The prevalence of insufficient iodine intake in pregnancy in Africa: Protocol for a systematic review and meta-analysis
- Charles Bitamazire Businge, Benjamin Longo-Mbenza, Andre Pascal Kengne
- Authors: Charles Bitamazire Businge , Benjamin Longo-Mbenza , Andre Pascal Kengne
- Date: 22-8-2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/3387 , vital:43338 , https://systematicreviewsjournal.biomedcentral.com/articles/10.1186/s13643-019-1092-7#citeas
- Description: Background: Insufficient iodine intake in pregnancy is associated with many adverse pregnancy outcomes. About 90% of African countries are at risk of iodine deficiency due to poor soils and dietary goitrogens. Pregnancy predisposes to insufficient iodine nutrition secondary to increased physiological demand and increased renal loss. Iodine deficiency is re-emerging in countries thought to be replete with pregnant women being the most affected. This review seeks to identify the degree of iodine nutrition in pregnancy on the entire African continent before and after the implementation of national iodization programmes. Methods: A systematic search of published literature will be conducted for observational studies that directly determined the prevalence of insufficient iodine intake among pregnant women in Africa. Electronic databases and grey literature will be searched for baseline data before the implementation of population-based iodine supplementation and for follow-up data up to December 2018. Screening of identified articles and data extraction will be conducted independently by two investigators. Risk of bias and methodological quality of the included studies will be assessed using a risk of bias tool. Appropriate meta-analytic techniques will be used to pool prevalence estimates from studies with similar features, overall and by major characteristics including the region of the study, time period (before and after implementation of iodization programmes), sample size and age. Heterogeneity of the estimates across studies will be quantified and publication bias investigated. This protocol is reported according to Preferred Reporting Items for Systematic reviews and Meta-Analysis protocols (PRISMA-P) 2015 guidelines. Discussion This review will help ascertain the impact of national iodization programmes on the iodine nutrition status in pregnancy in Africa and advise policy on the necessity for monitoring and mitigating iodine deficiency in pregnancy in Africa. This review is part of a thesis that will be submitted to the Faculty of Health Sciences, University of Cape Town, for the award of a PhD in Medicine whose protocol has been granted ethics approval (UCT HREC 135/2018). In addition, the results will be published in a peer-reviewed journal.
- Full Text:
- Date Issued: 22-8-2019
- Authors: Charles Bitamazire Businge , Benjamin Longo-Mbenza , Andre Pascal Kengne
- Date: 22-8-2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/3387 , vital:43338 , https://systematicreviewsjournal.biomedcentral.com/articles/10.1186/s13643-019-1092-7#citeas
- Description: Background: Insufficient iodine intake in pregnancy is associated with many adverse pregnancy outcomes. About 90% of African countries are at risk of iodine deficiency due to poor soils and dietary goitrogens. Pregnancy predisposes to insufficient iodine nutrition secondary to increased physiological demand and increased renal loss. Iodine deficiency is re-emerging in countries thought to be replete with pregnant women being the most affected. This review seeks to identify the degree of iodine nutrition in pregnancy on the entire African continent before and after the implementation of national iodization programmes. Methods: A systematic search of published literature will be conducted for observational studies that directly determined the prevalence of insufficient iodine intake among pregnant women in Africa. Electronic databases and grey literature will be searched for baseline data before the implementation of population-based iodine supplementation and for follow-up data up to December 2018. Screening of identified articles and data extraction will be conducted independently by two investigators. Risk of bias and methodological quality of the included studies will be assessed using a risk of bias tool. Appropriate meta-analytic techniques will be used to pool prevalence estimates from studies with similar features, overall and by major characteristics including the region of the study, time period (before and after implementation of iodization programmes), sample size and age. Heterogeneity of the estimates across studies will be quantified and publication bias investigated. This protocol is reported according to Preferred Reporting Items for Systematic reviews and Meta-Analysis protocols (PRISMA-P) 2015 guidelines. Discussion This review will help ascertain the impact of national iodization programmes on the iodine nutrition status in pregnancy in Africa and advise policy on the necessity for monitoring and mitigating iodine deficiency in pregnancy in Africa. This review is part of a thesis that will be submitted to the Faculty of Health Sciences, University of Cape Town, for the award of a PhD in Medicine whose protocol has been granted ethics approval (UCT HREC 135/2018). In addition, the results will be published in a peer-reviewed journal.
- Full Text:
- Date Issued: 22-8-2019
Beyond prose: Review of 'Poetic Inquiry for the Humanities and Social Sciences: Voices from the South and the North'
- Authors: McKenna, Sioux
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480817 , vital:78479 , https://hdl.handle.net/10520/ejc-sajsci-v121-n3-a11
- Description: The 54 authors of this book reflect on the use of poetic inquiry at a time when feminist, decolonial, and post-humanist researchers are raising concerns about the ways in which qualitative data collection and dissemination can silence some and reduce the experiences of others by adhering to the often-arbitrary restrictions of academic texts. Poetic inquiry, the authors of this book argue, should be welcoming, invite new perspectives, and make possible alternative interpretations of the social world. Sadly, as Pithouse-Morgan indicates, poetry is often associated with negative rather than positive educational experiences (p.201). For many of us, poetry is about mysterious meanings that our schoolteachers berated us for being too dense to access. While my own interest in poetic inquiry is in how we can use it to create and disseminate research, many authors in this book, such as Hough, Peté and Ndlovu, suggest that poetry can also be used “to teach complex topics from different points of view, make people more self-aware, encourage dialogue and empathy, grow social awareness, and raise ethical questions” (p.169). Badenhorst and McLeod point out that this can be challenging when working in neoliberal universities that turn us into human capital in service of competition and efficiency over social justice and equity. They suggest that poetry can help us to shift to a world “of senses and feeling [that] can provide a way to resist the tendrils of neoliberalism” (p.126).
- Full Text:
- Date Issued: 2025
- Authors: McKenna, Sioux
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480817 , vital:78479 , https://hdl.handle.net/10520/ejc-sajsci-v121-n3-a11
- Description: The 54 authors of this book reflect on the use of poetic inquiry at a time when feminist, decolonial, and post-humanist researchers are raising concerns about the ways in which qualitative data collection and dissemination can silence some and reduce the experiences of others by adhering to the often-arbitrary restrictions of academic texts. Poetic inquiry, the authors of this book argue, should be welcoming, invite new perspectives, and make possible alternative interpretations of the social world. Sadly, as Pithouse-Morgan indicates, poetry is often associated with negative rather than positive educational experiences (p.201). For many of us, poetry is about mysterious meanings that our schoolteachers berated us for being too dense to access. While my own interest in poetic inquiry is in how we can use it to create and disseminate research, many authors in this book, such as Hough, Peté and Ndlovu, suggest that poetry can also be used “to teach complex topics from different points of view, make people more self-aware, encourage dialogue and empathy, grow social awareness, and raise ethical questions” (p.169). Badenhorst and McLeod point out that this can be challenging when working in neoliberal universities that turn us into human capital in service of competition and efficiency over social justice and equity. They suggest that poetry can help us to shift to a world “of senses and feeling [that] can provide a way to resist the tendrils of neoliberalism” (p.126).
- Full Text:
- Date Issued: 2025
Investigating the Transparency of Language for Place Value Understanding Comparing Indigenous Southern African Languages and European-based Languages
- Larkin, Kevin, Vale, Pamela, Ladel, Silke, Westaway, Lise, Graven, Mellony, Kortenkamp, Ulrich
- Authors: Larkin, Kevin , Vale, Pamela , Ladel, Silke , Westaway, Lise , Graven, Mellony , Kortenkamp, Ulrich
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482410 , vital:78648 , https://doi.org/10.1080/18117295.2024.2438452
- Description: In this article we investigate the transparency of language in learning place value in either a Southern African indigenous language (isiXhosa, Setswana, Oshiwambo or Emakhuwa) or a European-based language (Afrikaans, English, German or Portuguese). Since language is a key mediator in developing place value understanding, it is important to investigate the ways in which the transparency of various languages may impact place value learning. A review of pertinent literature and an analysis of literal translations of number words (to thousands) of our eight languages lead us to the conclusion that Southern African indigenous languages are more accessible in their meaning, in relation to place value, than the four European-based languages spoken in Southern Africa, which we analysed. We identified two key advantages in the indigenous languages: (i) there was transparency of the ‘places’ in how numbers are named; and (ii) there was logical alignment between the spoken and symbolic representation of numbers. Despite this, many Southern African learners learn mathematics in English, Afrikaans or Portuguese even though this is not their home language (L1). This means that many learners are denied access to the transparency of the place value concepts that exist in their L1 and must manage learning place value, not only in a yet to be learned ‘foreign’ language, but also in one where they must learn to decode the idiosyncratic ‘irregularities’ of the way those languages name numbers. We conclude this article by discussing the implications of these findings for the teaching of place value in Southern African classrooms, in which indigenous learners are often learning in a European-based language that is not their L1.
- Full Text:
- Date Issued: 2025
- Authors: Larkin, Kevin , Vale, Pamela , Ladel, Silke , Westaway, Lise , Graven, Mellony , Kortenkamp, Ulrich
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482410 , vital:78648 , https://doi.org/10.1080/18117295.2024.2438452
- Description: In this article we investigate the transparency of language in learning place value in either a Southern African indigenous language (isiXhosa, Setswana, Oshiwambo or Emakhuwa) or a European-based language (Afrikaans, English, German or Portuguese). Since language is a key mediator in developing place value understanding, it is important to investigate the ways in which the transparency of various languages may impact place value learning. A review of pertinent literature and an analysis of literal translations of number words (to thousands) of our eight languages lead us to the conclusion that Southern African indigenous languages are more accessible in their meaning, in relation to place value, than the four European-based languages spoken in Southern Africa, which we analysed. We identified two key advantages in the indigenous languages: (i) there was transparency of the ‘places’ in how numbers are named; and (ii) there was logical alignment between the spoken and symbolic representation of numbers. Despite this, many Southern African learners learn mathematics in English, Afrikaans or Portuguese even though this is not their home language (L1). This means that many learners are denied access to the transparency of the place value concepts that exist in their L1 and must manage learning place value, not only in a yet to be learned ‘foreign’ language, but also in one where they must learn to decode the idiosyncratic ‘irregularities’ of the way those languages name numbers. We conclude this article by discussing the implications of these findings for the teaching of place value in Southern African classrooms, in which indigenous learners are often learning in a European-based language that is not their L1.
- Full Text:
- Date Issued: 2025
Neoliberalism constrains academic freedom
- Authors: McKenna, Sioux
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480540 , vital:78453 , https://hdl.handle.net/10520/ejc-sajsci-v121-n3-a18
- Description: Positioning the university as a public good that serves people and the planet was a central concern for those responsible for shaping post-apartheid education. Unfortunately, the current neoliberal environment has led to institutional risk aversion. This means that universities are loathe to speak out on issues of social injustice and environmental degradation. And academics often forfeit their freedoms by assuming that top management can speak on behalf of the university. In the Commentary 'Should our universities respond to geopolitical conflicts around the world?'1, Chetty questions when and why a university should speak out on global issues. In particular, Chetty refers to the Israeli-Palestinian war. I leave it to other respondents to tackle the substantive issue of South African higher education's silence on this issue. Instead, I home in on what I see as a common problem in the post-apartheid university. Chetty explains that: He thus understands the university as a complex organisation, as indeed it is. But he repeatedly reveals an understanding of the university as one which is controlled by management. For me, one of the most troubling sentences in the article is this: Universities thrive on a diversity of viewpoints, and so imposing a hegemonic view from the top management often leads to problems in a university setting.
- Full Text:
- Date Issued: 2025
- Authors: McKenna, Sioux
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480540 , vital:78453 , https://hdl.handle.net/10520/ejc-sajsci-v121-n3-a18
- Description: Positioning the university as a public good that serves people and the planet was a central concern for those responsible for shaping post-apartheid education. Unfortunately, the current neoliberal environment has led to institutional risk aversion. This means that universities are loathe to speak out on issues of social injustice and environmental degradation. And academics often forfeit their freedoms by assuming that top management can speak on behalf of the university. In the Commentary 'Should our universities respond to geopolitical conflicts around the world?'1, Chetty questions when and why a university should speak out on global issues. In particular, Chetty refers to the Israeli-Palestinian war. I leave it to other respondents to tackle the substantive issue of South African higher education's silence on this issue. Instead, I home in on what I see as a common problem in the post-apartheid university. Chetty explains that: He thus understands the university as a complex organisation, as indeed it is. But he repeatedly reveals an understanding of the university as one which is controlled by management. For me, one of the most troubling sentences in the article is this: Universities thrive on a diversity of viewpoints, and so imposing a hegemonic view from the top management often leads to problems in a university setting.
- Full Text:
- Date Issued: 2025
Reimagining library services: Transforming libraries into dynamic learning spaces in South African universities
- Authors: Nongalo, Noloyiso
- Date: 2025
- Subjects: Dynamic learning spaces , Collaborative enviroments , Inclusive education , Digital Literacy , Lifelong learning
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/11260/13140 , vital:77950 , DOI: https://doi.org/10.38159/ehass.2025641
- Description: This conceptual paper aimed to explore the transformation of university libraries in South Africa into dynamic learning spaces that cater to evolving academic and social needs of students. In the context of South Africa's rapidly changing higher education landscape, where inclusivity and technological advancements are paramount, the role of university libraries is shifting from traditional information repositories to hubs of collaborative learning and student engagement. The paper employed a qualitative review of literature and an analysis of the existing infrastructures in libraries of Historically Disadvantaged Institutions (HDIs) to identify strategies for this transformation. The findings highlighted the pivotal role libraries play in promoting lifelong learning, enhancing digital literacy, and supporting academic success. Key recommendations include the integration of advanced technology, the creation of flexible, student-centred spaces, and the incorporation of inclusive practices to accommodate diverse student populations. This paper contributes to ongoing research by offering a model for reimagining library spaces in line with global trends, providing insights for other educational institutions seeking to foster dynamic, student-focused learning environments.
- Full Text:
- Date Issued: 2025
- Authors: Nongalo, Noloyiso
- Date: 2025
- Subjects: Dynamic learning spaces , Collaborative enviroments , Inclusive education , Digital Literacy , Lifelong learning
- Language: English
- Type: article
- Identifier: http://hdl.handle.net/11260/13140 , vital:77950 , DOI: https://doi.org/10.38159/ehass.2025641
- Description: This conceptual paper aimed to explore the transformation of university libraries in South Africa into dynamic learning spaces that cater to evolving academic and social needs of students. In the context of South Africa's rapidly changing higher education landscape, where inclusivity and technological advancements are paramount, the role of university libraries is shifting from traditional information repositories to hubs of collaborative learning and student engagement. The paper employed a qualitative review of literature and an analysis of the existing infrastructures in libraries of Historically Disadvantaged Institutions (HDIs) to identify strategies for this transformation. The findings highlighted the pivotal role libraries play in promoting lifelong learning, enhancing digital literacy, and supporting academic success. Key recommendations include the integration of advanced technology, the creation of flexible, student-centred spaces, and the incorporation of inclusive practices to accommodate diverse student populations. This paper contributes to ongoing research by offering a model for reimagining library spaces in line with global trends, providing insights for other educational institutions seeking to foster dynamic, student-focused learning environments.
- Full Text:
- Date Issued: 2025
Simplified Taxation in Africa: What We Know – and Need to Know
- Gallien, Max, Hoy, Christopher, Komatsu, Hitomi, Ozer, Ceren, Rogan, Michael, Van den Boogaard, Vanessa
- Authors: Gallien, Max , Hoy, Christopher , Komatsu, Hitomi , Ozer, Ceren , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478250 , vital:78168 , DOI: 10.19088/ICTD.2025.012
- Description: Most economic operators in Africa are small and informal firms that fall under the purview of presumptive or simplified tax regimes (STRs). These taxes are expected to fulfil a range of functions, from raising revenue to facilitating formalisation and improving revenue authorities' data, and yet their effectiveness and impact are surprisingly under-researched. Meanwhile, emerging evidence suggests that STRs often raise little revenue, disproportionately impact low-income earners, and are inconsistently applied. This policy brief summarises what we know about simplified taxes in Africa, who pays them, and why they matter, while highlighting gaps in existing knowledge. It makes the argument that there is a need for a new policy conversation on simplified taxation, and one that is data-driven and evidence-based.
- Full Text:
- Date Issued: 2025
- Authors: Gallien, Max , Hoy, Christopher , Komatsu, Hitomi , Ozer, Ceren , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478250 , vital:78168 , DOI: 10.19088/ICTD.2025.012
- Description: Most economic operators in Africa are small and informal firms that fall under the purview of presumptive or simplified tax regimes (STRs). These taxes are expected to fulfil a range of functions, from raising revenue to facilitating formalisation and improving revenue authorities' data, and yet their effectiveness and impact are surprisingly under-researched. Meanwhile, emerging evidence suggests that STRs often raise little revenue, disproportionately impact low-income earners, and are inconsistently applied. This policy brief summarises what we know about simplified taxes in Africa, who pays them, and why they matter, while highlighting gaps in existing knowledge. It makes the argument that there is a need for a new policy conversation on simplified taxation, and one that is data-driven and evidence-based.
- Full Text:
- Date Issued: 2025
The heterogeneous effects of macroeconomic and financial factors on financial deepening in Africa: evidence from a method of moments quantile regression analysis
- Sanga, Bahati, Aziakpono, Meshach J
- Authors: Sanga, Bahati , Aziakpono, Meshach J
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469930 , vital:77308 , https://www.emerald.com/insight/content/doi/10.1108/jfep-07-2023-0199/full/html
- Description: This paper aims to investigate the heterogeneous effects of macroeconomic and financial factors across various distributions of financial deepening in 22 African countries over the past two decades (2000–2019). The paper uses a recent method of moments quantile regression, which accounts for the often overlooked heterogeneity effects. The analysis focuses on the banking sector, which is predominant in Africa, using a broad range of macroeconomic and financial indicators.
- Full Text:
- Date Issued: 2025
- Authors: Sanga, Bahati , Aziakpono, Meshach J
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469930 , vital:77308 , https://www.emerald.com/insight/content/doi/10.1108/jfep-07-2023-0199/full/html
- Description: This paper aims to investigate the heterogeneous effects of macroeconomic and financial factors across various distributions of financial deepening in 22 African countries over the past two decades (2000–2019). The paper uses a recent method of moments quantile regression, which accounts for the often overlooked heterogeneity effects. The analysis focuses on the banking sector, which is predominant in Africa, using a broad range of macroeconomic and financial indicators.
- Full Text:
- Date Issued: 2025
The taxed informal economy: Fiscal burdens and inequality in Accras
- Anyidoho, Nana A, Gallien, Max, Rogan, Michael, Van den Boogaard, Vanessa
- Authors: Anyidoho, Nana A , Gallien, Max , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478095 , vital:78154 , https://doi.org/10.1016/j.worlddev.2024.106879
- Description: The common assumption that informal economies are untaxed has underpinned arguments that they represent an ‘untapped goldmine’ for government coffers. However, there has been limited empirical engagement with this assumption. While some studies have highlighted that many informal businesses pay both formal and informal taxes, there has been little systematic accounting of these payments. Using a novel dataset of 2,700 informal enterprises in the Accra metropolitan area in Ghana, this article presents the first geographically representative account of the nature, distribution and impact of taxation in an urban informal sector. We find that the majority of informal sector operators in this context pay a range of taxes and fees, which together amount to a significant burden, especially for low earners. Two key findings emerge in relation to the structure of these taxes. First, the incidence and burden of tax payments is highly uneven and strongly correlated with visibility to the state, suggesting that taxation is driven more by patterns of state enforcement than the choices of informal operators. Second, taxes and fees are highly regressive, with lower-earning operators paying significantly more in relation to their earnings. These findings have important implications for both our conception of informal businesses and efforts to tax informal businesses in low- and middle-income countries.
- Full Text:
- Date Issued: 2025
- Authors: Anyidoho, Nana A , Gallien, Max , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478095 , vital:78154 , https://doi.org/10.1016/j.worlddev.2024.106879
- Description: The common assumption that informal economies are untaxed has underpinned arguments that they represent an ‘untapped goldmine’ for government coffers. However, there has been limited empirical engagement with this assumption. While some studies have highlighted that many informal businesses pay both formal and informal taxes, there has been little systematic accounting of these payments. Using a novel dataset of 2,700 informal enterprises in the Accra metropolitan area in Ghana, this article presents the first geographically representative account of the nature, distribution and impact of taxation in an urban informal sector. We find that the majority of informal sector operators in this context pay a range of taxes and fees, which together amount to a significant burden, especially for low earners. Two key findings emerge in relation to the structure of these taxes. First, the incidence and burden of tax payments is highly uneven and strongly correlated with visibility to the state, suggesting that taxation is driven more by patterns of state enforcement than the choices of informal operators. Second, taxes and fees are highly regressive, with lower-earning operators paying significantly more in relation to their earnings. These findings have important implications for both our conception of informal businesses and efforts to tax informal businesses in low- and middle-income countries.
- Full Text:
- Date Issued: 2025
The taxed informal economy: Fiscal burdens and inequality in Accras
- Anyidoho, Nana A, Gallien, Max, Rogan, Michael, Van den Boogaard, Vanessa
- Authors: Anyidoho, Nana A , Gallien, Max , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478084 , vital:78153 , https://doi.org/10.1016/j.worlddev.2024.106879
- Description: The common assumption that informal economies are untaxed has underpinned arguments that they represent an ‘untapped goldmine’ for government coffers. However, there has been limited empirical engagement with this assumption. While some studies have highlighted that many informal businesses pay both formal and informal taxes, there has been little systematic accounting of these payments. Using a novel dataset of 2,700 informal enterprises in the Accra metropolitan area in Ghana, this article presents the first geographically representative account of the nature, distribution and impact of taxation in an urban informal sector. We find that the majority of informal sector operators in this context pay a range of taxes and fees, which together amount to a significant burden, especially for low earners. Two key findings emerge in relation to the structure of these taxes. First, the incidence and burden of tax payments is highly uneven and strongly correlated with visibility to the state, suggesting that taxation is driven more by patterns of state enforcement than the choices of informal operators. Second, taxes and fees are highly regressive, with lower-earning operators paying significantly more in relation to their earnings. These findings have important implications for both our conception of informal businesses and efforts to tax informal businesses in low- and middle-income countries.
- Full Text:
- Date Issued: 2025
- Authors: Anyidoho, Nana A , Gallien, Max , Rogan, Michael , Van den Boogaard, Vanessa
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478084 , vital:78153 , https://doi.org/10.1016/j.worlddev.2024.106879
- Description: The common assumption that informal economies are untaxed has underpinned arguments that they represent an ‘untapped goldmine’ for government coffers. However, there has been limited empirical engagement with this assumption. While some studies have highlighted that many informal businesses pay both formal and informal taxes, there has been little systematic accounting of these payments. Using a novel dataset of 2,700 informal enterprises in the Accra metropolitan area in Ghana, this article presents the first geographically representative account of the nature, distribution and impact of taxation in an urban informal sector. We find that the majority of informal sector operators in this context pay a range of taxes and fees, which together amount to a significant burden, especially for low earners. Two key findings emerge in relation to the structure of these taxes. First, the incidence and burden of tax payments is highly uneven and strongly correlated with visibility to the state, suggesting that taxation is driven more by patterns of state enforcement than the choices of informal operators. Second, taxes and fees are highly regressive, with lower-earning operators paying significantly more in relation to their earnings. These findings have important implications for both our conception of informal businesses and efforts to tax informal businesses in low- and middle-income countries.
- Full Text:
- Date Issued: 2025
The use of gabions as an eco-engineering approach to enhance estuarine fish habitats in urbanised waterways
- Seath, Jessica L, Firth, L B, Froneman, P William, Claassens, Louw
- Authors: Seath, Jessica L , Firth, L B , Froneman, P William , Claassens, Louw
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/479396 , vital:78297 , https://doi.org/10.1016/j.ecoleng.2024.10743
- Description: Anthropogenic activities are often concentrated around coastal ecosystems. Harbours and marinas comprising artificial structures with steeper orientations and reduced topographic complexities than natural ecosystems contribute to habitat alteration and biodiversity loss. Ecological engineering aims to mitigate these impacts by integrating ecological principles into coastal development to enhance habitat potential and improve biodiversity. This study investigated the potential of gabions (rock-filled wire mesh baskets) to enhance fish abundance and biodiversity by comparing these structures to conventional seawalls in an urbanised marina in Knysna, South Africa. Remote underwater video systems were used to determine fish diversity, abundance and composition over a 12-month period from August 2020 to August 2021. Overall, a significantly greater abundance and diversity of fish were associated with gabions compared to seawalls. Importantly, the gabions supported an endangered species, the Knysna seahorse (Hippocampus capensis), and two near threatened species recorded only on the gabions. This study highlights the efficacy of using structurally complex gabions as a viable ecoengineering alternative to less complex seawalls to enhance fish habitat.
- Full Text:
- Date Issued: 2025
- Authors: Seath, Jessica L , Firth, L B , Froneman, P William , Claassens, Louw
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/479396 , vital:78297 , https://doi.org/10.1016/j.ecoleng.2024.10743
- Description: Anthropogenic activities are often concentrated around coastal ecosystems. Harbours and marinas comprising artificial structures with steeper orientations and reduced topographic complexities than natural ecosystems contribute to habitat alteration and biodiversity loss. Ecological engineering aims to mitigate these impacts by integrating ecological principles into coastal development to enhance habitat potential and improve biodiversity. This study investigated the potential of gabions (rock-filled wire mesh baskets) to enhance fish abundance and biodiversity by comparing these structures to conventional seawalls in an urbanised marina in Knysna, South Africa. Remote underwater video systems were used to determine fish diversity, abundance and composition over a 12-month period from August 2020 to August 2021. Overall, a significantly greater abundance and diversity of fish were associated with gabions compared to seawalls. Importantly, the gabions supported an endangered species, the Knysna seahorse (Hippocampus capensis), and two near threatened species recorded only on the gabions. This study highlights the efficacy of using structurally complex gabions as a viable ecoengineering alternative to less complex seawalls to enhance fish habitat.
- Full Text:
- Date Issued: 2025
Towards a relational understanding of youth lifestyles and wellbeing in climate resilient urban development insights from a seven-city study of young people
- Prendergast, Kate, Hayward, Bronwyn, Aoyagi, Midori, Burningham, Kate, Hasan, M Mehedi, Jackson, Tim, Jha, Vimlendu, Loukianov, Anastasia, Mattar, Helio, Schudel, Ingrid J, Yoshida, Aya
- Authors: Prendergast, Kate , Hayward, Bronwyn , Aoyagi, Midori , Burningham, Kate , Hasan, M Mehedi , Jackson, Tim , Jha, Vimlendu , Loukianov, Anastasia , Mattar, Helio , Schudel, Ingrid J , Yoshida, Aya
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482593 , vital:78669 , https://doi.org/10.1080/13549839.2025.2454985
- Description: Supporting youth wellbeing in low carbon ways is a crucial challenge in cities. Seventy percent of youth will live in urban areas by 2050 and urban sites account for 67–72% of the global share of carbon emissions. Young people’s consumption behaviour including energy use is increasingly identified as a key driver of urban emissions. This paper expands beyond dominant individualised approaches to examining urban youth wellbeing and consumption to interrogate the relational contexts in which young people live, their wellbeing aspirations, and the conditions that enable or lock-in lifestyle emissions. Applying a relational lens and thematic analysis to focus group data collected from 332 youth aged 12–24 years in seven cities of the global South and North, the paper examines experiences shaping youth wellbeing in the context of urban consumption activities. Findings emphasised the complexities of “linked lives”, foregrounding family, peer and community relationships as critical in shaping youth wellbeing and consumption.
- Full Text:
- Date Issued: 2025
- Authors: Prendergast, Kate , Hayward, Bronwyn , Aoyagi, Midori , Burningham, Kate , Hasan, M Mehedi , Jackson, Tim , Jha, Vimlendu , Loukianov, Anastasia , Mattar, Helio , Schudel, Ingrid J , Yoshida, Aya
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482593 , vital:78669 , https://doi.org/10.1080/13549839.2025.2454985
- Description: Supporting youth wellbeing in low carbon ways is a crucial challenge in cities. Seventy percent of youth will live in urban areas by 2050 and urban sites account for 67–72% of the global share of carbon emissions. Young people’s consumption behaviour including energy use is increasingly identified as a key driver of urban emissions. This paper expands beyond dominant individualised approaches to examining urban youth wellbeing and consumption to interrogate the relational contexts in which young people live, their wellbeing aspirations, and the conditions that enable or lock-in lifestyle emissions. Applying a relational lens and thematic analysis to focus group data collected from 332 youth aged 12–24 years in seven cities of the global South and North, the paper examines experiences shaping youth wellbeing in the context of urban consumption activities. Findings emphasised the complexities of “linked lives”, foregrounding family, peer and community relationships as critical in shaping youth wellbeing and consumption.
- Full Text:
- Date Issued: 2025
Transformative learning in geography education: international perspectives and practices
- Wilmot, P Dianne, Bednarz, Sarah H, Fatima, Munazza, De la Vega, Alfonso G, Grob, Regula, Mäsgen, Johanna, Wilson, Sophie
- Authors: Wilmot, P Dianne , Bednarz, Sarah H , Fatima, Munazza , De la Vega, Alfonso G , Grob, Regula , Mäsgen, Johanna , Wilson, Sophie
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/483010 , vital:78711 , https://doi.org/10.1080/10382046.2025.2473104
- Description: This paper critically reflects on how transformative learning (TL) is described both conceptually and as a process in the literature in different fields and national contexts. We articulate a definition of TL and justify why geography education is an ideal vehicle for enabling it. This is followed by a series of case studies explaining how TL can be and is being implemented in the curriculum topic of climate change in different countries. The findings of the analysis of the case studies are used to make propositions for further development and enactment of TL in geography education. The insights provided by this paper may help to move the field forward by opening new avenues of research and providing opportunities for cultivating a stronger geography education voice in global discourses about the types of learning required in a time of socio-ecological crisis and rapid societal change. Furthermore, it may provide practical ideas for improving learning and enhancing teaching practices which curriculum developers, learning resource producers, and practitioners may find useful.
- Full Text:
- Date Issued: 2025
- Authors: Wilmot, P Dianne , Bednarz, Sarah H , Fatima, Munazza , De la Vega, Alfonso G , Grob, Regula , Mäsgen, Johanna , Wilson, Sophie
- Date: 2025
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/483010 , vital:78711 , https://doi.org/10.1080/10382046.2025.2473104
- Description: This paper critically reflects on how transformative learning (TL) is described both conceptually and as a process in the literature in different fields and national contexts. We articulate a definition of TL and justify why geography education is an ideal vehicle for enabling it. This is followed by a series of case studies explaining how TL can be and is being implemented in the curriculum topic of climate change in different countries. The findings of the analysis of the case studies are used to make propositions for further development and enactment of TL in geography education. The insights provided by this paper may help to move the field forward by opening new avenues of research and providing opportunities for cultivating a stronger geography education voice in global discourses about the types of learning required in a time of socio-ecological crisis and rapid societal change. Furthermore, it may provide practical ideas for improving learning and enhancing teaching practices which curriculum developers, learning resource producers, and practitioners may find useful.
- Full Text:
- Date Issued: 2025
A Feasibility Study on the Efficacy of Functional Near-Infrared Spectrometry (fNIRS) to Measure Prefrontal Activation in Paediatric HIV
- Zondo, Sizwe, Ferreira-Correia, Aline, Cockcroft, Kate
- Authors: Zondo, Sizwe , Ferreira-Correia, Aline , Cockcroft, Kate
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/450556 , vital:74960 , xlink:href="https://www.hindawi.com/journals/js/2024/4970794/"
- Description: Human immunodeficiency virus (HIV) infection is associated with disturbed neurotransmission and aberrant cortical networks. Although advances in the imaging of brain microarchitecture following neuroHIV has added to our knowledge of structural and functional changes associated with HIV, no data exists on paediatric HIV using optical neuroimaging techniques. This study investigated the feasibility of optical neuroimaging in paediatric HIV using functional near-infrared spectrometry (fNIRS). We measured prefrontal brain activation while participants executed a sustained attention task. We specifically tested whether patients living with HIV and study controls could perform the study protocol and whether we could measure the typical fNIRS haemodynamic response associated with neuronal activity. Eighteen participants (10 HIV participants, mean age: 13.9, SD = 1.66 years; 8 controls, mean age: 14.8, SD = 1.28 years), matched for sex, grade, and socio-economic status, were included in the study. All participants completed the Stroop colour word test (SCWT). Oxygenated haemoglobin concentration and the deoxygenated haemoglobin signal were recorded from the dorsolateral prefrontal cortex and the frontopolar area (FA) using fNIRS. The control group performed significantly better in terms of reaction time on the congruent and incongruent condition (congruent: t (16) = −3.36, : incongruent: ). A pooled group analysis of the sample indicated significant activation in the DLPF and FA to the congruent condition of the SCWT (). Although cortical activation was noted in the DLPF and the FA in each of the groups when analysed independently, this neural activation did not reach statistical significance. The results show promise that fNIRS techniques are feasible for assessing prefrontal cortical activity in paediatric HIV. Future studies should seek to reduce the signal-to-noise ratio and consider inter-individual variability when measuring prefrontal activation in paediatric samples.
- Full Text:
- Date Issued: 2024
- Authors: Zondo, Sizwe , Ferreira-Correia, Aline , Cockcroft, Kate
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/450556 , vital:74960 , xlink:href="https://www.hindawi.com/journals/js/2024/4970794/"
- Description: Human immunodeficiency virus (HIV) infection is associated with disturbed neurotransmission and aberrant cortical networks. Although advances in the imaging of brain microarchitecture following neuroHIV has added to our knowledge of structural and functional changes associated with HIV, no data exists on paediatric HIV using optical neuroimaging techniques. This study investigated the feasibility of optical neuroimaging in paediatric HIV using functional near-infrared spectrometry (fNIRS). We measured prefrontal brain activation while participants executed a sustained attention task. We specifically tested whether patients living with HIV and study controls could perform the study protocol and whether we could measure the typical fNIRS haemodynamic response associated with neuronal activity. Eighteen participants (10 HIV participants, mean age: 13.9, SD = 1.66 years; 8 controls, mean age: 14.8, SD = 1.28 years), matched for sex, grade, and socio-economic status, were included in the study. All participants completed the Stroop colour word test (SCWT). Oxygenated haemoglobin concentration and the deoxygenated haemoglobin signal were recorded from the dorsolateral prefrontal cortex and the frontopolar area (FA) using fNIRS. The control group performed significantly better in terms of reaction time on the congruent and incongruent condition (congruent: t (16) = −3.36, : incongruent: ). A pooled group analysis of the sample indicated significant activation in the DLPF and FA to the congruent condition of the SCWT (). Although cortical activation was noted in the DLPF and the FA in each of the groups when analysed independently, this neural activation did not reach statistical significance. The results show promise that fNIRS techniques are feasible for assessing prefrontal cortical activity in paediatric HIV. Future studies should seek to reduce the signal-to-noise ratio and consider inter-individual variability when measuring prefrontal activation in paediatric samples.
- Full Text:
- Date Issued: 2024
A landscape view of emerging sustainability responses within VET
- Ramsarup, Presha, McGrath, Simon, Lotz-Sisitka, Heila
- Authors: Ramsarup, Presha , McGrath, Simon , Lotz-Sisitka, Heila
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482604 , vital:78670 , https://doi.org/10.1080/13636820.2024.2320911
- Description: With evidence of global climate change and ongoing ecological degradation, there is an urgent need to give more attention to sustainability within VET to ensure that VET does not remain complicit in reproducing the unjust and unsustainable trajectories of current economic and development pathways. At present, the VET literature does not adequately address these issues, hence the need for this special issue. In response, this paper offers a meta-reflective ‘landscape view’ of the sustainability within the VET ‘field of knowledge’ as it is emerging. Here, we use landscape review as a multi-dimensional, ‘outside-in’ view that provides a basis for understanding the broad context and helps to inform actionable next steps. This analysis we believe helps to highlight the key emerging priorities as well as what paths VET is taking on the journey to sustainability. The analysis shows that while some progress has been made in policy and practice related to the ‘greening’ of VET, much of the current response within VET to the environmental challenge reflects a minimalist reformist approach, characterised by ‘bolt-ons’ to existing institutional structures and curricula whilst leaving the fundamental beliefs in productivism, industrialisation and growth in place. Yet, as argued by researchers working on green economy, these beliefs are often complicit in co-creation of the environmental crisis.
- Full Text:
- Date Issued: 2024
- Authors: Ramsarup, Presha , McGrath, Simon , Lotz-Sisitka, Heila
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482604 , vital:78670 , https://doi.org/10.1080/13636820.2024.2320911
- Description: With evidence of global climate change and ongoing ecological degradation, there is an urgent need to give more attention to sustainability within VET to ensure that VET does not remain complicit in reproducing the unjust and unsustainable trajectories of current economic and development pathways. At present, the VET literature does not adequately address these issues, hence the need for this special issue. In response, this paper offers a meta-reflective ‘landscape view’ of the sustainability within the VET ‘field of knowledge’ as it is emerging. Here, we use landscape review as a multi-dimensional, ‘outside-in’ view that provides a basis for understanding the broad context and helps to inform actionable next steps. This analysis we believe helps to highlight the key emerging priorities as well as what paths VET is taking on the journey to sustainability. The analysis shows that while some progress has been made in policy and practice related to the ‘greening’ of VET, much of the current response within VET to the environmental challenge reflects a minimalist reformist approach, characterised by ‘bolt-ons’ to existing institutional structures and curricula whilst leaving the fundamental beliefs in productivism, industrialisation and growth in place. Yet, as argued by researchers working on green economy, these beliefs are often complicit in co-creation of the environmental crisis.
- Full Text:
- Date Issued: 2024
A lateral line organ for Slow co-engaged science for hot messes
- McGarry, Dylan K, Bozalek, Vivienne, Martin, Aaniyah
- Authors: McGarry, Dylan K , Bozalek, Vivienne , Martin, Aaniyah
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480373 , vital:78436 , https://hdl.handle.net/10520/ejc-sajsci-v120-n9-a12
- Description: Surfacing the connections between science engagement, engaged science, and sustainability sciences, we urge a re-evaluation of sustainability science's beneficiaries and goals, by advocating a transdisciplinary approach to address sustainability challenges, based on a relational ontology. Thinking with posthumanist, feminist new materialist and Black feminist theories, we consider the importance of multispecies attention and empathy in scientific research. We propose a concept of evolving new perceptual organs in humans to enhance collective responsiveness, inspired by the lateral line organ in fish and their collaborative intelligence for navigating contemporary social and ecological crises and injustices in 'hot messes'.
- Full Text:
- Date Issued: 2024
- Authors: McGarry, Dylan K , Bozalek, Vivienne , Martin, Aaniyah
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/480373 , vital:78436 , https://hdl.handle.net/10520/ejc-sajsci-v120-n9-a12
- Description: Surfacing the connections between science engagement, engaged science, and sustainability sciences, we urge a re-evaluation of sustainability science's beneficiaries and goals, by advocating a transdisciplinary approach to address sustainability challenges, based on a relational ontology. Thinking with posthumanist, feminist new materialist and Black feminist theories, we consider the importance of multispecies attention and empathy in scientific research. We propose a concept of evolving new perceptual organs in humans to enhance collective responsiveness, inspired by the lateral line organ in fish and their collaborative intelligence for navigating contemporary social and ecological crises and injustices in 'hot messes'.
- Full Text:
- Date Issued: 2024
A Modern Guide to the Informal Economy, by Colin C. Williams
- Authors: Rogan, Michael
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/473700 , vital:77674 , https://ilr-rit.org/article/id/19385/
- Description: Colin C. Williams’ new book, A Modern Guide to the Informal Economy, offers a timely analysis of a segment of the global workforce that has received increasing atten tion in recent years. A range of different measures suggest that, globally, the vast majority (61 per cent) of all employment is informal.1 Once thought to be exclusive to labour markets in middle- and low-income countries, the rise of platform work and the gig economy in the economies of developed countries has spurred new inter est in the subject. Similarly, the uneven effects of the pandemic and its aftermath have drawn unprecedented attention to the resultant economic and social crisis, which has disproportionately affected workers in the informal economy.2 Using the most internationally comparable definition of the informal economy as comprising all workers without legal or social protection through their employment,3 the recent pandemic and continuing economic crisis has left the bulk of the global workforce without a safety net. Such a “moment” naturally raises questions about the structure of employment, the role and reach of social protection programmes and the policy options available in countries where informal employment is the norm.
- Full Text:
- Date Issued: 2024
- Authors: Rogan, Michael
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/473700 , vital:77674 , https://ilr-rit.org/article/id/19385/
- Description: Colin C. Williams’ new book, A Modern Guide to the Informal Economy, offers a timely analysis of a segment of the global workforce that has received increasing atten tion in recent years. A range of different measures suggest that, globally, the vast majority (61 per cent) of all employment is informal.1 Once thought to be exclusive to labour markets in middle- and low-income countries, the rise of platform work and the gig economy in the economies of developed countries has spurred new inter est in the subject. Similarly, the uneven effects of the pandemic and its aftermath have drawn unprecedented attention to the resultant economic and social crisis, which has disproportionately affected workers in the informal economy.2 Using the most internationally comparable definition of the informal economy as comprising all workers without legal or social protection through their employment,3 the recent pandemic and continuing economic crisis has left the bulk of the global workforce without a safety net. Such a “moment” naturally raises questions about the structure of employment, the role and reach of social protection programmes and the policy options available in countries where informal employment is the norm.
- Full Text:
- Date Issued: 2024
A Socio-Historical Approach to Regional Organizational Relations? NGOs in Gender Security in the SADC Region
- Authors: Nedziwe, Cecilia L
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445278 , vital:74370 , https://doi.org/10.22151/politikon.57.1
- Description: The extant academic literature in the field of regional International Relations has paid little attention to non-state actors’ organizational relations in building region-ness. Yet, the region offers sets of organizational relations outside, alongside, and as part of the formal regional state structures to do with gender, which offer insights into non-state regional relations and thus help to fill the lacunae in the field and facilitate understanding of the regional dynamic of international relations. This article examines how organizational relations of non-state actors in gender security play out in the Southern African Development Community (SADC) region. It highlights the shortcomings of the inter-governmental approach to international relations pursued by various scholars. Drawing on interviews with representatives of NGOs, governments, the SADC, and annual reports, as well as the academic literature, it argues for a socio-historical approach to understanding regional organization and transnationalism, which considers African agency in building region-ness.
- Full Text:
- Date Issued: 2024
- Authors: Nedziwe, Cecilia L
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445278 , vital:74370 , https://doi.org/10.22151/politikon.57.1
- Description: The extant academic literature in the field of regional International Relations has paid little attention to non-state actors’ organizational relations in building region-ness. Yet, the region offers sets of organizational relations outside, alongside, and as part of the formal regional state structures to do with gender, which offer insights into non-state regional relations and thus help to fill the lacunae in the field and facilitate understanding of the regional dynamic of international relations. This article examines how organizational relations of non-state actors in gender security play out in the Southern African Development Community (SADC) region. It highlights the shortcomings of the inter-governmental approach to international relations pursued by various scholars. Drawing on interviews with representatives of NGOs, governments, the SADC, and annual reports, as well as the academic literature, it argues for a socio-historical approach to understanding regional organization and transnationalism, which considers African agency in building region-ness.
- Full Text:
- Date Issued: 2024
Anton Reichenow and the birds of Africa
- Authors: Craig, Adrian J F K
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465289 , vital:76590 , https://doi.org/10.2989/00306525.2023.2263165
- Description: The first handbook of the birds of Africa was completed in 1905 by Anton Reichenow (1847–1941). Based in the Berlin museum for almost 50 years, he described 152 African taxa that are still recognised as valid species today, and was considered by his contemporaries as a key figure in the development of African ornithology.
- Full Text:
- Date Issued: 2024
- Authors: Craig, Adrian J F K
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/465289 , vital:76590 , https://doi.org/10.2989/00306525.2023.2263165
- Description: The first handbook of the birds of Africa was completed in 1905 by Anton Reichenow (1847–1941). Based in the Berlin museum for almost 50 years, he described 152 African taxa that are still recognised as valid species today, and was considered by his contemporaries as a key figure in the development of African ornithology.
- Full Text:
- Date Issued: 2024
Biotic resistance towards Hydrellia egeriae, a biological control agent for the aquatic weed Egeria densa, in South Africa
- Moffat, Rosali, Van Noort, Simon, Coetzee, Julie A, Hill, Martin P
- Authors: Moffat, Rosali , Van Noort, Simon , Coetzee, Julie A , Hill, Martin P
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/451299 , vital:75038 , http://dx.doi.org/10.17159/2254-8854/2024/a15718
- Description: Egeria densa is a submerged aquatic weed that can grow into dense monocultures in rivers and dams in South Africa, which negatively affects ecosystem functioning and services. The biological control agent Hydrellia egeriae Rodrigues-Júnior (Diptera: Ephydridae) was first released against Egeria densa Planchon (Hydrocharitaceae) in South Africa in 2018. Biotic resistance in an introduced range can have negative impacts on the ability of a biological control agent to establish and exert top-down pressure. Dipteran and lepidopteran species that are used as biological control agents are often susceptible to higher levels of parasitism in their introduced range than biological control agents from other insect orders. In addition, ecological analogues that are present in South Africa, make H. egeriae particularly vulnerable to biotic resistance. Considering this, post-release surveys were conducted to investigate if native parasitoids will extend their host range to include H. egeriae. Chaenusa seminervata van Achterberg, C. anervata van Achterberg (Braconidae: Alysiinae: Dacnusini) and Ademon lagarosiphonae van Achterberg (Braconidae: Opiinae) were reared from field-collected H. egeriae pupae, within a year of its release. These braconid parasitoids were previously recorded from a native herbivore, Hydrellia lagarosiphon Deeming (Diptera: Ephydridae).
- Full Text:
- Date Issued: 2024
- Authors: Moffat, Rosali , Van Noort, Simon , Coetzee, Julie A , Hill, Martin P
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/451299 , vital:75038 , http://dx.doi.org/10.17159/2254-8854/2024/a15718
- Description: Egeria densa is a submerged aquatic weed that can grow into dense monocultures in rivers and dams in South Africa, which negatively affects ecosystem functioning and services. The biological control agent Hydrellia egeriae Rodrigues-Júnior (Diptera: Ephydridae) was first released against Egeria densa Planchon (Hydrocharitaceae) in South Africa in 2018. Biotic resistance in an introduced range can have negative impacts on the ability of a biological control agent to establish and exert top-down pressure. Dipteran and lepidopteran species that are used as biological control agents are often susceptible to higher levels of parasitism in their introduced range than biological control agents from other insect orders. In addition, ecological analogues that are present in South Africa, make H. egeriae particularly vulnerable to biotic resistance. Considering this, post-release surveys were conducted to investigate if native parasitoids will extend their host range to include H. egeriae. Chaenusa seminervata van Achterberg, C. anervata van Achterberg (Braconidae: Alysiinae: Dacnusini) and Ademon lagarosiphonae van Achterberg (Braconidae: Opiinae) were reared from field-collected H. egeriae pupae, within a year of its release. These braconid parasitoids were previously recorded from a native herbivore, Hydrellia lagarosiphon Deeming (Diptera: Ephydridae).
- Full Text:
- Date Issued: 2024
Black Twitter and Digital Counterpublics in South Africa
- Authors: Aiseng, Kealeboga
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/455188 , vital:75411 , https://doi.org/10.11114/smc.v12i2.6540
- Description: The growth of technology has made the Internet an essential tool in so-ciety. Scholars have argued that the Internet supports a more delibera-tive democracy. However, scholars have also raised concerns about the role of the Internet in political matters. While scholars agree that the Internet has facilitated broader public discussion, in many regards, its ‘virtual public sphere’still mirrors existing social structures. Twitter has become a common social media platform for many South Africans. This has led to a virtual community of Twitter users engaged in real-time dis-courses primarily related to Black South Africans. Black Twitter in South Africa is used for social, political, and economic motivations. This study argues for the practice of Black Twitter as a digital counterpublic in South Africa. The aim is to spotlight how black people in South Africa have used Black Twitter as a digital counterpublic for the marginalized groups within South Africa. The research will investigate the potential challenges and opportunities associated with Black Twitter functioning as a digital counterpublic. Utilizing digital ethnography, the study gath-ered a dataset of tweets from Black Twitter in 2022, focusing on those addressing social, political, and economic issues. More than 700,000 tweets were identified under these specific thematic hashtags.
- Full Text:
- Date Issued: 2024
- Authors: Aiseng, Kealeboga
- Date: 2024
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/455188 , vital:75411 , https://doi.org/10.11114/smc.v12i2.6540
- Description: The growth of technology has made the Internet an essential tool in so-ciety. Scholars have argued that the Internet supports a more delibera-tive democracy. However, scholars have also raised concerns about the role of the Internet in political matters. While scholars agree that the Internet has facilitated broader public discussion, in many regards, its ‘virtual public sphere’still mirrors existing social structures. Twitter has become a common social media platform for many South Africans. This has led to a virtual community of Twitter users engaged in real-time dis-courses primarily related to Black South Africans. Black Twitter in South Africa is used for social, political, and economic motivations. This study argues for the practice of Black Twitter as a digital counterpublic in South Africa. The aim is to spotlight how black people in South Africa have used Black Twitter as a digital counterpublic for the marginalized groups within South Africa. The research will investigate the potential challenges and opportunities associated with Black Twitter functioning as a digital counterpublic. Utilizing digital ethnography, the study gath-ered a dataset of tweets from Black Twitter in 2022, focusing on those addressing social, political, and economic issues. More than 700,000 tweets were identified under these specific thematic hashtags.
- Full Text:
- Date Issued: 2024