Instagram and male body image: an in-depth study of perceptions surrounding Instagram-related body ideals amongst gym-going, male students at Rhodes University.
- Nikiforos, Declyn Michael Costa
- Authors: Nikiforos, Declyn Michael Costa
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434584 , vital:73087
- Description: Guided by the disciplinary power and social comparison theories, this study sought to explore the perceptions of Instagram-related male body ideals amongst young, gym-going men enrolled at Rhodes University. Seven in-depth interviews were conducted, and the responses suggested that Instagram use shaped young men’s body-related perceptions in a variety of complex ways. The findings suggested that Instagram exposed users to a lean and muscular body ideal and that perceptions of this ideal were shaped by factors such as Instagram’s positivity bias, the age of users, and the exposure to the idealised bodies of fitness influencers. Furthermore, perceptions of Instagram’s male body ideal were influenced by context. Black South Africans that attended majority white high schools were more likely to conform to the male body ideals associated with their school environment. In such instances, individuals rejected the body norms associated with their ethnic backgrounds in lieu of striving for a lean and muscular body. Additionally, perceptions of body dissatisfaction were evident in cases where upward social comparisons were made with unrealistic male body ideals. Conformity to Instagram’s male body ideal also suggested that male users were subjected to a coercive form of power that resulted in their active participation in the reproduction of male body ideals. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Nikiforos, Declyn Michael Costa
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434584 , vital:73087
- Description: Guided by the disciplinary power and social comparison theories, this study sought to explore the perceptions of Instagram-related male body ideals amongst young, gym-going men enrolled at Rhodes University. Seven in-depth interviews were conducted, and the responses suggested that Instagram use shaped young men’s body-related perceptions in a variety of complex ways. The findings suggested that Instagram exposed users to a lean and muscular body ideal and that perceptions of this ideal were shaped by factors such as Instagram’s positivity bias, the age of users, and the exposure to the idealised bodies of fitness influencers. Furthermore, perceptions of Instagram’s male body ideal were influenced by context. Black South Africans that attended majority white high schools were more likely to conform to the male body ideals associated with their school environment. In such instances, individuals rejected the body norms associated with their ethnic backgrounds in lieu of striving for a lean and muscular body. Additionally, perceptions of body dissatisfaction were evident in cases where upward social comparisons were made with unrealistic male body ideals. Conformity to Instagram’s male body ideal also suggested that male users were subjected to a coercive form of power that resulted in their active participation in the reproduction of male body ideals. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2024
- Full Text:
- Date Issued: 2024-04-03
Issues in language acquisition planning in Zimbabwe: the case of Ndebele within the primary education system
- Authors: Masuku, Seabird
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434626 , vital:73091 , DOI 10.21504/10962/434627
- Description: This thesis discusses pertinent language issues within the primary school system in Zimbabwe in view of complaints (over many years) of communities in the two Matabeleland provinces and Bulawayo about high failure rates of learners in the final grade 7 examinations. It also interrogates the government’s commitment to the development of indigenous languages in the primary school system, particularly in the three provinces mentioned above as mirrored in the 2013 constitution of the country. The study conducted traces the language trends exhibited currently back to their beginnings during the colonial era in language planning by the government and the policies that informed such planning. What obtains on the ground seems to be violating the principles behind the declaration of the International Mother Language Day (30C/62) proclaimed by the General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in November 1999. On 16 May 2007 the United Nations General Assembly, in its resolution A/RES/61/266, called upon Member States (Zimbabwe included) "to promote the preservation and protection of all languages used by peoples of the world". The amended education act of 2006 states that in Zimbabwe’s primary schools early learning must be done through mother tongue instruction then switch to English in grade 4 upwards. As a first step of a child’s academic life, the lower primary education needs to be conducted in the child’s mother tongue to bridge the gap between the child’s home environment and the new school environment as well as to reduce culture shock associated with the sudden introduction of a new language. Studies, such as those done by Noormohamadi, (2008) and Mackenzie, (2013) have shown that children tend to understand better if they are taught in their mother tongue. In this thesis I seek to establish if the teaching of Ndebele at primary school reveals the socio-cultural ideology (awareness of circumstances surrounding individuals and how their behaviours are affected, specifically by their surroundings, social and cultural factors) and political ideology (thinking structures about the way policies should be run) underpinning language planning in Zimbabwe. It is my observation and argument that the Education Act proclaims what has not been practised on the ground through teacher training and deployment practices. To establish if the teaching of Ndebele at primary school reveals the socio-cultural and political ideologies underpinning language planning in Zimbabwe, I carried out research in Matabeleland South, Bulawayo and Matabeleland North provinces covering a total of 27 schools, 27 heads of school and 135 teachers. The research’s main aims were to find out if Ndebele was taught at school, by who and using what materials. It should be noted that mother tongue, in learning, acts as a basis of interpretation of subsequent concepts. When a child is learning new concepts or words in the second language, he or she first searches the equivalent in his or her mother tongue. If the primary language has not been developed well enough to have such equivalents, such a child is likely to have problems in forming new concepts in the second language. The role of language in meaning, therefore, is a variable that depends on the socio-geographical location of the languages and their speakers. The research established that, indigenous languages, Ndebele included, are not developed by the government through financial support for teaching material production and qualified teacher deployment. Instead, it was discovered that in Matabeleland there are some learners at primary school who are taught by a Shona-speaking teacher who cannot communicate properly with the learners. It should be remembered that a primary language is used by a child as the foundation to learn the basic concepts in his or her own language and to give him or her freedom to express himself or herself without the inhibitions imposed by an insufficient mastery of the medium of instruction. As a way of concluding the research I found it necessary that the use of mother tongue by learners at lower grades of primary school be strengthened through the deployment of teachers who can teach Ndebele properly because it provides a strong foundation for further education. Using the mother tongue, students learn to think, communicate and acquire an intuitive understanding of grammar. The mother tongue is; therefore, the greatest asset and vital tool people use to acquire new concepts. , Thesis (PhD) -- Faculty of Humanities, School of Languages and Literatures, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Masuku, Seabird
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434626 , vital:73091 , DOI 10.21504/10962/434627
- Description: This thesis discusses pertinent language issues within the primary school system in Zimbabwe in view of complaints (over many years) of communities in the two Matabeleland provinces and Bulawayo about high failure rates of learners in the final grade 7 examinations. It also interrogates the government’s commitment to the development of indigenous languages in the primary school system, particularly in the three provinces mentioned above as mirrored in the 2013 constitution of the country. The study conducted traces the language trends exhibited currently back to their beginnings during the colonial era in language planning by the government and the policies that informed such planning. What obtains on the ground seems to be violating the principles behind the declaration of the International Mother Language Day (30C/62) proclaimed by the General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in November 1999. On 16 May 2007 the United Nations General Assembly, in its resolution A/RES/61/266, called upon Member States (Zimbabwe included) "to promote the preservation and protection of all languages used by peoples of the world". The amended education act of 2006 states that in Zimbabwe’s primary schools early learning must be done through mother tongue instruction then switch to English in grade 4 upwards. As a first step of a child’s academic life, the lower primary education needs to be conducted in the child’s mother tongue to bridge the gap between the child’s home environment and the new school environment as well as to reduce culture shock associated with the sudden introduction of a new language. Studies, such as those done by Noormohamadi, (2008) and Mackenzie, (2013) have shown that children tend to understand better if they are taught in their mother tongue. In this thesis I seek to establish if the teaching of Ndebele at primary school reveals the socio-cultural ideology (awareness of circumstances surrounding individuals and how their behaviours are affected, specifically by their surroundings, social and cultural factors) and political ideology (thinking structures about the way policies should be run) underpinning language planning in Zimbabwe. It is my observation and argument that the Education Act proclaims what has not been practised on the ground through teacher training and deployment practices. To establish if the teaching of Ndebele at primary school reveals the socio-cultural and political ideologies underpinning language planning in Zimbabwe, I carried out research in Matabeleland South, Bulawayo and Matabeleland North provinces covering a total of 27 schools, 27 heads of school and 135 teachers. The research’s main aims were to find out if Ndebele was taught at school, by who and using what materials. It should be noted that mother tongue, in learning, acts as a basis of interpretation of subsequent concepts. When a child is learning new concepts or words in the second language, he or she first searches the equivalent in his or her mother tongue. If the primary language has not been developed well enough to have such equivalents, such a child is likely to have problems in forming new concepts in the second language. The role of language in meaning, therefore, is a variable that depends on the socio-geographical location of the languages and their speakers. The research established that, indigenous languages, Ndebele included, are not developed by the government through financial support for teaching material production and qualified teacher deployment. Instead, it was discovered that in Matabeleland there are some learners at primary school who are taught by a Shona-speaking teacher who cannot communicate properly with the learners. It should be remembered that a primary language is used by a child as the foundation to learn the basic concepts in his or her own language and to give him or her freedom to express himself or herself without the inhibitions imposed by an insufficient mastery of the medium of instruction. As a way of concluding the research I found it necessary that the use of mother tongue by learners at lower grades of primary school be strengthened through the deployment of teachers who can teach Ndebele properly because it provides a strong foundation for further education. Using the mother tongue, students learn to think, communicate and acquire an intuitive understanding of grammar. The mother tongue is; therefore, the greatest asset and vital tool people use to acquire new concepts. , Thesis (PhD) -- Faculty of Humanities, School of Languages and Literatures, 2024
- Full Text:
- Date Issued: 2024-04-03
Short Composition Portfolio
- Authors: Mavuso, Bonelela Lindelani
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434778 , vital:73104
- Description: Short Composition Portfolio (60% performance/40%short-compositionportfolio). , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Mavuso, Bonelela Lindelani
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434778 , vital:73104
- Description: Short Composition Portfolio (60% performance/40%short-compositionportfolio). , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2024
- Full Text:
- Date Issued: 2024-04-03
The impact of influencer characteristics on parasocial relationships and purchase intentions
- Ngobeni, Marina Precious Sibongile
- Authors: Ngobeni, Marina Precious Sibongile
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434734 , vital:73100
- Description: Access restricted. Expected release in 2026. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Ngobeni, Marina Precious Sibongile
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434734 , vital:73100
- Description: Access restricted. Expected release in 2026. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
The influence of electronic-consumer experience (e-CX) on consumer post-purchase outcomes of South African e-commerce retail organisations
- Authors: Williams, Alyssa Shawntay
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434828 , vital:73108
- Description: Access restricted. Expected release in 2026. , Thesis (PhD) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Williams, Alyssa Shawntay
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434828 , vital:73108
- Description: Access restricted. Expected release in 2026. , Thesis (PhD) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
The influence of strategic leadership on the performance of small and medium-sized enterprises as mediated by strategy implementation
- Authors: January, Nceba
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434723 , vital:73099
- Description: Small and medium-sized enterprises (SMEs) are viewed as the cornerstone of socio-economic development in many economies globally. The progressive contribution of SMEs to the global economy is irrefutable and enshrined in poverty alleviation, inclusive economic growth, and job creation strategies pursued by many economies worldwide. SMEs are primarily the form of enterprise that accounts for over 90% of all businesses; thus, Small and Medium-sized Enterprises are the main source of employment. SMEs' contribution to value creation is estimated to be above 50% on average. In emerging countries, particularly South Africa, SMEs contribute approximately 45% of the total employment and 33% of the Gross Domestic Product (GDP). In most countries, Small and Medium-sized Enterprises contribute to more than 50% of employment and GDP, and these figures become significantly higher when the informal small business sector is included. World Bank estimated 600 million jobs needed by 2030, making SME development a high priority for many governments worldwide. Despite globally acknowledged SME contributions, small businesses are still faced with many challenges that have ramifications on their survival, growth, and performance. Studies highlighted challenges such as lack of access to finance and funding modalities, appropriate technology and infrastructure, markets and social networks, and lack of research and development, strategic management skills, and inability to perform managerial tasks, among others. Recent studies have been conducted on many of these challenges; however, there is little known about the strategic management challenges that face SMEs and their business performance. Several studies were conducted on some of these strategic management challenges, such as strategic planning, strategic orientation, strategic agility, organisational flexibility, and total quality management. However, a review of studies relevant to SMEs and their performance is silent on the argument regarding the influence of strategic leadership on the performance of SMEs, especially when key drivers of effective strategy implementation mediate strategic leadership. Thus, this study investigated the influence of strategic leadership on the performance of SMEs as mediated by strategy implementation in Nelson Mandela Bay (NMB). A detailed theoretical investigation was conducted on the nature and role of strategic leadership, strategy implementation, and business performance of SMEs. Strategic leadership represents the independent variables of this study, namely: strategic direction, balanced organisational controls, organisational culture, organisation’s resource portfolio, and ethical practice, followed by the mediating variable (strategy implementation) and the dependent variable (business performance). An empirical investigation was also conducted to test the significant influence between these variables. This study adopted a positivistic approach using a quantitative research method. The sample size of the study was 390 respondents. Self-developed and structured questionnaires were physically distributed to 315 SME owners and managers in NMB using a convenience sampling method. Only 229 returned questionnaires were suitable and relevant to this study; thus, a 72.69% response rate was achieved. Returned questionnaires were cleansed, coded, and transferred to a statistical data analysis software called Statistica, version 14.0, for quantitative data analyses. The validity and reliability of the measuring instrument were confirmed using Exploratory Factor Analysis and the calculation of Cronbach’s alpha coefficients. Descriptive statistics was calculated to summarise the empirical data on demographic variables and the main variables of this study. Pearson’s correlations were calculated to determine the correlations between the main variables of this study, and the results confirmed that there is a positive influence between strategic leadership, strategy implementation, and business performance of SMEs. A multiple linear regression analysis was conducted to test the significance of the influence between the main variables of the study. A regression analysis outcome revealed that some of the strategic leadership activities (strategic direction, balanced organisational controls, and organisational culture) have a statistically significant positive influence on the business performance of SMEs. Furthermore, a statistically significant positive influence does exist between strategy implementation and business performance of SMEs. This study’s recommendations were suggested to SME owners/managers. Firstly, to formulate and develop a clear long-term vision of the business for the next 3 to 5 years. Align resources to key areas of business operation and set internal controls that will help set standards of desired performance and ultimately achieve them. Secondly, to formulate and implement shared values that connect employees to the business purpose and the way it is conducted. These shared values must be underpinned by a unique, valuable, and incomparable culture against competitors to gain a competitive edge. Furthermore, consider using rewards to recognise employees who embody the shared values of the business and are committed to the success of the business because of its culture. Thirdly, ensure both strategic and financial controls support strategy implementation and guide employees to achieve performance objectives. Use balanced scorecards to assess the effectiveness of controls in the business and put corrective measures to address performance gaps. Last but not least, invest in staff development and training, technological infrastructure, and set sound processes and systems for the business operation, establish structures that have clear lines of reporting, authority, and delegation. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: January, Nceba
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434723 , vital:73099
- Description: Small and medium-sized enterprises (SMEs) are viewed as the cornerstone of socio-economic development in many economies globally. The progressive contribution of SMEs to the global economy is irrefutable and enshrined in poverty alleviation, inclusive economic growth, and job creation strategies pursued by many economies worldwide. SMEs are primarily the form of enterprise that accounts for over 90% of all businesses; thus, Small and Medium-sized Enterprises are the main source of employment. SMEs' contribution to value creation is estimated to be above 50% on average. In emerging countries, particularly South Africa, SMEs contribute approximately 45% of the total employment and 33% of the Gross Domestic Product (GDP). In most countries, Small and Medium-sized Enterprises contribute to more than 50% of employment and GDP, and these figures become significantly higher when the informal small business sector is included. World Bank estimated 600 million jobs needed by 2030, making SME development a high priority for many governments worldwide. Despite globally acknowledged SME contributions, small businesses are still faced with many challenges that have ramifications on their survival, growth, and performance. Studies highlighted challenges such as lack of access to finance and funding modalities, appropriate technology and infrastructure, markets and social networks, and lack of research and development, strategic management skills, and inability to perform managerial tasks, among others. Recent studies have been conducted on many of these challenges; however, there is little known about the strategic management challenges that face SMEs and their business performance. Several studies were conducted on some of these strategic management challenges, such as strategic planning, strategic orientation, strategic agility, organisational flexibility, and total quality management. However, a review of studies relevant to SMEs and their performance is silent on the argument regarding the influence of strategic leadership on the performance of SMEs, especially when key drivers of effective strategy implementation mediate strategic leadership. Thus, this study investigated the influence of strategic leadership on the performance of SMEs as mediated by strategy implementation in Nelson Mandela Bay (NMB). A detailed theoretical investigation was conducted on the nature and role of strategic leadership, strategy implementation, and business performance of SMEs. Strategic leadership represents the independent variables of this study, namely: strategic direction, balanced organisational controls, organisational culture, organisation’s resource portfolio, and ethical practice, followed by the mediating variable (strategy implementation) and the dependent variable (business performance). An empirical investigation was also conducted to test the significant influence between these variables. This study adopted a positivistic approach using a quantitative research method. The sample size of the study was 390 respondents. Self-developed and structured questionnaires were physically distributed to 315 SME owners and managers in NMB using a convenience sampling method. Only 229 returned questionnaires were suitable and relevant to this study; thus, a 72.69% response rate was achieved. Returned questionnaires were cleansed, coded, and transferred to a statistical data analysis software called Statistica, version 14.0, for quantitative data analyses. The validity and reliability of the measuring instrument were confirmed using Exploratory Factor Analysis and the calculation of Cronbach’s alpha coefficients. Descriptive statistics was calculated to summarise the empirical data on demographic variables and the main variables of this study. Pearson’s correlations were calculated to determine the correlations between the main variables of this study, and the results confirmed that there is a positive influence between strategic leadership, strategy implementation, and business performance of SMEs. A multiple linear regression analysis was conducted to test the significance of the influence between the main variables of the study. A regression analysis outcome revealed that some of the strategic leadership activities (strategic direction, balanced organisational controls, and organisational culture) have a statistically significant positive influence on the business performance of SMEs. Furthermore, a statistically significant positive influence does exist between strategy implementation and business performance of SMEs. This study’s recommendations were suggested to SME owners/managers. Firstly, to formulate and develop a clear long-term vision of the business for the next 3 to 5 years. Align resources to key areas of business operation and set internal controls that will help set standards of desired performance and ultimately achieve them. Secondly, to formulate and implement shared values that connect employees to the business purpose and the way it is conducted. These shared values must be underpinned by a unique, valuable, and incomparable culture against competitors to gain a competitive edge. Furthermore, consider using rewards to recognise employees who embody the shared values of the business and are committed to the success of the business because of its culture. Thirdly, ensure both strategic and financial controls support strategy implementation and guide employees to achieve performance objectives. Use balanced scorecards to assess the effectiveness of controls in the business and put corrective measures to address performance gaps. Last but not least, invest in staff development and training, technological infrastructure, and set sound processes and systems for the business operation, establish structures that have clear lines of reporting, authority, and delegation. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
The private collection: aura, the cult of celebrity and, the construct of value in saleable works of art
- Authors: Ellis, Yvette Tamsin
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434574 , vital:73086
- Description: A tenet of the twenty-first century is the monetisation of everything due to commercialisation. The effects of this commercialisation have crept into every aspect of our lives, and although in the art world it has mostly been underhanded in its adoption, the traces of commercialisations touch are still evident in its functioning. Due to this underhandedness there hasn't been much thought put into what 'the monetisation of everything' truly implies for the industry, or how the value of the art object devoted to commercialisation may look like. The Private Collection (exhibition title of the practical component for submission in MFA completion) addresses the concept of object value and, more specifically, how that value is created within the art world through mechanisms of commercialisation that include celebrity cult, functioning of possession (through collecting), and taste. Research into Walter Benjamin's theory of the authenticity of the work of art, and in particular his concept of "aura," has helped inform the creation of a marketing strategy propelled by value driven mechanisms found within the Art Market for The Private Collection. Particular emphasis is placed on how brand value drives sales in this thesis. Thus, The Private Collection: Aura, the Cult of Celebrity, and the Construct of Value in Saleable Works of Art, defines The Private Collection as a tailored system built expressly for engagement with economic forces inside the art industry. As a result, the position of this study is based on the marketability of the object through particular driving forces that have seeped into the value system of the saleable work of art. The position of this thesis is that in this commercialist system, driving forces of value can be sustained within instances of the multiple. The project additionally supports this in maintaining that interaction from a fine art perspective would be limited if restricted to orthodox approaches (a gallery showing, and one print works), which is why a more economically interactive approach (e-commerce) was decided on for the exhibition component. The Private Collection offers an observation that the worth of a saleable work of art has become a warped representation of the commercial context we find ourselves in and that value is only awarded through particular kingmakers of the system. The practical component of this submission can be viewed online by clicking the image below. Please note that the website is not optimised for phone or tablet use, please instead view it on a computer (preferably a desktop) in full screen mode. , Thesis (MFA) -- Faculty of Humanities, Fine Art, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Ellis, Yvette Tamsin
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434574 , vital:73086
- Description: A tenet of the twenty-first century is the monetisation of everything due to commercialisation. The effects of this commercialisation have crept into every aspect of our lives, and although in the art world it has mostly been underhanded in its adoption, the traces of commercialisations touch are still evident in its functioning. Due to this underhandedness there hasn't been much thought put into what 'the monetisation of everything' truly implies for the industry, or how the value of the art object devoted to commercialisation may look like. The Private Collection (exhibition title of the practical component for submission in MFA completion) addresses the concept of object value and, more specifically, how that value is created within the art world through mechanisms of commercialisation that include celebrity cult, functioning of possession (through collecting), and taste. Research into Walter Benjamin's theory of the authenticity of the work of art, and in particular his concept of "aura," has helped inform the creation of a marketing strategy propelled by value driven mechanisms found within the Art Market for The Private Collection. Particular emphasis is placed on how brand value drives sales in this thesis. Thus, The Private Collection: Aura, the Cult of Celebrity, and the Construct of Value in Saleable Works of Art, defines The Private Collection as a tailored system built expressly for engagement with economic forces inside the art industry. As a result, the position of this study is based on the marketability of the object through particular driving forces that have seeped into the value system of the saleable work of art. The position of this thesis is that in this commercialist system, driving forces of value can be sustained within instances of the multiple. The project additionally supports this in maintaining that interaction from a fine art perspective would be limited if restricted to orthodox approaches (a gallery showing, and one print works), which is why a more economically interactive approach (e-commerce) was decided on for the exhibition component. The Private Collection offers an observation that the worth of a saleable work of art has become a warped representation of the commercial context we find ourselves in and that value is only awarded through particular kingmakers of the system. The practical component of this submission can be viewed online by clicking the image below. Please note that the website is not optimised for phone or tablet use, please instead view it on a computer (preferably a desktop) in full screen mode. , Thesis (MFA) -- Faculty of Humanities, Fine Art, 2024
- Full Text:
- Date Issued: 2024-04-03
The relationship between Environmental, Social, Governance (ESG) and Corporate Financial Performance (CFP)
- Authors: Bendeman, Justin John
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434701 , vital:73097
- Description: Restricted access. Expected release date 2025. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Bendeman, Justin John
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434701 , vital:73097
- Description: Restricted access. Expected release date 2025. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
- Full Text:
- Date Issued: 2024-04-03
The relationship between leadership and employee engagement in an automotive original equipment manufacturer in South Africa
- Authors: Slater, Bronwyn Lereen
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434756 , vital:73102
- Description: The manufacturing industry is one of the greatest contributors to the South African economy. Owing to a competitive and complex automotive climate, it is suggested that only a few automotive manufacturing organisations will remain viable in the coming years, without the optimal reliance on human capital resources to navigate an unpredictable and unfolding landscape. In securing a sustainable future, the engagement of these human capital resources is necessitated. This competitive landscape has resulted in the call for adaptive and flexible leadership. Leadership behaviour is categorised into three streams, namely, transformational leadership, transactional leadership, and non-leadership, which is referred to as laissez-faire leadership. Employee engagement is defined as the extent to which an employee is committed to, and involved in, their operational function and the organisation, whilst portraying a willingness to perform and contribute beyond that which is expected of them. The purpose of this research was to explore the relationship between leadership and employee engagement in an Original Equipment Manufacturer (OEM) in South Africa. This OEM operates in the Eastern Cape and Gauteng Provinces of South Africa. Globally, the OEM launched a leadership journey to facilitate a shared value system that supported a vision towards organisational success, by focusing on transformed ways of working and acting, as a global collective team. The outcome of this desired journey yielded eight Leadership Principles. These Leadership Principles are referred to, and included in the research study, to gain a more robust internal perspective of the leadership behaviours that are most advocated within the OEM, in relation to employee engagement. The objective of this research therefore was to establish the relationship between leadership and employee engagement in the respective OEM, by investigating the impact of transformational leadership and transactional leadership on employee engagement. A triangulation approach was adopted to analyse the data, using a combination of qualitative and quantitative research methodologies. The result when testing the reliability coefficient scores of the leadership instrument described a poor measure for transactional leadership, and a good measure for transformational leadership. Therefore, the results that stemmed from the statistical analysis in relation to transactional leadership could not be trusted. However, in the context of this research, it was found that there is a statistically significant relationship between transformational leadership and employee engagement. Whilst utilising the qualitative research methodology, it was found that there is a limited definition-based relationship between transactional leadership and the eight Leadership Principles. However, there is a definition-based relationship between the Leadership Principles and transformational leadership, owing to similarities found in the definition descriptions between at least six of the eight Leadership Principles. In the investigation of whether there is a definition-based relationship between the Leadership Principles and employee engagement, it was found that a limited definition-based relationship between the eight Leadership Principles and engagement existed. The research therefore met its objectives in determining a relationship between leadership and employee engagement in an Original Equipment Manufacturer in South Africa. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Slater, Bronwyn Lereen
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434756 , vital:73102
- Description: The manufacturing industry is one of the greatest contributors to the South African economy. Owing to a competitive and complex automotive climate, it is suggested that only a few automotive manufacturing organisations will remain viable in the coming years, without the optimal reliance on human capital resources to navigate an unpredictable and unfolding landscape. In securing a sustainable future, the engagement of these human capital resources is necessitated. This competitive landscape has resulted in the call for adaptive and flexible leadership. Leadership behaviour is categorised into three streams, namely, transformational leadership, transactional leadership, and non-leadership, which is referred to as laissez-faire leadership. Employee engagement is defined as the extent to which an employee is committed to, and involved in, their operational function and the organisation, whilst portraying a willingness to perform and contribute beyond that which is expected of them. The purpose of this research was to explore the relationship between leadership and employee engagement in an Original Equipment Manufacturer (OEM) in South Africa. This OEM operates in the Eastern Cape and Gauteng Provinces of South Africa. Globally, the OEM launched a leadership journey to facilitate a shared value system that supported a vision towards organisational success, by focusing on transformed ways of working and acting, as a global collective team. The outcome of this desired journey yielded eight Leadership Principles. These Leadership Principles are referred to, and included in the research study, to gain a more robust internal perspective of the leadership behaviours that are most advocated within the OEM, in relation to employee engagement. The objective of this research therefore was to establish the relationship between leadership and employee engagement in the respective OEM, by investigating the impact of transformational leadership and transactional leadership on employee engagement. A triangulation approach was adopted to analyse the data, using a combination of qualitative and quantitative research methodologies. The result when testing the reliability coefficient scores of the leadership instrument described a poor measure for transactional leadership, and a good measure for transformational leadership. Therefore, the results that stemmed from the statistical analysis in relation to transactional leadership could not be trusted. However, in the context of this research, it was found that there is a statistically significant relationship between transformational leadership and employee engagement. Whilst utilising the qualitative research methodology, it was found that there is a limited definition-based relationship between transactional leadership and the eight Leadership Principles. However, there is a definition-based relationship between the Leadership Principles and transformational leadership, owing to similarities found in the definition descriptions between at least six of the eight Leadership Principles. In the investigation of whether there is a definition-based relationship between the Leadership Principles and employee engagement, it was found that a limited definition-based relationship between the eight Leadership Principles and engagement existed. The research therefore met its objectives in determining a relationship between leadership and employee engagement in an Original Equipment Manufacturer in South Africa. , Thesis (MCom) -- Faculty of Commerce, Management, 2024
- Full Text:
- Date Issued: 2024-04-03
The Zimbabwe National Gender Policy (NGP) 2013–2017 and Women’s Economic Empowerment (WEE): a study of small-scale gold miners in the Bubi and Gwanda rural districts, Zimbabwe
- Moyo, Phoebe Michelle Zibusiso Sandi
- Authors: Moyo, Phoebe Michelle Zibusiso Sandi
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434638 , vital:73092 , DOI 10.21504/10962/434638
- Description: The study examines the impact of Zimbabwe’s second National Gender Policy (NGP) 2013-2017 under the Ministry of Women’s Affairs, Gender and Community Development on women’s access to and control over productive resources in the artisanal and small-scale gold mining sector in Bubi and Gwanda rural districts of Zimbabwe. Despite the implementation of the NGP over the past fourteen years, its effect on the economic empowerment of women has not been investigated adequately. Women’s economic empowerment (WEE) is recognized as a crucial development strategy. However, it faces challenges related to the tensions between structure and agency. Some perceive WEE as an entrepreneurial concept focusing on equal access and control over productive resources like credit, equipment, skills, and business training. Others argue that WEE should encompass more than just resource access and control by addressing structural factors that hinder women’s agency e.g. unequal social relations between men and women, patriarchy, unpaid care work, and sociocultural norms. The study employed a hybrid lens, combining structure and agency to analyse the implementation of the NGP’s empowerment programs. Drawing on Kabeer’s (1994) Social Relations Approach (SRA), the study utilized two key concepts from the SRA, namely social relations and institutional analysis, to examine the interaction between the NGP and various institutions (market, community, and family) where women are located. To gain a comprehensive understanding of the ways in which the NGP has supported or impeded WEE among the female small-scale gold miners in Bubi and Gwanda, a qualitative approach was employed as an investigative method. The findings indicated that the NGP adopts a liberal or agency centred approach to WEE. This approach emphasizes women’s agency and their ability to fulfil their potential in the public sphere. The NGP has facilitated access to credit, equipment, skills, and business training. However, the evidence also highlighted the uneven implementation of the NGP’s empowerment programs between the Bubi and Gwanda districts. Overall, the evidence revealed that, while the NGP has addressed gender inequalities to a limited degree, it has also reinforced class inequalities. The NGP’s empowerment programs have overlooked the structural factors that keep women in subordinate positions, such as the unequal social relations that exist between men and women, patriarchy, unpaid care work and sociocultural norms. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Moyo, Phoebe Michelle Zibusiso Sandi
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/434638 , vital:73092 , DOI 10.21504/10962/434638
- Description: The study examines the impact of Zimbabwe’s second National Gender Policy (NGP) 2013-2017 under the Ministry of Women’s Affairs, Gender and Community Development on women’s access to and control over productive resources in the artisanal and small-scale gold mining sector in Bubi and Gwanda rural districts of Zimbabwe. Despite the implementation of the NGP over the past fourteen years, its effect on the economic empowerment of women has not been investigated adequately. Women’s economic empowerment (WEE) is recognized as a crucial development strategy. However, it faces challenges related to the tensions between structure and agency. Some perceive WEE as an entrepreneurial concept focusing on equal access and control over productive resources like credit, equipment, skills, and business training. Others argue that WEE should encompass more than just resource access and control by addressing structural factors that hinder women’s agency e.g. unequal social relations between men and women, patriarchy, unpaid care work, and sociocultural norms. The study employed a hybrid lens, combining structure and agency to analyse the implementation of the NGP’s empowerment programs. Drawing on Kabeer’s (1994) Social Relations Approach (SRA), the study utilized two key concepts from the SRA, namely social relations and institutional analysis, to examine the interaction between the NGP and various institutions (market, community, and family) where women are located. To gain a comprehensive understanding of the ways in which the NGP has supported or impeded WEE among the female small-scale gold miners in Bubi and Gwanda, a qualitative approach was employed as an investigative method. The findings indicated that the NGP adopts a liberal or agency centred approach to WEE. This approach emphasizes women’s agency and their ability to fulfil their potential in the public sphere. The NGP has facilitated access to credit, equipment, skills, and business training. However, the evidence also highlighted the uneven implementation of the NGP’s empowerment programs between the Bubi and Gwanda districts. Overall, the evidence revealed that, while the NGP has addressed gender inequalities to a limited degree, it has also reinforced class inequalities. The NGP’s empowerment programs have overlooked the structural factors that keep women in subordinate positions, such as the unequal social relations that exist between men and women, patriarchy, unpaid care work and sociocultural norms. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2024
- Full Text:
- Date Issued: 2024-04-03
Tradition and change in the Imfene dance of the amaMpondo in the Ntabankulu district of the Eastern Cape province
- Authors: Mtsini, Nontuthuzelo
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434791 , vital:73105
- Description: Access restricted. Expected release 2025. , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Mtsini, Nontuthuzelo
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434791 , vital:73105
- Description: Access restricted. Expected release 2025. , Thesis (MMus) -- Faculty of Humanities, Music and Musicology, 2024
- Full Text:
- Date Issued: 2024-04-03
Yield curve and business cycle dynamics in South Africa: new evidence from a Markov switching model
- Authors: Rotich, Mercyline Chepkemoi
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434739 , vital:73101
- Description: Globally, several empirical studies have demonstrated the ability of the yield spread to predict a recession in a country. In South Africa, previous studies have not only shown the yield curve's predictive power but have further demonstrated that it outperforms other commonly used variables, such as the growth rate of real money supply, changes in stock prices, and the index of leading economic indicators. However, some recent studies have shown that the yield spread (the spread between 10-year bonds and 3-month Treasury bills) gave false signals of recession. In this study, we explore the possible reasons for the false signals of the yield spread by addressing the following questions. Does the yield spread used matter? Does the measure of the business cycle used matter? And do the estimation techniques used matter? To address the first question, unlike the previous studies, this paper uses four different yield spreads- depicting short-term, medium-term, and long-term government bonds against the backdrop of a changing structure of bond holding, which reflects the increasing risk eversion of investors in South Africa. Second, the paper used different measures of business cycles, namely industrial production index, lagging, coincident, and leading economic indicators. The empirical models were estimated using both univariate and multivariate Markov switching models. As economic theory suggests, the univariate Markov switching model was used to determine if each variable exhibits a significant regime switching. The multivariate Markov switching model was estimated for each business cycle and yield spread variable, with each of the other variables serving as a non-switching explanatory variable, thereby addressing potential endogeneity concerns and the predictive power of the explanatory variable. Finally, the multivariate Markov switching model was estimated for three monthly sample periods, a full sample for 1986 to 2022, and two sub-samples – 1986 to 2009 and 2010 to 2022. This analysis consistently reveals significant regime-switching behavior across all the series thus, affirming the superiority of the regime switching model over the standard model used in previous studies. By analyzing the transition probabilities and the expected durations between these regimes, we find that including the spreads in the business cycle model improves the models’ predictability, with the medium-term bonds spread performing better than the usual long-term spread. The smoothed regime probability of the best-performing models is compared with the SARB recession dates; the two closely resemble each other, proving that the Markov switching model can help predict the turning points in the business cycle in South Africa. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
- Full Text:
- Date Issued: 2024-04-03
- Authors: Rotich, Mercyline Chepkemoi
- Date: 2024-04-03
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/434739 , vital:73101
- Description: Globally, several empirical studies have demonstrated the ability of the yield spread to predict a recession in a country. In South Africa, previous studies have not only shown the yield curve's predictive power but have further demonstrated that it outperforms other commonly used variables, such as the growth rate of real money supply, changes in stock prices, and the index of leading economic indicators. However, some recent studies have shown that the yield spread (the spread between 10-year bonds and 3-month Treasury bills) gave false signals of recession. In this study, we explore the possible reasons for the false signals of the yield spread by addressing the following questions. Does the yield spread used matter? Does the measure of the business cycle used matter? And do the estimation techniques used matter? To address the first question, unlike the previous studies, this paper uses four different yield spreads- depicting short-term, medium-term, and long-term government bonds against the backdrop of a changing structure of bond holding, which reflects the increasing risk eversion of investors in South Africa. Second, the paper used different measures of business cycles, namely industrial production index, lagging, coincident, and leading economic indicators. The empirical models were estimated using both univariate and multivariate Markov switching models. As economic theory suggests, the univariate Markov switching model was used to determine if each variable exhibits a significant regime switching. The multivariate Markov switching model was estimated for each business cycle and yield spread variable, with each of the other variables serving as a non-switching explanatory variable, thereby addressing potential endogeneity concerns and the predictive power of the explanatory variable. Finally, the multivariate Markov switching model was estimated for three monthly sample periods, a full sample for 1986 to 2022, and two sub-samples – 1986 to 2009 and 2010 to 2022. This analysis consistently reveals significant regime-switching behavior across all the series thus, affirming the superiority of the regime switching model over the standard model used in previous studies. By analyzing the transition probabilities and the expected durations between these regimes, we find that including the spreads in the business cycle model improves the models’ predictability, with the medium-term bonds spread performing better than the usual long-term spread. The smoothed regime probability of the best-performing models is compared with the SARB recession dates; the two closely resemble each other, proving that the Markov switching model can help predict the turning points in the business cycle in South Africa. , Thesis (MCom) -- Faculty of Commerce, Economics and Economic History, 2024
- Full Text:
- Date Issued: 2024-04-03
Assessing rural senior primary school natural science teachers’ TPACK: a case study
- Authors: Silvanus, Secilia Tulikefo
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423902 , vital:72103
- Description: In today's world, technology has changed how people live and behave. The influence of technology contemplates a similar change in the education processes of teaching and learning. Many governments worldwide invest hugely in providing technological tools and facilities and training teachers to improve teaching and learning. The availability and access to technologies in schools seem to offer teachers opportunities to develop technological knowledge and integrate technology into teaching. Literature indicates that teachers must possess technological pedagogical content knowledge (TPACK) to integrate technology into teaching and learning processes effectively. However, other scholars have also suggested that teachers' TPACK develops and is shaped by many contexts. This study, therefore, sought to assess the rural senior primary Natural science teachers' TPACK. This qualitative case study was conducted with senior primary Natural science teachers in the educational circuit of Endola. An interpretive paradigm underpinned the study. The study employed semi-structured questionnaires, semi-structured interviews, focus group interviews, and observation to collect the data. The study used the TPACK as a theoretical and analytical framework. The study results showed that participants had a firmer grasp of subject content (CK) and traditional teaching methods (Pedagogical Knowledge - PK and Pedagogical Content Knowledge - PCK) compared to technological knowledge (TK) and technology-based pedagogies (Technological Pedagogical Knowledge - TPK, Technological Content Knowledge - TCK, and Technological Pedagogical Content Knowledge (TPCK). Findings support that the participants draw upon sources of Technological Pedagogical Content Knowledge (TPACK) closely aligned with Content Knowledge (CK), Technological Content Knowledge (TCK), and Technological Pedagogical Knowledge (TPK) to integrate technology. The study included inadequate professional development, teachers' attitudes, insufficient hardware and internet connectivity, limited technological knowledge, time constraints, and restricted access to technology tools and resources as obstacles for teachers attempting to incorporate technology into their classrooms effectively. Furthermore, the data highlights ICT training and teachers' interest as enablers that motivated participants to integrate technology into their teaching practices. Therefore, the study recommends professional development programs focusing on providing science teachers with practical skills to utilise different technologies and address common technical issues. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Silvanus, Secilia Tulikefo
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423902 , vital:72103
- Description: In today's world, technology has changed how people live and behave. The influence of technology contemplates a similar change in the education processes of teaching and learning. Many governments worldwide invest hugely in providing technological tools and facilities and training teachers to improve teaching and learning. The availability and access to technologies in schools seem to offer teachers opportunities to develop technological knowledge and integrate technology into teaching. Literature indicates that teachers must possess technological pedagogical content knowledge (TPACK) to integrate technology into teaching and learning processes effectively. However, other scholars have also suggested that teachers' TPACK develops and is shaped by many contexts. This study, therefore, sought to assess the rural senior primary Natural science teachers' TPACK. This qualitative case study was conducted with senior primary Natural science teachers in the educational circuit of Endola. An interpretive paradigm underpinned the study. The study employed semi-structured questionnaires, semi-structured interviews, focus group interviews, and observation to collect the data. The study used the TPACK as a theoretical and analytical framework. The study results showed that participants had a firmer grasp of subject content (CK) and traditional teaching methods (Pedagogical Knowledge - PK and Pedagogical Content Knowledge - PCK) compared to technological knowledge (TK) and technology-based pedagogies (Technological Pedagogical Knowledge - TPK, Technological Content Knowledge - TCK, and Technological Pedagogical Content Knowledge (TPCK). Findings support that the participants draw upon sources of Technological Pedagogical Content Knowledge (TPACK) closely aligned with Content Knowledge (CK), Technological Content Knowledge (TCK), and Technological Pedagogical Knowledge (TPK) to integrate technology. The study included inadequate professional development, teachers' attitudes, insufficient hardware and internet connectivity, limited technological knowledge, time constraints, and restricted access to technology tools and resources as obstacles for teachers attempting to incorporate technology into their classrooms effectively. Furthermore, the data highlights ICT training and teachers' interest as enablers that motivated participants to integrate technology into their teaching practices. Therefore, the study recommends professional development programs focusing on providing science teachers with practical skills to utilise different technologies and address common technical issues. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
Exploring senior phase teachers’ use of kahoot! Gamification as a formative assessment tool to scaffold mathematical understanding
- Authors: Balele, Silence
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423891 , vital:72102
- Description: In South Africa, digital technology, particularly gamification, continues to become an important teaching and learning tool. Its importance lies in scaffolding mathematical understanding, improving the quality of assessment, and developing twenty-first-century technological skills for effective mathematics assessment. To explore this importance, senior phase mathematics teachers are encouraged to adopt gamification technology such as Kahoot! in assessment. The study adopted a case study research design with a interpretivist research paradigm, as this method allows detailed exploration and understanding of a specific context through a close connection with the participants. Data was collected using semi-structured questionnaires, focus group interviews, non-participant observations, and reflective journals. The research involved ten purposively selected senior-phase mathematics teachers from two schools in the Sarah Baartman District, Eastern Cape Province, South Africa. The study drew upon Vygoysky's Sociocultural Theory for its theoretical framework, while the Technological, Pedagogical, and Content Knowledge was used for analysis. The data analysis pursued an inductive approach. Adopting a thematic analysis included coding participant responses, organizing codes into concepts and categories, and developing a theoretical framework from the resultant categories. A four-phase process was involved: coding, conceptualizing, categorizing, and theorizing, was employed. This process and using NVivo software for data organization and management helped identify patterns, themes, and significant concerns surrounding the study's core subject. The findings from the study were as follows: Firstly, it was revealed that most teachers have a positive perception and attitude towards using Kahoot! for formative assessment, believing that it enhances teaching and learning quality. However, they showed scepticism due to insufficient Information and Communication Technologies knowledge and training. Second, teachers' pedagogical and technological experiences were predominantly enjoyable. Kahoot! was accepted as beneficial for promoting collaboration, interaction, and immediate feedback. Third, the study identified enabling and constraining factors in using Kahoot! for formative assessment. The enabling factors include Kahoot!, which was convenient and accessible, promoted immediate feedback and fostered collaboration and interaction. The constraining factors include Information and Communication Technologies and network interference, which posed limitations. The research concluded that Kahoot! as a platform for formative assessment indeed scaffold mathematical understanding. The study recommends increasing teachers' access to educational technology, incorporating continuous professional development programs, providing subject-specific training, and encouraging teachers to adapt to emerging technologies. The study also provided recommendations for future research to explore learner perceptions, employ a mixed methods approach to help quantify learner performance and investigate the pedagogical and technological experiences of senior phase mathematics teachers regarding formative assessment. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Balele, Silence
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423891 , vital:72102
- Description: In South Africa, digital technology, particularly gamification, continues to become an important teaching and learning tool. Its importance lies in scaffolding mathematical understanding, improving the quality of assessment, and developing twenty-first-century technological skills for effective mathematics assessment. To explore this importance, senior phase mathematics teachers are encouraged to adopt gamification technology such as Kahoot! in assessment. The study adopted a case study research design with a interpretivist research paradigm, as this method allows detailed exploration and understanding of a specific context through a close connection with the participants. Data was collected using semi-structured questionnaires, focus group interviews, non-participant observations, and reflective journals. The research involved ten purposively selected senior-phase mathematics teachers from two schools in the Sarah Baartman District, Eastern Cape Province, South Africa. The study drew upon Vygoysky's Sociocultural Theory for its theoretical framework, while the Technological, Pedagogical, and Content Knowledge was used for analysis. The data analysis pursued an inductive approach. Adopting a thematic analysis included coding participant responses, organizing codes into concepts and categories, and developing a theoretical framework from the resultant categories. A four-phase process was involved: coding, conceptualizing, categorizing, and theorizing, was employed. This process and using NVivo software for data organization and management helped identify patterns, themes, and significant concerns surrounding the study's core subject. The findings from the study were as follows: Firstly, it was revealed that most teachers have a positive perception and attitude towards using Kahoot! for formative assessment, believing that it enhances teaching and learning quality. However, they showed scepticism due to insufficient Information and Communication Technologies knowledge and training. Second, teachers' pedagogical and technological experiences were predominantly enjoyable. Kahoot! was accepted as beneficial for promoting collaboration, interaction, and immediate feedback. Third, the study identified enabling and constraining factors in using Kahoot! for formative assessment. The enabling factors include Kahoot!, which was convenient and accessible, promoted immediate feedback and fostered collaboration and interaction. The constraining factors include Information and Communication Technologies and network interference, which posed limitations. The research concluded that Kahoot! as a platform for formative assessment indeed scaffold mathematical understanding. The study recommends increasing teachers' access to educational technology, incorporating continuous professional development programs, providing subject-specific training, and encouraging teachers to adapt to emerging technologies. The study also provided recommendations for future research to explore learner perceptions, employ a mixed methods approach to help quantify learner performance and investigate the pedagogical and technological experiences of senior phase mathematics teachers regarding formative assessment. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
Technological Pedagogical Content Knowledge (TPACK): investigating senior primary mathematics teachers’ integration of technology in the classroom in Okahao educational circuit
- Shikesho, Hilya Ndahambelela
- Authors: Shikesho, Hilya Ndahambelela
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423913 , vital:72104
- Description: The overwhelming advancement of ICT devices in the contemporary Namibian education system has led to their praise for supporting differentiated instruction, fostering collaboration, and engaging multiple intelligences in teaching and learning. Consequently, the compulsory incorporation of ICTs into the teaching and learning process becomes imperative across various fields of study, including Mathematics. However, the integration of technology-based teaching proves to be a complex and challenging issue, often considered a wicked problem. To explore this matter, a qualitative case study was conducted to investigate how Senior Primary Mathematics Teachers integrated technology to develop their TPACK. The study was conducted among the twenty-seven senior primary mathematics teachers in the Okahao educational circuit in the Omuasti region. The study utilized Vygotsky‘s (1978); Socio-cultural Theory, together with Mishra and Koehler (2006), and; the Technological Pedagogical Content Knowledge (TPACK) framework was used as a lens to analyse the data. The data were gathered through semi-structured questionnaires, semi-structured interviews, focus group interviews, and lesson observations. The study findings indicate that senior primary mathematics teachers utilize the available resources at their respective schools during their classroom instruction. The study further reveals that mathematics teachers exhibit a positive attitude toward the integration of technology. The study uncovers the intricate interplay between technological knowledge, pedagogical expertise, and content knowledge within the context of mathematics education. The findings reveal that while participants demonstrate a high level of proficiency in certain TPACK components such as CK, TK, PK, TPK, and PCK, they expressed a moderate level of expertise in TCK and TPCK. The study also identified challenges in TPACK development, particularly the need for subject specific technology training, lack of technological infrastructure, particularly advanced technology, as well as a deficiency in ICT knowledge. The importance of access to various technologies was emphasized, enabling teachers to seamlessly integrate technology into their practices and address diverse learning styles. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Shikesho, Hilya Ndahambelela
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423913 , vital:72104
- Description: The overwhelming advancement of ICT devices in the contemporary Namibian education system has led to their praise for supporting differentiated instruction, fostering collaboration, and engaging multiple intelligences in teaching and learning. Consequently, the compulsory incorporation of ICTs into the teaching and learning process becomes imperative across various fields of study, including Mathematics. However, the integration of technology-based teaching proves to be a complex and challenging issue, often considered a wicked problem. To explore this matter, a qualitative case study was conducted to investigate how Senior Primary Mathematics Teachers integrated technology to develop their TPACK. The study was conducted among the twenty-seven senior primary mathematics teachers in the Okahao educational circuit in the Omuasti region. The study utilized Vygotsky‘s (1978); Socio-cultural Theory, together with Mishra and Koehler (2006), and; the Technological Pedagogical Content Knowledge (TPACK) framework was used as a lens to analyse the data. The data were gathered through semi-structured questionnaires, semi-structured interviews, focus group interviews, and lesson observations. The study findings indicate that senior primary mathematics teachers utilize the available resources at their respective schools during their classroom instruction. The study further reveals that mathematics teachers exhibit a positive attitude toward the integration of technology. The study uncovers the intricate interplay between technological knowledge, pedagogical expertise, and content knowledge within the context of mathematics education. The findings reveal that while participants demonstrate a high level of proficiency in certain TPACK components such as CK, TK, PK, TPK, and PCK, they expressed a moderate level of expertise in TCK and TPCK. The study also identified challenges in TPACK development, particularly the need for subject specific technology training, lack of technological infrastructure, particularly advanced technology, as well as a deficiency in ICT knowledge. The importance of access to various technologies was emphasized, enabling teachers to seamlessly integrate technology into their practices and address diverse learning styles. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
Systematic effects and mitigation strategies in observations of cosmic re-ionisation with the Hydrogen Epoch of Reionization Array
- Authors: Charles, Ntsikelelo
- Date: 2024
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432605 , vital:72886 , DOI 10.21504/10962/432605
- Description: The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). It has driven the construction of the new generation of lowfrequency radio interferometric arrays, including the Hydrogen Epoch of Reionization Array (HERA). The main difficulty in measuring the 21 cm signal is the presence of bright foregrounds that require very accurate interferometric calibration. However, the non-smooth instrumental response of the antenna as a result of mutual coupling complicates the calibration process by introducing non-smooth calibration errors. Additionally, incomplete sky models are typically used in calibration due to the limited depth and resolution of current source catalogues. Combined with the instrumental response, the use of incomplete sky models during calibration can result in non-smooth calibration errors. These, overall, impart spectral structure on smooth foregrounds, leading to foreground power leakage into the EoR window. In this thesis we explored the use of fringe rate filters (Parsons et al., 2016) as a mean to mitigate calibration errors resulting from the effects of mutual coupling and the use of an incomplete sky model during calibration. We found that the use of a simple notch filter mitigates calibration errors reducing the foreground power leakage into the EoR window by a factor of ∼ 102. Thyagarajan et al. (2018) proposed the use of closure phase quantities as a means to detect the 21 cm signal, which has the advantage of being independent (to first order) from calibration errors and, therefore, bypasses the need for accurate calibration. In this thesis, we explore the impact of primary beam patterns affected by mutual coupling on the closure phase. We found that primary beams affected by mutual coupling lead to a leakage of foreground power into the EoR window, which can be up to ∼ 104 times and is mainly caused by the unsmooth spectral structure primary of primary beam sidelobes affected by mutual coupling. This power leakage was confined to k < 0.3 pseudo h Mpc−1. Lastly, we also proposed and demonstrated an analysis technique that can be used to derive a flux scale correction in post-calibrated HERA data. We found that after applying flux scale correction to calibrated HERA data, the bandpass error reduces significantly, with an improvement of 6%. The derived flux scale correction was antenna-independent, and it can be applied to fix the overall visibility spectrum scale of H4C data post-calibration in a fashion similar to Jacobs et al. (2013). , Thesis (PhD) -- Faculty of Science, Physics and Electronics, 2024
- Full Text:
- Date Issued: 2024
- Authors: Charles, Ntsikelelo
- Date: 2024
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432605 , vital:72886 , DOI 10.21504/10962/432605
- Description: The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). It has driven the construction of the new generation of lowfrequency radio interferometric arrays, including the Hydrogen Epoch of Reionization Array (HERA). The main difficulty in measuring the 21 cm signal is the presence of bright foregrounds that require very accurate interferometric calibration. However, the non-smooth instrumental response of the antenna as a result of mutual coupling complicates the calibration process by introducing non-smooth calibration errors. Additionally, incomplete sky models are typically used in calibration due to the limited depth and resolution of current source catalogues. Combined with the instrumental response, the use of incomplete sky models during calibration can result in non-smooth calibration errors. These, overall, impart spectral structure on smooth foregrounds, leading to foreground power leakage into the EoR window. In this thesis we explored the use of fringe rate filters (Parsons et al., 2016) as a mean to mitigate calibration errors resulting from the effects of mutual coupling and the use of an incomplete sky model during calibration. We found that the use of a simple notch filter mitigates calibration errors reducing the foreground power leakage into the EoR window by a factor of ∼ 102. Thyagarajan et al. (2018) proposed the use of closure phase quantities as a means to detect the 21 cm signal, which has the advantage of being independent (to first order) from calibration errors and, therefore, bypasses the need for accurate calibration. In this thesis, we explore the impact of primary beam patterns affected by mutual coupling on the closure phase. We found that primary beams affected by mutual coupling lead to a leakage of foreground power into the EoR window, which can be up to ∼ 104 times and is mainly caused by the unsmooth spectral structure primary of primary beam sidelobes affected by mutual coupling. This power leakage was confined to k < 0.3 pseudo h Mpc−1. Lastly, we also proposed and demonstrated an analysis technique that can be used to derive a flux scale correction in post-calibrated HERA data. We found that after applying flux scale correction to calibrated HERA data, the bandpass error reduces significantly, with an improvement of 6%. The derived flux scale correction was antenna-independent, and it can be applied to fix the overall visibility spectrum scale of H4C data post-calibration in a fashion similar to Jacobs et al. (2013). , Thesis (PhD) -- Faculty of Science, Physics and Electronics, 2024
- Full Text:
- Date Issued: 2024
A comprehensive review of the taxonomic diversity within the freshwater catfish genus Parauchenoglanis (Siluriformes, Auchenoglanididae)
- Authors: Sithole, Yonela
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/402992 , vital:69912
- Description: Thesis embargoed. To be released early 2026. , Thesis (PhD) -- Faculty of Science, Ichthyology & Fisheries Science, 2023
- Full Text:
- Date Issued: 2023-10-13
- Authors: Sithole, Yonela
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/402992 , vital:69912
- Description: Thesis embargoed. To be released early 2026. , Thesis (PhD) -- Faculty of Science, Ichthyology & Fisheries Science, 2023
- Full Text:
- Date Issued: 2023-10-13
A council of women
- Authors: Sobekwa, Lelethu Anathi
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/435988 , vital:73218
- Description: This thesis comprises extracts of life writing written in short prose forms. The work reads like a novella and I have been inspired by Margaret Patton Chapman’s approach to the novella, where she condenses “the telling of a long story time wise”, so that a story occurring over two years can be told over two pages. The thesis explores relationships between mother, daughter, grandmother and granddaughter, each with different life experiences and each teaching the next generation about how to navigate life as politically, socially and economically disadvantaged women. I have also drawn inspiration from authors such as NoViolet Bulawayo who explores the hypocrisies of the church and the government in We Need New Names. In Kate Bernheimer’s “Fairy Tale is Form, Form is Fairy Tale” she writes about fairy tales adopting “intuitive logic” or telling in the form of “this happens and then this happens” while the explanation behind the events is not spelt out but rather exists between the lines. My thesis adopts this style of writing by allowing the reader to understand what is being said without over-simplifying. To this end, I have used the concept of place modelled on Es’kia Mphahlele’s In Corner B, where characters are inscribed in relation to the spaces they inhabit. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2023
- Full Text:
- Date Issued: 2023-10-13
- Authors: Sobekwa, Lelethu Anathi
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/435988 , vital:73218
- Description: This thesis comprises extracts of life writing written in short prose forms. The work reads like a novella and I have been inspired by Margaret Patton Chapman’s approach to the novella, where she condenses “the telling of a long story time wise”, so that a story occurring over two years can be told over two pages. The thesis explores relationships between mother, daughter, grandmother and granddaughter, each with different life experiences and each teaching the next generation about how to navigate life as politically, socially and economically disadvantaged women. I have also drawn inspiration from authors such as NoViolet Bulawayo who explores the hypocrisies of the church and the government in We Need New Names. In Kate Bernheimer’s “Fairy Tale is Form, Form is Fairy Tale” she writes about fairy tales adopting “intuitive logic” or telling in the form of “this happens and then this happens” while the explanation behind the events is not spelt out but rather exists between the lines. My thesis adopts this style of writing by allowing the reader to understand what is being said without over-simplifying. To this end, I have used the concept of place modelled on Es’kia Mphahlele’s In Corner B, where characters are inscribed in relation to the spaces they inhabit. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2023
- Full Text:
- Date Issued: 2023-10-13
A formative evaluation and critical analysis of an alcohol and pregnancy intervention in the Eastern Cape of South Africa
- Authors: Graham, Nicola Susan Jearey
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432541 , vital:72879 , DOI 10.21504/10962/432541
- Description: Some communities in South Africa have the highest documented rates of Foetal Alcohol Spectrum Disorders (FASD) in the world. Interventions to reduce alcohol consumption during pregnancy are crucial, but evaluations of such interventions are sparse. Formative evaluations are indicated to assist in the development of interventions. Harmful alcohol consumption during pregnancy is undergirded by a range of social injustices, including those imposed by colonisation and patriarchy; a feminist, decolonial approach to evaluations is, therefore, important. A research project, consisting of three arms, examined alcohol use during pregnancy in an under-resourced urban area of the Eastern Cape, and this research was one of those arms. An intervention was being rolled out in this area and I gathered a range of data from it. I engaged in a formative evaluation of it, and I reflect on the difficulties that I encountered in this endeavour. In the bulk of this thesis, I examine the power apparatuses and technologies that were used during the intervention to discursively position pregnant women. My analysis was guided by Foucauldian and post-Foucauldian theories, using Foucauldian Discourse Analysis and simplified Conversation Analysis (CA). Power apparatuses of coloniality, patriarchy, and pastoral power were used in the intervention to construct positions for pregnant women who drink alcohol as ignorant children, sinners, criminals, or “Mommies”. The foetus was constructed as a precious, vulnerable baby, while the person with FASD was constructed as the defiled Other, responsible for societal dissolution. The intervention used various disciplinary techniques to exhort women to follow their dictates. Women were generally compliant with being positioned as ignorant children, which absolved them from any blame for pre-natal drinking. However, some resistance was evident. I then introduce an ethics of care and justice, and I argue that pregnant/newly parenting women need to be positioned within such an ethics, which acknowledges both the universal resources that they require for reproductive freedoms, as well as their particular care needs. I highlight the few times when women were positioned in this way in the data, and I look at how the common positions could be altered or expanded to promote such an ethics. I conclude by arguing that alcohol use during pregnancy cannot be separated from the larger context of the cultural hegemony of alcohol use in some communities, and the social injustices that potentiate this use. I provide suggestions for country-wide policies and interventions, as well as specific FASD prevention programmes, and I argue that a feminist decolonising approach, within an ethics of care and justice, should guide interventions at all levels. , Thesis (PhD) -- Faculty of Humanities, Psychology, 2023
- Full Text:
- Date Issued: 2023-10-13
- Authors: Graham, Nicola Susan Jearey
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432541 , vital:72879 , DOI 10.21504/10962/432541
- Description: Some communities in South Africa have the highest documented rates of Foetal Alcohol Spectrum Disorders (FASD) in the world. Interventions to reduce alcohol consumption during pregnancy are crucial, but evaluations of such interventions are sparse. Formative evaluations are indicated to assist in the development of interventions. Harmful alcohol consumption during pregnancy is undergirded by a range of social injustices, including those imposed by colonisation and patriarchy; a feminist, decolonial approach to evaluations is, therefore, important. A research project, consisting of three arms, examined alcohol use during pregnancy in an under-resourced urban area of the Eastern Cape, and this research was one of those arms. An intervention was being rolled out in this area and I gathered a range of data from it. I engaged in a formative evaluation of it, and I reflect on the difficulties that I encountered in this endeavour. In the bulk of this thesis, I examine the power apparatuses and technologies that were used during the intervention to discursively position pregnant women. My analysis was guided by Foucauldian and post-Foucauldian theories, using Foucauldian Discourse Analysis and simplified Conversation Analysis (CA). Power apparatuses of coloniality, patriarchy, and pastoral power were used in the intervention to construct positions for pregnant women who drink alcohol as ignorant children, sinners, criminals, or “Mommies”. The foetus was constructed as a precious, vulnerable baby, while the person with FASD was constructed as the defiled Other, responsible for societal dissolution. The intervention used various disciplinary techniques to exhort women to follow their dictates. Women were generally compliant with being positioned as ignorant children, which absolved them from any blame for pre-natal drinking. However, some resistance was evident. I then introduce an ethics of care and justice, and I argue that pregnant/newly parenting women need to be positioned within such an ethics, which acknowledges both the universal resources that they require for reproductive freedoms, as well as their particular care needs. I highlight the few times when women were positioned in this way in the data, and I look at how the common positions could be altered or expanded to promote such an ethics. I conclude by arguing that alcohol use during pregnancy cannot be separated from the larger context of the cultural hegemony of alcohol use in some communities, and the social injustices that potentiate this use. I provide suggestions for country-wide policies and interventions, as well as specific FASD prevention programmes, and I argue that a feminist decolonising approach, within an ethics of care and justice, should guide interventions at all levels. , Thesis (PhD) -- Faculty of Humanities, Psychology, 2023
- Full Text:
- Date Issued: 2023-10-13
A molecular investigation of stem-galling Tetramesa Walker (Hymenoptera: Eurytomidae) on African grasses: applications to biological control
- Van Steenderen, Clarke Julian Mignon
- Authors: Van Steenderen, Clarke Julian Mignon
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432565 , vital:72881 , DOI 10.21504/10962/432565
- Description: South Africa is a larger donor than receiver of alien grasses, where approximately 15% (_ 165 spp.) of the country's native grass species have become naturalised elsewhere. Many of these grasses have become serious invaders, causing significant damage to native species, habitat structure, and ecosystem functioning. Biological control is a sustainable and cost-effective method for the control of invasive weeds, but its application to invasive grasses has been approached with trepidation in the past due to the fears of a lack of host-specific herbivores that may cause non-target damage to agriculturally-important crops. The Tetramesa Walker genus (Hymenoptera: Eurytomidae) is one of three genera in the family that feed exclusively on grasses, and have a record of being host-specific to a particular species, or complex of closely-related congeners. There are over 200 described Tetramesa species, but this taxonomic effort has occurred almost exclusively in the Northern Hemisphere. Only about 2% of the described species are from Africa, with none from southern Africa despite the high diversity of grasses in the region. The low morphological variability between many Tetramesa groups has made identification difficult, where there may in fact be multiple undiscovered cryptic species. This thesis generated genetic sequence data (mitochondrial COI and nuclear 28S) that revealed at least eight native southern African Tetramesa taxa that are new to science, focusing particularly on the assemblages associated with Eragrostis curvula Nees (African lovegrass) and Sporobolus pyramidalis Beauv. and S. natalensis Steud. (giant rat's tail grass) which are alien invasive pests in Australia. Approximately 200 eurytomid wasps were collected and sequenced from 19 grass species across six South African provinces. Additionally, 27 grass species were sequenced using four gene regions (rps16-trnK, rps16, rpl32-trnL, and ITS), which were added to existing sequence data to build a dataset comprising over 700 sequences. Field host ranges and the use of host grass genetic proxies were important in making inferences about the host-specificity of eurytomid wasps of interest. Nine Tetramesa groups appeared to be host-specific to a single grass species, while six Tetramesa were associated with multiple species in a single grass genus. Since S. pyramidalis, S. natalensis, S. africanus, Hyparrhenia hirta, E. trichophora, and Andropogon gayanus are weeds elsewhere, there are at least six potential Tetramesa biological control agents that have been identified. A high diversity of Tetramesa on grasses within the Eragrostis genus was reported, with at least four taxa associated with E. curvula. It is currently uncertain whether these taxa represent different cryptic species or intraspecific populations that are the result of geographic sub-structuring. No-choice host-specificity testing using Tetramesa sp. 4 on E. curvula revealed that the wasp could complete its lifecycle on two non-target African grasses; namely E. plana and E. planiculmis. The wasp was also recorded on other Eragrostis species in the field (namely E. biflora and E. capensis). Using grass genetic sequences obtained in this study, it was found that there are four native Australian Eragrostis species that are more closely related to target E. curvula than to the non-target E. plana and E. planiculmis. This suggests that Tetramesa sp. 4 may not be suitably host-specific for use as a biological control agent. Further host-specificity testing on these native Australian species is required, however, before this insect is ruled out completely. The Tetramesa on S. pyramidalis (Tetramesa sp. 1), and the unidentified Sporobolus species presumed to be S. africanus, were suitably host-specific to be used as biological control agents. Since it was unclear whether some phylogenetic clades were true species or intraspecific populations, which is essential to understand when selecting agents for biological control, a new piece of software, SPEDE-sampler", was developed. It offers users of the Generalised Mixed Yule Coalescent (GMYC) species delimitation model a means of assessing the degree to which sampling effects such as data size and parameter choice can influence species diversity estimates. When applied to the Tetramesa data set, the software assisted in identifying which groups may contain cryptic species, uncovering that the COI marker is affected more by singletons than the 28S marker (i.e. species diversity tends to be overestimated), and confirming putative Tetramesa taxa that could be useful for biological control programmes going forward. This thesis has provided evidence that South Africa contains a diverse assemblage of Tetramesa and other eurytomids that are closely associated with their grass hosts, and that many of these taxa hold promise for grass biological control. This work has also highlighted the importance of integrative taxonomy in the discovery of novel taxa, and that biological control practitioners need to be aware of the caveats of each line of evidence used in the delimitation of putative species. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2023
- Full Text:
- Date Issued: 2023-10-13
- Authors: Van Steenderen, Clarke Julian Mignon
- Date: 2023-10-13
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/432565 , vital:72881 , DOI 10.21504/10962/432565
- Description: South Africa is a larger donor than receiver of alien grasses, where approximately 15% (_ 165 spp.) of the country's native grass species have become naturalised elsewhere. Many of these grasses have become serious invaders, causing significant damage to native species, habitat structure, and ecosystem functioning. Biological control is a sustainable and cost-effective method for the control of invasive weeds, but its application to invasive grasses has been approached with trepidation in the past due to the fears of a lack of host-specific herbivores that may cause non-target damage to agriculturally-important crops. The Tetramesa Walker genus (Hymenoptera: Eurytomidae) is one of three genera in the family that feed exclusively on grasses, and have a record of being host-specific to a particular species, or complex of closely-related congeners. There are over 200 described Tetramesa species, but this taxonomic effort has occurred almost exclusively in the Northern Hemisphere. Only about 2% of the described species are from Africa, with none from southern Africa despite the high diversity of grasses in the region. The low morphological variability between many Tetramesa groups has made identification difficult, where there may in fact be multiple undiscovered cryptic species. This thesis generated genetic sequence data (mitochondrial COI and nuclear 28S) that revealed at least eight native southern African Tetramesa taxa that are new to science, focusing particularly on the assemblages associated with Eragrostis curvula Nees (African lovegrass) and Sporobolus pyramidalis Beauv. and S. natalensis Steud. (giant rat's tail grass) which are alien invasive pests in Australia. Approximately 200 eurytomid wasps were collected and sequenced from 19 grass species across six South African provinces. Additionally, 27 grass species were sequenced using four gene regions (rps16-trnK, rps16, rpl32-trnL, and ITS), which were added to existing sequence data to build a dataset comprising over 700 sequences. Field host ranges and the use of host grass genetic proxies were important in making inferences about the host-specificity of eurytomid wasps of interest. Nine Tetramesa groups appeared to be host-specific to a single grass species, while six Tetramesa were associated with multiple species in a single grass genus. Since S. pyramidalis, S. natalensis, S. africanus, Hyparrhenia hirta, E. trichophora, and Andropogon gayanus are weeds elsewhere, there are at least six potential Tetramesa biological control agents that have been identified. A high diversity of Tetramesa on grasses within the Eragrostis genus was reported, with at least four taxa associated with E. curvula. It is currently uncertain whether these taxa represent different cryptic species or intraspecific populations that are the result of geographic sub-structuring. No-choice host-specificity testing using Tetramesa sp. 4 on E. curvula revealed that the wasp could complete its lifecycle on two non-target African grasses; namely E. plana and E. planiculmis. The wasp was also recorded on other Eragrostis species in the field (namely E. biflora and E. capensis). Using grass genetic sequences obtained in this study, it was found that there are four native Australian Eragrostis species that are more closely related to target E. curvula than to the non-target E. plana and E. planiculmis. This suggests that Tetramesa sp. 4 may not be suitably host-specific for use as a biological control agent. Further host-specificity testing on these native Australian species is required, however, before this insect is ruled out completely. The Tetramesa on S. pyramidalis (Tetramesa sp. 1), and the unidentified Sporobolus species presumed to be S. africanus, were suitably host-specific to be used as biological control agents. Since it was unclear whether some phylogenetic clades were true species or intraspecific populations, which is essential to understand when selecting agents for biological control, a new piece of software, SPEDE-sampler", was developed. It offers users of the Generalised Mixed Yule Coalescent (GMYC) species delimitation model a means of assessing the degree to which sampling effects such as data size and parameter choice can influence species diversity estimates. When applied to the Tetramesa data set, the software assisted in identifying which groups may contain cryptic species, uncovering that the COI marker is affected more by singletons than the 28S marker (i.e. species diversity tends to be overestimated), and confirming putative Tetramesa taxa that could be useful for biological control programmes going forward. This thesis has provided evidence that South Africa contains a diverse assemblage of Tetramesa and other eurytomids that are closely associated with their grass hosts, and that many of these taxa hold promise for grass biological control. This work has also highlighted the importance of integrative taxonomy in the discovery of novel taxa, and that biological control practitioners need to be aware of the caveats of each line of evidence used in the delimitation of putative species. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2023
- Full Text:
- Date Issued: 2023-10-13