A critical analysis of Professor Andrew Tracey’s contribution to African music pedagogy and the field of applied ethnomusicology
- Authors: Moyo, Vuyelwa O'Lacy
- Date: 2022-10-14
- Subjects: Tracey, Andrew T N , Ethnomusicology , Music Instruction and study Africa , Mbira Zimbabwe
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406829 , vital:70311
- Description: The research presented in this thesis is based on my interest and experience in forms of African music, ethnomusicology, and studying mbira with Professor Emeritus Andrew Tracey. When I arrived in South Africa in 2019 to join Rhodes University’s Applied Ethnomusicology programme, I chose to study the mbira with Tracey as the idea of learning more about Zimbabwe through music was important to the formation of my identity. Through the lens of embodied learning and a practice-based approach in this research, I evaluate how Tracey’s numerous contributions to African music pedagogy have improved prospects for African music scholars and students in terms of contributing to the goals of applied ethnomusicology. The primary purpose of this thesis is to respond to the absence of serious scrutiny of existing pedagogical approaches to African music at universities across South Africa. The contribution this research makes will be valuable to African music programmes across the continent as well as to practitioners of African traditional instruments, such as the marimba, mbira, timbila xylophones, nyanga pan pipes, and valimba xylophones. The thesis comprises five chapters. The first presents an introduction to the research, and its goals, procedures and approaches, along with an outline of the subsequent chapters. Tracey’s biography is covered in the second chapter. A consideration of the state of African music teaching in other African countries such as Ghana, Kenya, and Zimbabwe; the history of African music; and the state of African music pedagogy in tertiary institutions in South Africa constitutes the third chapter. Chapter 4 comprises an analysis of Tracey’s articles and data gathered from interviews, as well as my personal reflections as Tracey’s student. The final chapter presents a summary of the preceding chapters, the study’s findings, and suggestions for further research. A multidisciplinary approach was used for this thesis. The results finds that Tracey’s articles had six common themes which he wrote about and are a contribution to African music pedagogy. These themes are the history of instruments, the structure of the instrument, the learning/playing technique, structure of the instrument, transcription and dance steps. , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Moyo, Vuyelwa O'Lacy
- Date: 2022-10-14
- Subjects: Tracey, Andrew T N , Ethnomusicology , Music Instruction and study Africa , Mbira Zimbabwe
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406829 , vital:70311
- Description: The research presented in this thesis is based on my interest and experience in forms of African music, ethnomusicology, and studying mbira with Professor Emeritus Andrew Tracey. When I arrived in South Africa in 2019 to join Rhodes University’s Applied Ethnomusicology programme, I chose to study the mbira with Tracey as the idea of learning more about Zimbabwe through music was important to the formation of my identity. Through the lens of embodied learning and a practice-based approach in this research, I evaluate how Tracey’s numerous contributions to African music pedagogy have improved prospects for African music scholars and students in terms of contributing to the goals of applied ethnomusicology. The primary purpose of this thesis is to respond to the absence of serious scrutiny of existing pedagogical approaches to African music at universities across South Africa. The contribution this research makes will be valuable to African music programmes across the continent as well as to practitioners of African traditional instruments, such as the marimba, mbira, timbila xylophones, nyanga pan pipes, and valimba xylophones. The thesis comprises five chapters. The first presents an introduction to the research, and its goals, procedures and approaches, along with an outline of the subsequent chapters. Tracey’s biography is covered in the second chapter. A consideration of the state of African music teaching in other African countries such as Ghana, Kenya, and Zimbabwe; the history of African music; and the state of African music pedagogy in tertiary institutions in South Africa constitutes the third chapter. Chapter 4 comprises an analysis of Tracey’s articles and data gathered from interviews, as well as my personal reflections as Tracey’s student. The final chapter presents a summary of the preceding chapters, the study’s findings, and suggestions for further research. A multidisciplinary approach was used for this thesis. The results finds that Tracey’s articles had six common themes which he wrote about and are a contribution to African music pedagogy. These themes are the history of instruments, the structure of the instrument, the learning/playing technique, structure of the instrument, transcription and dance steps. , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2022
- Full Text:
- Date Issued: 2022-10-14
The 2019 SASBO Bank Workers’ Strike in South Africa: unpacking labour responses to the Fourth Industrial Revolution
- Authors: Moyo, Wisdom Ntandoyenkosi
- Date: 2022-10-14
- Subjects: Industry 4.0 , Fourth Industrial Revolution , Banks and banking South Africa , SASBO , Labor unions South Africa , Strikes and lockouts Bank employees South Africa , Working class South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406774 , vital:70306
- Description: The Fourth Industrial Revolution (4IR) is a global phenomenon, affecting workers and trade unions worldwide with the increased automation, including digitisation, of work. Although the 4IR has often been presented as an impersonal technological force that society must just accept, it is in fact rooted in the evolution of capitalist society: it is the latest in a series of industrial revolutions and restructurings of the labour process. These are systemic occurrences, based in class struggles around the extension of management control of every part of work, and replacing workers with machinery; it must then be seen in the context of a history of Taylorism, Fordism and neo-Fordism, and their local expressions, such as racial Fordism in South Africa. The roll-out and the socio-economic effects of the 4IR are therefore shaped by inequality and power, and look to be dire for the working-class in a South Africa that already has record unemployment rates. In the local banking sector, the 4IR has been associated with a wave of retrenchments and branch closures. Faced with this situation, the South African Society of Bank Officials (SASBO), the biggest and oldest union in the finance sector, then with around 73 000 members, tried to hold a mass strike in late 2019. Blocked by the Labour Court, this would have been the union’s biggest strike in a century. It followed from a longer campaign by SASBO to halt job losses, ensure redeployment and reskilling for affected bank workers, and win an agreement for these aims with the banks. The union undertook research on the 4IR and sought to win support from banks, as well as government departments and other unions, for an alternative, worker-friendly roll-out of the 4IR. The decision to strike took place after extensive engagements with banks and stakeholders like government failed, the banks proceeding with retrenchments: the union faced an unprecedented challenge and was on the defensive. This dissertation maps SASBO’s campaign around the 4IR, using the Power Resources Approach (PRA), and assesses its approach. It also tries to show how an analysis of a moderate, older white-collar union like SASBO enriches South African labour studies. A qualitative methodology was used in this research to understand the issue at hand, using documents and semi-structured interviews with SASBO National Executive Committee members. The key findings are that the 4IR will not spare white-collar jobs and presents an unprecedented challenge to unions. There is an urgent need for union revitalisation, including new ways to organise effective responses to technological change. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Moyo, Wisdom Ntandoyenkosi
- Date: 2022-10-14
- Subjects: Industry 4.0 , Fourth Industrial Revolution , Banks and banking South Africa , SASBO , Labor unions South Africa , Strikes and lockouts Bank employees South Africa , Working class South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406774 , vital:70306
- Description: The Fourth Industrial Revolution (4IR) is a global phenomenon, affecting workers and trade unions worldwide with the increased automation, including digitisation, of work. Although the 4IR has often been presented as an impersonal technological force that society must just accept, it is in fact rooted in the evolution of capitalist society: it is the latest in a series of industrial revolutions and restructurings of the labour process. These are systemic occurrences, based in class struggles around the extension of management control of every part of work, and replacing workers with machinery; it must then be seen in the context of a history of Taylorism, Fordism and neo-Fordism, and their local expressions, such as racial Fordism in South Africa. The roll-out and the socio-economic effects of the 4IR are therefore shaped by inequality and power, and look to be dire for the working-class in a South Africa that already has record unemployment rates. In the local banking sector, the 4IR has been associated with a wave of retrenchments and branch closures. Faced with this situation, the South African Society of Bank Officials (SASBO), the biggest and oldest union in the finance sector, then with around 73 000 members, tried to hold a mass strike in late 2019. Blocked by the Labour Court, this would have been the union’s biggest strike in a century. It followed from a longer campaign by SASBO to halt job losses, ensure redeployment and reskilling for affected bank workers, and win an agreement for these aims with the banks. The union undertook research on the 4IR and sought to win support from banks, as well as government departments and other unions, for an alternative, worker-friendly roll-out of the 4IR. The decision to strike took place after extensive engagements with banks and stakeholders like government failed, the banks proceeding with retrenchments: the union faced an unprecedented challenge and was on the defensive. This dissertation maps SASBO’s campaign around the 4IR, using the Power Resources Approach (PRA), and assesses its approach. It also tries to show how an analysis of a moderate, older white-collar union like SASBO enriches South African labour studies. A qualitative methodology was used in this research to understand the issue at hand, using documents and semi-structured interviews with SASBO National Executive Committee members. The key findings are that the 4IR will not spare white-collar jobs and presents an unprecedented challenge to unions. There is an urgent need for union revitalisation, including new ways to organise effective responses to technological change. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
The biology of Oreochromis mossambicus and vulnerability to the invasion of Oreochromis niloticus
- Authors: Mpanza, Nobuhle Phumzile
- Date: 2022-10-14
- Subjects: Ecomorphology , Mozambique tilapia , Nile tilapia , Introduced fishes , Predatory aquatic animals , Predation (Biology) , Otoliths , Von Bertalanffy function
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/362983 , vital:65380
- Description: Mozambique tilapia, Oreochromis mossambicus, a native southern African species now co-occurs with invasive Nile tilapia, Oreochromis niloticus throughout much of the distribution of the former. The spread of O. niloticus in South Africa has been attributed to escapees from aquaculture facilities, placing O. mossambicus at risk through competition for habitat and food resources, as well as through hybridisation. To better manage invasions, a comprehensive understanding of the biology, ecology and behaviour of both native and invasive species is required. The aim of this research was to comparatively assess the biology of O. mossambicus and O. niloticus, their food resource use characteristics and potential competitive interactions to infer impact risks associated with O. niloticus invasion dynamics. In addition to lack of sufficient autecological knowledge on O. niloticus in general, the challenge in the Eastern Cape is that relatively little regional knowledge is available on the biology and ecology of the native O. mossambicus. To address this, a total of 101 O. mossambicus individuals (32 - 297 mm LT) were sampled from the Sunday River catchment and their age and growth determined using sectioned sagittal otoliths. The largest female was 288.8 mm with a parameter estimate of LT (mm) = 272 (1-e-0.331(t=0.772)) and the largest male was 297 mm described as LT (mm) = 331.9 (1-e-0.167(t=1.192)). The growth parameter estimate age for combined sexes was best described as LT (mm) = 322.5 (1-e-0.201(t=1.027)). The growth rate was initially rapid for O. mossambicus and the asymptotic length reached after four years. The length-at-50% maturity was reached at 106.45 mm LT (R2 = 0.57) for the entire population. There was a significant difference (ᵡ2 = 8,047, df = 1, p-value = 0.0045) in the sex ratio between males and females which was skewed towards males 1:1.89 (F:M). Comparisons with O. niloticus were based on literature and these showed that O. niloticus had faster growth rates than O. mossambicus. These results serve as a baseline study in predicting the potential impacts of O. niloticus if it was to be introduced in the Eastern Cape region. Furthermore, although these two species are known to share habitat and food resources, feeding dynamics within the context of relative impact on prey resources, and competition potential between the species, are largely lacking. I used experimental functional response procedures to contrast the food consumption dynamics of each species and to assess for any multiple predator effects (MPEs) between these two closely related fishes. This was done by contrasting functional responses between individual species under single predator scenarios, predicted multiple predator functional response dynamics based on the individual species outputs, and actually observed functional responses under multiple predator conditions. Results showed that both Nile tilapia and Mozambique tilapia depicted a destabilizing Type II functional response. In both single and conspecific pairing Nile tilapia had significantly greater functional responses than Mozambique tilapia, hence greater overall predatory potential than its native congeneric Mozambique tilapia. Attack rates were also greater for Nile tilapia than Mozambique tilapia with both species showing similar handling times in single trials. However, no evidence for MPEs were detected, given lack of differences between predicted and observed functional responses under heterospecific conditions. These results suggest that Nile tilapia do not adjust their food intake in the presence of heterospecific competitors, but do consume more than Mozambique tilapia and are better at finding food when it is present at low densities. Feeding-related morphological characteristics may influence predatory performance of a species and can further provide information on the species’ capacity to locate, attack and consume different prey items. The feeding capacities between O. mossambicus and O. niloticus were compared based on morphological traits in order to determine whether differences existed, and if these differences place the invasive O. niloticus at an advantageous position in terms of resource acquisition and consumption over its native congener. Principal component analysis for functional morphology traits showed overlap between O. niloticus and O. mossambicus. Oreochromis niloticus had distinctively larger lower jaw closing force, gill resistance and gill raker length which facilitated greater feeding capacities for the invasive species over the native O. mossambicus. Trophic profiles depicted high dietary overlap between the two species. Although O. niloticus had a greater feeding capacity towards phytoplankton, plants, fish (ambush), fish (pursuit) and larvae, while O. mossambicus only showed greater feeding capacity towards zooplankton. While dietary overlap and similarities in morphological traits between native and invasive species may result in exploitative competition between the species, O. niloticus seems to be more versatile in its feeding and capable of consuming food web components that O. mossambicus may not be able to handle. , Thesis (MSc) -- Faculty of Science, Zoology and Entomology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mpanza, Nobuhle Phumzile
- Date: 2022-10-14
- Subjects: Ecomorphology , Mozambique tilapia , Nile tilapia , Introduced fishes , Predatory aquatic animals , Predation (Biology) , Otoliths , Von Bertalanffy function
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/362983 , vital:65380
- Description: Mozambique tilapia, Oreochromis mossambicus, a native southern African species now co-occurs with invasive Nile tilapia, Oreochromis niloticus throughout much of the distribution of the former. The spread of O. niloticus in South Africa has been attributed to escapees from aquaculture facilities, placing O. mossambicus at risk through competition for habitat and food resources, as well as through hybridisation. To better manage invasions, a comprehensive understanding of the biology, ecology and behaviour of both native and invasive species is required. The aim of this research was to comparatively assess the biology of O. mossambicus and O. niloticus, their food resource use characteristics and potential competitive interactions to infer impact risks associated with O. niloticus invasion dynamics. In addition to lack of sufficient autecological knowledge on O. niloticus in general, the challenge in the Eastern Cape is that relatively little regional knowledge is available on the biology and ecology of the native O. mossambicus. To address this, a total of 101 O. mossambicus individuals (32 - 297 mm LT) were sampled from the Sunday River catchment and their age and growth determined using sectioned sagittal otoliths. The largest female was 288.8 mm with a parameter estimate of LT (mm) = 272 (1-e-0.331(t=0.772)) and the largest male was 297 mm described as LT (mm) = 331.9 (1-e-0.167(t=1.192)). The growth parameter estimate age for combined sexes was best described as LT (mm) = 322.5 (1-e-0.201(t=1.027)). The growth rate was initially rapid for O. mossambicus and the asymptotic length reached after four years. The length-at-50% maturity was reached at 106.45 mm LT (R2 = 0.57) for the entire population. There was a significant difference (ᵡ2 = 8,047, df = 1, p-value = 0.0045) in the sex ratio between males and females which was skewed towards males 1:1.89 (F:M). Comparisons with O. niloticus were based on literature and these showed that O. niloticus had faster growth rates than O. mossambicus. These results serve as a baseline study in predicting the potential impacts of O. niloticus if it was to be introduced in the Eastern Cape region. Furthermore, although these two species are known to share habitat and food resources, feeding dynamics within the context of relative impact on prey resources, and competition potential between the species, are largely lacking. I used experimental functional response procedures to contrast the food consumption dynamics of each species and to assess for any multiple predator effects (MPEs) between these two closely related fishes. This was done by contrasting functional responses between individual species under single predator scenarios, predicted multiple predator functional response dynamics based on the individual species outputs, and actually observed functional responses under multiple predator conditions. Results showed that both Nile tilapia and Mozambique tilapia depicted a destabilizing Type II functional response. In both single and conspecific pairing Nile tilapia had significantly greater functional responses than Mozambique tilapia, hence greater overall predatory potential than its native congeneric Mozambique tilapia. Attack rates were also greater for Nile tilapia than Mozambique tilapia with both species showing similar handling times in single trials. However, no evidence for MPEs were detected, given lack of differences between predicted and observed functional responses under heterospecific conditions. These results suggest that Nile tilapia do not adjust their food intake in the presence of heterospecific competitors, but do consume more than Mozambique tilapia and are better at finding food when it is present at low densities. Feeding-related morphological characteristics may influence predatory performance of a species and can further provide information on the species’ capacity to locate, attack and consume different prey items. The feeding capacities between O. mossambicus and O. niloticus were compared based on morphological traits in order to determine whether differences existed, and if these differences place the invasive O. niloticus at an advantageous position in terms of resource acquisition and consumption over its native congener. Principal component analysis for functional morphology traits showed overlap between O. niloticus and O. mossambicus. Oreochromis niloticus had distinctively larger lower jaw closing force, gill resistance and gill raker length which facilitated greater feeding capacities for the invasive species over the native O. mossambicus. Trophic profiles depicted high dietary overlap between the two species. Although O. niloticus had a greater feeding capacity towards phytoplankton, plants, fish (ambush), fish (pursuit) and larvae, while O. mossambicus only showed greater feeding capacity towards zooplankton. While dietary overlap and similarities in morphological traits between native and invasive species may result in exploitative competition between the species, O. niloticus seems to be more versatile in its feeding and capable of consuming food web components that O. mossambicus may not be able to handle. , Thesis (MSc) -- Faculty of Science, Zoology and Entomology, 2022
- Full Text:
- Date Issued: 2022-10-14
Effect of Helicosporidium sp. (Chlorophyta; Trebouxiophyceae) infection on Cyrtobagous salviniae Calder and Sands (Coleoptera: Curculionidae), a biological control agent for the invasive Salvinia molesta D.S. Mitchell (Salviniaceae) in South
- Authors: Mphephu, Tshililo Emmanuel
- Date: 2022-10-14
- Subjects: Salvinia molesta South Africa , Weeds Biological control , Cyrtobagous salviniae , Ketoconazole
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365815 , vital:65792 , DOI https://doi.org/10.21504/10962/365815
- Description: The effectiveness of established biological control agents depends on biotic and abiotic interactions in the introduced range. The weevil, Cyrtobagous salviniae Calder and Sands (Coleoptera: Curculionidae), was released as a biological control against Salvinia molesta D.S. Mitchell (Salviniaceae) in South Africa in 1985. This agent has been highly successful against S. molesta and has significantly reduced the weed’s populations around the country. However, in 2007, the parasitic alga, Helicosporidium sp. (an undescribed species), was detected in field-collected C. salviniae adults in South Africa. The distribution and impacts of this disease on the weevil and its efficacy as a control agent were not known. In this thesis, the prevalence, infection load, and impact of Helicosporidium sp. on C. salviniae was determined. In 2019, adult weevils were collected from 10 sites across the Eastern Cape, KwaZulu-Natal, Limpopo, and Western Cape provinces and screened to determine the occurrence, infection load, and geographic distribution of Helicosporidium sp. Transmission mechanisms of this disease in C. salviniae were then evaluated. The possible impact of Helicosporidium sp. was assessed by comparing the feeding rates and the reproductive output of the diseased and healthy adults of C. salviniae. An attempt was then made to eliminate the disease in C. salviniae through the application of the antibiotic, ketoconazole. Further, the role of temperature on infection load in C. salviniae was also assessed. Finally, recommendations for the long-term biological control programme against S. molesta in South Africa were made. The disease covers the entire distribution range of C. salviniae in South Africa, with the disease occurrence rate ranging from 92.15% to 100% insects infected per site. Helicosporidium sp. was found to transmit vertically within the populations of C. salviniae. Infection by the Helicosporidium sp. disease reduced the reproductive output of C. salviniae as well its impact on biomass reduction of S. molesta when a diseased culture was compared to a healthy culture from the USA. 98.44 to 98.55% of Helicosporidium sp. loads were reduced through multiple applications of ketoconazole concentrations under in vitro trials. In vivo treatments resulted in 70% control of Helicosporidium sp. in the adults of C. salviniae that were fed ketoconazole three times over a 21 day period. Adult C. salviniae feeding and survival performances were similar when fed fronds of S. molesta inoculated with ketoconazole and water. The lowest and highest disease loads of Helicosporidium sp. were recorded when the weevils were reared at 30°C and 14°C, respectively. As expected, the highest impact and reproductive output of C. salviniae were at 30°C. The evaluations discussed in this thesis highlight the role of diseases in biological control agents, and gaps in both the pre-release and post-release monitoring that should integrate screening of diseases in these studies. Although the combined application of the antibiotic and temperature will reduce Helicosporidium sp. loads and impact, this technology is most likely only applicable where the weevils are reared in small numbers in a rearing facility and not really applicable to the field situation. It is important to release healthy agents that will cause efficient control of the target weed plant species, therefore, when introducing new biological control agents, the health status of such agents needs to be understood. Therefore, long-term field monitoring and assessment of the impact of C. salviniae on S. molesta should be conducted to track all the changes that may result due to the presence of Helicosporidium sp. This long-term monitoring and assessment will give a more informative role of Helicosporidium sp. in field populations of C. salviniae. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mphephu, Tshililo Emmanuel
- Date: 2022-10-14
- Subjects: Salvinia molesta South Africa , Weeds Biological control , Cyrtobagous salviniae , Ketoconazole
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365815 , vital:65792 , DOI https://doi.org/10.21504/10962/365815
- Description: The effectiveness of established biological control agents depends on biotic and abiotic interactions in the introduced range. The weevil, Cyrtobagous salviniae Calder and Sands (Coleoptera: Curculionidae), was released as a biological control against Salvinia molesta D.S. Mitchell (Salviniaceae) in South Africa in 1985. This agent has been highly successful against S. molesta and has significantly reduced the weed’s populations around the country. However, in 2007, the parasitic alga, Helicosporidium sp. (an undescribed species), was detected in field-collected C. salviniae adults in South Africa. The distribution and impacts of this disease on the weevil and its efficacy as a control agent were not known. In this thesis, the prevalence, infection load, and impact of Helicosporidium sp. on C. salviniae was determined. In 2019, adult weevils were collected from 10 sites across the Eastern Cape, KwaZulu-Natal, Limpopo, and Western Cape provinces and screened to determine the occurrence, infection load, and geographic distribution of Helicosporidium sp. Transmission mechanisms of this disease in C. salviniae were then evaluated. The possible impact of Helicosporidium sp. was assessed by comparing the feeding rates and the reproductive output of the diseased and healthy adults of C. salviniae. An attempt was then made to eliminate the disease in C. salviniae through the application of the antibiotic, ketoconazole. Further, the role of temperature on infection load in C. salviniae was also assessed. Finally, recommendations for the long-term biological control programme against S. molesta in South Africa were made. The disease covers the entire distribution range of C. salviniae in South Africa, with the disease occurrence rate ranging from 92.15% to 100% insects infected per site. Helicosporidium sp. was found to transmit vertically within the populations of C. salviniae. Infection by the Helicosporidium sp. disease reduced the reproductive output of C. salviniae as well its impact on biomass reduction of S. molesta when a diseased culture was compared to a healthy culture from the USA. 98.44 to 98.55% of Helicosporidium sp. loads were reduced through multiple applications of ketoconazole concentrations under in vitro trials. In vivo treatments resulted in 70% control of Helicosporidium sp. in the adults of C. salviniae that were fed ketoconazole three times over a 21 day period. Adult C. salviniae feeding and survival performances were similar when fed fronds of S. molesta inoculated with ketoconazole and water. The lowest and highest disease loads of Helicosporidium sp. were recorded when the weevils were reared at 30°C and 14°C, respectively. As expected, the highest impact and reproductive output of C. salviniae were at 30°C. The evaluations discussed in this thesis highlight the role of diseases in biological control agents, and gaps in both the pre-release and post-release monitoring that should integrate screening of diseases in these studies. Although the combined application of the antibiotic and temperature will reduce Helicosporidium sp. loads and impact, this technology is most likely only applicable where the weevils are reared in small numbers in a rearing facility and not really applicable to the field situation. It is important to release healthy agents that will cause efficient control of the target weed plant species, therefore, when introducing new biological control agents, the health status of such agents needs to be understood. Therefore, long-term field monitoring and assessment of the impact of C. salviniae on S. molesta should be conducted to track all the changes that may result due to the presence of Helicosporidium sp. This long-term monitoring and assessment will give a more informative role of Helicosporidium sp. in field populations of C. salviniae. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2022
- Full Text:
- Date Issued: 2022-10-14
Oversight mechanisms and service delivery: a case study of municipal public accounts committee oversight of electricity services in Raymond Mhlaba Local Municipality
- Authors: Mpofu, Sibabalwe
- Date: 2022-10-14
- Subjects: Municipal services South Africa , Local government South Africa , Local service delivery , Public sector , Oversight , Economics Sociological aspects , Government accountability South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/408671 , vital:70515
- Description: Over the last few years, there has been a notable increase in popularity in the use of cannabidiol (CBD) as a form of alternative medicinal treatment for various illnesses. CBD, a by-product of the cannabis plant, is an isolate and does not contain the psychoactive agent, tetrahydrocannabinol (THC). Endometriosis and Polycystic Ovarian Syndrome (PCOS) are chronic reproductive health sicknesses that are increasingly experienced by women. In the absence of cures, biomedical treatment for these diseases aim to manage symptoms, for example; heavy bleeding, heightened levels of pain, and insomnia. CBD offers an alternative to women who feel that biomedical interventions are no longer able to maintain their health and well-being. CBD positions itself as a natural remedy claiming to be safe and effective. This research study, mainly through qualitative data collection, focused on experiences of Zimbabwean and South African women living with endometriosis and/ or PCOS, who have turned to CBD to manage their symptoms. The importance of this study was to position itself within patients’ lived experiences. The research study found that CBD indeed has numerous benefits, including pain management, alleviating stress, and anxiety. Through the emergent themes from the data, it became clear that women are marginalised and treated unequally in the biomedical healthcare sphere. Feminist Anthropology and Structural Violence was applied to analyse the data collected to explore the patriarchal nature of the biomedical healthcare system and the experiences that women have, which has led them to turn to alternative treatments. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mpofu, Sibabalwe
- Date: 2022-10-14
- Subjects: Municipal services South Africa , Local government South Africa , Local service delivery , Public sector , Oversight , Economics Sociological aspects , Government accountability South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/408671 , vital:70515
- Description: Over the last few years, there has been a notable increase in popularity in the use of cannabidiol (CBD) as a form of alternative medicinal treatment for various illnesses. CBD, a by-product of the cannabis plant, is an isolate and does not contain the psychoactive agent, tetrahydrocannabinol (THC). Endometriosis and Polycystic Ovarian Syndrome (PCOS) are chronic reproductive health sicknesses that are increasingly experienced by women. In the absence of cures, biomedical treatment for these diseases aim to manage symptoms, for example; heavy bleeding, heightened levels of pain, and insomnia. CBD offers an alternative to women who feel that biomedical interventions are no longer able to maintain their health and well-being. CBD positions itself as a natural remedy claiming to be safe and effective. This research study, mainly through qualitative data collection, focused on experiences of Zimbabwean and South African women living with endometriosis and/ or PCOS, who have turned to CBD to manage their symptoms. The importance of this study was to position itself within patients’ lived experiences. The research study found that CBD indeed has numerous benefits, including pain management, alleviating stress, and anxiety. Through the emergent themes from the data, it became clear that women are marginalised and treated unequally in the biomedical healthcare sphere. Feminist Anthropology and Structural Violence was applied to analyse the data collected to explore the patriarchal nature of the biomedical healthcare system and the experiences that women have, which has led them to turn to alternative treatments. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
High road or common neoliberal trajectory? Collective bargaining, wage share, and varieties of capitalism
- Mpuku, Mutale Natasha Muchule
- Authors: Mpuku, Mutale Natasha Muchule
- Date: 2022-10-14
- Subjects: Collective bargaining , Globalization , Labor union members , Wages Statistics , Income distribution , Economic development , Neoliberalism , Capitalism
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/357611 , vital:64760
- Description: Wage shares have been falling since the 1980s across developing and developed countries. There has also been a downward trend with labour market institutions in these countries, with a few exceptions. This thesis analyzes these trends using firstly an extended literature review and secondly an econometrics analysis of a panel of 36 countries over 39 years. The extended literature review identified two broad competing narratives surrounding this topic: the mainstream and the alternative growth narratives. They both focus on two different growth regimes, the former, posits that growth is profit-led and the latter that growth is wage-led. Both are not ‘zero sum’ processes and seem to offer the same end result (growth and development). However, profit-led growth seems to have two problems. First, at least in the medium run, there is a trade-off between growth and income distribution. And secondly, profit-led growth is contradictory at the global level. Wage-led growth, which offers a ‘high road’ approach, seems far more appealing. Furthermore, several authors, including in South Africa, have claimed that regime-switching (to wage-led growth), is possible, and it seems that labour market institutions may play an important role in facilitating such a switch. However, the empirical literature, especially regarding middle- and low-income countries, is sparse and inconclusive. The panel data analysis provided by this thesis was not conclusive in establishing whether the wage-led, high road path is still viable for countries like South Africa. However, it did not find strong evidence of the contrary. The thesis concluded that there is scope for further research in this field and makes certain suggestions in this regard. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mpuku, Mutale Natasha Muchule
- Date: 2022-10-14
- Subjects: Collective bargaining , Globalization , Labor union members , Wages Statistics , Income distribution , Economic development , Neoliberalism , Capitalism
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/357611 , vital:64760
- Description: Wage shares have been falling since the 1980s across developing and developed countries. There has also been a downward trend with labour market institutions in these countries, with a few exceptions. This thesis analyzes these trends using firstly an extended literature review and secondly an econometrics analysis of a panel of 36 countries over 39 years. The extended literature review identified two broad competing narratives surrounding this topic: the mainstream and the alternative growth narratives. They both focus on two different growth regimes, the former, posits that growth is profit-led and the latter that growth is wage-led. Both are not ‘zero sum’ processes and seem to offer the same end result (growth and development). However, profit-led growth seems to have two problems. First, at least in the medium run, there is a trade-off between growth and income distribution. And secondly, profit-led growth is contradictory at the global level. Wage-led growth, which offers a ‘high road’ approach, seems far more appealing. Furthermore, several authors, including in South Africa, have claimed that regime-switching (to wage-led growth), is possible, and it seems that labour market institutions may play an important role in facilitating such a switch. However, the empirical literature, especially regarding middle- and low-income countries, is sparse and inconclusive. The panel data analysis provided by this thesis was not conclusive in establishing whether the wage-led, high road path is still viable for countries like South Africa. However, it did not find strong evidence of the contrary. The thesis concluded that there is scope for further research in this field and makes certain suggestions in this regard. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2022
- Full Text:
- Date Issued: 2022-10-14
A review of the Siyakhula Living Lab’s network solution for Internet in marginalized communities
- Muchatibaya, Hilbert Munashe
- Authors: Muchatibaya, Hilbert Munashe
- Date: 2022-10-14
- Subjects: Information and communication technologies for development , Information technology South Africa , Access network , User experience , Local area networks (Computer networks) South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/364943 , vital:65664
- Description: Changes within Information and Communication Technology (ICT) over the past decade required a review of the network layer component deployed in the Siyakhula Living Lab (SLL), a long-term joint venture between the Telkom Centres of Excellence hosted at University of Fort Hare and Rhodes University in South Africa. The SLL overall solution for the sustainable internet in poor communities consists of three main components – the computing infrastructure layer, the network layer, and the e-services layer. At the core of the network layer is the concept of BI, a high-speed local area network realized through easy-to deploy wireless technologies that establish point-to-multipoint connections among schools within a limited geographical area. Schools within the broadband island become then Digital Access Nodes (DANs), with computing infrastructure that provides access to the network. The review, reported in this thesis, aimed at determining whether the model for the network layer was still able to meet the needs of marginalized communities in South Africa, given the recent changes in ICT. The research work used the living lab methodology – a grassroots, user-driven approach that emphasizes co-creation between the beneficiaries and external entities (researchers, industry partners and the government) - to do viability tests on the solution for the network component. The viability tests included lab and field experiments, to produce the qualitative and quantitative data needed to propose an updated blueprint. The results of the review found that the network topology used in the SLL’s network, the BI, is still viable, while WiMAX is now outdated. Also, the in-network web cache, Squid, is no longer effective, given the switch to HTTPS and the pervasive presence of advertising. The solution to the first issue is outdoor Wi-Fi, a proven solution easily deployable in grass-roots fashion. The second issue can be mitigated by leveraging Squid’s ‘bumping’ and splicing features; deploying a browser extension to make picture download optional; and using Pihole, a DNS sinkhole. Hopefully, the revised solution could become a component of South African Government’s broadband plan, “SA Connect”. , Thesis (MSc) -- Faculty of Science, Computer Science, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Muchatibaya, Hilbert Munashe
- Date: 2022-10-14
- Subjects: Information and communication technologies for development , Information technology South Africa , Access network , User experience , Local area networks (Computer networks) South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/364943 , vital:65664
- Description: Changes within Information and Communication Technology (ICT) over the past decade required a review of the network layer component deployed in the Siyakhula Living Lab (SLL), a long-term joint venture between the Telkom Centres of Excellence hosted at University of Fort Hare and Rhodes University in South Africa. The SLL overall solution for the sustainable internet in poor communities consists of three main components – the computing infrastructure layer, the network layer, and the e-services layer. At the core of the network layer is the concept of BI, a high-speed local area network realized through easy-to deploy wireless technologies that establish point-to-multipoint connections among schools within a limited geographical area. Schools within the broadband island become then Digital Access Nodes (DANs), with computing infrastructure that provides access to the network. The review, reported in this thesis, aimed at determining whether the model for the network layer was still able to meet the needs of marginalized communities in South Africa, given the recent changes in ICT. The research work used the living lab methodology – a grassroots, user-driven approach that emphasizes co-creation between the beneficiaries and external entities (researchers, industry partners and the government) - to do viability tests on the solution for the network component. The viability tests included lab and field experiments, to produce the qualitative and quantitative data needed to propose an updated blueprint. The results of the review found that the network topology used in the SLL’s network, the BI, is still viable, while WiMAX is now outdated. Also, the in-network web cache, Squid, is no longer effective, given the switch to HTTPS and the pervasive presence of advertising. The solution to the first issue is outdoor Wi-Fi, a proven solution easily deployable in grass-roots fashion. The second issue can be mitigated by leveraging Squid’s ‘bumping’ and splicing features; deploying a browser extension to make picture download optional; and using Pihole, a DNS sinkhole. Hopefully, the revised solution could become a component of South African Government’s broadband plan, “SA Connect”. , Thesis (MSc) -- Faculty of Science, Computer Science, 2022
- Full Text:
- Date Issued: 2022-10-14
Design, synthesis, manufacture, characterization and evaluation of lipid nanocapsules in chitosan-iota-carrageenan based hydrogel scaffold as a potential anti-Covid-19 drug delivery system
- Authors: Mukubwa, Grady Kathondo
- Date: 2022-10-14
- Subjects: Nanocapsules Design , Hydrogel , COVID-19 (Disease) , Characterization , Drug delivery systems
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/364955 , vital:65665
- Description: Covid-19 is a deadly viral disease that has been rampant around the world since 2019. Although the successful introduction of the vaccine has reduced the spread of covid-19, new cases and deaths are still being recorded. To date, no specific curative antiviral treatment has been approved for covid-19. However, many existing antiviral drugs have been and are still being studied against covid-19 and some of them, such as Remdesivir, have shown promise and could be repurposed to treat this infection. Unfortunately, antiviral drugs are prone to resistance as most of them have poor biopharmaceutical properties, including low solubility, permeability and bioavailability, which could hinder any clinical success. Recent advances in nanotechnology-based delivery systems have made it possible to improve the biopharmaceutical properties of many drugs, especially those of poorly water-soluble drugs, by formulating them as lipid nanoparticles (LNP). Thus, in order to contribute to the fight against covid-19, this work aimed to develop Lipid Nanocapsules (LNC), based on some natural raw materials, which could improve the biopharmaceutical properties of antiviral drugs. In addition, since covid-19 infection is mainly respiratory, this work also aimed to fabricate a targeted delivery system based on a hydrogel capable of entrapping LNC and ensuring their efficient deposition and release in the lungs. The LNC consisted of a mixture of medium-chain triglycerides oil (MCT oil), crude soy lecithin, tween 80, NaCl and water, while the hydrogel consisted of a chitosan-grafted-iota carrageenan-grafted-poly (acrylamide-co-acrylic acid) system (CS-iCar-p (AAm-Co-AA)). Efavirenz (EFV), a drug with very low water solubility that has recently been demonstrated to have the potential to influence sars-cov-2 life cycle through different targets (3CLP, RdRp, Hellicase, 3’to5’exonuclease, 2’-O-ribose methyltransferase and EndoRNAse), was chosen as the model drug to evaluate the developed delivery system. The combination of LNP and hydrogel results in a delivery system known as the LNP-hydrogel composite, an emerging area of research in the field of drug delivery. To date, no research has reported the design and fabrication of an LNC-CS-iCar-p (AAm-Co-AA) hydrogel composite that could effectively deliver an antiviral drug to the lungs in addition to its advantages in terms of biological activities. Prior to the design of experiment, EFV solubility was assessed in water, labrafac lipophile 1349 and MCT oil. After that, the Design Expert Software version 13 was used to design the different experiments performed in this work. The I-optimal mixture design of experiments was performed for both LNC preparation and CS-iCar-p (AAm-Co-AA) hydrogel synthesis to study the impact of raw materials on the characteristics of these delivery systems. LNC were prepared using the phase inversion method while the free radical precipitation graft copolymerization method was used to synthesize hydrogel. In order to build polynomial models that could predict the amount of drug both LNC and CS-iCar-p (AAm-Co-AA) hydrogel can entrap, a D-optimal (custom) randomized design was performed. Moreover, various characterization techniques were used to investigate the physicochemical properties of the developed delivery systems. Thereafter, drug release studies were performed using a 1% sodium lauryl sulfate solution adjusted to either pH 4 or 7. Solubility studies revealed that EFV was more soluble in labrafac lipophile 1349 and in MCT oil than in water; therefore, given its affordability, MCT oil was used for the LNC formulation. The design of experiment carried out allowed the construction of polynomial models that could predict, on the one hand, the droplet size, the polydispersity index and the Zeta potential of LNC, which were respectively around 50nm, below 0.2 and below -33. On the other hand, the model could predict the swelling capacity of the synthesized hydrogel, which was optimised to about 30,000% (300 g of water to 1 g of hydrogel). This turned out to be influenced by the proportion of polymers, the ratio of monomers as well as the concentration of the cross-linking agent. In addition, the characterization techniques further supported the improvement of EFV solubility by highlighting its conversion into its amorphous state after encapsulation in LNC. They also confirmed successful synthesis of CS-iCar-p (AAm-co-AA) hydrogel. LNC were able to encapsulate about 87% of EFV while the synthesized CS-iCar-p (AAm-co-AA) hydrogel entrapped around 53% of EFV encapsulated in LNC. While LNC were able to release 42% and 27% of EFV after 74 hours in a 1% sodium lauryl sulfate solution (SLS) at pH 7 and pH 4 respectively, the LNC-CS-iCar-p (AAm-co-AA) hydrogel composite released about 50% and 40% of the drug after 9 days in the same release medium. Interestingly, the chemical integrity of the drug was preserved throughout the manufacturing process up to after its release, suggesting that the developed LNC-CS-iCar-p (AAm-co-AA) hydrogel composite could be used as a novel potential anticovid-19 drugs delivery system. , Thesis (MSc) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mukubwa, Grady Kathondo
- Date: 2022-10-14
- Subjects: Nanocapsules Design , Hydrogel , COVID-19 (Disease) , Characterization , Drug delivery systems
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/364955 , vital:65665
- Description: Covid-19 is a deadly viral disease that has been rampant around the world since 2019. Although the successful introduction of the vaccine has reduced the spread of covid-19, new cases and deaths are still being recorded. To date, no specific curative antiviral treatment has been approved for covid-19. However, many existing antiviral drugs have been and are still being studied against covid-19 and some of them, such as Remdesivir, have shown promise and could be repurposed to treat this infection. Unfortunately, antiviral drugs are prone to resistance as most of them have poor biopharmaceutical properties, including low solubility, permeability and bioavailability, which could hinder any clinical success. Recent advances in nanotechnology-based delivery systems have made it possible to improve the biopharmaceutical properties of many drugs, especially those of poorly water-soluble drugs, by formulating them as lipid nanoparticles (LNP). Thus, in order to contribute to the fight against covid-19, this work aimed to develop Lipid Nanocapsules (LNC), based on some natural raw materials, which could improve the biopharmaceutical properties of antiviral drugs. In addition, since covid-19 infection is mainly respiratory, this work also aimed to fabricate a targeted delivery system based on a hydrogel capable of entrapping LNC and ensuring their efficient deposition and release in the lungs. The LNC consisted of a mixture of medium-chain triglycerides oil (MCT oil), crude soy lecithin, tween 80, NaCl and water, while the hydrogel consisted of a chitosan-grafted-iota carrageenan-grafted-poly (acrylamide-co-acrylic acid) system (CS-iCar-p (AAm-Co-AA)). Efavirenz (EFV), a drug with very low water solubility that has recently been demonstrated to have the potential to influence sars-cov-2 life cycle through different targets (3CLP, RdRp, Hellicase, 3’to5’exonuclease, 2’-O-ribose methyltransferase and EndoRNAse), was chosen as the model drug to evaluate the developed delivery system. The combination of LNP and hydrogel results in a delivery system known as the LNP-hydrogel composite, an emerging area of research in the field of drug delivery. To date, no research has reported the design and fabrication of an LNC-CS-iCar-p (AAm-Co-AA) hydrogel composite that could effectively deliver an antiviral drug to the lungs in addition to its advantages in terms of biological activities. Prior to the design of experiment, EFV solubility was assessed in water, labrafac lipophile 1349 and MCT oil. After that, the Design Expert Software version 13 was used to design the different experiments performed in this work. The I-optimal mixture design of experiments was performed for both LNC preparation and CS-iCar-p (AAm-Co-AA) hydrogel synthesis to study the impact of raw materials on the characteristics of these delivery systems. LNC were prepared using the phase inversion method while the free radical precipitation graft copolymerization method was used to synthesize hydrogel. In order to build polynomial models that could predict the amount of drug both LNC and CS-iCar-p (AAm-Co-AA) hydrogel can entrap, a D-optimal (custom) randomized design was performed. Moreover, various characterization techniques were used to investigate the physicochemical properties of the developed delivery systems. Thereafter, drug release studies were performed using a 1% sodium lauryl sulfate solution adjusted to either pH 4 or 7. Solubility studies revealed that EFV was more soluble in labrafac lipophile 1349 and in MCT oil than in water; therefore, given its affordability, MCT oil was used for the LNC formulation. The design of experiment carried out allowed the construction of polynomial models that could predict, on the one hand, the droplet size, the polydispersity index and the Zeta potential of LNC, which were respectively around 50nm, below 0.2 and below -33. On the other hand, the model could predict the swelling capacity of the synthesized hydrogel, which was optimised to about 30,000% (300 g of water to 1 g of hydrogel). This turned out to be influenced by the proportion of polymers, the ratio of monomers as well as the concentration of the cross-linking agent. In addition, the characterization techniques further supported the improvement of EFV solubility by highlighting its conversion into its amorphous state after encapsulation in LNC. They also confirmed successful synthesis of CS-iCar-p (AAm-co-AA) hydrogel. LNC were able to encapsulate about 87% of EFV while the synthesized CS-iCar-p (AAm-co-AA) hydrogel entrapped around 53% of EFV encapsulated in LNC. While LNC were able to release 42% and 27% of EFV after 74 hours in a 1% sodium lauryl sulfate solution (SLS) at pH 7 and pH 4 respectively, the LNC-CS-iCar-p (AAm-co-AA) hydrogel composite released about 50% and 40% of the drug after 9 days in the same release medium. Interestingly, the chemical integrity of the drug was preserved throughout the manufacturing process up to after its release, suggesting that the developed LNC-CS-iCar-p (AAm-co-AA) hydrogel composite could be used as a novel potential anticovid-19 drugs delivery system. , Thesis (MSc) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-10-14
Youth, political violence and ZANU-PF politics in Zimbabwe, c.1950-2018
- Authors: Munyarari, Tinashe
- Date: 2022-10-14
- Subjects: Youth protest movements Zimbabwe , Political violence Zimbabwe , ZANU-PF (Organization : Zimbabwe) , Agent (Philosophy) , Zimbabwe Politics and government , Zimbabwe History
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365966 , vital:65806 , DOI https://doi.org/10.21504/10962/365966
- Description: This study is a socio-political aspect of Zimbabwean history. It examines the development of youth political violence starting from the late 1950s when violent forms of African political mobilisation emerged to 2018 when the first election without Robert Mugabe was held. It explores how early nationalist parties such as the Salisbury City Youth League (SCYL), Southern Rhodesia African National Congress (SRANC), National Democratic Party (NDP), Zimbabwe African People’s Union (ZAPU) and later the Zimbabwe African National Union (ZANU) mobilised and socialised youths into political violence to understand the roots of the violent political culture in Zimbabwe. This study shows that youths were an important part of the strategies of these political parties in countering the violence of the colonial state as well as mobilising mass support for the movements during the liberation struggle. It reveals that war collaborators (mujibhas and chimbwidos) were central role players in instigating political violence against innocent and defenceless people during the war. In the 1980s and 1990s, the Youth brigades and the ZANU-PF Youth League became a key constituent for state-socialist developmental goals but they were at times manipulated as a resource for political violence when Mugabe’s power was challenged. The study shows that more grotesque violence occurred in the 2000s era when the National Youth Service (NYS) was introduced and state-sanctioned vigilante groups like Chipangano in Mbare emerged in response to the rise of the Movement for Democratic Change (MDC) and diminishing of consensual power. This study argues that youth were not mere victims and perpetrators of political violence, but they were a collection of various interest sub-groups with diverse agendas and a sense of agency. Some joined violent groups for their social mobility, power, impunity and economic opportunities availed to the group members. Data for this study was drawn from Mbare and Highfields (in Harare Province) and Uzumba-Maramba-Pfungwe (in Mashonaland East Province). , Thesis (PhD) -- Faculty of Humanities, History, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Munyarari, Tinashe
- Date: 2022-10-14
- Subjects: Youth protest movements Zimbabwe , Political violence Zimbabwe , ZANU-PF (Organization : Zimbabwe) , Agent (Philosophy) , Zimbabwe Politics and government , Zimbabwe History
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365966 , vital:65806 , DOI https://doi.org/10.21504/10962/365966
- Description: This study is a socio-political aspect of Zimbabwean history. It examines the development of youth political violence starting from the late 1950s when violent forms of African political mobilisation emerged to 2018 when the first election without Robert Mugabe was held. It explores how early nationalist parties such as the Salisbury City Youth League (SCYL), Southern Rhodesia African National Congress (SRANC), National Democratic Party (NDP), Zimbabwe African People’s Union (ZAPU) and later the Zimbabwe African National Union (ZANU) mobilised and socialised youths into political violence to understand the roots of the violent political culture in Zimbabwe. This study shows that youths were an important part of the strategies of these political parties in countering the violence of the colonial state as well as mobilising mass support for the movements during the liberation struggle. It reveals that war collaborators (mujibhas and chimbwidos) were central role players in instigating political violence against innocent and defenceless people during the war. In the 1980s and 1990s, the Youth brigades and the ZANU-PF Youth League became a key constituent for state-socialist developmental goals but they were at times manipulated as a resource for political violence when Mugabe’s power was challenged. The study shows that more grotesque violence occurred in the 2000s era when the National Youth Service (NYS) was introduced and state-sanctioned vigilante groups like Chipangano in Mbare emerged in response to the rise of the Movement for Democratic Change (MDC) and diminishing of consensual power. This study argues that youth were not mere victims and perpetrators of political violence, but they were a collection of various interest sub-groups with diverse agendas and a sense of agency. Some joined violent groups for their social mobility, power, impunity and economic opportunities availed to the group members. Data for this study was drawn from Mbare and Highfields (in Harare Province) and Uzumba-Maramba-Pfungwe (in Mashonaland East Province). , Thesis (PhD) -- Faculty of Humanities, History, 2022
- Full Text:
- Date Issued: 2022-10-14
Exploring the lexical and semantic access afforded by novice and experienced Namibian physical science teachers’ talk during electricity and magnetism lessons
- Authors: Muzambani, Efraim Hiamueze
- Date: 2022-10-14
- Subjects: Knowledge, Theory of , Education, Secondary Aims and objectives Namibia , Science Study and teaching (Secondary) Namibia , Systemic functional linguistics , Lexical density , Electricity Study and teaching (Secondary) Namibia , Magnetism Study and teaching (Secondary) Namibia
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/405346 , vital:70163
- Description: Challenges to learners’ meaning-making in the topic of electricity and magnetism contributes to underperformance in grade 10 Physical Science in Namibian schools. Teacher talk in content-based classrooms not only contributes to learners’ language development (Gibbons, 2003), but also facilitates meaning-making and cumulative knowledge-building (Halliday, 1999). However, it is possible that there are differences between the classrooms talk of novice and experienced Namibian Physical Science teachers. An understanding of differences between experienced and novice Namibian science teacher talk could inform teacher training and professional development and potentially help improve learners’ meaning-making in topics such as electricity and magnetism. However, no study could be found in the Namibian context which explored whether novice and experienced teacher talk afforded similar semantic and lexical access to meaning-making. This research gap provided a strong rationale for undertaking the study reported in this thesis. The study sought to investigate the extent to which novice and experienced grade 10 Namibian Physical Science teachers’ classroom talk provides semantic and lexical access to learners for the topic of electricity and magnetism. The research is informed by Legitimation Code Theory (LCT) and Systemic Functional Linguistics (SFL). Research has shown that the two theories are complementary and can be used to characterize teachers’ pedagogical practices (Maton, 2014). A quantitative case study methodology was followed in this study with LCT’s semantic density and SFL’s lexical density as analytical tools to analyze the two teachers’ classroom talk. The results from a t-test for semantic density show that there is a significant difference in the means for “semantic density waving” criterion (t-value of -2.331; p-value for 2 tail test at 95% level of 0.0040) and for the “linking downward escalators or single references” criterion (t-value of 4.649; p-value for 2 tail test at 95% level of 0.001) of teacher talk by the teachers. The overall results for semantic density indicate that the experienced teacher affords better epistemological access through semantic waves than the novice teacher, whereas the novice teacher affords better epistemological access through semantic range and semantic flow. In terms of lexical density, both teachers afforded similar access, characterized by their talk veering towards the level of information density associated with written text. The study makes a methodological contribution to science education research through its characterization of novice and experienced teachers’ talk in terms of semantic waves and lexical density. This study also provides empirical insight into the differences between language use by novice and experienced Namibian Physical Science teachers, which can inform the work of educational institutions, advisory and inspectorate services in the ministry of education, and school managers. Relevant Namibian stakeholders are encouraged to consider including the topics of semantic density and lexical density, in continuous professional development programmes towards improving the meaning-making affordances of science teachers’ talk. , Thesis (MEd) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Muzambani, Efraim Hiamueze
- Date: 2022-10-14
- Subjects: Knowledge, Theory of , Education, Secondary Aims and objectives Namibia , Science Study and teaching (Secondary) Namibia , Systemic functional linguistics , Lexical density , Electricity Study and teaching (Secondary) Namibia , Magnetism Study and teaching (Secondary) Namibia
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/405346 , vital:70163
- Description: Challenges to learners’ meaning-making in the topic of electricity and magnetism contributes to underperformance in grade 10 Physical Science in Namibian schools. Teacher talk in content-based classrooms not only contributes to learners’ language development (Gibbons, 2003), but also facilitates meaning-making and cumulative knowledge-building (Halliday, 1999). However, it is possible that there are differences between the classrooms talk of novice and experienced Namibian Physical Science teachers. An understanding of differences between experienced and novice Namibian science teacher talk could inform teacher training and professional development and potentially help improve learners’ meaning-making in topics such as electricity and magnetism. However, no study could be found in the Namibian context which explored whether novice and experienced teacher talk afforded similar semantic and lexical access to meaning-making. This research gap provided a strong rationale for undertaking the study reported in this thesis. The study sought to investigate the extent to which novice and experienced grade 10 Namibian Physical Science teachers’ classroom talk provides semantic and lexical access to learners for the topic of electricity and magnetism. The research is informed by Legitimation Code Theory (LCT) and Systemic Functional Linguistics (SFL). Research has shown that the two theories are complementary and can be used to characterize teachers’ pedagogical practices (Maton, 2014). A quantitative case study methodology was followed in this study with LCT’s semantic density and SFL’s lexical density as analytical tools to analyze the two teachers’ classroom talk. The results from a t-test for semantic density show that there is a significant difference in the means for “semantic density waving” criterion (t-value of -2.331; p-value for 2 tail test at 95% level of 0.0040) and for the “linking downward escalators or single references” criterion (t-value of 4.649; p-value for 2 tail test at 95% level of 0.001) of teacher talk by the teachers. The overall results for semantic density indicate that the experienced teacher affords better epistemological access through semantic waves than the novice teacher, whereas the novice teacher affords better epistemological access through semantic range and semantic flow. In terms of lexical density, both teachers afforded similar access, characterized by their talk veering towards the level of information density associated with written text. The study makes a methodological contribution to science education research through its characterization of novice and experienced teachers’ talk in terms of semantic waves and lexical density. This study also provides empirical insight into the differences between language use by novice and experienced Namibian Physical Science teachers, which can inform the work of educational institutions, advisory and inspectorate services in the ministry of education, and school managers. Relevant Namibian stakeholders are encouraged to consider including the topics of semantic density and lexical density, in continuous professional development programmes towards improving the meaning-making affordances of science teachers’ talk. , Thesis (MEd) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-10-14
Development of biosensor systems for the detection of anti-cancer drugs and prostate cancer
- Authors: Mwanza, Daniel
- Date: 2022-10-14
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365929 , vital:65803
- Description: Thesis embargoed. Expected release date early 2025. , Thesis (PhD) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mwanza, Daniel
- Date: 2022-10-14
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365929 , vital:65803
- Description: Thesis embargoed. Expected release date early 2025. , Thesis (PhD) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-10-14
An investigation of how newly appointed team leaders in an automotive manufacturing organisation experience the role transition from specialists to team leaders
- Authors: Mzelemu, Patrick Sbusiso
- Date: 2022-10-14
- Subjects: Leadership , Automobile industry executives , Role expectation , Identity (Psychology) , Personnel management , Organizational behavior
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/403036 , vital:69916
- Description: The purpose of this study is to investigate and understand how specialists who are newly appointed team leaders in an automotive manufacturing organisation experience the transition from specialists to team leaders. The role of leading others in an organisation is linked to human resource leadership. The human resource is highlighted as a valuable resource as it is the only thinking resource in an organisation. It also influences cost and quality and it is central to the organisation's competitive advantage. Consequently, any interruptions or lack of effective management of the human resource will result in a loss of value that the human resource brings into the organisation since they maximise the use of all other resources. The role transitioning process takes place in three phases. These are the separation, transitioning and incorporation phases. In the separation phase, the transitioning individuals have difficulty detaching from their previous role; the individuals still having the urge to do the work for their subordinates instead of delegating illustrate this. In the transition phase, the individuals in the study experienced the anxiety of wanting to make the new role a success whilst experiencing a sense of lack of belonging due to not being in the familiar old role and not entrenched in the new role. In the incorporation phase, the transitioning individuals experience a sense of stability where they are comfortable acting in the new role. Problem: This study aims to answer the question of how newly appointed team leaders in an automotive manufacturing organisation experience role transition from specialists to team leaders Method: The study will be employing the qualitative thematic deductive method. The target population consists of team leaders who have transitioned into the team leader position in the past two years in different departments. The data was collected by way of face-to-face semistructured interviews with a sample size of seven participants. Data analysis was conducted with a method that is consistent with thematic analysis. 3 Key Findings: Individuals transitioning have urgencies to perform their previous roles in the early phase; during the transition phase, they have anxiety because they are not yet successful in the new role, and in the final phase, they have become comfortable with their new roles and their new identities. Implications: The study's outcome is to identify insights and resultant recommendations for non-leading specialists transitioning into roles where they have to lead others. The study will add to the research in the field of leadership behaviour and organisational behaviour. , Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Mzelemu, Patrick Sbusiso
- Date: 2022-10-14
- Subjects: Leadership , Automobile industry executives , Role expectation , Identity (Psychology) , Personnel management , Organizational behavior
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/403036 , vital:69916
- Description: The purpose of this study is to investigate and understand how specialists who are newly appointed team leaders in an automotive manufacturing organisation experience the transition from specialists to team leaders. The role of leading others in an organisation is linked to human resource leadership. The human resource is highlighted as a valuable resource as it is the only thinking resource in an organisation. It also influences cost and quality and it is central to the organisation's competitive advantage. Consequently, any interruptions or lack of effective management of the human resource will result in a loss of value that the human resource brings into the organisation since they maximise the use of all other resources. The role transitioning process takes place in three phases. These are the separation, transitioning and incorporation phases. In the separation phase, the transitioning individuals have difficulty detaching from their previous role; the individuals still having the urge to do the work for their subordinates instead of delegating illustrate this. In the transition phase, the individuals in the study experienced the anxiety of wanting to make the new role a success whilst experiencing a sense of lack of belonging due to not being in the familiar old role and not entrenched in the new role. In the incorporation phase, the transitioning individuals experience a sense of stability where they are comfortable acting in the new role. Problem: This study aims to answer the question of how newly appointed team leaders in an automotive manufacturing organisation experience role transition from specialists to team leaders Method: The study will be employing the qualitative thematic deductive method. The target population consists of team leaders who have transitioned into the team leader position in the past two years in different departments. The data was collected by way of face-to-face semistructured interviews with a sample size of seven participants. Data analysis was conducted with a method that is consistent with thematic analysis. 3 Key Findings: Individuals transitioning have urgencies to perform their previous roles in the early phase; during the transition phase, they have anxiety because they are not yet successful in the new role, and in the final phase, they have become comfortable with their new roles and their new identities. Implications: The study's outcome is to identify insights and resultant recommendations for non-leading specialists transitioning into roles where they have to lead others. The study will add to the research in the field of leadership behaviour and organisational behaviour. , Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 2022
- Full Text:
- Date Issued: 2022-10-14
Bioinformatics tool and web server development focusing on structural bioinformatics applications
- Authors: Nabatanzi, Margaret
- Date: 2022-10-14
- Subjects: Structural bioinformatics , Proteins Structure , Protein structure prediction , Proteins Conformation , Protein complex
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365700 , vital:65777 , DOI https://doi.org/10.21504/10962/365700
- Description: This thesis is divided into two main sections: Part 1 describes the design, and evaluation of the accuracy of a new web server – PRotein Interactive MOdeling (PRIMO-Complexes) for modeling protein complexes and biological assemblies. The second part describes the development of bioinformatics tools to predict HIV-1 drug resistance and support bioinformatics research and education. Recent technological advances have resulted in a tremendous increase in the number of sequences and protein structures deposited in the Universal Protein Resource Knowledgebase (UniProtKB) and the Protein Data Bank (PDB). However, the number of sequences has increased at a higher rate compared with the experimentally solved multimeric protein structures. This is partly due to advances in high-throughput sequencing technology. To fill this protein sequence-structure gap, computational approaches have been developed to predict protein structures from available sequences. Computational approaches include template-based and ab initio modeling with the former being the most reliable. Template-based modeling process can be achieved using either standalone software or automated modeling web servers. However, using standalone software requires familiarity with command-line interfaces as well as utilising other intermediate programs which could be daunting to novice users. To alleviate some of these problems, the modeling process has been automated, however, it still has numerous challenges. To date, only a few web servers that support multimeric protein modeling have been developed and even these provide little, if any user involvement in the process. To address some of these issues, a new web server – PRIMO-Complexes – was developed to model protein complexes and biological assemblies. The existing PRIMO web server could only model monomeric proteins. Part 1 of this thesis provides a detailed account of the development and evaluation of PRIMO-Complexes. The rationale for developing this new web server was based on the understanding that most proteins function as protein multimers and often the ligand-binding sites, and enzyme active sites are located at the protein-protein interfaces. It, therefore, necessitated developing capabilities for modeling multimeric proteins. PRIMO-Complexes web server was developed using the Waterfall system development life cycle model, is based on the Django web framework and makes use of high-performance computing resources to execute jobs. The accuracy of the algorithms embedded in PRIMO- Complexes was evaluated and the results were promising. Additionally, PRIMO-Complexes performs comparatively well in relation to other web servers that offer multimeric protein modeling. Another unique feature of PRIMO-Complexes is its interactivity. The webserver was developed with capabilities for allowing users to model multimeric proteins with an appreciable degree of control over the process. In the second part of the thesis several other bioinformatics tools are described, for example, a webserver for predicting HIV-1 drug resistance, the RUBi protein model repository, and a bioinformatics web portal for education and research resources. RUBi protein model repository stores verified theoretical models built using various modeling approaches. This enables users to easily access models to reproduce and/or further the research. This is described in chapter 5. Chapter 6 describes the design and development of the Human Immunodeficiency type 1 Resistance Predictor (HIV-1 ResPredictor), a web application that employs artificial neural networks (ANN) to predict drug resistance in patients infected with HIV-1 subtype B. The ANNs and subtype classifiers performed well making this web application potentially useful to both clinicians and researchers in this era of personalised medicine. Finally, chapter 7 describes a bioinformatics education web portal that equips students with information on how to use bioinformatics online resources. Being aware of these resources is not enough without a deeper understanding and guidance on how to apply bioinformatics methods to solve practical problems. This web portal was aimed at familiarising students with the basic terminology and approaches in structural bioinformatics. Students will potentially gain skills to conduct real-life bioinformatics research to obtain biological insights. , Thesis (PhD) -- Faculty of Science, Biochemistry and Microbiology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nabatanzi, Margaret
- Date: 2022-10-14
- Subjects: Structural bioinformatics , Proteins Structure , Protein structure prediction , Proteins Conformation , Protein complex
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365700 , vital:65777 , DOI https://doi.org/10.21504/10962/365700
- Description: This thesis is divided into two main sections: Part 1 describes the design, and evaluation of the accuracy of a new web server – PRotein Interactive MOdeling (PRIMO-Complexes) for modeling protein complexes and biological assemblies. The second part describes the development of bioinformatics tools to predict HIV-1 drug resistance and support bioinformatics research and education. Recent technological advances have resulted in a tremendous increase in the number of sequences and protein structures deposited in the Universal Protein Resource Knowledgebase (UniProtKB) and the Protein Data Bank (PDB). However, the number of sequences has increased at a higher rate compared with the experimentally solved multimeric protein structures. This is partly due to advances in high-throughput sequencing technology. To fill this protein sequence-structure gap, computational approaches have been developed to predict protein structures from available sequences. Computational approaches include template-based and ab initio modeling with the former being the most reliable. Template-based modeling process can be achieved using either standalone software or automated modeling web servers. However, using standalone software requires familiarity with command-line interfaces as well as utilising other intermediate programs which could be daunting to novice users. To alleviate some of these problems, the modeling process has been automated, however, it still has numerous challenges. To date, only a few web servers that support multimeric protein modeling have been developed and even these provide little, if any user involvement in the process. To address some of these issues, a new web server – PRIMO-Complexes – was developed to model protein complexes and biological assemblies. The existing PRIMO web server could only model monomeric proteins. Part 1 of this thesis provides a detailed account of the development and evaluation of PRIMO-Complexes. The rationale for developing this new web server was based on the understanding that most proteins function as protein multimers and often the ligand-binding sites, and enzyme active sites are located at the protein-protein interfaces. It, therefore, necessitated developing capabilities for modeling multimeric proteins. PRIMO-Complexes web server was developed using the Waterfall system development life cycle model, is based on the Django web framework and makes use of high-performance computing resources to execute jobs. The accuracy of the algorithms embedded in PRIMO- Complexes was evaluated and the results were promising. Additionally, PRIMO-Complexes performs comparatively well in relation to other web servers that offer multimeric protein modeling. Another unique feature of PRIMO-Complexes is its interactivity. The webserver was developed with capabilities for allowing users to model multimeric proteins with an appreciable degree of control over the process. In the second part of the thesis several other bioinformatics tools are described, for example, a webserver for predicting HIV-1 drug resistance, the RUBi protein model repository, and a bioinformatics web portal for education and research resources. RUBi protein model repository stores verified theoretical models built using various modeling approaches. This enables users to easily access models to reproduce and/or further the research. This is described in chapter 5. Chapter 6 describes the design and development of the Human Immunodeficiency type 1 Resistance Predictor (HIV-1 ResPredictor), a web application that employs artificial neural networks (ANN) to predict drug resistance in patients infected with HIV-1 subtype B. The ANNs and subtype classifiers performed well making this web application potentially useful to both clinicians and researchers in this era of personalised medicine. Finally, chapter 7 describes a bioinformatics education web portal that equips students with information on how to use bioinformatics online resources. Being aware of these resources is not enough without a deeper understanding and guidance on how to apply bioinformatics methods to solve practical problems. This web portal was aimed at familiarising students with the basic terminology and approaches in structural bioinformatics. Students will potentially gain skills to conduct real-life bioinformatics research to obtain biological insights. , Thesis (PhD) -- Faculty of Science, Biochemistry and Microbiology, 2022
- Full Text:
- Date Issued: 2022-10-14
Conceptualising mental distress from an African psychology paradigm: using an interpretative phenomenological analysis of the views of traditional healers
- Nabo-Bazana, Sandisiwe Sifanelwe
- Authors: Nabo-Bazana, Sandisiwe Sifanelwe
- Date: 2022-10-14
- Subjects: Healers South Africa , Traditional healer , Mental distress , Black psychology , Afrocentrism
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406213 , vital:70249
- Description: With South Africa's long history of colonialism and racial oppression, there are still services in the country that many South Africans cannot relate to, including psychology. Research shows that many South Africans experience and are affected by mental distress due to several factors, including poverty, unemployment, and traumatic experiences. Managing and treating such distress has always been challenging for most South Africans. Some debates question the relevance of psychological services from the West in a South African context. This study explores other approaches to psychology that look beyond the Biopsychosocial model when dealing with certain types of disorders in an African context. African psychology, or the Afrocentric approach, looks at what is beneath the surface, not just the presenting problem. Mainstream psychology strives to be universal and applicable to all. However, African psychology disagrees with this notion. African psychology perceives human beings as strongly influenced by social and cultural influences. The focus of this approach includes the spiritual realm and the attached meanings. There is evidence for the need to merge Traditional and Western medicine. The research methodology for this study is qualitative, using Interpretative Phenomenological Analysis. IPA allows for a critical engagement with the ways in which participants construct their reality. The researcher carried out semi-structured interviews to enable participants, all traditional healers (3 female and 2 male), to narrate their experiences dealing with mentally distressed clients. The accounts of these traditional healers were analysed focusing on people who have experienced mental distress. From the analysis and synthesis of the themes, findings illustrate how traditional healers conceptualise and construct mental distress from an African Psychology paradigm. An emerging core theme was the importance of the divine call and its influence on the chosen treatments. More studies are needed to illustrate the potential for collaboration between African Traditional healing and EuroAmerican healing practices, to provide holistic services to people in need. , Thesis (MA) -- Faculty of Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nabo-Bazana, Sandisiwe Sifanelwe
- Date: 2022-10-14
- Subjects: Healers South Africa , Traditional healer , Mental distress , Black psychology , Afrocentrism
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406213 , vital:70249
- Description: With South Africa's long history of colonialism and racial oppression, there are still services in the country that many South Africans cannot relate to, including psychology. Research shows that many South Africans experience and are affected by mental distress due to several factors, including poverty, unemployment, and traumatic experiences. Managing and treating such distress has always been challenging for most South Africans. Some debates question the relevance of psychological services from the West in a South African context. This study explores other approaches to psychology that look beyond the Biopsychosocial model when dealing with certain types of disorders in an African context. African psychology, or the Afrocentric approach, looks at what is beneath the surface, not just the presenting problem. Mainstream psychology strives to be universal and applicable to all. However, African psychology disagrees with this notion. African psychology perceives human beings as strongly influenced by social and cultural influences. The focus of this approach includes the spiritual realm and the attached meanings. There is evidence for the need to merge Traditional and Western medicine. The research methodology for this study is qualitative, using Interpretative Phenomenological Analysis. IPA allows for a critical engagement with the ways in which participants construct their reality. The researcher carried out semi-structured interviews to enable participants, all traditional healers (3 female and 2 male), to narrate their experiences dealing with mentally distressed clients. The accounts of these traditional healers were analysed focusing on people who have experienced mental distress. From the analysis and synthesis of the themes, findings illustrate how traditional healers conceptualise and construct mental distress from an African Psychology paradigm. An emerging core theme was the importance of the divine call and its influence on the chosen treatments. More studies are needed to illustrate the potential for collaboration between African Traditional healing and EuroAmerican healing practices, to provide holistic services to people in need. , Thesis (MA) -- Faculty of Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-10-14
Big T’s and small T’s: an explorative study on trauma narratives in South Africa
- Authors: Naidoo, Rinisa
- Date: 2022-10-14
- Subjects: Psychic trauma , Anthropology , Mental health South Africa , Apartheid South Africa Personal narratives , Culture Psychological aspects
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/408641 , vital:70512
- Description: The 21st century has seen a dramatic increase in chronic non-infectious diseases, especially in the area of mental health. Medical anthropologists have seen a rise in the development of mental illnesses in both developed and developing nations. There is, however, little research conducted on trauma narratives that do not stem from political violence from an anthropological lens. South Africa has various understandings of trauma depending on the cultural context and it is crucial to examine these narratives as this provides vital information of the daily lived experiences of trauma survivors. Key themes draw on issues of trauma denialism, communicating distress, traumatic symptoms and the development of mental illnesses as a result of traumatic exposure. The data was analysed through Goffman’s (1959) Presentation of Self in Everyday Life illustrating various ways how survivors present themselves depending on the particular audience. This research employed both qualitative and quantitative research methods to gather a holistic understanding of trauma survivors. With the use of semi-structured interviews of Stressful Life Events Questionnaire coupled with observations of online support groups for trauma survivors, this research has provided rich ethnographic evidence of the impact that culture has on trauma narratives illustrating a clear normalcy of trauma present in South Africa. , Thesis (MSocSci) -- Faculty of Humanities, Anthropology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Naidoo, Rinisa
- Date: 2022-10-14
- Subjects: Psychic trauma , Anthropology , Mental health South Africa , Apartheid South Africa Personal narratives , Culture Psychological aspects
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/408641 , vital:70512
- Description: The 21st century has seen a dramatic increase in chronic non-infectious diseases, especially in the area of mental health. Medical anthropologists have seen a rise in the development of mental illnesses in both developed and developing nations. There is, however, little research conducted on trauma narratives that do not stem from political violence from an anthropological lens. South Africa has various understandings of trauma depending on the cultural context and it is crucial to examine these narratives as this provides vital information of the daily lived experiences of trauma survivors. Key themes draw on issues of trauma denialism, communicating distress, traumatic symptoms and the development of mental illnesses as a result of traumatic exposure. The data was analysed through Goffman’s (1959) Presentation of Self in Everyday Life illustrating various ways how survivors present themselves depending on the particular audience. This research employed both qualitative and quantitative research methods to gather a holistic understanding of trauma survivors. With the use of semi-structured interviews of Stressful Life Events Questionnaire coupled with observations of online support groups for trauma survivors, this research has provided rich ethnographic evidence of the impact that culture has on trauma narratives illustrating a clear normalcy of trauma present in South Africa. , Thesis (MSocSci) -- Faculty of Humanities, Anthropology, 2022
- Full Text:
- Date Issued: 2022-10-14
Mobilising indigenous technologies of making oshikundu and uumboloto to motivate and enable sense making of the topic carbon dioxide by grade 8 rural school learners
- Nandjedi, Fredinard Nghinaounditala
- Authors: Nandjedi, Fredinard Nghinaounditala
- Date: 2022-10-14
- Subjects: Science Study and teaching (Secondary) Social aspects Namibia , Culturally relevant pedagogy Namibia , Ethnoscience Namibia , Carbon dioxide
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/405357 , vital:70164
- Description: Poor performance in Science has been noted in most rural schools and this has become a concern to education planners and implementers. Part of the failure is said to be caused by inadequate school resources, under-preparedness of teachers to teach Science, poor command of the Language of Learning and Teaching, negative attitudes that are accompanied by lack of insights into the value of Science, low self-efficacy, and poor-quality environments for learning Science. In this regard, literature has revealed that many Science teachers in Namibia do not consider learners’ local indigenous knowledge (IK) also known as indigenous technology to mediate learning. Yet, it is a requirement of the Namibian Science curriculum. I assume that this could be due in part to the fact that the Science curriculum is not explicit on how IK should be integrated into Science teaching. It is against this backdrop that this study sought to explore the opportunities IK integration into Science may offer in mediating learning and sense-making on the topic of carbon dioxide (CO2). Learners’ indigenous technological practices of making oshikundu and uumboloto were used as vehicles of learning. This qualitative case study is underpinned by the interpretive and indigenous research paradigms. Within the indigenous research paradigm, I focused on the Ubuntu perspective. This study was conducted at a rural under-resourced school in the Ohangwena region in Namibia. Thirty Grade 8 learners, one science teacher and two expert community members were involved as participants. Data were gathered using focus group interviews (sharing circles), group activities, participatory observations, and journal reflections. Data interpretation and analysis were done using Vygotsky’s sociocultural theory and Ogunniyi’s contiguity argumentative theory. A thematic approach to data analysis was adopted. That is, an inductive approach was employed whereby sub-themes were identified, and thereafter common sub-themes were combined into themes. The findings of this study revealed that the process of making oshikundu and uumboloto can be used to enable learners to make sense of the topic of CO2 and other related concepts. Furthermore, the study revealed that hands-on practical activities done with easily accessible resources which are related to learners’ indigenous technologies help learners learn Science easily. The study thus recommends that educators should use oshikundu and/or uumboloto to mediate learning of topics such as CO2. Science teachers should always try to tap into learners’ socio-cultural backgrounds in their lessons to enhance better understanding of Science concepts. , Thesis (MEd) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nandjedi, Fredinard Nghinaounditala
- Date: 2022-10-14
- Subjects: Science Study and teaching (Secondary) Social aspects Namibia , Culturally relevant pedagogy Namibia , Ethnoscience Namibia , Carbon dioxide
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/405357 , vital:70164
- Description: Poor performance in Science has been noted in most rural schools and this has become a concern to education planners and implementers. Part of the failure is said to be caused by inadequate school resources, under-preparedness of teachers to teach Science, poor command of the Language of Learning and Teaching, negative attitudes that are accompanied by lack of insights into the value of Science, low self-efficacy, and poor-quality environments for learning Science. In this regard, literature has revealed that many Science teachers in Namibia do not consider learners’ local indigenous knowledge (IK) also known as indigenous technology to mediate learning. Yet, it is a requirement of the Namibian Science curriculum. I assume that this could be due in part to the fact that the Science curriculum is not explicit on how IK should be integrated into Science teaching. It is against this backdrop that this study sought to explore the opportunities IK integration into Science may offer in mediating learning and sense-making on the topic of carbon dioxide (CO2). Learners’ indigenous technological practices of making oshikundu and uumboloto were used as vehicles of learning. This qualitative case study is underpinned by the interpretive and indigenous research paradigms. Within the indigenous research paradigm, I focused on the Ubuntu perspective. This study was conducted at a rural under-resourced school in the Ohangwena region in Namibia. Thirty Grade 8 learners, one science teacher and two expert community members were involved as participants. Data were gathered using focus group interviews (sharing circles), group activities, participatory observations, and journal reflections. Data interpretation and analysis were done using Vygotsky’s sociocultural theory and Ogunniyi’s contiguity argumentative theory. A thematic approach to data analysis was adopted. That is, an inductive approach was employed whereby sub-themes were identified, and thereafter common sub-themes were combined into themes. The findings of this study revealed that the process of making oshikundu and uumboloto can be used to enable learners to make sense of the topic of CO2 and other related concepts. Furthermore, the study revealed that hands-on practical activities done with easily accessible resources which are related to learners’ indigenous technologies help learners learn Science easily. The study thus recommends that educators should use oshikundu and/or uumboloto to mediate learning of topics such as CO2. Science teachers should always try to tap into learners’ socio-cultural backgrounds in their lessons to enhance better understanding of Science concepts. , Thesis (MEd) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-10-14
The nexus between territorial border controls, informal cross border trading and economic security in Zimbabwe: the case of Beitbridge Border Post
- Authors: Nare, Hilary
- Date: 2022-10-14
- Subjects: Informal sector (Economics) Zimbabwe , South Africa Commerce Zimbabwe , Border security Zimbabwe , Economic security Zimbabwe , Beitbridge (Zimbabwe) , Zimbabwe Politics and government , Zimbabwe Economic conditions
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365977 , vital:65807 , DOI https://doi.org/10.21504/10962/365977
- Description: Informal cross border trade is central to the lives of many Zimbabweans, with informal trade across the Zimbabwean-South African border being of particular importance. This entails travelling through the Beitbridge border post on the Zimbabwean side, with Zimbabwean informal traders purchasing items in South Africa for resale in Zimbabwe. In doing so, they contribute not only to their own economic security but likely to the economic security of other Zimbabweans deeply affected by the ongoing crisis in the country. Often times, when examining the lives of Zimbabwe’s informal traders, the border post is not subjected to sustained focus and analysis. Yet, border posts (like the Beitbridge border post) are complex social institutions which configure the lives and livelihoods of cross border traders in multiple ways, and which informal traders often have to negotiate their way through. In this context, this thesis provides a critical analysis of border control management at the Beitbridge border post with particular reference to the activities of Zimbabwean informal cross border traders. The Beitbridge border post, like all border posts, has multiple functions. As a territorial border post, it seeks to maintain the national sovereignty of the Zimbabwean nation- state, and it monitors and controls the movement of people and goods in both directions. Currently, it is doing so at a time when the vast majority of Zimbabweans are suffering from varying levels of economic insecurity. The extent to which these functions are performed, and the manner in which they are performed, depends fundamentally on what takes place at the Beitbridge border post. This refers to the performance of both human subjects (border control officers of various kinds) and inanimate objects (such as scanners and cameras), both of which enact agency. Combined with these is the agency of cross border traders, who are compelled to navigate their way in and through these dimensions of the border control system. The thesis examines this by drawing heavily upon Actor-Network Theory. It is based on research undertaken at Beitbridge border post, involving 50 interviews with primarily current and former border control officers as well as informal cross border traders. Findings of this study show that deficiencies in border control management and border porosity at Beitbridge have led to a flourishing of informal cross border trade and, in turn, contributed to economic security in Zimbabwe, including during the time of Covid-19. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nare, Hilary
- Date: 2022-10-14
- Subjects: Informal sector (Economics) Zimbabwe , South Africa Commerce Zimbabwe , Border security Zimbabwe , Economic security Zimbabwe , Beitbridge (Zimbabwe) , Zimbabwe Politics and government , Zimbabwe Economic conditions
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365977 , vital:65807 , DOI https://doi.org/10.21504/10962/365977
- Description: Informal cross border trade is central to the lives of many Zimbabweans, with informal trade across the Zimbabwean-South African border being of particular importance. This entails travelling through the Beitbridge border post on the Zimbabwean side, with Zimbabwean informal traders purchasing items in South Africa for resale in Zimbabwe. In doing so, they contribute not only to their own economic security but likely to the economic security of other Zimbabweans deeply affected by the ongoing crisis in the country. Often times, when examining the lives of Zimbabwe’s informal traders, the border post is not subjected to sustained focus and analysis. Yet, border posts (like the Beitbridge border post) are complex social institutions which configure the lives and livelihoods of cross border traders in multiple ways, and which informal traders often have to negotiate their way through. In this context, this thesis provides a critical analysis of border control management at the Beitbridge border post with particular reference to the activities of Zimbabwean informal cross border traders. The Beitbridge border post, like all border posts, has multiple functions. As a territorial border post, it seeks to maintain the national sovereignty of the Zimbabwean nation- state, and it monitors and controls the movement of people and goods in both directions. Currently, it is doing so at a time when the vast majority of Zimbabweans are suffering from varying levels of economic insecurity. The extent to which these functions are performed, and the manner in which they are performed, depends fundamentally on what takes place at the Beitbridge border post. This refers to the performance of both human subjects (border control officers of various kinds) and inanimate objects (such as scanners and cameras), both of which enact agency. Combined with these is the agency of cross border traders, who are compelled to navigate their way in and through these dimensions of the border control system. The thesis examines this by drawing heavily upon Actor-Network Theory. It is based on research undertaken at Beitbridge border post, involving 50 interviews with primarily current and former border control officers as well as informal cross border traders. Findings of this study show that deficiencies in border control management and border porosity at Beitbridge have led to a flourishing of informal cross border trade and, in turn, contributed to economic security in Zimbabwe, including during the time of Covid-19. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
Molecular identification of potential ciprofloxacin degrading bacteria and determination of its possible breakdown intermediates in rivers, Eastern Cape
- Authors: Ncgauzele, Zenande Rose
- Date: 2022-10-14
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/403003 , vital:69913
- Description: Thesis embargoed. To be released early 2026. , Thesis (MSc) -- Faculty of Pharmacy, Pharmacy, 2023
- Full Text:
- Date Issued: 2022-10-14
- Authors: Ncgauzele, Zenande Rose
- Date: 2022-10-14
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/403003 , vital:69913
- Description: Thesis embargoed. To be released early 2026. , Thesis (MSc) -- Faculty of Pharmacy, Pharmacy, 2023
- Full Text:
- Date Issued: 2022-10-14
Land degradation and livelihood strategies in rural Zimbabwe: the case of two A1 farms in Shurugwi District
- Authors: Nciizah, Tendai
- Date: 2022-10-14
- Subjects: Land degradation Zimbabwe , Sustainable livelihood , Shurugwi District , Conservation of natural resources Zimbabwe , Land reform Zimbabwe
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365989 , vital:65808 , https://doi.org/10.21504/10962/365989
- Description: Land degradation is a global phenomenon which is having serious negative consequences for rural livelihoods, which depend quite fundamentally on land and its resources. At the same time, one of the key conditions contributing to land degradation relates to rural livelihood practices, insofar as these practices fail to protect the land. Hence, there sometimes exists a mutually-reinforcing process of decline, in relation to both land vitality and livelihoods vitality over time. This thesis seeks to investigate and understand this complex land-livelihoods process through a case study of two fast track farms in the Shurugwi District of contemporary Zimbabwe. In the year 2000, the Zimbabwean government introduced the fast track land reform programme which fundamentally reconfigured the rural landscape. In particular, it led to the formation of A1 farms (containing small-scale farming units called A1 plots), onto which people were resettled for purposes of enhancing their livelihoods. The case study focuses on two A1 farms in the district, namely, Selukwe Peak and Adare farms. Through a longitudinal study of land and livelihoods on these A1 farms, this study seeks to identify the multi-faceted character of land degradation on the farms, the multi-layered conditions (or causes) facilitating land degradation (specifically, the farm-based livelihood practices) and the effects of this land degradation on these very livelihood practices. This includes a focus on farmers’ understandings of land degradation and how these understandings may or may not condition livelihood practices on the two farms. Of particular importance is the presence of not only agricultural practices, but also high levels of illegal and legal mining on the farms and in the surrounding areas. In pursuing this study, the thesis draws upon the Sustainable Livelihoods Approach alongside Margaret Archer’s morphogenetic sociological perspective. Combined, they provide an intricate understanding of the relevance of both structure and agency to the analysis. A qualitative methodology was used, and this involved a questionnaire survey, in- depth interviews, life histories, focus group discussions and transect walks. The study concludes that the livelihood strategies undertaken by the villagers of Selukwe Peak and Adare farms are key causes of land degradation, as are the land-degrading activities of illegal and legal miners. The A1 villagers are aware that their activities are causing land degradation but they continue these activities because they are pushed by circumstances beyond their control. Hence, both proximate and underlying causes are of some significance in understanding land degradation and livelihoods on the two farms, and their interrelationships. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nciizah, Tendai
- Date: 2022-10-14
- Subjects: Land degradation Zimbabwe , Sustainable livelihood , Shurugwi District , Conservation of natural resources Zimbabwe , Land reform Zimbabwe
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365989 , vital:65808 , https://doi.org/10.21504/10962/365989
- Description: Land degradation is a global phenomenon which is having serious negative consequences for rural livelihoods, which depend quite fundamentally on land and its resources. At the same time, one of the key conditions contributing to land degradation relates to rural livelihood practices, insofar as these practices fail to protect the land. Hence, there sometimes exists a mutually-reinforcing process of decline, in relation to both land vitality and livelihoods vitality over time. This thesis seeks to investigate and understand this complex land-livelihoods process through a case study of two fast track farms in the Shurugwi District of contemporary Zimbabwe. In the year 2000, the Zimbabwean government introduced the fast track land reform programme which fundamentally reconfigured the rural landscape. In particular, it led to the formation of A1 farms (containing small-scale farming units called A1 plots), onto which people were resettled for purposes of enhancing their livelihoods. The case study focuses on two A1 farms in the district, namely, Selukwe Peak and Adare farms. Through a longitudinal study of land and livelihoods on these A1 farms, this study seeks to identify the multi-faceted character of land degradation on the farms, the multi-layered conditions (or causes) facilitating land degradation (specifically, the farm-based livelihood practices) and the effects of this land degradation on these very livelihood practices. This includes a focus on farmers’ understandings of land degradation and how these understandings may or may not condition livelihood practices on the two farms. Of particular importance is the presence of not only agricultural practices, but also high levels of illegal and legal mining on the farms and in the surrounding areas. In pursuing this study, the thesis draws upon the Sustainable Livelihoods Approach alongside Margaret Archer’s morphogenetic sociological perspective. Combined, they provide an intricate understanding of the relevance of both structure and agency to the analysis. A qualitative methodology was used, and this involved a questionnaire survey, in- depth interviews, life histories, focus group discussions and transect walks. The study concludes that the livelihood strategies undertaken by the villagers of Selukwe Peak and Adare farms are key causes of land degradation, as are the land-degrading activities of illegal and legal miners. The A1 villagers are aware that their activities are causing land degradation but they continue these activities because they are pushed by circumstances beyond their control. Hence, both proximate and underlying causes are of some significance in understanding land degradation and livelihoods on the two farms, and their interrelationships. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
Understanding resource partitioning in three species of Gobiidae living in the warm-temperate Sundays Estuary
- Authors: Ndaleni, Phumza Malibongwe
- Date: 2022-10-14
- Subjects: Gobiidae South Africa Sundays Estuary (Eastern Cape) , Gobiidae Reproduction , Gobiidae Food , Gobiidae Geographical distribution , Gobiidae Morphology , Resource partitioning (Ecology)
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365655 , vital:65773 , DOI https://doi.org/10.21504/10962/365655
- Description: Estuaries represent a transition zone where saline water combines with freshwater, and this results in temporal and spatial variability in both biotic and abiotic parameters. Because the environmental gradient changes so rapidly in areas and the estuarine environment is harsh, fish need to either be able to specialise to one particular suite of abiotic contexts or have the physiological mechanisms to allow them to move throughout the gradient of the estuary. Apart from this, other factors such as climate change, habitat degradation, over exploitation of resources and the introduction of alien species also negatively influence fish species living in estuaries. These anthropogenic stressors can cause species exclusion in areas which were previously suitable for species with particular suites of traits. Measuring resource partitioning within functional groups not only helps in determining the functional structure of communities but also explains how organisms use resources in a community. Resource partitioning studies provide a useful conceptual framework to understand species interactions in a community and identify major resource dimensions along which species segregate. This study aimed to describe resource partitioning among the Gobiidae species, as the family is well represented in South African estuaries (24 species), is highly abundant and has several species which co-exist in individual estuaries. To accomplish this, different forms of resource partitioning that promote the coexistence of the three most abundant species found in warm-temperate South African estuaries; the Knysna sand goby Psammogobius knysnaensis (Smith, 1935), Prison goby Caffrogobius gilchristi (Boulenger, 1898) and River goby Glossogobius callidus (Smith, 1937) were investigated in the Sundays Estuary. This was accomplished by determining the reproductive biology, interspecific differences in feeding morphology, feeding ecology and habitat partitioning among the three species. The distribution and abundance of potential prey in the estuary (mesozooplankton and macrozoobenthic communities) were investigated, with both mesozooplankton and macrozoobenthic communities grouping into three distinct communities along the environmental gradient. Feeding morphological traits responsible for prey location, chasing, capture, mastication, ingestion and digestion were investigated. Little morphological overlap was observed between P. knysnaensis and C. gilchristi, indicating little dietary overlap between these two species. In contrast, the feeding morphology of Glossogobius callidus overlapped with both P. knysnaensis and C. gilchristi, indicating the potential to compete with both species for food. The trophic ecology of the three species was investigated using stomach content analysis, whereby prey abundance, frequency of occurrence and percentage of volume were determined. For P. knysnaensis, the incorporation of cyclopoids and ostracods decreased with fish size and that of bivalves and amphipods increased. Caffrogobius gilchristi was found to be a specialist feeder on cyclopoids but as the species increased in size the incorporation of amphipods, mysids, brachyurans and gastropods increased. Glossogobius callidus was found to be a generalist feeder, feeding on cyclopoids, amphipods and chironomids. The incorporation of cyclopoids decreased with fish size and the consumption of large sized amphipods and chironomids increased with fish size. To assess their reproductive biology, gonadosomatic index (GSI) was used to study the breeding season. In all three species, reproduction peaked in spring and summer, and this is associated with peak phytoplankton and zooplankton biomass in estuaries. Length at 50% maturity and fecundity were also determined. The three species predominated in different locations in the estuary, which explains why they were able to use similar resources and reproduce at the same time. Psammogobius knysnaensis was abundant in the sandy mouth region, with sediment type and prey (bivalves and mysids) availability affecting its distribution. Caffrogobius gilchristi was abundant in the muddy lower reaches of the estuary, with its distribution influenced by sediment composition and temperature. Glossogobius callidus was abundant in the turbid upper reaches, with its distribution influenced by prey (amphipods) availability and turbidity. Different habitat preferences and diet among the specific size ranges enabled coexistence among the species. This explains the high abundances and coexistence of gobies in South African estuaries. , Thesis (PhD) -- Faculty of Science, Ichthyology and Fisheries Science, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Ndaleni, Phumza Malibongwe
- Date: 2022-10-14
- Subjects: Gobiidae South Africa Sundays Estuary (Eastern Cape) , Gobiidae Reproduction , Gobiidae Food , Gobiidae Geographical distribution , Gobiidae Morphology , Resource partitioning (Ecology)
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365655 , vital:65773 , DOI https://doi.org/10.21504/10962/365655
- Description: Estuaries represent a transition zone where saline water combines with freshwater, and this results in temporal and spatial variability in both biotic and abiotic parameters. Because the environmental gradient changes so rapidly in areas and the estuarine environment is harsh, fish need to either be able to specialise to one particular suite of abiotic contexts or have the physiological mechanisms to allow them to move throughout the gradient of the estuary. Apart from this, other factors such as climate change, habitat degradation, over exploitation of resources and the introduction of alien species also negatively influence fish species living in estuaries. These anthropogenic stressors can cause species exclusion in areas which were previously suitable for species with particular suites of traits. Measuring resource partitioning within functional groups not only helps in determining the functional structure of communities but also explains how organisms use resources in a community. Resource partitioning studies provide a useful conceptual framework to understand species interactions in a community and identify major resource dimensions along which species segregate. This study aimed to describe resource partitioning among the Gobiidae species, as the family is well represented in South African estuaries (24 species), is highly abundant and has several species which co-exist in individual estuaries. To accomplish this, different forms of resource partitioning that promote the coexistence of the three most abundant species found in warm-temperate South African estuaries; the Knysna sand goby Psammogobius knysnaensis (Smith, 1935), Prison goby Caffrogobius gilchristi (Boulenger, 1898) and River goby Glossogobius callidus (Smith, 1937) were investigated in the Sundays Estuary. This was accomplished by determining the reproductive biology, interspecific differences in feeding morphology, feeding ecology and habitat partitioning among the three species. The distribution and abundance of potential prey in the estuary (mesozooplankton and macrozoobenthic communities) were investigated, with both mesozooplankton and macrozoobenthic communities grouping into three distinct communities along the environmental gradient. Feeding morphological traits responsible for prey location, chasing, capture, mastication, ingestion and digestion were investigated. Little morphological overlap was observed between P. knysnaensis and C. gilchristi, indicating little dietary overlap between these two species. In contrast, the feeding morphology of Glossogobius callidus overlapped with both P. knysnaensis and C. gilchristi, indicating the potential to compete with both species for food. The trophic ecology of the three species was investigated using stomach content analysis, whereby prey abundance, frequency of occurrence and percentage of volume were determined. For P. knysnaensis, the incorporation of cyclopoids and ostracods decreased with fish size and that of bivalves and amphipods increased. Caffrogobius gilchristi was found to be a specialist feeder on cyclopoids but as the species increased in size the incorporation of amphipods, mysids, brachyurans and gastropods increased. Glossogobius callidus was found to be a generalist feeder, feeding on cyclopoids, amphipods and chironomids. The incorporation of cyclopoids decreased with fish size and the consumption of large sized amphipods and chironomids increased with fish size. To assess their reproductive biology, gonadosomatic index (GSI) was used to study the breeding season. In all three species, reproduction peaked in spring and summer, and this is associated with peak phytoplankton and zooplankton biomass in estuaries. Length at 50% maturity and fecundity were also determined. The three species predominated in different locations in the estuary, which explains why they were able to use similar resources and reproduce at the same time. Psammogobius knysnaensis was abundant in the sandy mouth region, with sediment type and prey (bivalves and mysids) availability affecting its distribution. Caffrogobius gilchristi was abundant in the muddy lower reaches of the estuary, with its distribution influenced by sediment composition and temperature. Glossogobius callidus was abundant in the turbid upper reaches, with its distribution influenced by prey (amphipods) availability and turbidity. Different habitat preferences and diet among the specific size ranges enabled coexistence among the species. This explains the high abundances and coexistence of gobies in South African estuaries. , Thesis (PhD) -- Faculty of Science, Ichthyology and Fisheries Science, 2022
- Full Text:
- Date Issued: 2022-10-14