Factors influencing survivorship of Portulacaria afra cuttings in restoration of degraded lands
- Authors: Sholto-Douglas, Craig
- Date: 2019
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/92230 , vital:30692
- Description: Heavy over-browsing, over-grazing, and over-trampling has caused the degradation of vast areas of subtropical thicket, including parts of the Greater Addo Elephant National Park (GAENP). Severe degradation has resulted in the loss of vegetation cover and the deterioration of soils and soil functioning. The South African Department of Environmental Affairs (DEA), and specifically the Natural Resource Management Programme (NRM), have invested in restoration initiatives such as the Subtropical Thicket Restoration Programme (STRP), which has aimed to demonstrate the logistical and practical feasibility of restoring these degraded thickets by planting en masse Portulacaria afra (spekboom) cuttings. However, the planted P. afra cuttings often succumb to various abiotic and biotic stresses. This project aimed to identify various factors which may influence the survival of P. afra cuttings, including i) soil properties, ii) water (rainfall, infiltration, run-off, etc.), iii) browsing by mega-herbivores, iv) topographical features such as slope and aspect, or v) plant species or communities. Biodiversity and carbon baselines were carried out at 50 plots within the Main Camp, Darlington and Kabouga sections of the GAENP, providing pre-planting vegetation and soil data. The en masse planting of P. afra occurred following the completion of the baselines. Following a minimum rest period of three months after planting, survivorship counts were carried out at all plots. Infiltration rate had a significant positive relationship with planted P. afra survivorship across all of the sites. Positive trends between increases in litter and root biomass and planted P. afra cuttings survivorship in Kabouga were also evident. Magnesium, water-holding capacity and increasing soil clay percentage were found to have a significant negative relationship with planted P. afra survivorship in Kabouga. Aluminium, magnesium, and boron all had significant positive relationships with planted P. afra cuttings survivorship in Addo Main Camp. No soil variables had any significant relationship with survivorship of planted P. afra cuttings at Darlington. The presence of elephants (Loxidonta africana) had a significant negative relationship with planted P. afra survivorship. Plant communities in more ‘moderately’ degraded states, characterized by the retention of canopy dominant species, woody vegetation cover, limited bareground and higher cover of litter had higher survivorship of planted P. afra cuttings than those in more severely degraded states. The grass Panicum maximum, and forb Atriplex semibaccata were associated with positive relationships with planted P. afra survivorship across all sites. Future research should aim to develop matrices which plot likely survivorship percentages with parameters of measurable variables, such as infiltration, severity of soil capping, browsing densities, chemical indicators, and degradation severity, to identify suitable biophysical planting conditions for P. afra cuttings. Further research should assess whether the presence of elephants, in high densities, can reduce the economic feasibility of the en masse plantings of P. afra cuttings in attempts to restore degraded landscapes.
- Full Text:
- Authors: Sholto-Douglas, Craig
- Date: 2019
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/92230 , vital:30692
- Description: Heavy over-browsing, over-grazing, and over-trampling has caused the degradation of vast areas of subtropical thicket, including parts of the Greater Addo Elephant National Park (GAENP). Severe degradation has resulted in the loss of vegetation cover and the deterioration of soils and soil functioning. The South African Department of Environmental Affairs (DEA), and specifically the Natural Resource Management Programme (NRM), have invested in restoration initiatives such as the Subtropical Thicket Restoration Programme (STRP), which has aimed to demonstrate the logistical and practical feasibility of restoring these degraded thickets by planting en masse Portulacaria afra (spekboom) cuttings. However, the planted P. afra cuttings often succumb to various abiotic and biotic stresses. This project aimed to identify various factors which may influence the survival of P. afra cuttings, including i) soil properties, ii) water (rainfall, infiltration, run-off, etc.), iii) browsing by mega-herbivores, iv) topographical features such as slope and aspect, or v) plant species or communities. Biodiversity and carbon baselines were carried out at 50 plots within the Main Camp, Darlington and Kabouga sections of the GAENP, providing pre-planting vegetation and soil data. The en masse planting of P. afra occurred following the completion of the baselines. Following a minimum rest period of three months after planting, survivorship counts were carried out at all plots. Infiltration rate had a significant positive relationship with planted P. afra survivorship across all of the sites. Positive trends between increases in litter and root biomass and planted P. afra cuttings survivorship in Kabouga were also evident. Magnesium, water-holding capacity and increasing soil clay percentage were found to have a significant negative relationship with planted P. afra survivorship in Kabouga. Aluminium, magnesium, and boron all had significant positive relationships with planted P. afra cuttings survivorship in Addo Main Camp. No soil variables had any significant relationship with survivorship of planted P. afra cuttings at Darlington. The presence of elephants (Loxidonta africana) had a significant negative relationship with planted P. afra survivorship. Plant communities in more ‘moderately’ degraded states, characterized by the retention of canopy dominant species, woody vegetation cover, limited bareground and higher cover of litter had higher survivorship of planted P. afra cuttings than those in more severely degraded states. The grass Panicum maximum, and forb Atriplex semibaccata were associated with positive relationships with planted P. afra survivorship across all sites. Future research should aim to develop matrices which plot likely survivorship percentages with parameters of measurable variables, such as infiltration, severity of soil capping, browsing densities, chemical indicators, and degradation severity, to identify suitable biophysical planting conditions for P. afra cuttings. Further research should assess whether the presence of elephants, in high densities, can reduce the economic feasibility of the en masse plantings of P. afra cuttings in attempts to restore degraded landscapes.
- Full Text:
Dangerous liaisons or critical alliances: student perceptions of community engagement at Rhodes University, South Africa
- Authors: Levy, Simone Arielle
- Date: 2018
- Subjects: Rhodes University -- Students -- Public services , Community and college -- South Africa -- Eastern Cape , Education, Higher -- Social aspects -- South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/57411 , vital:26907
- Description: Community Engagement (CE) in South Africa is an increasingly important feature of the relationship between the university and a broader community, and may aid in bridging the entrenched social divisions of this nation. This will only be possible if CE succeeds in uniting the knowledge production interests of the university and the broader community. Through CE, knowledge production and dissemination from within the university should be made more relevant and applicable because it is based on a relationship or engagement with a community. Based on the perceptions of student volunteers in a CE programme at a South African university, this thesis set out to ask whether or not students are transformed through university-community collaboration. This research examines the perceptions and motivations of student volunteers entering community partnership programmes. More importantly, it asks whether these engagements are merely a “weekend special” consisting of shallow engagements, which last only a few hours a week that provide institutional window dressing; or well-intended engagements through which students build meaningful relationships and experience learning opportunities that prepare them for real world civic participation. As this thesis focuses on the student perspective, it explores whether or not CE has an impact, both personally and educationally or academically, on the lives of individual student volunteers. The literature on CE argues that students’ participation in CE opportunities should enhance academic learning, personal growth and promote a sense of citizenship or civic responsibility. Based on the perceptions of a small group of student volunteers at one university, this thesis identifies possible successes and limitations of CE volunteering programmes in order to see if what is promoted in the literature or institutional policies is being experienced or achieved in practice at universities. I argue that students are indeed transformed through processes of CE, often in unexpected ways, and despite many difficulties. Therefore, if CE provides students with more holistic learning opportunities while attending universities for academic ends, it is important to look at in what ways this is achieved.
- Full Text:
- Authors: Levy, Simone Arielle
- Date: 2018
- Subjects: Rhodes University -- Students -- Public services , Community and college -- South Africa -- Eastern Cape , Education, Higher -- Social aspects -- South Africa
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/57411 , vital:26907
- Description: Community Engagement (CE) in South Africa is an increasingly important feature of the relationship between the university and a broader community, and may aid in bridging the entrenched social divisions of this nation. This will only be possible if CE succeeds in uniting the knowledge production interests of the university and the broader community. Through CE, knowledge production and dissemination from within the university should be made more relevant and applicable because it is based on a relationship or engagement with a community. Based on the perceptions of student volunteers in a CE programme at a South African university, this thesis set out to ask whether or not students are transformed through university-community collaboration. This research examines the perceptions and motivations of student volunteers entering community partnership programmes. More importantly, it asks whether these engagements are merely a “weekend special” consisting of shallow engagements, which last only a few hours a week that provide institutional window dressing; or well-intended engagements through which students build meaningful relationships and experience learning opportunities that prepare them for real world civic participation. As this thesis focuses on the student perspective, it explores whether or not CE has an impact, both personally and educationally or academically, on the lives of individual student volunteers. The literature on CE argues that students’ participation in CE opportunities should enhance academic learning, personal growth and promote a sense of citizenship or civic responsibility. Based on the perceptions of a small group of student volunteers at one university, this thesis identifies possible successes and limitations of CE volunteering programmes in order to see if what is promoted in the literature or institutional policies is being experienced or achieved in practice at universities. I argue that students are indeed transformed through processes of CE, often in unexpected ways, and despite many difficulties. Therefore, if CE provides students with more holistic learning opportunities while attending universities for academic ends, it is important to look at in what ways this is achieved.
- Full Text:
An investigation into the utility of the ImPACT neurocognitive screening tool with patients diagnosed with multiple sclerosis
- Authors: Wurz, Carl
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5366 , vital:20918
- Description: Objective: The objective of this study was to investigate the utility of the Immediate Post Concussion Assessment and Cognitive Testing (ImPACT) assessment tool in the neurocognitive screening of patients with Multiple Sclerosis (MS). Participants and Method: Patients diagnosed with Multiple Sclerosis (n = 29) were compared with a healthy control group (n = 20) of equivalent age, years of education, quality of education and estimated premorbid IQ. Measures included five ImPACT composite scores, the ImPACT Design Memory Delayed Recall subtest, the Symbol Digit Modalities Test (SDMT) that has shown prior sensitivity to cognitive dysfunction in MS groups, and the SDMT Delayed Recall test. T-test analyses compared test performances of the MS patient group with the control group; correlational analyses investigated the construct similarities between the ImPACT and SDMT tests. Results: There was a consistent trend for the MS patient group to perform worse than controls on all the neurocognitive tests. Significant differences accompanied by medium to high effect sizes were in evidence for ImPACT Reaction Time, ImPACT Cognitive Efficiency Index, ImPACT Design Memory Delayed Recall, SDMT, and SDMT Delayed Recall test. Correlational analyses revealed construct comparability between the ImPACT tests calling upon processing speed and the SDMT, as well as the IMPACT and SDMT delayed recall tasks. Conclusions: The results support the utility of the ImPACT test as a screening instrument for the detection of cognitive dysfunction in patients with MS. Tests tapping general cognitive efficiency, processing speed, reaction time, and delayed recall rather than immediate recall reveal particular utility as neurocognitive screening aids for patients with MS.
- Full Text:
- Authors: Wurz, Carl
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5366 , vital:20918
- Description: Objective: The objective of this study was to investigate the utility of the Immediate Post Concussion Assessment and Cognitive Testing (ImPACT) assessment tool in the neurocognitive screening of patients with Multiple Sclerosis (MS). Participants and Method: Patients diagnosed with Multiple Sclerosis (n = 29) were compared with a healthy control group (n = 20) of equivalent age, years of education, quality of education and estimated premorbid IQ. Measures included five ImPACT composite scores, the ImPACT Design Memory Delayed Recall subtest, the Symbol Digit Modalities Test (SDMT) that has shown prior sensitivity to cognitive dysfunction in MS groups, and the SDMT Delayed Recall test. T-test analyses compared test performances of the MS patient group with the control group; correlational analyses investigated the construct similarities between the ImPACT and SDMT tests. Results: There was a consistent trend for the MS patient group to perform worse than controls on all the neurocognitive tests. Significant differences accompanied by medium to high effect sizes were in evidence for ImPACT Reaction Time, ImPACT Cognitive Efficiency Index, ImPACT Design Memory Delayed Recall, SDMT, and SDMT Delayed Recall test. Correlational analyses revealed construct comparability between the ImPACT tests calling upon processing speed and the SDMT, as well as the IMPACT and SDMT delayed recall tasks. Conclusions: The results support the utility of the ImPACT test as a screening instrument for the detection of cognitive dysfunction in patients with MS. Tests tapping general cognitive efficiency, processing speed, reaction time, and delayed recall rather than immediate recall reveal particular utility as neurocognitive screening aids for patients with MS.
- Full Text:
Conversations, turn-taking, and dialogue: an analysis of the political deliberations of Zimbabwean citizens on the @263Chat Twitter handle
- Authors: Ncube, Meli Mthabisi
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4510 , vital:20684
- Description: The micro-blogging site Twitter, and the social networking site Facebook, are playing a key role in facilitating active political expression in the form of demonstrations against high rates of unemployment, poverty, rampant government repression and corruption. Twitter use in Zimbabwe is very vibrant and it even has its own name, ‘Zwitter.’ Zimbabwe has a closed legacy news media which are highly restricted, and most of the major news outlets are controlled by the state. Another limiting factor to any meaningful practice of deliberative democracy through the media and town hall debates is the intolerance of the ruling party ZANU-PF in dealing with dissenting voices. Thus in Zimbabwean politics, it can be argued that the internet has liberated political debates that have been suppressed and digital media is central to political and social deliberation. This study examines whether there are conversations, turn-taking, and dialogues-all features of deliberations- on the @263Chat Twitter platform which is used as a case study. Qualitative content analysis and interviewing were used to collect the data. The preliminary results of the research show that citizen-led engagements, which are facilitated by @263Chat, have brought to the fore the covert potential of social media platforms to drive political participation and deliberation.
- Full Text:
- Authors: Ncube, Meli Mthabisi
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4510 , vital:20684
- Description: The micro-blogging site Twitter, and the social networking site Facebook, are playing a key role in facilitating active political expression in the form of demonstrations against high rates of unemployment, poverty, rampant government repression and corruption. Twitter use in Zimbabwe is very vibrant and it even has its own name, ‘Zwitter.’ Zimbabwe has a closed legacy news media which are highly restricted, and most of the major news outlets are controlled by the state. Another limiting factor to any meaningful practice of deliberative democracy through the media and town hall debates is the intolerance of the ruling party ZANU-PF in dealing with dissenting voices. Thus in Zimbabwean politics, it can be argued that the internet has liberated political debates that have been suppressed and digital media is central to political and social deliberation. This study examines whether there are conversations, turn-taking, and dialogues-all features of deliberations- on the @263Chat Twitter platform which is used as a case study. Qualitative content analysis and interviewing were used to collect the data. The preliminary results of the research show that citizen-led engagements, which are facilitated by @263Chat, have brought to the fore the covert potential of social media platforms to drive political participation and deliberation.
- Full Text:
Evictions, migrations and epidemiology in Gokwe during the colonial era
- Authors: Mudzimu, Asa
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6946 , vital:21203
- Description: Gokwe, being infested with tsetse and mosquito was seen as a ‘diseased’ environment by the Europeans. Thus, colonial anti-disease campaigns were introduced during the first decade of the 20th century. Initially, the campaigns sought to address economic challenges in the colony as they involved African relocations for the benefit of the Europeans. However, this study argues that these anti-disease campaigns were modified with time and space. The key thrust of the paper is to examine the imbrication between evictions, migrations and disease control in the context of colonial public health system. Apartfrom examining the development of Western medical practices in Gokwe the dissertation explores how this colonial public health system coalesced or clashed with African worldviews. Gokwe matters as a ‘frontier’ society in many senses. Given colonial efforts to occupy Gokwe and the influx of new evictees and migrants in the 1960s, the study depicts Gokwe as a frontier. The study sees evictions and displacements as programmes tailored to arrest tsetse and the associated diseases in the Zambezi Valley.
- Full Text:
- Authors: Mudzimu, Asa
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6946 , vital:21203
- Description: Gokwe, being infested with tsetse and mosquito was seen as a ‘diseased’ environment by the Europeans. Thus, colonial anti-disease campaigns were introduced during the first decade of the 20th century. Initially, the campaigns sought to address economic challenges in the colony as they involved African relocations for the benefit of the Europeans. However, this study argues that these anti-disease campaigns were modified with time and space. The key thrust of the paper is to examine the imbrication between evictions, migrations and disease control in the context of colonial public health system. Apartfrom examining the development of Western medical practices in Gokwe the dissertation explores how this colonial public health system coalesced or clashed with African worldviews. Gokwe matters as a ‘frontier’ society in many senses. Given colonial efforts to occupy Gokwe and the influx of new evictees and migrants in the 1960s, the study depicts Gokwe as a frontier. The study sees evictions and displacements as programmes tailored to arrest tsetse and the associated diseases in the Zambezi Valley.
- Full Text:
Jah Hills
- Authors: Slasha, Unathi
- Date: 2017
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7157 , vital:21222
- Description: Jah Hills is alone in Kwaf Indoda bush, waiting for elders to come, burn ibhuma and deliver him home. Two weeks before he departs from his initiation period, he is seduced by igqwirha. When he fails to satisfy her appetite, he gets ‘abducted and turned into isithunzela. One night, he narrowly escapes and finds his way back. But the experience at home is gruesome; they drive him away and want his death. My novel is fast paced, accumulating speed as it proceeds. It is formally experimental, drawing on forms that have gone before and trying to usher in a new manner of writing and looking at the world. It is told through the eyes of isithunzela that Jah Hills has become. It makes use of Nguni folklore, reimagined and subverted so it fits the character’s unearthly vision. Certain characters and moments from Nguni folktales are borrowed and appear throughout the text. Stylistically I draw extensively from the work of Sony Lab’ou Tansi, Taban Lo Liyong, Dambudzo Marechera, D.O. Fagunwa and Amos Tutuola.
- Full Text:
- Authors: Slasha, Unathi
- Date: 2017
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7157 , vital:21222
- Description: Jah Hills is alone in Kwaf Indoda bush, waiting for elders to come, burn ibhuma and deliver him home. Two weeks before he departs from his initiation period, he is seduced by igqwirha. When he fails to satisfy her appetite, he gets ‘abducted and turned into isithunzela. One night, he narrowly escapes and finds his way back. But the experience at home is gruesome; they drive him away and want his death. My novel is fast paced, accumulating speed as it proceeds. It is formally experimental, drawing on forms that have gone before and trying to usher in a new manner of writing and looking at the world. It is told through the eyes of isithunzela that Jah Hills has become. It makes use of Nguni folklore, reimagined and subverted so it fits the character’s unearthly vision. Certain characters and moments from Nguni folktales are borrowed and appear throughout the text. Stylistically I draw extensively from the work of Sony Lab’ou Tansi, Taban Lo Liyong, Dambudzo Marechera, D.O. Fagunwa and Amos Tutuola.
- Full Text:
Safe space online: the construction of intersectional safety in a South African feminist Facebook group
- Authors: Roux, Kayla
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/8044 , vital:21338
- Description: In this thesis I investigate the construction of an intersectional ‘safe space’ in a closed South African feminist community on the social networking site Facebook. Drawing on my own experience as a group member, observations of group dynamics, focus group interviews with administrators, and interviews with past and present members, I discuss the practices and guidelines employed to ensure the safety and intersectionality of the group. This research spans a period of more than two years, and there were a number of developments in the group over this time. It is a relatively large and well-established feminist Facebook group in South Africa which enforces an intersectional approach to social justice, and it is explicitly formulated and closely monitored so that marginalised voices are privileged in group interactions. Despite the best efforts of group moderators, however, interactions between the privileged and the marginalised tend to reproduce existing power inequalities and jeopardise the safety of those the group is meant to serve. Although some interview participants feel that safe space practices such as the call-out system and exclusionary groups and posts serve to fragment the group and cause conflict, these complaints mainly originate from white women who were required to acknowledge their unearned privilege. Their presence in the group and the problem of ‘white derailment’ makes the space feel unsafe for many POC. Ultimately, a splinter group exclusively for POC was formed in order to provide a safer space for feminists of colour to find solidarity and support, discuss issues affecting them, and do the important and necessary work of selfdefinition. I conclude that while these spaces are limited - and absolute safety can never be guaranteed - these exclusive spaces are an integral starting point in the development of a transversal intersectional politics of solidarity between different actors and movements that share the same values.
- Full Text:
- Authors: Roux, Kayla
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/8044 , vital:21338
- Description: In this thesis I investigate the construction of an intersectional ‘safe space’ in a closed South African feminist community on the social networking site Facebook. Drawing on my own experience as a group member, observations of group dynamics, focus group interviews with administrators, and interviews with past and present members, I discuss the practices and guidelines employed to ensure the safety and intersectionality of the group. This research spans a period of more than two years, and there were a number of developments in the group over this time. It is a relatively large and well-established feminist Facebook group in South Africa which enforces an intersectional approach to social justice, and it is explicitly formulated and closely monitored so that marginalised voices are privileged in group interactions. Despite the best efforts of group moderators, however, interactions between the privileged and the marginalised tend to reproduce existing power inequalities and jeopardise the safety of those the group is meant to serve. Although some interview participants feel that safe space practices such as the call-out system and exclusionary groups and posts serve to fragment the group and cause conflict, these complaints mainly originate from white women who were required to acknowledge their unearned privilege. Their presence in the group and the problem of ‘white derailment’ makes the space feel unsafe for many POC. Ultimately, a splinter group exclusively for POC was formed in order to provide a safer space for feminists of colour to find solidarity and support, discuss issues affecting them, and do the important and necessary work of selfdefinition. I conclude that while these spaces are limited - and absolute safety can never be guaranteed - these exclusive spaces are an integral starting point in the development of a transversal intersectional politics of solidarity between different actors and movements that share the same values.
- Full Text:
“She is my sister although she’s got factory faults”: a psychosocial study of Xhosa women’s sister-sister relationships
- Authors: Moifo, Hunadi Senkoane
- Date: 2017
- Subjects: Xhosa (African people) -- Rites and ceremonies , Xhosa (African people) -- Social life and customs , Sisters -- South Africa -- Case studies , Xhosa (African people) -- Psychology , Women, Black -- South Africa -- Eastern Cape -- Psychology , Women, Black -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4443 , vital:20671
- Description: The current study examines the constructions that Black, Xhosa women from the working class and in middle adulthood draw on to make meaning of their sister-sister relationships. In addition to this, it aims to uncover their motivations for investing in these meanings. It makes use of a psychosocial theoretical framework that draws on discursive psychology and psychoanalysis. Discursive psychology is used to analyse the constructions the participants used to make meaning of their relationship, while psychoanalysis is used to interpret their investments in these constructions. Six participants were interviewed using semi-structured interviews. The findings emphasise the psychosocial nature of the participants’ sisterly relationships, as caught between ‘inner’ world of feelings and emotions and the ‘outer’ world of social practices and expectations. Their narratives pointed to the obligatory nature of the sister-sister relationship, which drives participants to downplay the hatred or dislike that is present in their relationship and to emphasise traditional scripts of helping each other, promoting solidarity amongst sisters and other women. The analysis highlights the ways in which the participants negotiate and express their gender roles through sistering, reinforcing and challenging the traditional view of femininity and as a result providing for multiple femininities. In addition to these, the findings show that women may choose specific narratives to construct their sister-sister relationships as they allow them to feel safe and in control of their lives. Using psychoanalysis alongside discursive psychology enables the findings to illustrate how the participants invest in different constructions of their relationship in ways that are influenced by their values and life histories.
- Full Text:
- Authors: Moifo, Hunadi Senkoane
- Date: 2017
- Subjects: Xhosa (African people) -- Rites and ceremonies , Xhosa (African people) -- Social life and customs , Sisters -- South Africa -- Case studies , Xhosa (African people) -- Psychology , Women, Black -- South Africa -- Eastern Cape -- Psychology , Women, Black -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4443 , vital:20671
- Description: The current study examines the constructions that Black, Xhosa women from the working class and in middle adulthood draw on to make meaning of their sister-sister relationships. In addition to this, it aims to uncover their motivations for investing in these meanings. It makes use of a psychosocial theoretical framework that draws on discursive psychology and psychoanalysis. Discursive psychology is used to analyse the constructions the participants used to make meaning of their relationship, while psychoanalysis is used to interpret their investments in these constructions. Six participants were interviewed using semi-structured interviews. The findings emphasise the psychosocial nature of the participants’ sisterly relationships, as caught between ‘inner’ world of feelings and emotions and the ‘outer’ world of social practices and expectations. Their narratives pointed to the obligatory nature of the sister-sister relationship, which drives participants to downplay the hatred or dislike that is present in their relationship and to emphasise traditional scripts of helping each other, promoting solidarity amongst sisters and other women. The analysis highlights the ways in which the participants negotiate and express their gender roles through sistering, reinforcing and challenging the traditional view of femininity and as a result providing for multiple femininities. In addition to these, the findings show that women may choose specific narratives to construct their sister-sister relationships as they allow them to feel safe and in control of their lives. Using psychoanalysis alongside discursive psychology enables the findings to illustrate how the participants invest in different constructions of their relationship in ways that are influenced by their values and life histories.
- Full Text:
Accelerated development programmes for Black academics: Interrupting or reproducing social and cultural dominance?
- Authors: Booi, Masixole
- Date: 2016
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/3338 , vital:20483
- Description: A wide body of research literature on transformation of higher education institutions in South Africa has focused on institutional reform and restructuring, change in employment legislation and policies, transforming institutional culture(s) and student and staff demographics (Portnoi, 2009:373; Viljoen and Rothmann, 2002:3; Badat, 2007; 2010; Cloete, Muller, Makgoba and Ekong, 1997; Nieman, 2010). The literature on transformation of higher education institutions shows that the underrepresentation, recruiting and retaining of blacks and women in senior posts is still the major challenge faced by the project of transforming higher education, particularly in Historically White Institutions (HWIs). Universities have introduced a variety of ‘accelerated development’ programmes to meet this challenge and accelerate the entry into academia of black academics. The present study draws on Pierre Bourdieu’s notions of cultural capital, field and social capital to interpret the lived experiences of participants in the Accelerated Development Programme (ADP) of one HWI. In particular the study is interested in how, in the participants’ experience, they, as members of the programme, have or have not been able to contribute to the transformation of the culture(s) of the institution. The study critically examines the assumption that the institutional practices, values and norms can be changed only by socialising ‘new’ lecturers into an already existing dominant culture rather than seeing the need to socialise existing lecturers into a new culture informed by a democratic ethos.
- Full Text:
- Authors: Booi, Masixole
- Date: 2016
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/3338 , vital:20483
- Description: A wide body of research literature on transformation of higher education institutions in South Africa has focused on institutional reform and restructuring, change in employment legislation and policies, transforming institutional culture(s) and student and staff demographics (Portnoi, 2009:373; Viljoen and Rothmann, 2002:3; Badat, 2007; 2010; Cloete, Muller, Makgoba and Ekong, 1997; Nieman, 2010). The literature on transformation of higher education institutions shows that the underrepresentation, recruiting and retaining of blacks and women in senior posts is still the major challenge faced by the project of transforming higher education, particularly in Historically White Institutions (HWIs). Universities have introduced a variety of ‘accelerated development’ programmes to meet this challenge and accelerate the entry into academia of black academics. The present study draws on Pierre Bourdieu’s notions of cultural capital, field and social capital to interpret the lived experiences of participants in the Accelerated Development Programme (ADP) of one HWI. In particular the study is interested in how, in the participants’ experience, they, as members of the programme, have or have not been able to contribute to the transformation of the culture(s) of the institution. The study critically examines the assumption that the institutional practices, values and norms can be changed only by socialising ‘new’ lecturers into an already existing dominant culture rather than seeing the need to socialise existing lecturers into a new culture informed by a democratic ethos.
- Full Text:
Population assessment and feeding ecology of brown hyenas (hyaena brunnea) in Mountain Zebra National Park, Eastern Cape, South Africa
- Authors: Comley, Jessica
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/2862 , vital:20336
- Description: The development of many small (<400 km2), enclosed game reserves in the Eastern Cape Province of South Africa over the past 25 years has contributed greatly to the conservation of large carnivores. However, the brown hyena (Hyaena brunnea) is one of the least studied large carnivores in South Africa. Nevertheless, the reintroduction of this species (n=3 in 2008) into Mountain Zebra National Park (MZNP) provided the perfect opportunity to broaden our understanding of the role that this carnivore plays in an enclosed system. Camera trap data was collected for just over a year from April 2014 to April 2015 and brown hyena density estimates were calculated using spatially explicit capture-recapture analysis. Left-side images of brown hyenas were used in the analysis and 12 individuals were positively identified. The best model to estimate brown hyena density included a road covariate and estimated brown hyena density to be 6-10 individuals/100 km2 (an absolute abundance of between 12 and 21 individuals), which is higher than densities calculated for brown hyenas in other arid, open systems. In, addition, brown hyena scat samples were collected over a five year period from April 2011 to June 2015 and standard techniques for scat analysis were used to identify prey items. Cheetah (Acinonyx jubatus) and lion (Panthera leo) kill site data were used to investigate the impacts of these species on the diet of brown hyenas. Before the release of lions brown hyenas predominantly scavenged on medium-sized mammals, which was what the cheetahs mainly killed. However, after the release of the lions, brown hyenas predominantly scavenged on large mammals, which was what the lions primarily killed. The results from my study indicate that brown hyenas are most likely reaching high densities in enclosed systems, due to increased scavenging opportunities provided by other large predators. The rapid increase of brown hyena densities from small founder populations in enclosed reserves could result in inbreeding. Therefore, in order to successfully conserve brown hyenas and other large carnivores in South Africa, continual post-release monitoring and possible implementation of meta-population management schemes is required.
- Full Text:
- Authors: Comley, Jessica
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/2862 , vital:20336
- Description: The development of many small (<400 km2), enclosed game reserves in the Eastern Cape Province of South Africa over the past 25 years has contributed greatly to the conservation of large carnivores. However, the brown hyena (Hyaena brunnea) is one of the least studied large carnivores in South Africa. Nevertheless, the reintroduction of this species (n=3 in 2008) into Mountain Zebra National Park (MZNP) provided the perfect opportunity to broaden our understanding of the role that this carnivore plays in an enclosed system. Camera trap data was collected for just over a year from April 2014 to April 2015 and brown hyena density estimates were calculated using spatially explicit capture-recapture analysis. Left-side images of brown hyenas were used in the analysis and 12 individuals were positively identified. The best model to estimate brown hyena density included a road covariate and estimated brown hyena density to be 6-10 individuals/100 km2 (an absolute abundance of between 12 and 21 individuals), which is higher than densities calculated for brown hyenas in other arid, open systems. In, addition, brown hyena scat samples were collected over a five year period from April 2011 to June 2015 and standard techniques for scat analysis were used to identify prey items. Cheetah (Acinonyx jubatus) and lion (Panthera leo) kill site data were used to investigate the impacts of these species on the diet of brown hyenas. Before the release of lions brown hyenas predominantly scavenged on medium-sized mammals, which was what the cheetahs mainly killed. However, after the release of the lions, brown hyenas predominantly scavenged on large mammals, which was what the lions primarily killed. The results from my study indicate that brown hyenas are most likely reaching high densities in enclosed systems, due to increased scavenging opportunities provided by other large predators. The rapid increase of brown hyena densities from small founder populations in enclosed reserves could result in inbreeding. Therefore, in order to successfully conserve brown hyenas and other large carnivores in South Africa, continual post-release monitoring and possible implementation of meta-population management schemes is required.
- Full Text:
The effect of interest rates on investment spending: an empirical analysis of South Africa
- Authors: Dakin, Nicholas John
- Date: 2016
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1131 , http://hdl.handle.net/10962/d1021174
- Description: This thesis investigates the nature and strength of the relationship between short-, medium-, and long-term real interest rates and capital investment spending at both the aggregate and disaggregate levels in South Africa in order to determine whether changes in the real interest rate affect the level of capital investment in the economy. This thesis used quarterly data for the period 1987 to 2013. VAR modelling, variance decompositions, impulse response functions and Granger causality tests are used to explore the nature and strength of the relationship between interest rates and investment spending. It is found that interest rates explain very little of the variation in investment spending and seem to have little impact on investment (of any type). Furthermore, short-, medium- and long-term interest rates have different effects on the level of investment spending. A rise in short-term interest rates appears to decrease the level of investment spending in the long-run, whereas a rise in long-term interest rates results in an increase in investment.
- Full Text:
- Authors: Dakin, Nicholas John
- Date: 2016
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1131 , http://hdl.handle.net/10962/d1021174
- Description: This thesis investigates the nature and strength of the relationship between short-, medium-, and long-term real interest rates and capital investment spending at both the aggregate and disaggregate levels in South Africa in order to determine whether changes in the real interest rate affect the level of capital investment in the economy. This thesis used quarterly data for the period 1987 to 2013. VAR modelling, variance decompositions, impulse response functions and Granger causality tests are used to explore the nature and strength of the relationship between interest rates and investment spending. It is found that interest rates explain very little of the variation in investment spending and seem to have little impact on investment (of any type). Furthermore, short-, medium- and long-term interest rates have different effects on the level of investment spending. A rise in short-term interest rates appears to decrease the level of investment spending in the long-run, whereas a rise in long-term interest rates results in an increase in investment.
- Full Text:
A light-emitting-diode pulsing system for measurement of time-resolved luminescence
- Authors: Uriri, Solomon Akpore
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:20976 , http://hdl.handle.net/10962/5788
- Description: A new light-emitting-diode based pulsing system for measurement of time-resolved luminescence has been developed. The light-emitting-diodes are pulsed at various pulse-widths by a 555-timer operated as a monostable multivibrator. The light-emitting-diodes are arranged in a dural holder connected in parallel in sets of four, each containing four diodes in series. The output pulse from the 555-timer is fed into an 2N7000 MOSFET to produce a pulse-current of 500 mA to drive the set of 16 light-emitting-diodes. This size of current is sufficient to drive the diodes with each driven at a pulse-current of 90 mA with a possible maximum of 110 mA per diode. A multichannel scaler is used to trigger the pulsing system and to record data at selectable dwell times. The system is capable of generating pulse-widths in the range of microseconds upwards.
- Full Text:
- Authors: Uriri, Solomon Akpore
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:20976 , http://hdl.handle.net/10962/5788
- Description: A new light-emitting-diode based pulsing system for measurement of time-resolved luminescence has been developed. The light-emitting-diodes are pulsed at various pulse-widths by a 555-timer operated as a monostable multivibrator. The light-emitting-diodes are arranged in a dural holder connected in parallel in sets of four, each containing four diodes in series. The output pulse from the 555-timer is fed into an 2N7000 MOSFET to produce a pulse-current of 500 mA to drive the set of 16 light-emitting-diodes. This size of current is sufficient to drive the diodes with each driven at a pulse-current of 90 mA with a possible maximum of 110 mA per diode. A multichannel scaler is used to trigger the pulsing system and to record data at selectable dwell times. The system is capable of generating pulse-widths in the range of microseconds upwards.
- Full Text:
An in-silico investigation of Morita-Baylis-Hillman accessible heterocyclic analogues for applications as novel HIV-1 C protease inhibitors
- Authors: Sigauke, Lester Takunda
- Date: 2015
- Subjects: Protease inhibitors , Heterocyclic compounds , HIV (Viruses) , HIV infections , Drug resistance , Cheminformatics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4152 , http://hdl.handle.net/10962/d1017913
- Description: Cheminformatic approaches have been employed to optimize the bis-coumarin scaffold identified by Onywera et al. (2012) as a potential hit against the protease HIV-1 protein. The Open Babel library of commands was used to access functions that were incorporated into a markov chain recursive program that generated 17750 analogues of the bis-coumarin scaffold. The Morita-Baylis-Hillman accessible heterocycles were used to introduce structural diversity within the virtual library. In silico high through-put virtual screening using AutoDock Vina was used to rapidly screen the virtual library ligand set against 61 protease models built by Onywera et al. (2012). CheS-Mapper computed a principle component analysis of the compounds based on 13 selected chemical descriptors. The compounds were plotted against the principle component analysis within a 3 dimensional chemical space in order to inspect the diversity of the virtual library. The physicochemical properties and binding affinities were used to identify the top 3 performing ligands. ACPYPE was used to inspect the constitutional properties and eliminated virtual compounds that possessed open valences. Chromene based ligand 805 and ligand 6610 were selected as the lead candidates from the high-throughput virtual screening procedure we employed. Molecular dynamic simulations of the lead candidates performed for 5 ns allowed the stability of the ligand protein complexes with protease model 305152. The free energy of binding of the leads with protease model 305152 was computed over the first 50 ps of simulation using the molecular mechanics Poisson-Boltzmann method. Analysis structural features and energy profiles from molecular dynamic simulations of the protein–ligand complexes indicated that although ligand 805 had a weaker binding affinity in terms of docking, it outperformed ligand 6610 in terms of complex stability and free energy of binding. Medicinal chemistry approaches will be used to optimize the lead candidates before their analogues will be synthesized and assayed for in vivo protease activity.
- Full Text:
- Authors: Sigauke, Lester Takunda
- Date: 2015
- Subjects: Protease inhibitors , Heterocyclic compounds , HIV (Viruses) , HIV infections , Drug resistance , Cheminformatics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4152 , http://hdl.handle.net/10962/d1017913
- Description: Cheminformatic approaches have been employed to optimize the bis-coumarin scaffold identified by Onywera et al. (2012) as a potential hit against the protease HIV-1 protein. The Open Babel library of commands was used to access functions that were incorporated into a markov chain recursive program that generated 17750 analogues of the bis-coumarin scaffold. The Morita-Baylis-Hillman accessible heterocycles were used to introduce structural diversity within the virtual library. In silico high through-put virtual screening using AutoDock Vina was used to rapidly screen the virtual library ligand set against 61 protease models built by Onywera et al. (2012). CheS-Mapper computed a principle component analysis of the compounds based on 13 selected chemical descriptors. The compounds were plotted against the principle component analysis within a 3 dimensional chemical space in order to inspect the diversity of the virtual library. The physicochemical properties and binding affinities were used to identify the top 3 performing ligands. ACPYPE was used to inspect the constitutional properties and eliminated virtual compounds that possessed open valences. Chromene based ligand 805 and ligand 6610 were selected as the lead candidates from the high-throughput virtual screening procedure we employed. Molecular dynamic simulations of the lead candidates performed for 5 ns allowed the stability of the ligand protein complexes with protease model 305152. The free energy of binding of the leads with protease model 305152 was computed over the first 50 ps of simulation using the molecular mechanics Poisson-Boltzmann method. Analysis structural features and energy profiles from molecular dynamic simulations of the protein–ligand complexes indicated that although ligand 805 had a weaker binding affinity in terms of docking, it outperformed ligand 6610 in terms of complex stability and free energy of binding. Medicinal chemistry approaches will be used to optimize the lead candidates before their analogues will be synthesized and assayed for in vivo protease activity.
- Full Text:
Modelling the spatial and genetic response of the endemic sparid: Polysteganus praeorbitalis (Pisces: Sparidae) to climate change in the Agulhas Current system
- Authors: Isemonger, Devin Neil
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54509 , vital:26576
- Description: The Scotsman Seabream, Polysteganus praeorbitalis, is one of several large, slow-growing members of the Sparidae family of fishes endemic to the Agulhas Current system in the Western Indian Ocean (WIO). Relatively little research has been conducted on this species despite its importance to both recreational and commercial line fisheries in South Africa and the drastic decline in catch per unit effort (CPUE) that has been recorded since the 1940s. Changing sea temperatures as a result of global climate change are further expected to affect the distribution and abundance of many fish species based on their thermal tolerances, life histories and population structures. The ability of these species to shift their distribution and adapt to new environments and thermal conditions will depend to some degree on the levels of genetic variation and gene flow, within and between populations. A combined approach using species distribution modelling and genetic analyses may prove to be a useful tool in investigating the potential effects of climate change on the distribution and genetic diversity of species. An ensemble species distribution model (SDM) based on 205 occurrence records and 30 years of Reynolds Optimum Interpolated (OI) sea surface temperature data was constructed to predict the distributional response of P. praeorbitalis to climate change in the Agulhas Current system. The ensemble SDM displayed a true skill statistic (TSS) of 0.975 and an area under the receiver operating curve (ROC) of 0.999, indicating good model fit. Autumn and winter minimum temperatures, as well as bathymetry, were the most important predictor variables in the majority of models, indicating that these variables may directly constrain the distribution of P. praeorbitalis. In particular, the southern range edge of this species appeared to be constrained by autumn and winter minima, with high model agreement on this range edge. Conversely, the northern range limit showed poor model agreement leading to a gradual reduction in occurrence. This indicates that this range edge may be constrained by other factors not included in the models such as species interactions. The ensemble SDM projected the current range of P. praeorbitalis to be 1500 km², smaller than the published range for this species. The model underestimated the northern range edge of this species by approximately 5° latitude when binary transformed. This is probably due to the rarity of this species in the landings of the Mozambican linefishery, which was assumed to be an indication of low abundance of P. praeorbitalis in these waters. The absence of a specimen to verify the published northern range edge of this species indicates that the northern range edge produced by this model is likely to be closer to the actual range limit of the species. A range contraction of 30% occurring at both the northern and southern edge of P. praeorbitalis’ range and range fragmentation occurring, towards its northern range edge by 2030, was predicted. These changes are modelled to be the results of cooling related to the intensification of the Port Alfred upwelling cell and of warming predicted north of the Natal Bight and in southern Mozambique. Genetic analyses of the nuclear DNA (nDNA) S7 intron 1 and mitochondrial DNA (mtDNA) control region genes were carried out using 118 tissue samples of P. praeorbitalis collected at four main localities: the Eastern Cape, Transkei, southern KwaZulu-Natal and northern KwaZulu-Natal. Analyses of genetic diversity levels revealed relatively low diversity in the mtDNA dataset (Hd = 0.488; π = 0.004) and moderate levels of diversity in the nDNA dataset (Ad = 0.922; π = 0.005). The low levels of diversity observed in the mtDNA dataset might be explained by a number of factors, including high variation in spawning success, the negative effects of over-harvesting, or a recent population bottleneck. The last explanation is supported by characteristic star-shaped haplotype networks and unimodal mismatch distributions displayed by both datasets. These results, in conjunction with a significant (p = 0.005) negative Tajimas D value (-2.029) in the mtDNA dataset and significant (p = 0.0005) negative Fu’s F statistic in both the nDNA (F = -26.5) and mtDNA (F = -11.9) datasets, provide strong evidence for a recent population expansion after a bottleneck event in this species. Spatially, mtDNA diversity was highest in the Eastern Cape and lowest in the middle localities, while nDNA diversity showed the opposite pattern. These results may be indicative of differences in the sex ratio between localities, possibly as a result of the protogynous hermaphroditism that has been postulated for this species. Although pairwise comparisons and exact tests of population differentiation revealed no significant geneticdifferentiation between populations in the mtDNA dataset, there was some evidence of low levels of differentiation in the nDNA dataset. This occurred for comparisons between the Eastern Cape and Transkei (Fst = 0.039; p <0.05), and the northern KwaZulu-Natal (Fst = 0.045; p < 0.05).. This might be the result of one or a combination of factors including the effects of the Port Alfred upwelling cell on dispersal and gene flow, or the possibility of more than one spawning ground for this species promoting sub-structuring. A SAMOVA analyses run on the nDNA dataset maximised variance by grouping the Eastern Cape and southern KwaZulu-Natal together and Transkei and northern KwaZulu-Natal together in two groups. This revealed no evidence of spatial structure (p = 0.36), with only 3.30% of variation explained by this grouping. The removal of individuals below the estimated length at 50% maturity in the nDNA dataset, in order to test for temporal structure, resulted in stronger evidence of differentiation between the Eastern Cape and all other localities: Transkei (Fst = 0.081; p< 0.05), southern KwaZulu-Natal (Fst = 0.031; p<0.05), and northern KwaZulu-Natal (Fst = 0.078; p< 0.05). This indicates that some temporal genetic structure may exist between age classes within this species. The differentiation observed between the Eastern Cape and other localities, coupled with the high percentage of private haplotypes in the mtDNA dataset in this locality, indicates that this area is where P. praeorbitalis is most vulnerable to the potential negative effects of climate change on its genetic diversity. However, the vast majority of this species genetic diversity appears to reside towards the centre of its range where it is most abundant and the lack of strong genetic structure indicates high levels of gene flow. In conclusion, while P. praeorbitalis is vulnerable to range loss as a result of climate change, its genetic diversity is unlikely to be greatly affected.
- Full Text:
- Authors: Isemonger, Devin Neil
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54509 , vital:26576
- Description: The Scotsman Seabream, Polysteganus praeorbitalis, is one of several large, slow-growing members of the Sparidae family of fishes endemic to the Agulhas Current system in the Western Indian Ocean (WIO). Relatively little research has been conducted on this species despite its importance to both recreational and commercial line fisheries in South Africa and the drastic decline in catch per unit effort (CPUE) that has been recorded since the 1940s. Changing sea temperatures as a result of global climate change are further expected to affect the distribution and abundance of many fish species based on their thermal tolerances, life histories and population structures. The ability of these species to shift their distribution and adapt to new environments and thermal conditions will depend to some degree on the levels of genetic variation and gene flow, within and between populations. A combined approach using species distribution modelling and genetic analyses may prove to be a useful tool in investigating the potential effects of climate change on the distribution and genetic diversity of species. An ensemble species distribution model (SDM) based on 205 occurrence records and 30 years of Reynolds Optimum Interpolated (OI) sea surface temperature data was constructed to predict the distributional response of P. praeorbitalis to climate change in the Agulhas Current system. The ensemble SDM displayed a true skill statistic (TSS) of 0.975 and an area under the receiver operating curve (ROC) of 0.999, indicating good model fit. Autumn and winter minimum temperatures, as well as bathymetry, were the most important predictor variables in the majority of models, indicating that these variables may directly constrain the distribution of P. praeorbitalis. In particular, the southern range edge of this species appeared to be constrained by autumn and winter minima, with high model agreement on this range edge. Conversely, the northern range limit showed poor model agreement leading to a gradual reduction in occurrence. This indicates that this range edge may be constrained by other factors not included in the models such as species interactions. The ensemble SDM projected the current range of P. praeorbitalis to be 1500 km², smaller than the published range for this species. The model underestimated the northern range edge of this species by approximately 5° latitude when binary transformed. This is probably due to the rarity of this species in the landings of the Mozambican linefishery, which was assumed to be an indication of low abundance of P. praeorbitalis in these waters. The absence of a specimen to verify the published northern range edge of this species indicates that the northern range edge produced by this model is likely to be closer to the actual range limit of the species. A range contraction of 30% occurring at both the northern and southern edge of P. praeorbitalis’ range and range fragmentation occurring, towards its northern range edge by 2030, was predicted. These changes are modelled to be the results of cooling related to the intensification of the Port Alfred upwelling cell and of warming predicted north of the Natal Bight and in southern Mozambique. Genetic analyses of the nuclear DNA (nDNA) S7 intron 1 and mitochondrial DNA (mtDNA) control region genes were carried out using 118 tissue samples of P. praeorbitalis collected at four main localities: the Eastern Cape, Transkei, southern KwaZulu-Natal and northern KwaZulu-Natal. Analyses of genetic diversity levels revealed relatively low diversity in the mtDNA dataset (Hd = 0.488; π = 0.004) and moderate levels of diversity in the nDNA dataset (Ad = 0.922; π = 0.005). The low levels of diversity observed in the mtDNA dataset might be explained by a number of factors, including high variation in spawning success, the negative effects of over-harvesting, or a recent population bottleneck. The last explanation is supported by characteristic star-shaped haplotype networks and unimodal mismatch distributions displayed by both datasets. These results, in conjunction with a significant (p = 0.005) negative Tajimas D value (-2.029) in the mtDNA dataset and significant (p = 0.0005) negative Fu’s F statistic in both the nDNA (F = -26.5) and mtDNA (F = -11.9) datasets, provide strong evidence for a recent population expansion after a bottleneck event in this species. Spatially, mtDNA diversity was highest in the Eastern Cape and lowest in the middle localities, while nDNA diversity showed the opposite pattern. These results may be indicative of differences in the sex ratio between localities, possibly as a result of the protogynous hermaphroditism that has been postulated for this species. Although pairwise comparisons and exact tests of population differentiation revealed no significant geneticdifferentiation between populations in the mtDNA dataset, there was some evidence of low levels of differentiation in the nDNA dataset. This occurred for comparisons between the Eastern Cape and Transkei (Fst = 0.039; p <0.05), and the northern KwaZulu-Natal (Fst = 0.045; p < 0.05).. This might be the result of one or a combination of factors including the effects of the Port Alfred upwelling cell on dispersal and gene flow, or the possibility of more than one spawning ground for this species promoting sub-structuring. A SAMOVA analyses run on the nDNA dataset maximised variance by grouping the Eastern Cape and southern KwaZulu-Natal together and Transkei and northern KwaZulu-Natal together in two groups. This revealed no evidence of spatial structure (p = 0.36), with only 3.30% of variation explained by this grouping. The removal of individuals below the estimated length at 50% maturity in the nDNA dataset, in order to test for temporal structure, resulted in stronger evidence of differentiation between the Eastern Cape and all other localities: Transkei (Fst = 0.081; p< 0.05), southern KwaZulu-Natal (Fst = 0.031; p<0.05), and northern KwaZulu-Natal (Fst = 0.078; p< 0.05). This indicates that some temporal genetic structure may exist between age classes within this species. The differentiation observed between the Eastern Cape and other localities, coupled with the high percentage of private haplotypes in the mtDNA dataset in this locality, indicates that this area is where P. praeorbitalis is most vulnerable to the potential negative effects of climate change on its genetic diversity. However, the vast majority of this species genetic diversity appears to reside towards the centre of its range where it is most abundant and the lack of strong genetic structure indicates high levels of gene flow. In conclusion, while P. praeorbitalis is vulnerable to range loss as a result of climate change, its genetic diversity is unlikely to be greatly affected.
- Full Text:
Rehab is for quitters
- Authors: Maharaj, Keshav
- Date: 2014
- Subjects: Creative writing (Higher education) Short stories, South African (English) -- 21st century South African fiction (English) -- 21st century English language -- Writing
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:5972 , http://hdl.handle.net/10962/d1011901
- Description: My collection has the common theme of addiction: addictive personalities strung across the pages. Not only the usual addictions such as the daily-ritualized beer or joint, but also the pain of addiction to anti-social habits, pathologies, forbidden love, etc. I try to capture the behavior and life that surrounds addictions too: relationships, rehab, criminal behavior, all sorts of abuse, etc. Some of the stories are heavy-handed, slapping the reader in the face, some are subtler. Some are told with lightness and humor, some with gravity.
- Full Text:
- Authors: Maharaj, Keshav
- Date: 2014
- Subjects: Creative writing (Higher education) Short stories, South African (English) -- 21st century South African fiction (English) -- 21st century English language -- Writing
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:5972 , http://hdl.handle.net/10962/d1011901
- Description: My collection has the common theme of addiction: addictive personalities strung across the pages. Not only the usual addictions such as the daily-ritualized beer or joint, but also the pain of addiction to anti-social habits, pathologies, forbidden love, etc. I try to capture the behavior and life that surrounds addictions too: relationships, rehab, criminal behavior, all sorts of abuse, etc. Some of the stories are heavy-handed, slapping the reader in the face, some are subtler. Some are told with lightness and humor, some with gravity.
- Full Text:
Some general convergence theorems on fixed points
- Authors: Panicker, Rekha Manoj
- Date: 2014
- Subjects: Fixed point theory , Convergence , Coincidence theory (Mathematics)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5426 , http://hdl.handle.net/10962/d1013112
- Description: In this thesis, we first obtain coincidence and common fixed point theorems for a pair of generalized non-expansive type mappings in a normed space. Then we discuss two types of convergence theorems, namely, the convergence of Mann iteration procedures and the convergence and stability of fixed points. In addition, we discuss the viscosity approximations generated by (ψ ,ϕ)-weakly contractive mappings and a sequence of non-expansive mappings and then establish Browder and Halpern type convergence theorems on Banach spaces. With regard to iteration procedures, we obtain a result on the convergence of Mann iteration for generalized non-expansive type mappings in a Banach space which satisfies Opial's condition. And, in the case of stability of fixed points, we obtain a number of stability results for the sequence of (ψ,ϕ)- weakly contractive mappings and the sequence of their corresponding fixed points in metric and 2-metric spaces. We also present a generalization of Fraser and Nadler type stability theorems in 2-metric spaces involving a sequence of metrics.
- Full Text:
- Authors: Panicker, Rekha Manoj
- Date: 2014
- Subjects: Fixed point theory , Convergence , Coincidence theory (Mathematics)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5426 , http://hdl.handle.net/10962/d1013112
- Description: In this thesis, we first obtain coincidence and common fixed point theorems for a pair of generalized non-expansive type mappings in a normed space. Then we discuss two types of convergence theorems, namely, the convergence of Mann iteration procedures and the convergence and stability of fixed points. In addition, we discuss the viscosity approximations generated by (ψ ,ϕ)-weakly contractive mappings and a sequence of non-expansive mappings and then establish Browder and Halpern type convergence theorems on Banach spaces. With regard to iteration procedures, we obtain a result on the convergence of Mann iteration for generalized non-expansive type mappings in a Banach space which satisfies Opial's condition. And, in the case of stability of fixed points, we obtain a number of stability results for the sequence of (ψ,ϕ)- weakly contractive mappings and the sequence of their corresponding fixed points in metric and 2-metric spaces. We also present a generalization of Fraser and Nadler type stability theorems in 2-metric spaces involving a sequence of metrics.
- Full Text:
Hungry but silent: a content analysis of media reporting on the 2011-2012 famine in Somalia
- Authors: Stupart, Richard
- Date: 2013
- Subjects: Famines -- Political aspects -- Somalia Somalia -- In mass media Famines in mass media
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3500 , http://hdl.handle.net/10962/d1006054
- Description: This dissertation examines media coverage of the 2011- 2012 famine in Somalia by the websites of BBC News, CNN and Al Jazeera. Using both quantitative and qualitative content analyses, it asks why coverage of the famine began as late as it did, despite ample evidence of the coming famine. It further surveys the famine-related news reports for evidence of four paradigms through which the causes of famine can be understood; as a Malthusian competition between population and land, as a failure of food entitlements as conceived of by Sen (1981), as critical political event (Edkins, 2004), or as an issue of criminality (Alex de Waal, 2008). Findings include a dramatic silencing of victim’s accounts of famine, despite a reliance on their photographic images, as well as an overwhelming preference for Malthusian accounts of the famine. Late media coverage is explored via a new-values paradigm which links the sudden outburst of media coverage for the famine to a formal UN declaration, and suggests that this may have created a new elite-relevance to the event which did not exist before, and therefore making it of relevance to domestic publics.
- Full Text:
- Authors: Stupart, Richard
- Date: 2013
- Subjects: Famines -- Political aspects -- Somalia Somalia -- In mass media Famines in mass media
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3500 , http://hdl.handle.net/10962/d1006054
- Description: This dissertation examines media coverage of the 2011- 2012 famine in Somalia by the websites of BBC News, CNN and Al Jazeera. Using both quantitative and qualitative content analyses, it asks why coverage of the famine began as late as it did, despite ample evidence of the coming famine. It further surveys the famine-related news reports for evidence of four paradigms through which the causes of famine can be understood; as a Malthusian competition between population and land, as a failure of food entitlements as conceived of by Sen (1981), as critical political event (Edkins, 2004), or as an issue of criminality (Alex de Waal, 2008). Findings include a dramatic silencing of victim’s accounts of famine, despite a reliance on their photographic images, as well as an overwhelming preference for Malthusian accounts of the famine. Late media coverage is explored via a new-values paradigm which links the sudden outburst of media coverage for the famine to a formal UN declaration, and suggests that this may have created a new elite-relevance to the event which did not exist before, and therefore making it of relevance to domestic publics.
- Full Text:
Movements of sub-adult sicklefin lemon sharks Negaprion acutidens in a remote Indian Ocean atoll
- Authors: Filmalter, John David
- Date: 2012
- Subjects: Silky shark , Silky shark -- Habitat , Sharks -- Amirante Islands (Seychelles)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5383 , http://hdl.handle.net/10962/d1018229
- Description: The sicklefin lemon shark Negaprion acutidens is a large-bodied (> 3m) coastal shark species, widely distributed in tropical and sub-tropical Indo-Pacific waters. Despite its large size and wide distribution, very little is known about its movement behaviour throughout ontogeny. The primary aim of this thesis was to gain an understanding of the movements of sub-adult N. acutidens, in and around the St. Joseph Atoll, Republic of Seychelles, to facilitate the effective conservation of this vulnerable species. A total of 22 sharks (139 – 202 cm TL) were equipped with coded acoustic transmitters and passively monitored using moored acoustic receivers for a period of 20 month from March 2009 to October 2010. The use of passive acoustic telemetry arrays to study behavioural ecology has increased in popularity in recent years and been successfully applied to study a host of teleost and elasmobranch species in a diversity of habitats, ranging from sheltered estuaries to the offshore pelagic environment. However, the practicalities of designing an effective network of receivers to optimally monitor animal movements can be challenging. In this study the receiver array was optimised through a series of incremental steps to achieve an efficient design that allowed for the specific objectives to be addressed. The specific objectives of this study were to i) gain an understanding of the long term space use patterns and site fidelity of sub-adult N. acutidens within degree of use of the St. Joseph Atoll lagoon and surrounding habitats, and ii) investigate their short term behavioural patterns in response to natural rhythmic cycles. The important role the atoll plays in the sub-adult stage of this species was demonstrated by the very low numbers of detections outside the atoll compared to the very large numbers of detections inside the atoll. Over the course of a year the tagged sharks showed a high degree of site fidelity to the atoll, with 79 – 100% of the individuals detected during each month and 50% being detected on a near daily basis. This result provides testimony of the nursery role of the atoll and importance of these habitats in the early life history for this species. Individual area use was generally found to be restricted to the eastern part of the atoll incorporating a portion of the central deep lagoon and a nearby adjacent area of the sand flats. The movements of sub-adult N. acutidens on and off of the shallow flats surrounding the central lagoon (likely for foraging) were found to be strongly influenced by the tidal height and the diel cycle. Tagged sharks were found to utilise the flats more regularly when the tidal height was greater than 90 cm and particularly more so during the night and early morning than during daylight times. The combined results of this study expose the vulnerability of this species to rapid local depletion. Similarly, the effectiveness of spatial management measures, such as no-take marine protected areas is highlighted as an efficient tool for the future conservation of this species. In the St. Joseph Atoll in particular, the use of a multi-levelled protection approach, where the eastern portion on the atoll is completely restricted while the remaining area is utilized for non-consumptive tourism activities, could be highly effective. Future research should investigate changes in area use throughout the ontogeny of this species as well improve the understanding of the breeding site fidelity and population size of reproductive females using the St. Joseph Atoll.
- Full Text:
- Authors: Filmalter, John David
- Date: 2012
- Subjects: Silky shark , Silky shark -- Habitat , Sharks -- Amirante Islands (Seychelles)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5383 , http://hdl.handle.net/10962/d1018229
- Description: The sicklefin lemon shark Negaprion acutidens is a large-bodied (> 3m) coastal shark species, widely distributed in tropical and sub-tropical Indo-Pacific waters. Despite its large size and wide distribution, very little is known about its movement behaviour throughout ontogeny. The primary aim of this thesis was to gain an understanding of the movements of sub-adult N. acutidens, in and around the St. Joseph Atoll, Republic of Seychelles, to facilitate the effective conservation of this vulnerable species. A total of 22 sharks (139 – 202 cm TL) were equipped with coded acoustic transmitters and passively monitored using moored acoustic receivers for a period of 20 month from March 2009 to October 2010. The use of passive acoustic telemetry arrays to study behavioural ecology has increased in popularity in recent years and been successfully applied to study a host of teleost and elasmobranch species in a diversity of habitats, ranging from sheltered estuaries to the offshore pelagic environment. However, the practicalities of designing an effective network of receivers to optimally monitor animal movements can be challenging. In this study the receiver array was optimised through a series of incremental steps to achieve an efficient design that allowed for the specific objectives to be addressed. The specific objectives of this study were to i) gain an understanding of the long term space use patterns and site fidelity of sub-adult N. acutidens within degree of use of the St. Joseph Atoll lagoon and surrounding habitats, and ii) investigate their short term behavioural patterns in response to natural rhythmic cycles. The important role the atoll plays in the sub-adult stage of this species was demonstrated by the very low numbers of detections outside the atoll compared to the very large numbers of detections inside the atoll. Over the course of a year the tagged sharks showed a high degree of site fidelity to the atoll, with 79 – 100% of the individuals detected during each month and 50% being detected on a near daily basis. This result provides testimony of the nursery role of the atoll and importance of these habitats in the early life history for this species. Individual area use was generally found to be restricted to the eastern part of the atoll incorporating a portion of the central deep lagoon and a nearby adjacent area of the sand flats. The movements of sub-adult N. acutidens on and off of the shallow flats surrounding the central lagoon (likely for foraging) were found to be strongly influenced by the tidal height and the diel cycle. Tagged sharks were found to utilise the flats more regularly when the tidal height was greater than 90 cm and particularly more so during the night and early morning than during daylight times. The combined results of this study expose the vulnerability of this species to rapid local depletion. Similarly, the effectiveness of spatial management measures, such as no-take marine protected areas is highlighted as an efficient tool for the future conservation of this species. In the St. Joseph Atoll in particular, the use of a multi-levelled protection approach, where the eastern portion on the atoll is completely restricted while the remaining area is utilized for non-consumptive tourism activities, could be highly effective. Future research should investigate changes in area use throughout the ontogeny of this species as well improve the understanding of the breeding site fidelity and population size of reproductive females using the St. Joseph Atoll.
- Full Text:
The role of cluster centre principals in the Ohangwena education region in Namibia
- Authors: Nghatanga, Ponny Haggai
- Date: 2011
- Subjects: School management and organization -- Namibia -- Ohangwena School principals -- Namibia -- Ohangwena Educational leadership -- Namibia -- Ohangwena Educational change -- Namibia -- Ohangwena
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1748 , http://hdl.handle.net/10962/d1003632
- Description: The Namibian Ministry of Education introduced the School Clustering System (SCS) in 1996. The system entails the grouping of schools into clusters to facilitate the sharing of resources and expertise. One school in a group is selected to serve as the Cluster Centre and the principal of the centre is identified as the Cluster Centre Principal (CCP). This has created a new level of educational leadership which is still relatively under-researched and the primary purpose of this study is to investigate the perceptions of this new role since it is perceived to be pivotal to the effective functioning of the cluster. This study is an interpretive case study of Cluster Centres in the Komesho Circuit in the Ohangwena Educational Region. Three data collection instruments were used, namely document analysis, observation and interviews. The collected data provided insight into participants' views on the role of Cluster Centre Principals (CCPs), which shed light on the challenges faCing the roles of CCPs. The findings revealed that respondents welcomed the decentralisation of an education system that involves cluster members and parents in decision making. Furthermore, the perceived role of CCPs is perceived as delegation through participative leadership and management approaches. This involves groups in teamwork to enhance the quality of teaching and learning. The study has, however, also exposed tensions surrounding the role and function of CCPs. This is partly because the role has not been formalised and is perceived as existing in a legal vacuum. This study will benefit the Cluster Centre Principals, Inspectors of Education, Advisory Teachers, non-governmental Organisations, the community and the Ministry of Education by placing the role of Cluster Centre Principals in perspective.
- Full Text:
- Authors: Nghatanga, Ponny Haggai
- Date: 2011
- Subjects: School management and organization -- Namibia -- Ohangwena School principals -- Namibia -- Ohangwena Educational leadership -- Namibia -- Ohangwena Educational change -- Namibia -- Ohangwena
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1748 , http://hdl.handle.net/10962/d1003632
- Description: The Namibian Ministry of Education introduced the School Clustering System (SCS) in 1996. The system entails the grouping of schools into clusters to facilitate the sharing of resources and expertise. One school in a group is selected to serve as the Cluster Centre and the principal of the centre is identified as the Cluster Centre Principal (CCP). This has created a new level of educational leadership which is still relatively under-researched and the primary purpose of this study is to investigate the perceptions of this new role since it is perceived to be pivotal to the effective functioning of the cluster. This study is an interpretive case study of Cluster Centres in the Komesho Circuit in the Ohangwena Educational Region. Three data collection instruments were used, namely document analysis, observation and interviews. The collected data provided insight into participants' views on the role of Cluster Centre Principals (CCPs), which shed light on the challenges faCing the roles of CCPs. The findings revealed that respondents welcomed the decentralisation of an education system that involves cluster members and parents in decision making. Furthermore, the perceived role of CCPs is perceived as delegation through participative leadership and management approaches. This involves groups in teamwork to enhance the quality of teaching and learning. The study has, however, also exposed tensions surrounding the role and function of CCPs. This is partly because the role has not been formalised and is perceived as existing in a legal vacuum. This study will benefit the Cluster Centre Principals, Inspectors of Education, Advisory Teachers, non-governmental Organisations, the community and the Ministry of Education by placing the role of Cluster Centre Principals in perspective.
- Full Text:
Becoming a business journalist in Malawi: a case study of The Daily Times and The Nation newspapers
- Authors: Manjawira, Ellard Spencer
- Date: 2010 , 2013-07-17
- Subjects: Journalists -- Malawi Journalism -- Study and teaching -- Malawi Journalists -- Training of -- Malawi Journalists -- Education -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3506 , http://hdl.handle.net/10962/d1007440
- Description: In the past few decades, the proportion of business news compared to general news has increased tremendously across all media platforms in Africa. While the critical role played by business journalism is recognised, little is known about the people who write and report such news. Most studies on business reporting have tended to focus on analysing the content of business news, rather than the specific processes through which business journalists are socialized and trained. The findings of this study are drawn mainly from in-depth interviews with business reporters and editors at two leading newspapers in Malawi, The Daily Times and The Nation. Three major findings emerge trom the study data. First, business journalists vary in their educational and professional backgrounds, as well as the reasons for working on this beat. Second, the majority of them have no prerequisite formal education and training in business journalism and, therefore, have little knowledge and skills about what constitute good business journalism. Third, professionalism in the sub-field is constrained by a host of factors, influence of advertisers being the critical one. The study recommends that business reporting become an integral component of journalism education and training programmes to adequately prepare future generations of business journalists. In addition there is need for media houses to devise strategies to counter obstacles that business journalists face for them to effectively contribute to political economy debate. , KMBT_363
- Full Text:
- Authors: Manjawira, Ellard Spencer
- Date: 2010 , 2013-07-17
- Subjects: Journalists -- Malawi Journalism -- Study and teaching -- Malawi Journalists -- Training of -- Malawi Journalists -- Education -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3506 , http://hdl.handle.net/10962/d1007440
- Description: In the past few decades, the proportion of business news compared to general news has increased tremendously across all media platforms in Africa. While the critical role played by business journalism is recognised, little is known about the people who write and report such news. Most studies on business reporting have tended to focus on analysing the content of business news, rather than the specific processes through which business journalists are socialized and trained. The findings of this study are drawn mainly from in-depth interviews with business reporters and editors at two leading newspapers in Malawi, The Daily Times and The Nation. Three major findings emerge trom the study data. First, business journalists vary in their educational and professional backgrounds, as well as the reasons for working on this beat. Second, the majority of them have no prerequisite formal education and training in business journalism and, therefore, have little knowledge and skills about what constitute good business journalism. Third, professionalism in the sub-field is constrained by a host of factors, influence of advertisers being the critical one. The study recommends that business reporting become an integral component of journalism education and training programmes to adequately prepare future generations of business journalists. In addition there is need for media houses to devise strategies to counter obstacles that business journalists face for them to effectively contribute to political economy debate. , KMBT_363
- Full Text: