across the globe due school-based violence. School-based violence needs to be curbed and schools should be a safe environment where learning and teaching takes place not a battlefield where students live in fear of being the next victim. The aim of this study was to examine students’ experiences of school violence in Sarah Baartman District Municipality, Eastern Cape Province, South Africa. A qualitative approach and an exploratory research design were used in conducting this study as these approached allowed participants to share first hand experiences regarding the issue under investigation. A purposive sample was employed to select participants for the study. This technique allowed the researcher to select participants who displayed most of the characteristics of the larger population and who had sufficient knowledge on the issue under investigation. Forty participants were selected for the study as follows: 25 learners; 5 social Workers; 5 educators; and 5 members of the Representative Council of Learners from schools mostly affected by school-based violence. Data was obtained through semi-structured interviews; focus group discussions with students, social workers and educators; and observations. Data was analysed thematically and supported by the relevant literature. The findings revealed that there are high levels of school-based violence in Sarah Baartman District Municipality, however, the whole-school approach as a measure of combatting school violence, has proved to work in some parts of the Eastern Cape, the Western Cape and Kwazulu Natal provinces. Also, retributive forms of punishment show more positive results against corrective /corporal punishment. It is, therefore, recommended that the state should employ school and place social workers in schools in order to assist in addressing social issues within the school system. Stamping out inequalities among students will ultimately decrease school violence.
- Full Text:
- Date Issued: 2017
Legislative prescriptions affecting persons with disabilities: a comparison of selected commonwealth countries
- Authors: Pillay, Sareesha
- Date: 2017
- Subjects: People with disabilities People with disabilities -- Government policy , Commonwealth countries -- Government policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/14510 , vital:27670
- Description: Among the diverse citizenry that comprise Commonwealth countries are persons affected by disabilities and who remain vulnerable and under-represented. In light of the challenges of under-representation and the stigmatisation of persons with disabilities globally, the democratic principles of the Commonwealth of Nations have been placed under scrutiny. Thus the constitutionality and fairness of governmental policies and national legislation are criticised for their degree of reflection and representation of the social and political rights of persons with disabilities. This thesis will critically analyse the national legislative and policy frameworks affecting persons with disabilities in selected Commonwealth countries. Comparisons will be made between these selected countries, namely Canada, India, Kenya and South Africa. The Commonwealth and subscription to the United Nations’ Convention on the Rights of Persons with Disabilities will serve as a standardised platform for comparisons. Comparisons of the legislative prescriptions of the respective countries will be instrumental highlighting the challenges in the representation of the rights and freedoms of persons with disabilities globally and in improving and strengthening legislative prescription affecting persons with disabilities. The varying levels of development amongst countries and the lack of appropriate infrastructure continue to be detrimental to the effective representation of persons with disabilities and the ability of national governments to develop strong and effective legislative and policy frameworks remains compromised. It is thus essential that attention is directed to the challenges facing countries so that appropriate actions and remediation can improve the vulnerabilities linked to persons with disabilities. This study adopts a theoretical and case law approach. It firstly provides a conceptual framework for disability. The conceptual framework comprises the perspectives on disability that have justified the approaches to persons with disabilities. Theories and values and the international legal framework relevant to persons with disabilities will be provided. The theories and values provide a traditional framework and play an instrumental role in guiding actions toward the effective development of public policy and prescription of legislation. The selected countries will be analysed as separate cases. The countries will be analysed individually prior to the comparative component to acknowledge the strengths, weaknesses and challenges facing each country in relation to its own structure and level of development. The findings are based on themes which emerge from the analysis of the legislation and policies affecting persons with disabilities in the selected countries. The findings are presented in a comparative format owing to the comparative nature of the study. Recommendations that flow from the comparative analysis and findings are proposed in the final chapter. The adoption of the proposed recommendations can strengthen legislative prescriptions affecting persons with disabilities both nationally and internationally and improve the representation of the rights and freedom of persons with disabilities in the global context.
- Full Text:
- Date Issued: 2017
- Authors: Pillay, Sareesha
- Date: 2017
- Subjects: People with disabilities People with disabilities -- Government policy , Commonwealth countries -- Government policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/14510 , vital:27670
- Description: Among the diverse citizenry that comprise Commonwealth countries are persons affected by disabilities and who remain vulnerable and under-represented. In light of the challenges of under-representation and the stigmatisation of persons with disabilities globally, the democratic principles of the Commonwealth of Nations have been placed under scrutiny. Thus the constitutionality and fairness of governmental policies and national legislation are criticised for their degree of reflection and representation of the social and political rights of persons with disabilities. This thesis will critically analyse the national legislative and policy frameworks affecting persons with disabilities in selected Commonwealth countries. Comparisons will be made between these selected countries, namely Canada, India, Kenya and South Africa. The Commonwealth and subscription to the United Nations’ Convention on the Rights of Persons with Disabilities will serve as a standardised platform for comparisons. Comparisons of the legislative prescriptions of the respective countries will be instrumental highlighting the challenges in the representation of the rights and freedoms of persons with disabilities globally and in improving and strengthening legislative prescription affecting persons with disabilities. The varying levels of development amongst countries and the lack of appropriate infrastructure continue to be detrimental to the effective representation of persons with disabilities and the ability of national governments to develop strong and effective legislative and policy frameworks remains compromised. It is thus essential that attention is directed to the challenges facing countries so that appropriate actions and remediation can improve the vulnerabilities linked to persons with disabilities. This study adopts a theoretical and case law approach. It firstly provides a conceptual framework for disability. The conceptual framework comprises the perspectives on disability that have justified the approaches to persons with disabilities. Theories and values and the international legal framework relevant to persons with disabilities will be provided. The theories and values provide a traditional framework and play an instrumental role in guiding actions toward the effective development of public policy and prescription of legislation. The selected countries will be analysed as separate cases. The countries will be analysed individually prior to the comparative component to acknowledge the strengths, weaknesses and challenges facing each country in relation to its own structure and level of development. The findings are based on themes which emerge from the analysis of the legislation and policies affecting persons with disabilities in the selected countries. The findings are presented in a comparative format owing to the comparative nature of the study. Recommendations that flow from the comparative analysis and findings are proposed in the final chapter. The adoption of the proposed recommendations can strengthen legislative prescriptions affecting persons with disabilities both nationally and internationally and improve the representation of the rights and freedom of persons with disabilities in the global context.
- Full Text:
- Date Issued: 2017
Litter quality effects on soil stabiltiy and erodibility in the Ntabelanga Area, Eastern Cape, South Africa
- Authors: Parwada, Cosmas
- Date: 2017
- Subjects: Soil erosion Soil management -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/4824 , vital:28531
- Description: Soil organic matter (SOM) plays a primary role in aggregation and stabilization of soils, hence reducing their susceptibility to erosion. In South Africa (SA), most soils have low (< 4 percent) soil organic matte (SOM) contents, making them susceptible to soil erosion. Little is known about SOM quality effects in soil stabilization in the SA context, it is therefore difficult to advocate specific organic matter sources in order to stabilize a particular soil. This study evaluated effects of different litter quality sources (Vachellia karoo (sweet thorn) leaf litter and Zea mays (maize) stover) on soil aggregate stabilization at a soil micro-level (soil aggregate), guided by the following specific objectives; (i) to characterize soil properties that influence the erodibility of soils in the Ntabelanga area, Eastern Cape (EC) Province, SA (ii) to assess fractionation of organic carbon during decomposition of different litter sources (iii) to determine rate of soil macroaggregate re-formation under different litter amendments (iv) to determine the influence of different litter quality on splash soil erosion and (v) to delineate the Ntabelanga area into different soil erosion sensitivity zones. Soil samples collected from a proposed Ntabelanga dam site, EC Province, SA, were characterized for factors influencing erodibility. Soil physical and chemical properties were analyzed, soil erodibility (K-factor) estimated using SOC content and surface properties and soil loss rates by splashing determined under rainfall simulations at 360 mm h-1 rainfall intensity. Soil loss was then correlated with the chemical and physical soil properties. SOC showed significant (P< 0.05) inverse relationship with soil loss. Soils samples were bulked to seven composite samples according to major soil horizons (orthic A, melanic A, pedocutanic B, red apedal B, saprolite, G horizon and prismacutanic B) in the areas of soil associations, macroaggregate (> 0.250 mm) were removed by passing through a 0.250 mm sieve. The remaining soil microaggregates (< 0.250 mm) were then mixed with high quality Vachellia karoo leaf litter (C/N = 23.8) and low quality Zea mays stover (C/N = 37.4) and incubated at 23oC for 30 weeks. Jars were arranged as a 7 × 3 factorial laid in completely randomized design (CRD) with three replicates. Data was repeatedly measured at 1, 3, 8, 14, 23 and 30 weeks after incubation: to determine the stabilization of SOM by fractionating the soil particulate organic matter (POM), rate of soil macroaggregate re-formation and influence of litter quality on splash soil erosion along a decomposition continuum. Free light fractions (Free LF), coarse particulate organic matter (CoPOM) and fine particulate organic matter (FiPOM) within macroaggregates (> 250 μm) decreased exponentially from week 1 to 30 and were significantly (p < 0.05) influenced by litter quality × soil horizon × time interactions. A similar trend for FiPOM fractions in macroaggregates was observed in the 53-250 μm microaggregates (p < 0.05). The greatest influence on changes in POM fractions occurred within the first 3 weeks of incorporation. Both V. karroo leaf litter and Z. mays stover significantly stabilized the macroaggregates within the first 3 weeks after incubation. Cumulative macroaggregates yields, mean weight diameter (MWD), percentage water stable aggregates (%WSA) and whole soil stability index (WSSI) in litter amended soils increased up to week 8 of incubation and thereafter gradually declined in all soils. An increase in macroaggregation resulted in increased MWD, WSSI values and large and small aggregates distribution. Aggregation was significantly higher in soils with higher clay content than sand content, suggesting that soil texture was highly influential in litter decomposition. Rate of litter decomposition was influenced by soil type × time interactions which determined extent and macroaggregation dynamics along a decomposition continuum. The amount of splashed sediments was determined from each soil horizon at 360 mm h-1 simulated rainfall intensity applied as either single 8minute rainstorm (SR) or 4 × 2minute intermittent rainstorms (IR) separated by a 72 h drying period. Results showed a reduction in splashed sediments under IR and SR storms in litter-amended soils during the first 8 weeks of incubation with gradual increase thereafter. More sediments were splashed under IR than SR and litter quality had no influence on splashed sediments per soil horizon. Soil horizons profile with more clay than sand particles enhanced the litter effects on the soil resistance against detachment. The amount of SOC loss was influenced by primary particle size distribution and initial SOC content of the soil. Rainfall pattern and the initial SOC content were the main factors by which different soils influenced SOC loss. More rainstorm patterns should be investigated on these soils.
- Full Text:
- Date Issued: 2017
- Authors: Parwada, Cosmas
- Date: 2017
- Subjects: Soil erosion Soil management -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/4824 , vital:28531
- Description: Soil organic matter (SOM) plays a primary role in aggregation and stabilization of soils, hence reducing their susceptibility to erosion. In South Africa (SA), most soils have low (< 4 percent) soil organic matte (SOM) contents, making them susceptible to soil erosion. Little is known about SOM quality effects in soil stabilization in the SA context, it is therefore difficult to advocate specific organic matter sources in order to stabilize a particular soil. This study evaluated effects of different litter quality sources (Vachellia karoo (sweet thorn) leaf litter and Zea mays (maize) stover) on soil aggregate stabilization at a soil micro-level (soil aggregate), guided by the following specific objectives; (i) to characterize soil properties that influence the erodibility of soils in the Ntabelanga area, Eastern Cape (EC) Province, SA (ii) to assess fractionation of organic carbon during decomposition of different litter sources (iii) to determine rate of soil macroaggregate re-formation under different litter amendments (iv) to determine the influence of different litter quality on splash soil erosion and (v) to delineate the Ntabelanga area into different soil erosion sensitivity zones. Soil samples collected from a proposed Ntabelanga dam site, EC Province, SA, were characterized for factors influencing erodibility. Soil physical and chemical properties were analyzed, soil erodibility (K-factor) estimated using SOC content and surface properties and soil loss rates by splashing determined under rainfall simulations at 360 mm h-1 rainfall intensity. Soil loss was then correlated with the chemical and physical soil properties. SOC showed significant (P< 0.05) inverse relationship with soil loss. Soils samples were bulked to seven composite samples according to major soil horizons (orthic A, melanic A, pedocutanic B, red apedal B, saprolite, G horizon and prismacutanic B) in the areas of soil associations, macroaggregate (> 0.250 mm) were removed by passing through a 0.250 mm sieve. The remaining soil microaggregates (< 0.250 mm) were then mixed with high quality Vachellia karoo leaf litter (C/N = 23.8) and low quality Zea mays stover (C/N = 37.4) and incubated at 23oC for 30 weeks. Jars were arranged as a 7 × 3 factorial laid in completely randomized design (CRD) with three replicates. Data was repeatedly measured at 1, 3, 8, 14, 23 and 30 weeks after incubation: to determine the stabilization of SOM by fractionating the soil particulate organic matter (POM), rate of soil macroaggregate re-formation and influence of litter quality on splash soil erosion along a decomposition continuum. Free light fractions (Free LF), coarse particulate organic matter (CoPOM) and fine particulate organic matter (FiPOM) within macroaggregates (> 250 μm) decreased exponentially from week 1 to 30 and were significantly (p < 0.05) influenced by litter quality × soil horizon × time interactions. A similar trend for FiPOM fractions in macroaggregates was observed in the 53-250 μm microaggregates (p < 0.05). The greatest influence on changes in POM fractions occurred within the first 3 weeks of incorporation. Both V. karroo leaf litter and Z. mays stover significantly stabilized the macroaggregates within the first 3 weeks after incubation. Cumulative macroaggregates yields, mean weight diameter (MWD), percentage water stable aggregates (%WSA) and whole soil stability index (WSSI) in litter amended soils increased up to week 8 of incubation and thereafter gradually declined in all soils. An increase in macroaggregation resulted in increased MWD, WSSI values and large and small aggregates distribution. Aggregation was significantly higher in soils with higher clay content than sand content, suggesting that soil texture was highly influential in litter decomposition. Rate of litter decomposition was influenced by soil type × time interactions which determined extent and macroaggregation dynamics along a decomposition continuum. The amount of splashed sediments was determined from each soil horizon at 360 mm h-1 simulated rainfall intensity applied as either single 8minute rainstorm (SR) or 4 × 2minute intermittent rainstorms (IR) separated by a 72 h drying period. Results showed a reduction in splashed sediments under IR and SR storms in litter-amended soils during the first 8 weeks of incubation with gradual increase thereafter. More sediments were splashed under IR than SR and litter quality had no influence on splashed sediments per soil horizon. Soil horizons profile with more clay than sand particles enhanced the litter effects on the soil resistance against detachment. The amount of SOC loss was influenced by primary particle size distribution and initial SOC content of the soil. Rainfall pattern and the initial SOC content were the main factors by which different soils influenced SOC loss. More rainstorm patterns should be investigated on these soils.
- Full Text:
- Date Issued: 2017