List of Titles

The relationship between human, social and financial capital and small and medium enterprise (SME) performance in South Africa

Authors: Siso, Masiso Nomakha
Date: 2024-10-11
Subjects: Small business South Africa , Small and medium enterprises , Enterprise performance management , Financial literacy , Human capital , Social capital (Sociology) , Financial capital , Resource-based view
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/462823 , vital:76338
Description: The COVID-19 pandemic has had a severe impact on developing countries, exacerbating economic stagnation, high poverty rates, and unemployment. South Africa, in particular, faces significant challenges, with a 35.3 percent unemployment rate and a 17.4 percent GDP decline in 2021. Small and Medium Enterprises (SMEs) are crucial during these economic challenges, traditionally employing a substantial workforce and contributing significantly to the GDP. Despite their importance, SMEs often struggle, with a small percentage surviving the initial two years. Limited research has been conducted on the resources and capabilities crucial for enterprise performance in South Africa. While studies in developed countries exist, few explore the relationship between resources and capabilities facilitating SME performance in developing contexts. This study focuses on human capital, bonding, bridging, and linking social capital, and financial capital as key resources and capabilities. Given the backdrop that many entrepreneurs in South Africa may not possess formal education or extensive work experience, this study contends that financial literacy—encompassing financial knowledge, behaviour, and attitude—serves as a proxy for human capital. Additionally, a notable portion of entrepreneurs in South Africa face a deficit in the skills and knowledge essential for identifying entrepreneurial opportunities. Even among those possessing these capabilities, the challenge lies in the lack of necessary resources, including social and financial capital, to effectively transform such prospects into viable new ventures. This study employed a causal research design and adopted a quantitative research approach within a post-positivist paradigm. The primary objective was to investigate the relationship between the following independent variables; human (where financial literacy was used as a proxy which consisted of financial knowledge, attitude and behaviour), bonding, bridging and linking social capital, and financial capital and the dependent variable; SME performance. An online self-administered questionnaire was used to gather data from SME owners/managers. A pilot study was undertaken, in which an electronic link to the questionnaire was sent to potential respondents. Potential respondents were identified using purposive and convenience sampling methods. Data collection yielded 334 usable responses from SME owners/managers in South Africa. After cleaning the data, the analysis examined the relationship between independent and dependent variables. Confirmatory Factor Analysis (CFA) and Cronbach Alpha Coefficient analysis were used to confirm the validity and reliability of the measurement instrument, respectively. Descriptive statistics, regression, and correlation results were reported. Furthermore, a group mean analysis, including independent sample t-tests and one-way ANOVAs, were performed to investigate potential significant differences in variables based on demographic and enterprise related variables. The findings revealed a significant positive relationship between financial capital and SME performance. This indicates that an entrepreneur's ability to access financial capital or possess financial capital contributes to the performance and success of enterprises in South Africa. This finding underscores the crucial role of financial capital in facilitating the growth and sustainability of enterprises, as it provides a buffer against unfavourable economic shocks, enables entrepreneurs to pursue more capital-intensive strategies, and affords them more time to learn and overcome challenges. Conversely, no significant relationships were found between financial knowledge, behaviour, and attitude, bonding, bridging, and linking social capital, and SME performance. This study contributes to the development of SMEs in South Africa by identifying the critical resources and capabilities essential for their survival and growth. Additionally, it offers valuable recommendations for policymakers to create a conducive environment for entrepreneurs and suggests potential educational initiatives and support structures. Furthermore, this study advocates for the exploration of innovative financing approaches to build a financial cushion and bolster resilience against economic upheavals. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
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Date Issued: 2024-10-11

The relationship between REITS and stock market prices during periods of volatility: a Bivariate GARCH analysis

Authors: Makara, Ntsali Audrey
Date: 2024-10-11
Subjects: Real estate investment trusts South Africa , Stocks Prices , Stock exchanges South Africa , GARCH model , Volatility
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/462768 , vital:76333
Description: The relationship between real estate and the stock market is essential because they are the two most highly invested assets. In addition, examining the volatility of any asset is important for risk management and investor portfolio returns. The general motivation for analysing the relationship is that it can provide insight to policymakers and investors about the behaviour of stocks and real estate assets. The purpose of this research is to examine the relationship between Real Estate Investment Trusts (REITS) and stock prices in South Africa using daily data from 2 January 2013 to 31 May 2023. The wealth and credit effects are the two mechanisms used to interpret the relationship. The wealth effect is a mechanism that states that the causal relationship between the two markets runs from increasing stock prices which tends to increase real estate. The credit effect claims that real estate prices influence stock prices. Most of the existing literature has examined the relationship between the two markets but less attention has been given to the volatility spillover effects. Therefore, the analysis presented in this thesis extends the existing research by examining the relationship and the spillover effects between the REITs and stock markets. The study employs quantitative research methodology using the following econometric methods i)Vector Autoregression model, ii) Granger Causality Tests and Bivariate GARCH models. The study found that there is no long-run relationship between REITS and stock prices. In addition, the Granger Causality results showed a unidirectional relationship between REITs and stock prices. The results indicate the presence of a wealth effect in South Africa, meaning that changes in stock prices influence the real estate market. Moreover, the GARCH analysis found volatility spillover effects from the stock to the REITs markets. These results are helpful for policymakers and investors interested in the portfolio and risk management of the two markets. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
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Date Issued: 2024-10-11

The reproductive biology of warty sea cucumber, Neostichopus grammatus Clark (Holothuroidea: Echinodermata) under natural and integrated multi-trophic aquaculture (IMTA) conditions in the Eastern Cape Province, South Africa

Authors: Senekal, Heleen Ester
Date: 2024-10-11
Subjects: Sea cucumbers South Africa Eastern Cape , Sea cucumbers Reproduction , Gonads , Gonadosomatic Index , Integrated aquaculture , Abalone culture , Sea cucumbers Effect of temperature on , Marine sediments
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/464451 , vital:76512
Description: This study investigated the reproductive cycle of the warty sea cucumber, Neostichopus grammatus, in the wild and in a farming environment, to test its suitability for co-culture with abalone Haliotis midae in an IMTA system. The research formed part of a broader EU H2020 program, Aquavitae, and was conducted at Wild Coast Abalone in South Africa. The study investigated several environmental parameters, such as temperature, day length, and substrate, to determine if these have any effects on the gonadal development and reproductive cycle. The natural gametogenic cycle of wild warty sea cucumbers was determined by monitoring the Gonadosomatic Index (GI) values monthly for a period of 16 months. The GI index was validated by means of other maturity assessment techniques including measurement of the size and colour of the gonads, oocyte diameter measurements and gonad histology sections. Wild collected sea cucumbers were maintained in abalone farm rearing tanks on a diet of abalone feed and faecal waste for a period of 10 months, with GI values being determined monthly. The wild and farmed sea cucumber GI data was correlated with environmental parameters. Seasonal water temperature was strongly correlated with the GI values of wild warty sea cucumbers, suggesting that water temperature likely influences gonadal development. Sea cucumbers matured sexually during colder months (May to September) and spawned from September to February, during summer. The results of oocyte measurements, macroscopic and microscopic analyses, and histological analyses in combination with the GI values, provides a practical indicator of sexual maturity for captive breeding purposes. Farmed warty sea cucumbers followed the same annual reproductive cycle as wild sea cucumbers, however they came into spawning condition approximately one month later than wild conspecifics. As the farm water temperature was significantly higher than the ambient ocean water temperature, it was hypothesised that this may have affected the gonadal development of the farmed sea cucumbers. Furthermore, the farm-reared sea cucumbers lost weight and condition, indicating a nutritional deficiency. Previous studies indicated that the presence of a sand sediment facilitated the assimilation of organic detrital matter by sea cucumbers. An additional trial was thus set up to determine the effect of a sand sediment and cooler ambient temperature on the growth and gonadal development of the warty sea cucumbers. The growth and GI values of sea cucumbers in the cool water treatment did not differ significantly from the ambient temperature control groups. However, the addition of a sand substrate to the sea cucumber tanks had a significant positive growth effect on sea cucumber body mass and GI values. Sea cucumbers fed a diet of abalone waste material on the sand substrate exhibited final average GI values of 2.99 % (SE ±0.56). In contrast, sea cucumbers kept in bare tanks and only received abalone waste as food had significantly lower average GI values of 1.36 % (SE±0.2). This suggests that the provision of a sand sustrate in sea cucumber rearing containers is essential for the adequate nutrition and gonadal development. The results of this study indicate that the warty sea cucumber is a promising candidate for inlcusion in an IMTA system with South African perlemoen abalone. , Thesis (MSc) -- Faculty of Science, Ichthyology and Fisheries Science, 2024
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Date Issued: 2024-10-11

The role of academic literacy courses in students’ disciplinary knowledge-building: a case study of a Namibian university

Authors: Nekondo, Linus Vaakohambo
Date: 2024-10-11
Subjects: Information literacy , Communication in learning and scholarship , Decolonization Namibia , Globalization , Education and globalization Namibia , Academic English , Academic language
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/466383 , vital:76723 , DOI https://doi.org/10.21504/10962/466383
Description: This doctoral study investigated the role of academic literacy courses in shaping students’ disciplinary knowledge within the context of a Namibian university. Motivated by concerns surrounding persistently high attrition rates in higher education institutions globally, the research challenges the prevailing tendency to attribute poor student performance solely to individual factors, thus neglecting systemic issues whereby the higher education sector is absolved of responsibility. This absolution is often on the premise that the university has provided adequate support, such as through academic literacy courses, to equip students for success. However, despite the provision of such courses, high attrition rates persist. The study was guided by the following questions: 1. How is ‘academic literacy’ conceptualised in the UNAM English for Academic Purposes course curriculum? This question is further divided into two sub-questions: (a) How do the academics who teach the UNAM EAP course conceptualise ‘academic literacy’? and (b) How is knowledge structured in course documents and assessments? 2. How do academics who teach other courses conceptualise UNAM's EAP course and its relationship to the literacy practices expected in their courses? 3. How do students experience the EAP course at UNAM, and how do they understand the relationship between the content and activities of the EAP course and the academic literacy demands of their other courses? Data collection involved individual interviews with both English for Academic Purposes (EAP) lecturers and discipline-specific lecturers across three UNAM campuses, the Faculty of Education, Faculty of Engineering and Faculty of Health Sciences. Additionally, focus group interviews were conducted with students from these same campuses. To ensure robustness, triangulation of interview data was achieved by complementing it with document analysis of EAP course materials and mainstream course documents. The goal was to identify instances of code-matches (where academic literacy practices align with the expectations of the disciplines) or code-clashes (where discrepancies emerge). The findings illuminated prevailing perceptions of academic literacy as a set of skills encompassing reading, writing, and related competencies. Implicit in this understanding was that these presumed academic skills are universally applicable across academic contexts and can be taught with equal effectiveness to students regardless of their chosen discipline. An analysis using Legitimation Code Theory (LCT) revealed that such conceptualisation of academic literacy as practices that are neutral and generic across the academy indicates weaker epistemic relations (ER-), and weaker social relations (SR-). That is, the understanding of academic literacy that dominated in the data legitimated neither specialist knowledge nor any specific disposition in the knower. This results in what is known in LCT as a relativist code. Moreover, the study identified a distinct emphasis on generic, skill-based instruction in the EAP course documents. The relativist code identified in the analysis of the interviews with EAP lecturers, and echoing concerns raised in academic literacy literature about add-on courses, was starkly evident in the EAP course content. A code-clash emerged between the skills and genres taught in the EAP course and those required for success in mainstream courses. Three focus areas of the EAP course, essay writing, report writing, and referencing, were analysed in some depth to ascertain the nature of the code-clash. The thesis presents a comprehensive examination of a specific course and its reflection of prevalent generic common-sense approaches observed in various contexts. While the study centred on UNAM's EAP course, its aim was not to critique a particular course or colleagues. Rather, many findings resonate with issues identified in academic literacy research globally, underscoring persistent challenges associated with generic approaches that often fall short of enhancing epistemic access. The study concludes that there is an urgent need to assess the efficacy of academic literacy courses in fostering students’ disciplinary knowledge-building at grassroot level i.e. at the level of HEIs or disciplines. Such an assessment should consider not only the complexities of acquisition of academic literacy but also the broader global elements with transboundary influences, such as neoliberalism, massification, and the globalisation of higher education. This comprehensive examination contributes to ongoing discussions regarding the enabling of epistemic access and epistemic justice within higher education contexts. , Thesis (PhD) -- Faculty of Education, Centre for Higher Education Research, Teaching and Learning, 2024
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Date Issued: 2024-10-11

The role of students in internal quality assurance: a case study of Namibian institutions of higher education

Authors: Nghikembua, Anneli Ndapanda
Date: 2024-10-11
Subjects: Quality assurance , Education, Higher Evaluation , Universities and colleges Accreditation Namibia , Universities and colleges Auditing , Student participation in administration
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/466395 , vital:76724 , DOI htps://doi.org/10.21504/10962/466395
Description: The interplay of the mechanisms such as globalisation, massification and internationalisation led to higher education systems across the world introducing quality assurance. As systems have massified, student bodies have diversified with the result that the quality of teaching and learning has become increasingly important and has drawn the attention of policy makers and researchers. The Namibian higher education system was no different in heeding the call to develop quality assurance systems. As this happened, calls to involve students in quality assurance because of their roles as “stakeholders” in higher education were also heeded, and in common with institutions in systems across the world, those in Namibia began to include students in governance and quality assurance. Research on student involvement in internal quality assurance with a focus on higher education institutions in Namibia is scarce. This study aims to fill this gap by examining the role of students as stakeholders in the quality of teaching and learning in higher education institutions in three Namibian institutions. Roy Bhaskar’s (1978; 1989) critical realism and Margaret Archer’s (1995; 1996; 2000) social realism were used to build a theoretical framework which allowed for the exploration of students’ involvement in the quality assurance of teaching and learning. Critical and social realism both draw on the idea of a “depth ontology” and acknowledge that what is available to researchers empirically is only part of reality. As a result, critical and social realist researchers aim to move from empirical data to explore a level of reality not directly accessible via the senses. In the study underpinning this thesis, this involved using inference to move from interview data and documents to explore a level of reality from which events and experiences of events (both accessible empirically) emerge. A case study approach was used involving a “cross case” analysis of the three institutions. Questions guiding the study aimed not only to explore ways in which students were, or were not involved, in assuring quality of their education, but also what constrained and enabled involvement. Ultimately the study focused on whether or not their engagement contributed to the enhancement of quality. As all the institutions in the study did allow students to be involved in quality assurance, the question was the extent to which this involvement was “meaningful” in the sense that it could lead to change. Insights derived from the study showed that although students were represented on various governance structures, their experiences were that their contributions to debates and the issues they raised were not heeded. Another significant way in which students were involved in quality assurance was through the provision of feedback on teaching and course design. The investigation showed that, although teaching and learning centres at the three institutions studied did use feedback from students to develop training programmes for academic teachers, feedback was mainly used for instrumental purposes such as personal promotion, an observation which raises questions about the extent to which its elicitation could lead to enhancement. The use of Archer’s social realism allowed for the identification of a number of constraints on the potential of student involvement to contribute to the enhancement of teaching and learning. One such constraint was the hierarchical nature of institutional organisations which led to student comments not always being treated seriously, sometimes because of perceptions of their “immaturity”. Another constraint was related to confused understandings of what constitutes “quality” in policy documents. The study recommends that policies and manuals on student involvement should be designed to provide guidance to staff and students on how they should be involved. There is also a need to train students on their involvement as well as interrogate the student involvement beliefs and practices. , Thesis (PhD) -- Faculty of Education, Centre for Higher Education Research, Teaching and Learning, 2024
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Date Issued: 2024-10-11

The spiritual space of Mubende Hill in Uganda: rethinking “awaka w’ensi aw’omweyimirize, Maama Nakayima” as a symbol of ritual and spiritual performance

Authors: Nalukenge, Claire
Date: 2024-10-11
Subjects: Mubende (Uganda) , Rites and ceremonies Uganda Mubende , Spiritual practice , Ritual objects and ceremonial , Ritual in art , Spirituality in art
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/467050 , vital:76810 , DOI https://doi.org/10.21504/10962/467050
Description: This doctoral dissertation in art history investigates the dynamic relationships between ritual objects, rituals, spiritual performances, and their representations in specific cultural contexts. The main research question is: How do the ritual objects at Mubende Hill shape and communicate the meanings of the rituals, considering their performative contexts and embodied interactions? This thesis examines the ritual objects at the spiritual space of Mubende Hill in Uganda, which have various meanings and associations for different groups of people. It critically analyses how related objects are interpreted and represented by select Ugandan contemporary artists, including the 2019 history students of Margaret Trowell of Industrial and Fine Arts and the Uganda Museum. The difference between the above components is that the spiritual space, the artists, and the students represent objects as animate, whereas the Museum represents objects as obsolete. The spiritual space of Mubende Hill is a living space where people engage with ritual objects such as calabashes, clay pots, bowls, milk containers, and coffee beans in performative ways. Some of these objects are placed in various partitions of the sacred Omweyimirize tree at the spiritual space, and the objects become efficacious when engaged with through spiritual and ritual performance. In contrast, the Uganda Museum exhibits objects as inanimate, static, and enclosed in glass compartments. As such, the objects are rendered inactive. I examine the way the museum exhibits, frames, and labels these objects, and how this shifts people’s relationships with ritual objects. In contrast, I also analyze how selected Ugandan contemporary artists and the 2019 history students represent similar objects through their artistic practices, thereby opening up the meaning of these objects. This thesis addresses the critical need for a comprehensive reading and representation of objects within their living social and cultural contexts, a focus often overshadowed by museums. In trying to grapple with questions of representations of objects, I employed qualitative research methodologies, including extensive fieldwork, analysis of primary and secondary sources, participant observation, interviews, and photographic documentation The primary information was gathered from individuals at the spiritual space of Mubende Hill, Uganda, specifically the ritual specialists and the Balyammere, select contemporary Ugandan artists, and final year 2019 art history students from the Makerere Art School and select individuals from the Uganda museum. By comparing objects within their original contexts to decontextualized objects in museums and artistic and scholarly representations of objects, I analyze various art historical approaches to objects that grapple with issues of object representation, functionality, purpose, performance, and the movement of objects. I utilize this analysis of objects to critique colonial and contemporary neo-colonial approaches to ritual objects and develop decolonial understandings of objects that are embedded in personal experiences, stories, and narratives of text accompanied with visuals from the Balyammere’s object-ritual and spiritual performances. The study argues that ritual objects possess active agency, extending beyond mere aesthetic appreciation, and they are intertwined within their performative spiritual and cultural contexts. Analyzing these objects and their roles in rituals and spiritual performances allows us to deeply comprehend their meanings and significances as embedded in cultural, spiritual, and social fabrics. The study emphasizes a need for art histories that prioritize African-based scholars at the forefront of knowledge production and appreciate diverse, non-Eurocentric perspectives, suggesting a multidisciplinary approach to understanding art. A deeper understanding of the relationship between objects, rituals, and spiritual performances cannot only expand the knowledge in art history but also suggest alternatives to conventional object perspectives and practices, arguing for a comprehensive, culturally sensitive, and inclusive approach to understanding objects and art within their performative contexts. , Thesis (PhD) -- Faculty of Humanities, Fine Art, 2024
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Date Issued: 2024-10-11

The stock market and the business cycle in South Africa

Authors: Pokoo, Patience
Date: 2024-10-11
Subjects: Stock exchanges South Africa , Economic activity , Business cycles South Africa , Autoregression (Statistics) , Policymaker , Johannesburg Stock Exchange
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/462801 , vital:76336
Description: The relationship between the stock market and economic activity has long been a topic for research. Several studies done in both advanced and emerging economies including South Africa before COVID-19 found stock market prices predict the cycle of real economic activity and some found it to be the reversal. Therefore, this Study seeks to examine this topic and will extend beyond the post-covid period exploring the relationship between the stock market (proxied by the JSE All-Share Index) and the business cycle (represented by the Coincident Business Cycle Indicator of the SARB) in South Africa. The study also investigates if the relationship between the stock market and the business cycle is homogenous across the three selected sectors of the JSE using a combination of the “financial accelerator theory”, the “wealth effect theory”, the “traditional valuation model of stock prices”, the “stock prices as aggregators of expectations”, and the “cost of raising equity capital”. The Econometrics models employed include time-series and panel cointegration techniques, relying on the ARDL estimation model and a Granger-Causality Test. The findings of this study indicate that a long-run relationship exists between the stock market and the business cycle in South Africa. The findings support the notion that the stock market predicts economic activity, and this relationship is assumed to be homogenous across the selected Sectors of the JSE (namely, Resources, Financials, and Industrials). Again, the Granger-Causality Test confirms the relationship between the stock market and the business cycle in South Africa to be unidirectional. It is recommended that since the stock market affects South African economic activity positively in the long run which is consistent with findings of similar studies done on the JSE, the South African Reserve Bank (SARB) must strengthen existing policy to ensure financial system stability and sustainable economic growth in South Africa. Again, the stock market being a leading indicator of the business cycle is something different. As a recommendation, we need to look at ways to use the prediction ability in a business setting. Investors and Portfolio Managers can follow trends of the stock market to forecast the direction of the future economy to make educated decisions to hedge their investments and diversify their portfolios against huge losses in crises such as the Financial Crises and the Global Health Crisis (COVID-19), however, with the caveat that the stock market does not always accurately predict the business cycle. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
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Date Issued: 2024-10-11

Togetherness, care and exclusion: adolescents’ experiences of living with a disabled sibling in a South African context

Authors: Foote, Tamlyn Lou-Ann
Date: 2024-10-11
Subjects: Siblings of people with disabilities South Africa , Interpretative phenomenological analysis , Sibilings Family relationships , Sibilings Psychological aspects , South Africa Social conditions
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/466995 , vital:76805 , DOI https://doi.org/10.21504/10962/466995
Description: The importance of the sibling relationship in an individual’s life has been established, and various aspects of siblingship have been studied. Recently researchers have begun to explore what it means to be a sibling and how siblingship is embodied. Where disability is present in the siblingship, however, there is very little literature, particularly in the Global South. This cross-cultural, cross-language, Interpretative Phenomenological study explores how isiXhosa speaking adolescent non-disabled people, living in a socio-economically disadvantaged context in South Africa, experience their lives in relation to their disabled sibling. Through the use of semi-structured interviews and photo-production with 9 isi-xhosa speaking adolescents from a disadvantaged socio-economic context in South Africa, three master themes emerged. Firstly, non-disabled siblings (NDSs) experienced togetherness in their relationships with their disabled brothers/sisters. In their experiences of togetherness, where reciprocity was prominent, they felt a sense of we-ness. In these instances, disability did not play a central role in their relationships. Secondly, NDSs living in disadvantaged socio-economic contexts experienced care in different ways. Some experienced wanting to care and some experienced having to care for their disabled brother or sister. Where care was voluntary it was experienced as an act of love, contributing to their self-esteem or a family value. Where care was experienced as obligatory, NDSs felt lonely and unsupported, and this contributed to ambivalent feelings toward their disabled sibling. Finally, NDSs experienced themselves as outsiders. Experiences of being an outsider sometimes occurred because of their socio-economic status, and sometimes because of experienced stigma related to their sibling’s disability. In both instances this contributed to feelings of inadequacy and exclusion. To overcome these feelings, NDSs focused on becoming successful, wealthy or famous. These findings have important implications in terms of how NDSs may be supported. Furthermore, this study has important methodological implications for using Interpretative Phenomenological Analysis in a cross-cultural, cross-language context. , Thesis (PhD) -- Faculty of Humanities, Psychology, 2024
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Date Issued: 2024-10-11

Towards a bacterial biofertiliser for the rehabilitation of disturbed and degraded land

Authors: Masudi, Wiya Leon
Date: 2024-10-11
Subjects: Biofertilizers , Land degradation , Ecological disturbances , Plant-growth promoting rhizobacteria , Restoration ecology
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/466826 , vital:76790 , DOI https://doi.org/10.21504/10962/466826
Description: Agriculture, mining, industry, and human activity disturb, degrade, and pollute pristine environments and particularly the soil environment. Excessive land exploitation slows or disrupts the soil potential, rendering it incapable of playing its role leading to land degradation. In the mining sector, specifically coal mining, rehabilitation of disturbed and degraded land involves strategies that include importing topsoil and using fossil fuel-derived fertilisers. Both practices are unsustainable. To address the unsustainability, a myco-phytoremediation technology known as Fungcoal was developed to facilitate successful revegetation of mining-disturbed and degraded land following the bioconversion of waste coal into a soil-like humic-rich substrate. To offset the dependence on chemical-based fertilisers, efforts were/are focussed on finding mutualistic and cost-effective microbial resources with plant growth-promoting (PGP) activity as a bacterial biofertiliser. This study made use of 22 isolated bacteria and the three Fungcoal coal-degrading fungi viz., Aspergillus sp. ECCN 84, Aspergillus sp. ECCN 225 and Penicillium sp. ECCN 243 as the microbial resource. Initially, characterisation of the substrate waste coal and molecular identification of the selected bacterial isolates were carried out. Physicochemical analysis of the low-rank coal (LRC) substrate revealed a pH of 3.60 with background S content equivalent to 7.13 g L-1, N at 20 mg L-1, P at 7.8 mg L-1 and K at 3.3 mg L-1. Energy-dispersive X-ray spectroscopy (EDX) analysis revealed a C and O content of 23.09 and 69.03 wt%, respectively. Metagenomic analysis of the microbial population associated with the LRC substrate showed that among the 96.32% of bacteria, 59.46 to 62.18% belonged to Bacillota (also called Firmicutes), a phylum of largely Gram-positive bacteria, and 33.01 to 35.74% to Pseudomonadota (synonymous with Proteobacteria), a phylum of mostly Gram-negative bacteria. Following purification of the selected bacterial isolates and molecular characterisation by PCR, phylogenetic relatedness to known plant growth-promoting bacteria (PGPB) contained in the GenBank database showed that these bacterial isolates clustered with high bootstrap values to the reference PGPB strains. Only Pseudomonas sp. ECCN 10b (MW672582) was outside of the tree and shared significant similarity (100%) with Pseudomonas fluorescens (CP015638). A biochemical study revealed that the two Proteus sp. strains, Exiguobacterium sp., Enterobacter sp., and Ancylobacter, tolerated high salt and a wide range of temperatures. Bacterial isolates showed a high pH tolerance between 3 and 11, with the best growth at pH around 7. Nine of the identified strains, four Bacillus sp., Exiguobacterium sp., Enterobacter sp., Pseudomonas sp., Arthrobacter sp., and Aeromonas sp., were able to grow and increase in a medium containing either glucose, mannitol, sodium L-glutamate, sucrose, or fructose. Growth was highest in media containing either sodium L-glutamate, sucrose, or fructose. All the coal degrading strains and 83% of those isolated from municipal wastewater used more complex carbon sources such as high and LRC. The potential for PGP activity was quantified spectrophotometrically by measuring the production of auxins, as indole-3-acetic acid (IAA) equivalents; gibberellins, as gibberellic acid (GA3) equivalents, along with 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and siderophore activity. Additionally, nutrient mobilisation was evaluated by monitoring an ability to mineralise NH4+, PO43−, and K+. Competent PGP strains for the coal degrading isolates included Proteus strain ECCN 20b, Proteus strain ECCN 23b, and Serratia strain ECCN 24b. In response to L-trp supplementation, the concentration of indolic compounds (measured as indole-3-acetic acid) increased. Production of ammonium and solubilisation of insoluble P by these strains was also apparent. Only Serratia strain ECCN 24b could solubilise insoluble K. Production of indoles increased following exposure to increasing aliquots of LRC, suggesting no negative effect of this material on indole production and that these bacteria may possess PGP potential. Of the twelve bacterial strains isolated from wastewater MaB-flocs, three produced indoles, nine mineralised NH4+, seven solubilised P, and one K. Potential of isolated strains for PGP activity according to a one-way ANOVA on ranks was: ECCN 7b > ECCN 4b > ECCN 6b > ECCN 3b = ECCN 10b > ECCN 1b = ECCN 5b > ECCN 8b > ECCN 2b > ECCN 12b > ECCN 9b = ECCN 11b. Further study revealed that cell-free filtrate from indole-producing cultures of Aeromonas strain ECCN 4b, Enterobacter strain ECCN 7b, and Arthrobacter strain ECCN 6b promoted mung bean adventitious root formation. Based on a biochemical study and the outcome of the ranking of bacterial strains according to PGP-like activities, three bacteria, Enterobacter sp., strain ECCN 7b, Proteus sp., strain ECCN 20b and Serratia sp., strain ECCN 24b that showed great mutualistic relationship with the most effective Fungcoal biocatalyst, A. fischeri ECCN 84, were used to prepare a bacterial bio-fertiliser. This consortium grew well in NB supplemented with L-tryptophan and produced indole compounds that could activate the adventitious rooting of mung bean (Vigna radiata L.) hypocotyls. Finally, the consortium showed no antibiotic resistance activity; however, they produced better biofertiliser with good responses to root/plant biomass production of the same Fabaceae, mung bean (Vigna radiata L.). The further development of this consortium into a cost-effective, environmentally friendly biofertiliser may help reduce dependence on chemical-based fertilisers and improve the sustainability of Fungcoal and other land rehabilitation strategies. Further studies are therefore underway to investigate in greater detail the PGP activity of these isolates individually and in consortium under field conditions to support the Fungcoal myco-phytoremediation strategy. , Thesis (PhD) -- Faculty of Science, Institute for Environmental Biotechnology, 2024
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Date Issued: 2024-10-11

Towards a valid Afrikaans-translation of the CASr-SF: a linguistic and cultural transfer

Authors: Steyn, Constanze
Date: 2024-10-11
Subjects: Intimate partner violence South Africa , Afrikaans language , Psychological tests Translating , Psychometrics , Victims of family violence Mental health
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/465854 , vital:76659
Description: Globally, and especially in South Africa, we face the reality of linguistic and cultural variation within one nation. Our nation is intricately woven from rich cultural and linguistic threads to create a complex tapestry. It is a beautiful privilege that is, however, not without its obstacles. We often do not have access to psychometric tools that “speak” the language of the respondent that we intend to assess. It is, and should, however, be, our goal to adapt and translate assessments to allow individuals to convey their experience in their language of comfort. This is crucial for psychological assessments' fairness, reliability, validity, and utility. Intimate partner violence (IPV) severely impacts mental health worldwide. An alarming correlation has been found between exposure to IPV and the development of mental health difficulties. In South Africa, IPV is considered a significant public health issue. Even though South Africa has a population of approximately 60,9 million, of whom an estimated 10.6% are Afrikaans-speaking, there is currently no measure exploring the experiences of IPV available in Afrikaans. Having psychological assessments available in Afrikaans is essential in evaluating the psychological experiences of people seeking mental health services in Afrikaans. The Composite Abuse Scale (Revised) – Short Form (CASr-SF) is a self-report questionnaire that measures experiences of IPV across three domains: physical, psychological, and sexual abuse. This study aimed to develop a meaningful and relevant Afrikaans translation of the CASr-SF to improve the linguistic accessibility of the measure and afford more ease to Afrikaans-speaking individuals in sharing experiences of abuse. This study followed a four-step translation design, including forward- and backtranslation, a committee approach, and qualitative piloting through cognitive interviews. Participants in this study included four independent translators who were approached by the researcher directly, according to their respective areas of expertise – linguistics and psychology. In addition, three participants were sourced from the target population through snowball sampling to partake in cognitive interviews as a confirmatory step and to potentially substantiate, expand on, and review results gathered during the first three steps of the translation design. The researcher ii compared, collated, and analysed the data to identify problematic items. The translation team then discussed these items to refine the translation, and items were corrected to develop the final translation of the Composite Abuse Scale (Revised) – Short Form in Afrikaans. The translation is now ready for quantitative piloting, which is currently underway to establish its psychometric properties. , Thesis (MA) -- Faculty of Humanities, Psychology, 2024
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Date Issued: 2024-10-11

Understanding heat energy conservation: using traditional brick making in a Grade 7 Natural Sciences class in a rural school

Authors: Godlo, Lindiwe Priscilla
Date: 2024-10-11
Subjects: Science Study and teaching (Primary) South Africa , Traditional ecological knowledge South Africa , Social learning South Africa , Ubuntu (Philosophy) , Heat storage , Brickmaking South Africa
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/463559 , vital:76420
Description: Learners seemed to experience cognitive dissonance on the topic of the conservation of heat energy. My assumption is that this might be due to cognitive dissonance or conflict that learners seem to experience in science classrooms. This means the way science teachers teach science does not form part of learners’ contexts and hence has no relevance to them. To ameliorate this dilemma, the South African Curriculum and Assessment Policy Statement (CAPS) document requires teachers to integrate indigenous knowledge into science teaching and learning but does not provide explicit methods on how to do it. It is against this backdrop that this study explored how the use of traditional brick making method can support learners to make sense of the topic of conservation of heat energy. Underpinned by the interpretivist and Indigenous research paradigms, a qualitative case study design was employed. Twenty-four Grade 7 Natural Sciences learners, four indigenous knowledge custodians (IKCs) (who were all women), and a critical friend participated in this study. Data sets were generated through several methods: learner group activity; participatory and lesson observations; a sharing circle; and learners’ reflective journals. Vygotsky’s Sociocultural Theory and Ogunniyi’s Contiguity Argumentative Theory were used as theoretical lenses to analyse data. The findings revealed that during the demonstration by the IKCs, learners were able to identify science concepts related to the conservation of heat energy which means they understood the science concept. Learners’ argumentation and sense-making of the aforementioned topic and related concepts greatly improved. Based on the research findings, I thus recommend that teachers should tap into IKCs’ cultural heritage to contextualise and make science relevant and more meaningful to learners. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
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Date Issued: 2024-10-11

“I pulled it out”: a discursive exploration of narrated accounts on decision-making and power differentials in the prescription and use of long-acting reversible contraceptives

Authors: Ndabula, Yanela
Date: 2024-10-11
Subjects: Contraception Social aspects South Africa , Decision making , Long-acting reversible contraception , Reproductive rights South Africa , Control (Psychology) , Feminism
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/467017 , vital:76807 , DOI https://doi.org/10.21504/10962/467017
Description: Long-Acting Reversible Contraception (LARC), viz., intrauterine devices, subdermal implants, and injectable contraceptives, are highly effective, long-term birth control methods that limit user action. Alongside the decrease in fertility rates achieved through their mass provision has been their coerced or non-consented administration to marginalised women. These highly effective yet provider-controlled and thus imposable contraceptives have been associated with problematic classed, raced, ageist, and ableist promotions. A critical lens that inquires into their endorsement within clinical practice is thus necessary. The bulk of literature evidencing reproductive injustices in relation to fertility control through LARC technologies emanates from the US and UK contexts. Not much research on the South African context has explored how contraceptive decision-making within clinical interactions shapes LARC uptake despite usage increasing through the years. Using a poststructural, postcolonial feminist framework alongside a reproductive justice stance, this study explores health providers’ and contraceptive users’ narrations of the prescription and usage of LARC technologies alongside how such talk emplots women who use, continue, or discontinue using these contraceptive technologies. In addition, the power relations (re)produced in the participants’ talk that maintain or constrain coloniality and reproductive justice with implications for certain people’s reproductive choices/rights were explored. To do so, I used data from 72 semi-structured interviews with contraceptive users (51) and healthcare providers (21). A combination of stratified purposive, convenient, and snowball sampling was used to sample the providers and users of LARC recruited within a city, town, and village. To elicit stories about healthcare providers’ and LARC users’ narrative emplotments in the prescription and usage decisions about LARC, semi-structured interviewing was used. The questions asked were open-ended and loosely structured around LARC technologies, the decisions that cohere around them, and the makers of those decisions. In analysing the data, I fused Parker's (1992) criteria for locating discourses with Barker’s (2017) method for determining the potential for emplotment into narratives. Findings suggest that participants framed contraceptive usage as either a personal, imposed, or shared decision. In personal decisions, the feminisation of contraceptive use emerged, with study, work, and relationship stability statuses requiring participants to solely and prudently self-discipline towards contraceptive uptake so as to match usage with reproduction desire. When decisions were imposed (subtly or openly), a passive role was assumed as female guardians (mothers, grandmothers, or aunts) recommended, pushed, and coerced health users (particularly young women) towards uptake. While the contraceptive users themselves were placed on the margins in decision-making, resisting the imposed decisions was difficult since participants’ “risk” of pregnancy was reportedly foregrounded. Shared decisions pointed to less one-sided accounts of decision-making. These decisions were enacted in relationships and were neither siloed nor imposed. Here, sexual partners, parents, or healthcare providers dialogically negotiated contraceptive uptake, and the possibilities for non-use were availed. Data from healthcare providers showed that non-use for young and postpartum women was not an option. In addition, healthcare providers either formed alliances with the LARC users themselves or concerned parents to support or push for contraceptive provision. Supportive alliances enabled secret uptake or ongoing contraceptive usage among some contraceptive users, thus resisting pronatalism or one-sided intentions for childbearing within intimate partnerships. These healthcare providers emplotted themselves as empowering contraceptive users. Alliances that pushed for contraceptive uptake were formed with guardians/parents upon menarche or in case the of rape. In overriding consent within these alliances, healthcare providers avoided being rendered responsible or blameworthy for early pregnancies in the face of the constructed risk used to emplot young women. This over-commitment to providing contraceptives has differing implications for women’s sexual agency and sexual health interventions. The data also describe decisions to use contraception as expert-led, patient-led, or collaborative decisions between health users and healthcare providers. Through the information and decision-making was expert-led micro-narrative, a medical discourse constituting use as a necessity and non-use as a risk emerged. A patient autonomy and a my body, my choice discourse informed the information and decision-making was patient-led micro-narrative; here, healthcare providers were either detached or excluded from decision-making as health users assumed more active roles in their own contraceptive care decisions. In collaborative decisions, both parties negotiated (non)use, with LARC users providing their embodied experiences and healthcare providers availing medical knowledge in reaching decisions. The study argues for a reproductive justice framework to underpin the signifier “fertility control”, showing how the threat of degeneration informs responses to reproduction by iii identifying and amplifying deficiency and negative outcomes while masking positive outcomes among certain women. It then creates a fertile ground for the re-engineering and recentring of colonialist thinking and its product, the restraining of the agency of fertile beings it renders “less developed”. , Thesis (PhD) -- Faculty of Humanities, Psychology, 2024
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Date Issued: 2024-10-11

“What’s good fam?”: African digital sociality and notions of community and family in the UCKAR Facebook group

Authors: Dube, Hope Mutipeni
Date: 2024-10-11
Subjects: Digital society , Facebook (Firm) , Social media and college students South Africa Makhanda , Education, Higher Social aspects , Sociology Africa , College students Social life and customs , College students Social networks
Language: English
Type: Academic theses , Master's theses , text
Identifier: http://hdl.handle.net/10962/465887 , vital:76665
Description: This study explores the digital sociality of the UCKAR Facebook group. This student Facebook group was formed during the 2015 #RhodesMustFall period. The acronym UCKAR stands for the “University Currently Known As Rhodes” and signifies hope for the transformation of the university. Qualitative interviews were conducted to investigate how UCKAR Facebook group understood and interpreted their sociality, i.e. what do they mean when they say “we” or “us”; how such understandings emerged from group membership descriptions and interpersonal obligations as well as the actual social interactions and participation in the group through digital practices, that is, posting and commenting. A qualitative thematic analysis was undertaken through grouping together representations of various notions of the nature and purpose of their Facebook group as a social space, or its sociality. The findings revealed how various digital socialities co-exist in the same digital space. They reflect different ways in which group members can relate to each other meaningfully: either as fellow students, activists, student entrepreneurs and customers, caring community members or fellow revellers. I refer to these socialities as “Rhodent sociality”, “comrade sociality”, “hustle sociality”, “ubuntu sociality” and “groovist sociality”. These socialities are evidentially not mutually exclusive, and members can and do engage in multiple socialities within the group or shift amongst them depending on the situation. In this analysis, these socialities are linked to the existing scholarship on digital socialities. The findings suggest that the resilience to survive in an alien cultural space does not only demand a digital space that supports rational political resistance and practical tips to navigate the space as seen in the “comrade sociality” and “Rhodent sociality”. It also requires a digital space which can incorporate elements of communal care, economic survival and at times a Bakhtinian carnivalesque outlet to momentarily invert an unjust society . I call this kind of digital sociality a survivalist digital community, which is a form of digital sociality created by persons who need to survive a space that was not designed for people like them, and is underpinned by survivalist knowledge. , Thesis (MA) -- Faculty of Humanities, Journalism and Media Studies, 2024
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Date Issued: 2024-10-11

Translanguaging pedagogies and practice for social justice in a multilingual South African previously disadvantaged

Authors: Mpofu, Tarisai
Date: 2024-06
Subjects: Multilingualism
Language: English
Type: Doctoral theses , text
Identifier: http://hdl.handle.net/11260/11131 , vital:75921
Description: Over the last two decades, there has been a burgeoning interest in translanguaging as both a theory and a methodology, but a few studies have looked at it as a pedagogy. This has meant that while there is near-consensus on translanguaging’s contribution to knowing, there have been few studies on how it can be implemented systematically in classrooms. This study examines how translanguaging is being practiced at one South African university and makes recommendations on how translanguaging can be implemented systematically for better impact. A mixed method approach was used, meaning that it had both qualitative and quantitative elements. Data for this study were gathered using online questionnaires completed by students and lecturers, interviews with lecturers, and observation. The results show that limited translanguaging was taking place in the classroom, despite both students and staff acknowledging its value to epistemic access. This study calls for intentional and systematic implementation of translanguaging to contribute to socially-just classroom practices. The study proposes the translanguaging matrix model for practice to assist in institutionalising translanguaging through the provision of short learning courses for staff and students on translanguaging, language learning opportunities and clear pedagogical training on when translanguaging must be used in classroom contexts. Key Words: Translanguaging, Language Policy, Social Justice, Multilingalism, Pedagogy , Thesis (D.Ed) -- Faculty of Education, 2024
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Date Issued: 2024-06

A capabilities analysis: degree mobility and the impact of returning South African alumni on their home country’s sustainable development

Authors: Mwatunga, Carina Brigitte
Date: 2024-04-05
Subjects: Sustainable development South Africa , Education, Higher , Sustainable Development Goals (Project) , Capabilities approach (Social sciences) , Agent (Philosophy) , Graduate student mobility
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/436570 , vital:73283 , DOI 10.21504/10962/436570
Description: The significance of sustainable development (SD) has gained increasing attention, particularly since introducing the Sustainable Development Goals (SDGs) in 2015. SDG 4 focuses on ensuring inclusive and high-quality education for all individuals, as well as the provision of equitable access to lifelong learning opportunities. In addition, SDG 4 recognises education as a fundamental element of societal progress and SD. Given the role of education in fostering economic growth, social cohesion, and individual empowerment, SDG 4 is a crucial component of global efforts to foster a more prosperous and equitable world. The primary focus of the study explained in this thesis was to address a specific aspect of Higher Education (HE) within the framework of the SDGs. While SDG 4 covers a wide range of targets, such as expanding scholarship opportunities for individuals from the Global South to study abroad, there remains a lack of comprehensive understanding of how pursuing a degree in a foreign country can influence graduates' potential contributions to sustainable development (SD) upon returning to their home countries. Moreover, despite researchers highlighting the need for attention to this topic, it has not received adequate focus thus far. Therefore, drawing upon the framework of the capability approach (CA) to sustainable development, the study explored whether returning graduates could contribute to SD in South Africa. To integrate the concepts of SD and CA, the study developed a framework for a responsible agent (RA), which was facilitated through previous studies. This framework provides a set of capabilities that are essential for supporting SD in South Africa. Based on this framework, the study comprehensively explored the experiences of postgraduate students and their potential to contribute to SD in South Africa. The study drew on survey data, semi structured interview, and document analysis to gain insights into how the structures of six selected scholarships aligned with SD objectives. However, upon analysing the eligibility criteria of these scholarships, it became evident that they already take into account certain capabilities associated with the RA in candidates. Furthermore, the analysis revealed that these scholarships tend to favour candidates who exhibit the potential to succeed in their professional endeavours. Therefore, this selection bias may exacerbate the existing inequalities within the South African education system. By disproportionately supporting candidates with advantages or resources, the scholarships may inadvertently perpetuate the disparities in educational opportunities and hinder progress toward a more equitable system. After administering questionnaires to alumni who had received these six scholarships, they were asked to voluntary participate in semi-structured interviews. Thereafter, data obtained was combined with document analysis, questionnaires, and interviews were analysed drawing on the RA framework with a narrative inquiry approach. The analysis of the data gathered during interviews with alumni revealed that certain capabilities were demonstrated and developed because of their degree mobility (pursuing degrees in different locations). However, it was also observed that some capabilities were negatively impacted by this mobility. Thus, the findings suggested a nuanced relationship between degree mobility and the development of specific capabilities amongst alumni, warranting further investigation to understand the implications of degree mobility on various capabilities. The investigation of the study revealed that the structure of the selected scholarships is not fully aligned with SD and that some capabilities can be damaged through degree mobility. To ensure that the scholarships truly support SD, they would require restructuring and (1) lowering expectations and preparing alumni for an often rather difficult return to South Africa; (2) limiting the available scholarships to degree programmes that are less or not affordable at all in South Africa; (3) implementing a re-entry strategy for returning alumni to make the return more manageable; and (4) collecting more data to create a deeper understanding about the possible achievements of individual alumni. , Thesis (PhD) -- Faculty of Education, Centre for Higher Education Research, Teaching and Learning, 2024
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Date Issued: 2024-04-05

A multidisciplinary study to assess the ecology of the Cape sea urchin, Parechinus angulosus, and its emerging use as a bioindicator to monitor coastal resiliency

Authors: Redelinghuys, Suzanne
Date: 2024-04-05
Subjects: Intertidal ecology , Parechinus angulosus , Sea urchins Morphology , Sea urchins Climatic factors , Phylogeography , Morphometrics , Microbiomes , Marine invertebrates
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/435691 , vital:73179 , DOI 10.21504/10962/435692
Description: The resilience of marine species in the face of unpredictable climate change stands as a paramount concern for the maintenance of ecological stability. Under such fluctuating conditions, it is critical to understand how organisms mitigate these effects in physiological, genetic, and morphological terms. To that end, this thesis focused on the Cape sea urchin, Parechinus angulosus, employing a multidisciplinary approach encompassing morphology, genomics, and gut microbial diversity to assess its potential as a bioindicator species and elucidate its adaptive strategies in response to varying environmental conditions along the South African coastline. This was achieved through studying their anatomy in order to link observed variation to prevailing local environmental conditions, aided by the species’ wide distribution range which allows insight into adaptations across broad geographic regions and ecological settings. The first empirical chapter, Chapter 3, focusing on eight key morphometric traits of test, Aristotle’s lantern and spines, revealed distinct variation in the Cape sea urchin's morphology between the east and west coasts of South Africa, suggesting the presence of some level of local adaptation to the prevailing environmental factors found on the east and west coasts of South Africa. This points to potential bioindicator capabilities of the species, reflecting adaptive divergence amidst contrasting environmental conditions. Further analysis is however necessary in order to isolate specific physiological trends that may be associated with these morphometric differences, thereby enhancing and tightening their ecological implications. The second experimental chapter, Chapter 4, delved into the genetic structure of the Cape urchin by investigating genome-wide diversity, the presence of cryptic population structure, and spatial patterns of genomic diversity. Moderate genomic differentiation was detected among populations along the eastern and western coasts of South Africa by outlier loci that may undergo natural selection, which could indicate local adaptation to environmental conditions. This pattern hints at adaptive differentiation and cryptic genetic structures within the Cape sea urchin populations and emphasises the species' potential adaptive responses to localised (in this case regional) environmental pressures. Assigning functional significance to these genetic variations will require a comprehensive annotated reference genome, a limitation acknowledged in the current study. Chapter 5 explored the gut microbial diversity and revealed significant compositional variations between the east and west coast populations of South Africa, confirming regional and inter-regional variation. This chapter also highlighted the essential biochemical pathways critical to the survival of the host which is crucial for assessing the health of the urchin host. Together, the functional content of the gut bacteria and microbial diversity showcases its potential as a bioindicator for coastal ecosystem health. Logistical challenges and confounding factors like host physiology will need to be fully considered for its effective application. Overall, the findings of this doctoral research suggest that the Cape sea urchin displays promising characteristics as a bioindicator species due to its morphological, genetic, and gut microbial variations in response to environmental differences, providing a diverse array of means in which urchins could be used as bioindicators, from their uses to assess water quality and detect pollution, to ecosystem health monitoring and biodiversity studies in which sea urchin abundance, distribution, and presence are monitored. Further research, integrating these multidisciplinary approaches is recommended to validate and refine its bioindicator potential. Additionally, the development of a comprehensive annotated reference genome is imperative to harness the species' genetic information effectively. This study underscores the significance of integrating multiple disciplines in understanding how species respond to environmental change and their potentials contributions to monitor ecological resilience. The original multidisciplinary approach, combined with high computational outputs presents a promising framework for a comprehensive ecological monitoring in marine ecosystems. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2024
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Date Issued: 2024-04-05

Co-occurrence of Sympatric Poroderma Species

Authors: Watson, Ralph Gareth Andrew
Date: 2024-04-05
Subjects: Scyliorhinidae South Africa Mossel Bay , Coexistence of species , Leopard catshark , Poroderma africanum , Underwater acoustic telemetry , Gastric lavage , Baited remote underwater video
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/436649 , vital:73289 , DOI 10.21504/10962/436649
Description: Species exploiting similar ecological niches are expected to adapt their behaviour, which can either promote or hinder coexistence. This study examined the ecological (dis)similarity between the endemic Poroderma africanum (pyjama catshark) and Poroderma pantherinum (leopard catshark) in Mossel Bay, South Africa. The co-occurrence of these species was examined along the ecological axes of time, trophic position and space, between October 2015 and April 2018, through the use of Baited Remote Underwater Videos (BRUV), gastric lavage, and acoustic telemetry. Through the deployment of 197 BRUVs, P. africanum showed a seasonal, higher Relative Abundance (RA = 0.52), occurring more frequently during winter months, while showing an overall decline in RA over the course of the study period. Poroderma pantherinum on the other hand, showed a lower, unseasonal RA (0.20), remaining relatively stable throughout the study period. The BRUV deployments indicated that the two species showed a positive co-occurrence with one other, being sighted in BRUV deployments more frequently together as opposed to in isolation/at random. Acoustic telemetry indicated that the two species were active during different diel periods, influenced by a complex combination of tidal and diel rhythms, while P. pantherinum showed a higher residency compared to P. africanum (P. pantherinum: Continuous Residency Time (CRT)24 = 3.32 days (mean), 95% CI: 2.53–4.11 days; P. africanum: CRT24 = 2.01 days, 95% CI: 1.66–2.36 days). While the two species are sympatric in nature, and have an overlapping, endemic, distribution, acoustic telemetry indicated that 1 ABSTRACT P. africanum showed higher degrees of movement throughout the acoustic receiver array (P. africanum: edge density (ED) = 0.25; P. pantherinum: ED = 0.12); however, certain areas of the bay showed to be of high importance for both species. Both species revealed high levels of intra- and inter-specific variation in both residency and movement behaviour. Gastric lavage indicated partially overlapping trophic niches, between the two Poroderma spp. Poroderma africanum had a generalist diet, dominated by teleosts (Index of Relative Importance (IRI)% = 22.69), octopus (IRI% = 11.48) and discarded bait (IRI% = 64.54), while P. pantherinum showed indications of being a specialist predator, with a diet dominated by cephalopods (IRI% = 83.68). The two Poroderma spp. showed a partially overlapping, but separate trophic niches, while displaying spatial dissimilarity in diet. The study suggests that the two species are able to coexist within the same geographical area through niche differentiation across trophic and temporal ecological axes, with varying spatial use. The intra- and inter-specific differences between the two species may complicate elasmobranch management efforts for these co-occurring endemic catsharks, and as such, efforts should follow either an individual species approach, which is often not feasible, or an ecosystem-based approach, as opposed to considering the genus as a whole. , Thesis (PhD) -- Faculty of Science, Ichthyology and Fisheries Science, 2024
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Date Issued: 2024-04-05

Developing biological control agents for the management of the invasive tree Robinia pseudoacacia

Authors: Wolmarans, Abigail
Date: 2024-04-05
Subjects: Black locust South Africa , Invasive plants Biological control , Insects as biological pest control agents , Prioritization , Vegetative propagation , Locust leafminer
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/435717 , vital:73181 , DOI 10.21504/10962/435717
Description: Robinia pseudoacacia (Fabaceae) is a deciduous tree native to the Appalachian Mountains of North America but has become naturalised and invasive in other countries such as temperate North America, Europe, Australia, and Southern Africa. In South Africa the tree is classified as a category 1B invasive alien under the National Environmental Management Act (NEMBA), which stipulates the species requires some form of control as it has already caused extensive negative ecological and economic impacts. In the invaded range the tree creates monocultures that displace native species and spreads rapidly from suckering roots, making it a proficient invader. The South Africa plant prioritisation system suggests R. pseudoacacia is in the top three species which should be considered for classical weed biological control in South Africa. This thesis investigates which insects known to be associated with tree should be prioritised as candidate agents, as well as offering interesting insights into prioritising insects for weed biological control and using plant phylogenies and available literature to predict insect specificity. To ensure that no candidate biological control agents were already present in South Africa as well as to prioritise which guilds of the tree to prioritise for potential biological control, pre-release surveys were conducted across nine sites where the tree has invaded South Africa. It was found that no insects from the native range of R. pseudoacacia were present in South Africa. Seed surveys revealed that generalist insects attack a sizable proportion (68 %) of the seeds on the trees. In combination with a low seed soil bank (15.8 %) this suggests that seed- feeding agents may be helpful, however, candidate agents which damage leaves should be prioritised due to R. pseudoacacia relying heavily upon vegetative reproduction and much less on sexual reproduction. Leaves may therefor reduce the spread of these invasive trees. The insect assemblages in the native range of R. pseudoacacia are well understood. In addition, several associated insects have unintentionally followed the tree on its global spread, where they are often regarded as pests. The third chapter is therefore aimed at prioritising the known insects associated with the tree in both the native and invaded range. Literature surveys and Harris (1973) prioritisation systems were used to prioritise close to 64 candidate biological control agents down to three foliage- feeding agents, namely Odontota dorsalis (Coleoptera, Chrysomelidae), Macrosaccus robiniella (Lepidoptera, Gracillariidae) and Obolodiplosis robiniae (Diptera, Cecidomyiidae). To further prioritise the six selected agents in Chapter 4, species distribution were modelled with known climatic variables. This was done by using the species known occurrence localities, from both the native and where applicable invaded ranges, to identify which species that would best match with South Africa’s climate. The study showed that O. dorsalis is best suited to survive in South Africa, followed by O. robiniae and then M. robiniella. Collected data aided in the introduction of the prioritised O. robiniae into South African quarantine facilities. Unfortunately, despite several attempts, cultures could not be established, making conventional host specificity testing impossible. Thus, in Chapter 5 we aimed to determine the potential host range of the midge using information from experts in the field of galling insects, literature surveys, agricultural pest lists, and social science platforms coupled with native and invaded range surveys. The list of non-target species to consider as potential hosts was refined by developing phylogenetic trees of closely related Fabaceae that share the same distribution (native and invaded) as R. pseudoacacia. Through the available information gathered, and field surveys of these species, O. robiniae has not been shown to utilise any species, other than those from the Robinoid clade. In addition, the midge has also never been recorded on a number of closely related leguminous fodder and horticultural species growing in close proximity at high densities to R. pseudoacacia - suggesting negligible risk to South African growers of the same species. Host-specificity assessments through field surveys can be regarded as one of the best indicators of the ecological host range, however, this information is difficult to quantify and infrequently available, thus seldom used when determining the safety of a candidate biocontrol agent. In this unique study, using the extensive data collected we are able to show that O. robiniae would be potentially safe for release in South Africa. However, open field tests exposing closely related non-target plant species under natural and semi-natural conditions are planned in Switzerland over the next two years aiming to confirm these conclusions. By identifying and prioritizing potential biological control agents, this research contributes to the development of a targeted and sustainable solution for managing R. pseudoacacia in South Africa. The economic implications of successful biological control include reduced costs associated with invasive species management and ecosystem restoration. Additionally, by mitigating the negative ecological impacts, the agricultural systems in affected regions stand to benefit from enhanced resilience and productivity. Furthermore, the study's approach of using plant phylogenies and available literature to predict insect specificity offers a valuable methodological contribution to the broader field of weed biological control. This methodology can be adapted and applied to other invasive species, providing a framework for efficient and informed decision-making in weed management strategies. In essence, this research not only addresses the specific challenges posed by R. pseudoacacia in South Africa but also provides a template for tackling similar issues in different geographical contexts, thereby contributing to global efforts in sustainable agriculture and environmental conservation. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2024
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Date Issued: 2024-04-05

Ecological impacts of photoautotrophic Euendoliths on South African mussel beds

Authors: Dievart, Alexia Madeleine Angèle
Date: 2024-04-05
Subjects: Mexilhao mussel , Polychaeta , Epibiosis , Infauna , Infrared thermography , Thermography , Common garden experiment
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/435650 , vital:73176 , DOI 10.21504/10962/435650
Description: Aphytis lingnanensis was reared and tested in South Africa in the early 2000s for augmentation against red scale on citrus and was found to be ineffective. Aphytis melinus is now commercially available and it is important that the efficacy of augmentation thereof on red scale is determined locally. Field trials, fitness assessments and molecular identification on A. melinus from two insectaries were done. Field trials was done in seven, five and six pairs of comparable release and control orchards across the Eastern and Western Cape during the seasons of 2019/2020, 2020/2021 and 2021/2022 respectively. Red scale infestation was monitored and a sample of 20 infested fruit from each orchard was randomly collected every four weeks. Aphytis spp. responsible for parasitism were identified and the percentage parasitism recorded. Results of this study of field trials suggest that the augmentation of A. melinus did not significantly increase the level of parasitism above that of the untreated control. Five repetitions with six replicates of flight and longevity tests were performed with wasps from each insectary. Wasps in the longevity test from two insectaries were kept at 23 °C and 65% RH with honey. Flight tests were performed in tubes of 16 by 30 cm, with a light above a clear, sticky ceiling at 23 °C and 65% RH. On average in five replicates, 65%, 33% and 17% A. melinus wasps were alive on day one, five and 10 respectively. The overall sex ratio was 1.58 for females to males, but 1.05, 2.19 and 2.66 for non-flyers, non-crawlers, crawlers, and flyers respectively. In flight tests for both insectaries combined, only 36.97% of wasps could initiate flight in 24 h while 56.96% remained on the tube floor, and 6.05% attempted to crawl upwards. No significant differences in flight performance were recorded between the two insectaries. Wasps from the local insectary lived significantly longer during the longevity tests but were shorter in transit than wasps from the overseas insectary. COI genes were sequenced and compared against Genbank sequences using BLAST. Molecular identifications did not confirm morphological identifications for all species, indicating unexpected genetic complexity. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2024
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Date Issued: 2024-04-05

Exploring and expanding teachers’ gender and culturally responsive practices when mediating learning of chemistry in rural schools in Namibia

Authors: Haimene, Johanna Shetulimba
Date: 2024-04-05
Subjects: Chemistry Study and teaching (Secondary) Namibia , Discrimination in education Namibia , Gender and education , Culturally relevant pedagogy Namibia , Cultural-historical activity theory , Expansive learning , Group work in education
Language: English
Type: Academic theses , Doctoral theses , text
Identifier: http://hdl.handle.net/10962/436535 , vital:73280 , DOI 10.21504/10962/436536
Description: Gender and cultural dimensions are critical aspects of the education system. Schools are full of gender and cultural stereotypes when it comes to the teaching and learning of science. This calls for the teachers to be gender and culturally responsive in their science classrooms. This is also to ensure that the educational needs of both boys and girls are addressed. The Namibian National Curriculum for Basic Education advocates the application of gender equity at all levels and in every aspect of the curriculum and teachers are central to the implementation of this curriculum. However, while the policy has been formulated at the macro level of the education system, little if any research has been done in Namibia on exploring how teachers are coping with and implementing the curriculum based on gender and cultural aspects. This includes how teachers are responding to gender issues and how they eradicate bias and discrimination to ensure equality and equity for both boys and girls in their science teaching. Against this backdrop, this study aimed to explore and expand Grade 9 Physical Science teachers’ gender and culturally responsive practices in science classrooms when mediating learning of chemistry topics using acids and bases and combustion reactions as examples. The study focused on working with teachers with the purpose of improving their practices through collaborative partnerships and enriching all the participants (teachers and researcher) as they were seen as co-learners and co-researchers. Hence, this study was underpinned by interpretivist and critical paradigms. It adopted a case study research design. Six Grade 9 Physical Science teachers from the Oshikoto Region were the participants in this study. Qualitative data were generated using questionnaires, interviews (semi-structured and stimulated recall), classroom observations and Change Laboratory Workshops (CLWs) in which we co-developed a tool to address gender and cultural responsiveness. Vygotsky’s socio-cultural theory and Engeström’s cultural-historical activity theory (CHAT) were used as theoretical frameworks to surface contradictions or tensions that exist in the teaching and learning process. A thematic approach to data analysis was employed to come up with sub-themes and themes. The findings of the study revealed that the teachers seemed to have an understanding of being gender and culturally responsive when they are mediating their lessons. However, some contradictions constrained them from being gender and culturally responsive. The surfaced contradictions included the lack of examples that are not gender and culturally biased, poor participation of the learners during lesson presentation and low confidence among the learners and language barriers. In addition, the findings revealed that teachers need professional development in interpreting policies and the curriculum and techniques for analysing gender and cultural issues pertaining to the teaching and learning process. Through CLWs, we co-developed a mediational tool that could guide teachers on how to be gender and culturally responsive. The findings also revealed that participation of teachers in the CLWs equipped them with resources on how to be gender and culturally responsive in their classrooms. The study recommends that teachers need to be involved in continuing professional development to support them with the correct interpretation and enactment of the curriculum and other policies. The policy developers need to be in contact with the policy implementers to evaluate the implementation of these policies and provide guidance where necessary. Moreover, teachers need to form professional learning communities in order to share their best practices and transform them. This might assist them in addressing gender and cultural issues that are encountered in the teaching and learning process. , Thesis (PhD) -- Faculty of Education, Secondary and Post School Education, 2024
Full Text:
Date Issued: 2024-04-05

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