Play as an indicator of public opinion in online political commentary : a content analysis of online news forums leading up to the 2014 South African General Elections
- Authors: Moyo, Lungisani
- Date: 2018
- Subjects: Online journalism Content analysis (Communication)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/10678 , vital:35667
- Description: This study seeks to look at play as an indicator of public opinion in online political commentary of online news forums leading to the 2014 South African general elections. A qualitative content analysis was used to analyse viewers’s comments about 2014 South African general elections posted online. The concepts of critical discourse analysis, frame analysis play theory and network analysis were applied to extend and inform the study. A corpus of all commentary appended to 2014 South African general election news reports published online by Media24, Times Media Group, Mail &Guardian, Independent Newspapers, Caxton CTP, and TNA Media were selected. The study employed a purposive sampling technique and 1000 comments were extracted. The sample began four weeks before the election and ended two weeks after the event. NVIVO 11 was utilized to code these readers’ comments into their respective categories. The core findings of this thesis reflect that online readers do not just engage in play but are more interactive and participative on these online public forums and their political discourse echo political affiliations with different political parties, bearing in mind that South Africa has 13 political parties that participated and are represented in parliament. In addition, the findings revealed that, play cannot be parted with and remains inseparable with "what is real"; instead, play renews the real world by giving it sense and meaning. Play does not "re-present" nor falsify certainty but it enunciates certainty. The findings also revealed that most participants identify themselves with the ANC as the ruling party, the DA as the main opposition, the EFF as the most vocal party and then other parties. The findings further revealed that participants have different perspectives on different economic and socio-political matters such as, entertainment, slate politics, and political affiliation, cadre deployment, political bias, economic meltdown, diaspora, and western influence, abuse of power by those in high places, land reform programme, political power struggles, leadership change and corruption.
- Full Text:
- Date Issued: 2018
- Authors: Moyo, Lungisani
- Date: 2018
- Subjects: Online journalism Content analysis (Communication)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/10678 , vital:35667
- Description: This study seeks to look at play as an indicator of public opinion in online political commentary of online news forums leading to the 2014 South African general elections. A qualitative content analysis was used to analyse viewers’s comments about 2014 South African general elections posted online. The concepts of critical discourse analysis, frame analysis play theory and network analysis were applied to extend and inform the study. A corpus of all commentary appended to 2014 South African general election news reports published online by Media24, Times Media Group, Mail &Guardian, Independent Newspapers, Caxton CTP, and TNA Media were selected. The study employed a purposive sampling technique and 1000 comments were extracted. The sample began four weeks before the election and ended two weeks after the event. NVIVO 11 was utilized to code these readers’ comments into their respective categories. The core findings of this thesis reflect that online readers do not just engage in play but are more interactive and participative on these online public forums and their political discourse echo political affiliations with different political parties, bearing in mind that South Africa has 13 political parties that participated and are represented in parliament. In addition, the findings revealed that, play cannot be parted with and remains inseparable with "what is real"; instead, play renews the real world by giving it sense and meaning. Play does not "re-present" nor falsify certainty but it enunciates certainty. The findings also revealed that most participants identify themselves with the ANC as the ruling party, the DA as the main opposition, the EFF as the most vocal party and then other parties. The findings further revealed that participants have different perspectives on different economic and socio-political matters such as, entertainment, slate politics, and political affiliation, cadre deployment, political bias, economic meltdown, diaspora, and western influence, abuse of power by those in high places, land reform programme, political power struggles, leadership change and corruption.
- Full Text:
- Date Issued: 2018
Plight of small-scale citrus farmers in Ngqushwa and Addo, Eastern Cape
- Authors: Mdingi, Chulumanco
- Date: 2018
- Subjects: Farmers -- South Africa -- Peddie , Farms, Small -- South Africa -- Eastern Cape Agriculture -- South Africa -- Eastern Cape Agriculture and state -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/22714 , vital:30066
- Description: During colonial and Apartheid regimes, blacks were limited to only being subsistence and labourers of white commercial farmers, and this contributed to inequality between the two race groups. White commercial farmers were significantly supported by the previous regimes through research, finance and machinery. However, the new government has proven to have failed in properly coordinated support programmes to small-scale black farmers leading into compromised livelihoods and vulnerability. This is a qualitative study that used semi-structured interviews for data gathering with nine small-scale citrus farmers from Ngqushwa and Addo. The key findings of the study showed that small-scale citrus farmers have difficulty with accessing finance for expansion. These farmers have no other sources of income; they solely depend on the sale of their produce to make a living. Access to land still remains a challenge, thus limiting their aspirations of expansion. Access to lucrative markets is dependent on forming relationships with established white marketing and export agencies. The government programmes that some of these farmers took part in left them vulnerable due to the abrupt stopping of the rollout before the stipulated term ended. The poor coordination of the limited support that relevant institutions provide has emerged as a key factor that threatens the livelihoods of small-scale farmers.
- Full Text:
- Date Issued: 2018
- Authors: Mdingi, Chulumanco
- Date: 2018
- Subjects: Farmers -- South Africa -- Peddie , Farms, Small -- South Africa -- Eastern Cape Agriculture -- South Africa -- Eastern Cape Agriculture and state -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/22714 , vital:30066
- Description: During colonial and Apartheid regimes, blacks were limited to only being subsistence and labourers of white commercial farmers, and this contributed to inequality between the two race groups. White commercial farmers were significantly supported by the previous regimes through research, finance and machinery. However, the new government has proven to have failed in properly coordinated support programmes to small-scale black farmers leading into compromised livelihoods and vulnerability. This is a qualitative study that used semi-structured interviews for data gathering with nine small-scale citrus farmers from Ngqushwa and Addo. The key findings of the study showed that small-scale citrus farmers have difficulty with accessing finance for expansion. These farmers have no other sources of income; they solely depend on the sale of their produce to make a living. Access to land still remains a challenge, thus limiting their aspirations of expansion. Access to lucrative markets is dependent on forming relationships with established white marketing and export agencies. The government programmes that some of these farmers took part in left them vulnerable due to the abrupt stopping of the rollout before the stipulated term ended. The poor coordination of the limited support that relevant institutions provide has emerged as a key factor that threatens the livelihoods of small-scale farmers.
- Full Text:
- Date Issued: 2018
Poem to be sung
- Authors: Ndyoko, Nomtha
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63592 , vital:28444
- Description: My collection of poems expresses the complexities that exist beneath the surface of my life – my tongue, our bleak country, the politics of having a dark skin, my ancestors who speak to me in unexplainable ways, and the speech of nature – the wind, the sea, death, birds. It is in writing poems and songs that I make a space to be alive, a space to meet my ancestors and to say the unsayable. The poems move between the ordinary, the magical, the abject, and the spiritual, often expressing the contradictions that exist within life. The main influence on my poetry has come from music, from African jazz musicians such as Zim Ngqawana, Thandiswa Mazwai and Msaki Mvana. Literary influences have come from Spanish poets such as Juan Ramón Jiménez, whose strong imagery and short lines capture profound emotion, and from ancient Chinese poetry that moves in a fluid and minimal way. I have also been inspired by the African spirituality expressed in Mazisi Kunene’s poetry and the down-to-earth associative poetry of Mangaliso Buzani and Mxolisi Nyezwa.
- Full Text:
- Date Issued: 2018
- Authors: Ndyoko, Nomtha
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63592 , vital:28444
- Description: My collection of poems expresses the complexities that exist beneath the surface of my life – my tongue, our bleak country, the politics of having a dark skin, my ancestors who speak to me in unexplainable ways, and the speech of nature – the wind, the sea, death, birds. It is in writing poems and songs that I make a space to be alive, a space to meet my ancestors and to say the unsayable. The poems move between the ordinary, the magical, the abject, and the spiritual, often expressing the contradictions that exist within life. The main influence on my poetry has come from music, from African jazz musicians such as Zim Ngqawana, Thandiswa Mazwai and Msaki Mvana. Literary influences have come from Spanish poets such as Juan Ramón Jiménez, whose strong imagery and short lines capture profound emotion, and from ancient Chinese poetry that moves in a fluid and minimal way. I have also been inspired by the African spirituality expressed in Mazisi Kunene’s poetry and the down-to-earth associative poetry of Mangaliso Buzani and Mxolisi Nyezwa.
- Full Text:
- Date Issued: 2018
Point-of-care and lung ultrasound incorporated in daily practice
- Neethling, E, Roodt, F, Beck, C, Swanevelder, J L C
- Authors: Neethling, E , Roodt, F , Beck, C , Swanevelder, J L C
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/5248 , vital:44424 , http://www.samj.org.za/index.php/samj/article/view/12293
- Description: Point-of-care ultrasound (POCUS) is a fast-growing clinical utility and is becoming an essential clinical skill for all practitioners attending to critically ill patients. Ultrasound equipment is now smaller, more affordable and readily available in clinical work areas. POCUS is performed by a non-cardiologist physician at the patient’s bedside as an adjunct to the physical examination. It is easily taught, non-invasive and allows for real-time clinical information. Bedside use of ultrasound imaging aids with rapid diagnosis of severe and life-threatening pathological conditions. It can be repeated, may change clinical management, and impact on patient outcome. POCUS has a broad clinical use, including, but not limited to, focused assessed transthoracic echocardiography (FATE), lung ultrasound imaging, extended focused assessment with sonography for trauma (e-FAST), vascular access and regional blocks. It may also be extended to detect endotracheal intubation and the estimation of intracranial pressure. Assessment of cardiac pathology by POCUS, performed by a novice examiner, has been shown to compare with the gold standard of an expert. Training is paramount. The physician should know his limitations and always relate the information back to the clinical scenario and context. By incorporating POCUS as part of our armamentarium and into our daily medical practice, we might see it reach its full clinical potential, optimising patient care and improving patient outcomes.
- Full Text:
- Date Issued: 2018
- Authors: Neethling, E , Roodt, F , Beck, C , Swanevelder, J L C
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/5248 , vital:44424 , http://www.samj.org.za/index.php/samj/article/view/12293
- Description: Point-of-care ultrasound (POCUS) is a fast-growing clinical utility and is becoming an essential clinical skill for all practitioners attending to critically ill patients. Ultrasound equipment is now smaller, more affordable and readily available in clinical work areas. POCUS is performed by a non-cardiologist physician at the patient’s bedside as an adjunct to the physical examination. It is easily taught, non-invasive and allows for real-time clinical information. Bedside use of ultrasound imaging aids with rapid diagnosis of severe and life-threatening pathological conditions. It can be repeated, may change clinical management, and impact on patient outcome. POCUS has a broad clinical use, including, but not limited to, focused assessed transthoracic echocardiography (FATE), lung ultrasound imaging, extended focused assessment with sonography for trauma (e-FAST), vascular access and regional blocks. It may also be extended to detect endotracheal intubation and the estimation of intracranial pressure. Assessment of cardiac pathology by POCUS, performed by a novice examiner, has been shown to compare with the gold standard of an expert. Training is paramount. The physician should know his limitations and always relate the information back to the clinical scenario and context. By incorporating POCUS as part of our armamentarium and into our daily medical practice, we might see it reach its full clinical potential, optimising patient care and improving patient outcomes.
- Full Text:
- Date Issued: 2018
Policy responses to the sexual and reproductive health of queer youth in the global south: a systematic review
- Authors: Moore, Sarah-Ann
- Date: 2018
- Subjects: Sexual minorities -- Africa , Sexual minorities -- Asia , Sexual minorities -- Caribbean Area , Sexual health -- Developing countries , Reproductive health -- Developing countries , Reproductive health services -- Developing countries , Communication in reproductive health -- Developing countries , Sexual minorities -- Youth -- Developing countries , Medical policy -- Developing countries , Homophobia -- Developing countries
- Language: English
- Type: text , Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/63021 , vital:28355
- Description: Concerns surrounding youth sexual and reproduction health (SRH) are deeply embedded within systems of heteronormativity and ciscentrism. Resultantly, youth SRH is filtered through a lens of heterosexual and cisgender experience, rendering invisible the SRH needs of queer youth. Importantly, a failure to recognise queer experiences of SRH has implications for normative subject positions, which enjoy stronger institutional support and constitute legitimate ways of being. As such, the failure to recognise queer youth as health care subjects within policy has far reaching consequences for their sexual and reproductive health. Within this research, a sexual and reproductive justice (SRJ) framework is adopted as a backdrop for exploring policy documents related to youth SRH within selected global South countries in Africa, Asia, and the Caribbean. The final data set comprises of 1035 policy excerpts extracted from 152 policies across these three regions. Research takes the form of a systematic review utilising a deductive framing and positioning thematic analysis. Analysis identifies framings of youth SRH and explores the subject positions assigned to queer youth in relation to these identified framings, with the understanding that the manner in which youth SRH concerns are framed and queer youth are positioned within policies provides an important foundation for the implementation of SRH-related policy. Findings demonstrate that policy responses to youth SRH are most often framed in terms of a public health approach. As a result, dominant understandings of youth SRH serve to reduce youth sexuality to notions of infections and impact, which may speak to an overreliance on biomedical and population-level health models. Themes emerging within human rights framings demonstrate a presumption that rights are equally afforded to, and freely exercised by, all individuals once legally secured, failing to engage with the creation of enabling conditions to realise these rights. Although context and culture framings were by no means exhaustive examples of SRJ, they provide an interesting insight into how such SRJ concerns might be integrated into policy. Importantly, policy responses demonstrate a general pattern hypervisibility of men who have sex with men (MSM) standing in marked contrast to the invisibility of queer youth and other adult queer populations. Within policy extracts, both youth and „MSM‟ are positioned as particularly prone to poor SRH outcomes. By virtue of their inclusion within both populations, queer youth may be considered as especially at risk for, or vulnerable to, such outcomes. Relatedly, these populations (and by extension queer youth) are positioned as in need of correction, containment, and/or protection by those occupying „gatekeeping‟ positions (e.g. health care providers). The positioning of „MSM‟ solely within the context of HIV/AIDS serves to link same-sex sexualities (and at times gender non-conformity) with harmful consequences, suggesting that the positioning of queer youth could similarly serve to conflate their SRH needs with concerns around HIV/AIDS. Many of the subject positions deployed in policies serve to deny the potential for youth and „MSM‟ agency, strength, and resilience. Thus, queer youth subjects are unlikely to be positioned as empowered, autonomous, and agentic. Across both framing and positioning themes, a number of key shortcomings were observed. For the most part, policy responses fail to acknowledge the influence of social, economic, political, and cultural forces that may serve to hinder SRH outcomes according to particular contexts and the intersection of multiple and varied social identities. By obscuring these broader contextual factors and power relations, policy responses may serve to hold individual youth responsible for poor SRH outcomes. In failing to engage with the potential for diversity within youth populations, these populations are largely homogenised. Finally, the need for the creation of an enabling environment in order to secure sexual and reproductive health is largely unacknowledged within policy responses.
- Full Text:
- Date Issued: 2018
- Authors: Moore, Sarah-Ann
- Date: 2018
- Subjects: Sexual minorities -- Africa , Sexual minorities -- Asia , Sexual minorities -- Caribbean Area , Sexual health -- Developing countries , Reproductive health -- Developing countries , Reproductive health services -- Developing countries , Communication in reproductive health -- Developing countries , Sexual minorities -- Youth -- Developing countries , Medical policy -- Developing countries , Homophobia -- Developing countries
- Language: English
- Type: text , Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/63021 , vital:28355
- Description: Concerns surrounding youth sexual and reproduction health (SRH) are deeply embedded within systems of heteronormativity and ciscentrism. Resultantly, youth SRH is filtered through a lens of heterosexual and cisgender experience, rendering invisible the SRH needs of queer youth. Importantly, a failure to recognise queer experiences of SRH has implications for normative subject positions, which enjoy stronger institutional support and constitute legitimate ways of being. As such, the failure to recognise queer youth as health care subjects within policy has far reaching consequences for their sexual and reproductive health. Within this research, a sexual and reproductive justice (SRJ) framework is adopted as a backdrop for exploring policy documents related to youth SRH within selected global South countries in Africa, Asia, and the Caribbean. The final data set comprises of 1035 policy excerpts extracted from 152 policies across these three regions. Research takes the form of a systematic review utilising a deductive framing and positioning thematic analysis. Analysis identifies framings of youth SRH and explores the subject positions assigned to queer youth in relation to these identified framings, with the understanding that the manner in which youth SRH concerns are framed and queer youth are positioned within policies provides an important foundation for the implementation of SRH-related policy. Findings demonstrate that policy responses to youth SRH are most often framed in terms of a public health approach. As a result, dominant understandings of youth SRH serve to reduce youth sexuality to notions of infections and impact, which may speak to an overreliance on biomedical and population-level health models. Themes emerging within human rights framings demonstrate a presumption that rights are equally afforded to, and freely exercised by, all individuals once legally secured, failing to engage with the creation of enabling conditions to realise these rights. Although context and culture framings were by no means exhaustive examples of SRJ, they provide an interesting insight into how such SRJ concerns might be integrated into policy. Importantly, policy responses demonstrate a general pattern hypervisibility of men who have sex with men (MSM) standing in marked contrast to the invisibility of queer youth and other adult queer populations. Within policy extracts, both youth and „MSM‟ are positioned as particularly prone to poor SRH outcomes. By virtue of their inclusion within both populations, queer youth may be considered as especially at risk for, or vulnerable to, such outcomes. Relatedly, these populations (and by extension queer youth) are positioned as in need of correction, containment, and/or protection by those occupying „gatekeeping‟ positions (e.g. health care providers). The positioning of „MSM‟ solely within the context of HIV/AIDS serves to link same-sex sexualities (and at times gender non-conformity) with harmful consequences, suggesting that the positioning of queer youth could similarly serve to conflate their SRH needs with concerns around HIV/AIDS. Many of the subject positions deployed in policies serve to deny the potential for youth and „MSM‟ agency, strength, and resilience. Thus, queer youth subjects are unlikely to be positioned as empowered, autonomous, and agentic. Across both framing and positioning themes, a number of key shortcomings were observed. For the most part, policy responses fail to acknowledge the influence of social, economic, political, and cultural forces that may serve to hinder SRH outcomes according to particular contexts and the intersection of multiple and varied social identities. By obscuring these broader contextual factors and power relations, policy responses may serve to hold individual youth responsible for poor SRH outcomes. In failing to engage with the potential for diversity within youth populations, these populations are largely homogenised. Finally, the need for the creation of an enabling environment in order to secure sexual and reproductive health is largely unacknowledged within policy responses.
- Full Text:
- Date Issued: 2018
Pollution potential of on-site dry sanitation systems associated with the Mzimvubu Water Project, Eastern Cape, South Africa
- Authors: Mamera, Matthew
- Date: 2018
- Subjects: Water resources development Sustainable development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/6038 , vital:29485
- Description: Protecting the environment requires tools that can be used to monitor environmental conditions for proper sustainable management of water resources. The Mzimvubu River is the largest undeveloped river, in the poorest region of South Africa. The South African government announced plans to construct two large storage dams (Ntabelanga and Laleni) in the Tsitsa River, one of the largest tributaries to the Mzimvubu River. The dams and associated infrastructure is termed the Mzimvubu Water Project (MWP). In developing countries like South Africa, several households use pit latrines. Moreover, many people also rely upon untreated groundwater supplies for their drinking water. The shared utilization of both pit latrines and groundwater resources, can lead to human and ecological health risks from microbial and chemical pollutants. These threats can be accelerated due to a permanent rise in the water table associated with dam constructions. Four hillslope sites with pit latrines (MT1, MT2, MT3 and MT4) above 1st order tributaries to the Tsitsa River, in the vicinity of the proposed MWP were chosen for this study. The soils were described and classified at selected locations below the pit latrine and above the tributary. Undisturbed core samples were from representative soil horizons on which hydraulic properties were determined in the laboratory. Samples were also collected to determine the feacal coliform and other bacterial concentrations during a winter and summer period. Mechanistic modelling with Hydrus 2D for a 121 day period was conducted to determine the risk of pollution to surface and groundwater from the various sites. Apedal soils of the Clovelly form dominated upper slopes of MT1 and the lower slopes of MT2. A Clovelly form is hydropedologically termed a recharge soil, as morphological indicators of saturation are absent. Hydromorphic soil properties were observed in the sub-surface B horizons of a Tukulu form in MT1-3 and MT4. High clay contents and strong structure soils of the Sepane form were dominant in MT3. The soils of MT1 and MT2 are relatively sandy with slightly higher hydraulic conductivities compared to MT3 and MT4. In general higher measured faecal coliform concentrations were higher in winter as compared to summer seasons but in most sites both winter and summer seasons had counts < 1 CFU/g. The highest concentrations of total bacteria (9 x 106 CFU/ g soil) was observed in MT3-1. Other sites with potential pollution include MT3-3, with a count above 4 x 104 CFU /g soil in winter and MT1-1 with a count above 2.2 X 104 CFU /g soil in summer. In most of the sites, the E. coli bacteria detections were low (< 1 CFU/g) during both seasons. The highest value in summer of 1.8 x 102 CFU/g was observed in MT3-3 which increased from 1.2 x102 CFU/g in winter. As the soil water flow rate increase the mobility of bacteria increase as well. Hydrus simulations showed that surface water resources are threatened by pollution from MT3 and MT4 due to the prominence of lateral flow. Groundwater pollution is more likely to occur on MT1 and MT2 as the soils are freely drained. Future work should focus on the more direct measurements and modelling of the migration of bacterial pollutants from pit latrines to various water resources.
- Full Text:
- Date Issued: 2018
- Authors: Mamera, Matthew
- Date: 2018
- Subjects: Water resources development Sustainable development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/6038 , vital:29485
- Description: Protecting the environment requires tools that can be used to monitor environmental conditions for proper sustainable management of water resources. The Mzimvubu River is the largest undeveloped river, in the poorest region of South Africa. The South African government announced plans to construct two large storage dams (Ntabelanga and Laleni) in the Tsitsa River, one of the largest tributaries to the Mzimvubu River. The dams and associated infrastructure is termed the Mzimvubu Water Project (MWP). In developing countries like South Africa, several households use pit latrines. Moreover, many people also rely upon untreated groundwater supplies for their drinking water. The shared utilization of both pit latrines and groundwater resources, can lead to human and ecological health risks from microbial and chemical pollutants. These threats can be accelerated due to a permanent rise in the water table associated with dam constructions. Four hillslope sites with pit latrines (MT1, MT2, MT3 and MT4) above 1st order tributaries to the Tsitsa River, in the vicinity of the proposed MWP were chosen for this study. The soils were described and classified at selected locations below the pit latrine and above the tributary. Undisturbed core samples were from representative soil horizons on which hydraulic properties were determined in the laboratory. Samples were also collected to determine the feacal coliform and other bacterial concentrations during a winter and summer period. Mechanistic modelling with Hydrus 2D for a 121 day period was conducted to determine the risk of pollution to surface and groundwater from the various sites. Apedal soils of the Clovelly form dominated upper slopes of MT1 and the lower slopes of MT2. A Clovelly form is hydropedologically termed a recharge soil, as morphological indicators of saturation are absent. Hydromorphic soil properties were observed in the sub-surface B horizons of a Tukulu form in MT1-3 and MT4. High clay contents and strong structure soils of the Sepane form were dominant in MT3. The soils of MT1 and MT2 are relatively sandy with slightly higher hydraulic conductivities compared to MT3 and MT4. In general higher measured faecal coliform concentrations were higher in winter as compared to summer seasons but in most sites both winter and summer seasons had counts < 1 CFU/g. The highest concentrations of total bacteria (9 x 106 CFU/ g soil) was observed in MT3-1. Other sites with potential pollution include MT3-3, with a count above 4 x 104 CFU /g soil in winter and MT1-1 with a count above 2.2 X 104 CFU /g soil in summer. In most of the sites, the E. coli bacteria detections were low (< 1 CFU/g) during both seasons. The highest value in summer of 1.8 x 102 CFU/g was observed in MT3-3 which increased from 1.2 x102 CFU/g in winter. As the soil water flow rate increase the mobility of bacteria increase as well. Hydrus simulations showed that surface water resources are threatened by pollution from MT3 and MT4 due to the prominence of lateral flow. Groundwater pollution is more likely to occur on MT1 and MT2 as the soils are freely drained. Future work should focus on the more direct measurements and modelling of the migration of bacterial pollutants from pit latrines to various water resources.
- Full Text:
- Date Issued: 2018
Population connectivity of an overexploited coastal fish, Argyrosomus coronus (Sciaenidae), in an ocean-warming hotspot
- Henriques, R, Potts, Warren M, Santos, Carmen V D, Sauer, Warwick H H, Shaw, Paul W
- Authors: Henriques, R , Potts, Warren M , Santos, Carmen V D , Sauer, Warwick H H , Shaw, Paul W
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125720 , vital:35811 , https://doi.10.2989/1814232X.2018.1434090
- Description: Anthropogenic activities are recognised as causing significant impacts to marine systems at multiple levels, ranging from habitat disturbance (Pauly et al. 2005) to overfishing (Sala and Knowlton 2006) and loss of genetic diversity (Pinsky and Palumbi 2014). Exploitation and harvesting in particular are known to strongly influence fish populations and their associated ecosystems (Pauly et al. 2005), and in combination with ongoing climate change can have compound effects on the viability and long-term survival of marine fishes (Last et al. 2011). Species can react to the impacts of climate change either by shifting their distributional range or by adapting to changing conditions through individual ecological plasticity and/or local population adaptation (Briggs 2011; Last et al. 2011). However, since ecological plasticity and local adaptation have strong genetic components, overharvesting has the potential to impact the long-term adaptive ability of marine fishes by decreasing the extant genetic diversity (Allendorf et al. 2014). Therefore, understanding the impact of exploitation on genetic diversity and population substructuring is critical for predicting the likely consequences of continued exploitation and climate change.
- Full Text:
- Date Issued: 2018
- Authors: Henriques, R , Potts, Warren M , Santos, Carmen V D , Sauer, Warwick H H , Shaw, Paul W
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125720 , vital:35811 , https://doi.10.2989/1814232X.2018.1434090
- Description: Anthropogenic activities are recognised as causing significant impacts to marine systems at multiple levels, ranging from habitat disturbance (Pauly et al. 2005) to overfishing (Sala and Knowlton 2006) and loss of genetic diversity (Pinsky and Palumbi 2014). Exploitation and harvesting in particular are known to strongly influence fish populations and their associated ecosystems (Pauly et al. 2005), and in combination with ongoing climate change can have compound effects on the viability and long-term survival of marine fishes (Last et al. 2011). Species can react to the impacts of climate change either by shifting their distributional range or by adapting to changing conditions through individual ecological plasticity and/or local population adaptation (Briggs 2011; Last et al. 2011). However, since ecological plasticity and local adaptation have strong genetic components, overharvesting has the potential to impact the long-term adaptive ability of marine fishes by decreasing the extant genetic diversity (Allendorf et al. 2014). Therefore, understanding the impact of exploitation on genetic diversity and population substructuring is critical for predicting the likely consequences of continued exploitation and climate change.
- Full Text:
- Date Issued: 2018
Population ecology of Indo-Pacific bottlenose dolphins along the south-east coast of South Africa
- Vargas-Fonseca, O. Alejandra
- Authors: Vargas-Fonseca, O. Alejandra
- Date: 2018
- Subjects: Bottlenose dolphin -- South Africa -- Western Cape , Bottlenose dolphin -- Ecology -- South Africa -- Western Cape Adaptation (Biology) Population biology -- Research
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/36090 , vital:33890
- Description: In this study, the genetic population structure of the Indo-Pacific bottlenose dolphin (Tursiops aduncus) was assessed across the Agulhas and Natal Bioregions of South Africa. At the same time, the abundance, distribution and habitat use of T. aduncus was investigated using boat-based surveys along 145 km of coastline from Goukamma Marine Protected Area (MPA) to Tsitsikamma MPA along the south-east coast of South Africa (Agulhas Bioregion). Tursiops aduncus habitat preferences were assessed based on locations of sightings and recorded behaviour, and compared with those of the sympatric Indian Ocean humpback dolphins (Sousa plumbea). Strong patterns of differentiation between two sub-populations of T. aduncus were identified using double digest Restriction Site Associated DNA sequencing (ddRADseq). Pairwise FST were significant (p < 0.05) between individuals from the Agulhas and Natal Bioregions and yielded values of 0.033 for all the loci. Resource requirements, specialization and differences in habitat use possibly provided sufficient isolation allowing differentiation between sub-populations of the two ecologically distinct bioregions, despite the lack of any prominent boundary to gene flow. The two identified sub-populations should each be managed as a distinct conservation unit. The abundance estimate of T. aduncus for the study area according to an open population model (POPAN) was 2,295 individuals (95% CI: 1,157 - 4,553). Although closed models were considered inappropriate, such a model was applied for the Plettenberg Bay part of the study area in isolation, to allow for comparison with a previous estimate. The comparison showed a 72.3% decrease in abundance between the two periods: from 6,997 (95% CI: 5,230 - 9,492) in 2002 - 2003 to 1,940 (95% CI: 1,448 - 2,600) in 2014 - 2016. The mean group size also declined from 120 (range: 1 - 500) to 26 (range: 1 - 100). The results highlight the importance of assessing abundance changes at other sites to inform the revision of T. aduncus conservation status in South Africa. Tursiops aduncus were encountered throughout the area. The lowest encounter rate was along rocky and exposed shorelines. These areas were, however, associated with relatively larger group sizes and greater likelihood of travelling behaviour, whereas sandy bottomed areas, where encounter rates were highest (e.g. parts of Plettenberg Bay and the Goukamma MPA), were more likely to be associated with other behaviours (e.g. foraging, socialising). There was a relatively low association of encounters with MPAs, possibly due to the fact that two of the three MPAs in the area (Tsitsikamma and Robberg) were characterised by non-preferred habitat, namely rocky shorelines. Comparison with Sousa plumbea showed similarity in habitat preferences between the species, though S. plumbea also showed an affinity for estuarine habitats. Two areas that were highly utilised by both species were located along Goukamma MPA and the north-east section in Plettenberg Bay including the Keurbooms Estuary. The latter is unprotected and a management measure could be to create a controlled-use zone to reduce disturbance to dolphins there.
- Full Text:
- Date Issued: 2018
- Authors: Vargas-Fonseca, O. Alejandra
- Date: 2018
- Subjects: Bottlenose dolphin -- South Africa -- Western Cape , Bottlenose dolphin -- Ecology -- South Africa -- Western Cape Adaptation (Biology) Population biology -- Research
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/36090 , vital:33890
- Description: In this study, the genetic population structure of the Indo-Pacific bottlenose dolphin (Tursiops aduncus) was assessed across the Agulhas and Natal Bioregions of South Africa. At the same time, the abundance, distribution and habitat use of T. aduncus was investigated using boat-based surveys along 145 km of coastline from Goukamma Marine Protected Area (MPA) to Tsitsikamma MPA along the south-east coast of South Africa (Agulhas Bioregion). Tursiops aduncus habitat preferences were assessed based on locations of sightings and recorded behaviour, and compared with those of the sympatric Indian Ocean humpback dolphins (Sousa plumbea). Strong patterns of differentiation between two sub-populations of T. aduncus were identified using double digest Restriction Site Associated DNA sequencing (ddRADseq). Pairwise FST were significant (p < 0.05) between individuals from the Agulhas and Natal Bioregions and yielded values of 0.033 for all the loci. Resource requirements, specialization and differences in habitat use possibly provided sufficient isolation allowing differentiation between sub-populations of the two ecologically distinct bioregions, despite the lack of any prominent boundary to gene flow. The two identified sub-populations should each be managed as a distinct conservation unit. The abundance estimate of T. aduncus for the study area according to an open population model (POPAN) was 2,295 individuals (95% CI: 1,157 - 4,553). Although closed models were considered inappropriate, such a model was applied for the Plettenberg Bay part of the study area in isolation, to allow for comparison with a previous estimate. The comparison showed a 72.3% decrease in abundance between the two periods: from 6,997 (95% CI: 5,230 - 9,492) in 2002 - 2003 to 1,940 (95% CI: 1,448 - 2,600) in 2014 - 2016. The mean group size also declined from 120 (range: 1 - 500) to 26 (range: 1 - 100). The results highlight the importance of assessing abundance changes at other sites to inform the revision of T. aduncus conservation status in South Africa. Tursiops aduncus were encountered throughout the area. The lowest encounter rate was along rocky and exposed shorelines. These areas were, however, associated with relatively larger group sizes and greater likelihood of travelling behaviour, whereas sandy bottomed areas, where encounter rates were highest (e.g. parts of Plettenberg Bay and the Goukamma MPA), were more likely to be associated with other behaviours (e.g. foraging, socialising). There was a relatively low association of encounters with MPAs, possibly due to the fact that two of the three MPAs in the area (Tsitsikamma and Robberg) were characterised by non-preferred habitat, namely rocky shorelines. Comparison with Sousa plumbea showed similarity in habitat preferences between the species, though S. plumbea also showed an affinity for estuarine habitats. Two areas that were highly utilised by both species were located along Goukamma MPA and the north-east section in Plettenberg Bay including the Keurbooms Estuary. The latter is unprotected and a management measure could be to create a controlled-use zone to reduce disturbance to dolphins there.
- Full Text:
- Date Issued: 2018
Porphyrin dimers with a bridging chiral amide-bonded benzo-moiety
- Liang, Xu, Qin, Mingfeng, Zhou, Lin, Liu, Tingting, Li, Minzhi, Mack, John, Ndebele, Nobuhle, Nyokong, Tebello, Zhu, Weihua
- Authors: Liang, Xu , Qin, Mingfeng , Zhou, Lin , Liu, Tingting , Li, Minzhi , Mack, John , Ndebele, Nobuhle , Nyokong, Tebello , Zhu, Weihua
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/233433 , vital:50090 , xlink:href="https://doi.org/10.1016/j.dyepig.2018.02.043"
- Description: The facile synthesis and characterization of four porphyrin dimers which introduced stereomeric centers with chiral amide-bonded para- and meta-disubstituted benzo-moiety is reported. Trends in the electronic structures and optical and redox properties are analyzed through a comparison with theoretical calculations to explore the effect of positional isomerism of the bridging benzene rings.
- Full Text:
- Date Issued: 2018
- Authors: Liang, Xu , Qin, Mingfeng , Zhou, Lin , Liu, Tingting , Li, Minzhi , Mack, John , Ndebele, Nobuhle , Nyokong, Tebello , Zhu, Weihua
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/233433 , vital:50090 , xlink:href="https://doi.org/10.1016/j.dyepig.2018.02.043"
- Description: The facile synthesis and characterization of four porphyrin dimers which introduced stereomeric centers with chiral amide-bonded para- and meta-disubstituted benzo-moiety is reported. Trends in the electronic structures and optical and redox properties are analyzed through a comparison with theoretical calculations to explore the effect of positional isomerism of the bridging benzene rings.
- Full Text:
- Date Issued: 2018
Portfolio of original compositions
- Authors: Nabal, Ruhan
- Date: 2018
- Subjects: Composition (Music) , Music -- South Africa , Piano music , Marimba music
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/45569 , vital:38671
- Description: This Orchestral Suite was inspired by the art illustrations fromBrian Froud’s book ‘Good Faeries Bad Faeries’, where each piece in the suite represents a drawing from his book, portraying three good faeries and three bad and is in many ways a tone poem. Each piece calls for different orchestration to create individual colour to make each piece unique. Permission was not consented to include the drawings. The line-up is as follows: I. Waters of Wisdom – Overture to the faerie realm (good) II. The Thoughts of the Melancholic Faerie – She contemplates of past and present (bad) III. A Banshee Passing – the idea of death as coming unknowingly and going quietly (bad) IV. Introduction to Faerie Lilu – clearing the mist V. The Faerie Lilu – the provocateur of restlessness – she inspires wild dreams, lost fantasies and gives artists their sparks of genius (bad) VI. A Cluster of Hedgerow Pixies – They are very mischievous – in a (good) way. VII. The Dance of the Oboe Faerie – a Finale (good). While he dances, he also sings of the faerie realm. A number of composers inspired me to pursue such a work, and firstly G. Holst has left his mark on me. The first and sixth movement was inspired by the ‘Planets’. The fifth movement is actually in homage to the French composer Frank Martin with the composition ‘Petite symphonie’ where he displays the piano and harpsichord – as I have done. The second and third movements are attempts to portray film music, such as composers H. Zimmerman and D.Elfman. The last movement has many neo-classical elements displayed and I. Stravinsky had a notable influence on this piece. All the composers mentioned here have contributed in more than one piece at some point in time. The theme of the work, the magical theme, always makes me reminisce my childhood where I would in amazement wonder about my grandmothers glorious garden in search of all that is magical, and composing this took me back to that time of innocent, child-like wonder
- Full Text:
- Date Issued: 2018
- Authors: Nabal, Ruhan
- Date: 2018
- Subjects: Composition (Music) , Music -- South Africa , Piano music , Marimba music
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/45569 , vital:38671
- Description: This Orchestral Suite was inspired by the art illustrations fromBrian Froud’s book ‘Good Faeries Bad Faeries’, where each piece in the suite represents a drawing from his book, portraying three good faeries and three bad and is in many ways a tone poem. Each piece calls for different orchestration to create individual colour to make each piece unique. Permission was not consented to include the drawings. The line-up is as follows: I. Waters of Wisdom – Overture to the faerie realm (good) II. The Thoughts of the Melancholic Faerie – She contemplates of past and present (bad) III. A Banshee Passing – the idea of death as coming unknowingly and going quietly (bad) IV. Introduction to Faerie Lilu – clearing the mist V. The Faerie Lilu – the provocateur of restlessness – she inspires wild dreams, lost fantasies and gives artists their sparks of genius (bad) VI. A Cluster of Hedgerow Pixies – They are very mischievous – in a (good) way. VII. The Dance of the Oboe Faerie – a Finale (good). While he dances, he also sings of the faerie realm. A number of composers inspired me to pursue such a work, and firstly G. Holst has left his mark on me. The first and sixth movement was inspired by the ‘Planets’. The fifth movement is actually in homage to the French composer Frank Martin with the composition ‘Petite symphonie’ where he displays the piano and harpsichord – as I have done. The second and third movements are attempts to portray film music, such as composers H. Zimmerman and D.Elfman. The last movement has many neo-classical elements displayed and I. Stravinsky had a notable influence on this piece. All the composers mentioned here have contributed in more than one piece at some point in time. The theme of the work, the magical theme, always makes me reminisce my childhood where I would in amazement wonder about my grandmothers glorious garden in search of all that is magical, and composing this took me back to that time of innocent, child-like wonder
- Full Text:
- Date Issued: 2018
Portfolio of original compositions
- Authors: Nabal, Ruhan
- Date: 2018
- Subjects: Composition (Music) Music -- South Africa Suites (Orchestra , Piano music Marimba music
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: http://hdl.handle.net/10948/23858 , vital:30630
- Description: This Orchestral Suite was inspired by the art illustrations from Brian Froud’s book ‘Good Faeries Bad Faeries’, where each piece in the suite represents a drawing from his book, portraying three good faeries and three bad and is in many ways a tone poem. Each pieces calls for different orchestration to create individual colour to make each piece unique. Permission was not consented to include the drawings. The line-up is as follows:I. Waters of Wisdom – Overture to the faerie realm (good)II. The Thoughts of the Melancholic Faerie – She contemplates ofpast and present (bad)III. A Banshee Passing – the idea of death as coming unknowingly and going quietly (bad)IV. Introduction to Faerie Lilu – clearing the mist V. The Faerie Lilu – the provocateur of restlessness – she inspires wild dreams, lost fantasies and gives artists their sparks of genius (bad) VI. A Cluster of Hedgerow Pixies – They are very mischievous – in a (good) way.VII. The Dance of the Oboe Faerie – a Finale (good). While he dances, he also sings of the faerie realm.A number of composers inspired me to pursue such a work, and firstly G. Holst has left his mark on me. The first and sixth movement was inspired by the ‘Planets’. The fifth movement is actually in homage to the French composer Frank Martin with the composition ‘Petite symphonie’ where he displays the piano and harpsichord – as I have done. The second and third movements are attempts to portray film music, such as composers H. Zimmerman and D.Elfman. The last movement has many neo-classical elements displayed and I. Stravinsky had a notable influence on this piece. All the composers mentioned here have contributed in more than one piece at some point in time.The theme of the work, the magical theme, always makes me reminisce my childhood where I would in amazement wonder about my grandmothers glorious garden in search of all that is magical, and composing this took me back to that time of innocent, child-like wonder.
- Full Text:
- Date Issued: 2018
- Authors: Nabal, Ruhan
- Date: 2018
- Subjects: Composition (Music) Music -- South Africa Suites (Orchestra , Piano music Marimba music
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: http://hdl.handle.net/10948/23858 , vital:30630
- Description: This Orchestral Suite was inspired by the art illustrations from Brian Froud’s book ‘Good Faeries Bad Faeries’, where each piece in the suite represents a drawing from his book, portraying three good faeries and three bad and is in many ways a tone poem. Each pieces calls for different orchestration to create individual colour to make each piece unique. Permission was not consented to include the drawings. The line-up is as follows:I. Waters of Wisdom – Overture to the faerie realm (good)II. The Thoughts of the Melancholic Faerie – She contemplates ofpast and present (bad)III. A Banshee Passing – the idea of death as coming unknowingly and going quietly (bad)IV. Introduction to Faerie Lilu – clearing the mist V. The Faerie Lilu – the provocateur of restlessness – she inspires wild dreams, lost fantasies and gives artists their sparks of genius (bad) VI. A Cluster of Hedgerow Pixies – They are very mischievous – in a (good) way.VII. The Dance of the Oboe Faerie – a Finale (good). While he dances, he also sings of the faerie realm.A number of composers inspired me to pursue such a work, and firstly G. Holst has left his mark on me. The first and sixth movement was inspired by the ‘Planets’. The fifth movement is actually in homage to the French composer Frank Martin with the composition ‘Petite symphonie’ where he displays the piano and harpsichord – as I have done. The second and third movements are attempts to portray film music, such as composers H. Zimmerman and D.Elfman. The last movement has many neo-classical elements displayed and I. Stravinsky had a notable influence on this piece. All the composers mentioned here have contributed in more than one piece at some point in time.The theme of the work, the magical theme, always makes me reminisce my childhood where I would in amazement wonder about my grandmothers glorious garden in search of all that is magical, and composing this took me back to that time of innocent, child-like wonder.
- Full Text:
- Date Issued: 2018
Possible future jobs in the republic of South Africa by 2030
- Authors: Kasvosve, Johanis
- Date: 2018
- Subjects: Industries -- Technological innovations , Labor market -- South Africa Employment (Economic theory)
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/30660 , vital:31008
- Description: The 21st century has experienced dramatic, fundamental and unprecedented changes that have seen many organisations having to reconsider their competitive strategies in order to remain relevant in the market place. Within the context of South Africa, these changes have resulted in the disappearance, dwindling or expansion of some jobs. The dawn of the 21st century marked the beginning of the Fourth Industrial Revolutions (Industry 4.0). Although Industry 4.0 can bring about great promises for the future, the patterns of consumption, production and employment created by it also pose substantive challenges in the form of technological unemployment requiring proactive adaptation by businesses, governments and individuals. This study aimed at identifying possible future jobs in the Republic of South Africa as we transition to 2030. Causal Layered Analysis (CLA) and Environmental Scanning were identified as the preferred methodologies to be utilised to respond to the research objectives of this study. A detailed literature study was undertaken to evaluate the existing body of knowledge on the research topic. The literature study revealed that technological advancements, economic, urbanisation, globalisation, economic, political, demographic and environmental factors are the major determinants of future jobs. Chapter 4 dealt with the application of the CLA. This research ought to be understood in the context that utility of CLA is not in predicting the future of jobs but in creating transformative spaces for the creation of alternative futures that are desirable for the country as we transition to 2030. Some of the key findings emanating for this study are that Industry 4.0 is poised to render routine manufacturing jobs redundant. Furthermore, the advancements in technology are posed to result in massive employment opportunities for developers of web tolls, applications, hardware design and engineers and those working in web-based businesses. More jobs are likely to emanate from greening the economy. Progressive emancipation of women is likely to result in occupations and working x arrangements that facilitate a successful compromise between work life and private lives resulting in social care jobs. A number of strategic considerations and recommendations were also sponsored with a view to respond to the trends shaping the future of jobs in South Africa.
- Full Text:
- Date Issued: 2018
- Authors: Kasvosve, Johanis
- Date: 2018
- Subjects: Industries -- Technological innovations , Labor market -- South Africa Employment (Economic theory)
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/30660 , vital:31008
- Description: The 21st century has experienced dramatic, fundamental and unprecedented changes that have seen many organisations having to reconsider their competitive strategies in order to remain relevant in the market place. Within the context of South Africa, these changes have resulted in the disappearance, dwindling or expansion of some jobs. The dawn of the 21st century marked the beginning of the Fourth Industrial Revolutions (Industry 4.0). Although Industry 4.0 can bring about great promises for the future, the patterns of consumption, production and employment created by it also pose substantive challenges in the form of technological unemployment requiring proactive adaptation by businesses, governments and individuals. This study aimed at identifying possible future jobs in the Republic of South Africa as we transition to 2030. Causal Layered Analysis (CLA) and Environmental Scanning were identified as the preferred methodologies to be utilised to respond to the research objectives of this study. A detailed literature study was undertaken to evaluate the existing body of knowledge on the research topic. The literature study revealed that technological advancements, economic, urbanisation, globalisation, economic, political, demographic and environmental factors are the major determinants of future jobs. Chapter 4 dealt with the application of the CLA. This research ought to be understood in the context that utility of CLA is not in predicting the future of jobs but in creating transformative spaces for the creation of alternative futures that are desirable for the country as we transition to 2030. Some of the key findings emanating for this study are that Industry 4.0 is poised to render routine manufacturing jobs redundant. Furthermore, the advancements in technology are posed to result in massive employment opportunities for developers of web tolls, applications, hardware design and engineers and those working in web-based businesses. More jobs are likely to emanate from greening the economy. Progressive emancipation of women is likely to result in occupations and working x arrangements that facilitate a successful compromise between work life and private lives resulting in social care jobs. A number of strategic considerations and recommendations were also sponsored with a view to respond to the trends shaping the future of jobs in South Africa.
- Full Text:
- Date Issued: 2018
Possible futures for agricultural financing in sub-Saharan Africa towards 2055
- Authors: Oberholster, Jacobus Hoon
- Date: 2018
- Subjects: Agriculture -- Africa, Sub-Saharan -- Finance , Agricultural industries -- Africa, Sub-Saharan , Agricultural productivity -- Africa, Sub-Saharan
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/23069 , vital:30403
- Description: The research developed four possible future scenarios for agricultural financing in Sub-Saharan Africa towards 2055, namely the “Rising Sun”, “Two Wolves”, “The Left Wing and the Right Wing”, and the “Two Moons” scenarios. The scenarios aim to stimulate new thoughts on an inclusive and broader development approach to agricultural financing, and to identify gaps in the knowledge about a broad range of research issues relating to the level of complexity with regard to the decision-making environment in agricultural financing. The scenarios are developed, according to a strict and predetermined process, which is guided by the Six-Pillars approach of futures studies. A conceptual futures study model for agricultural financing was also developed to guide and clarify the way in which the research on agricultural financing can be integrated into the body of existing futures study theory. The research begins with a comprehensive environmental scan, from which various trends and driving forces emerged. The causal-layered analysis (CLA) method is then used in tandem with other futures-study techniques, such as the futures triangle and emerging issues analyses, to guide the process of knowledge creation about the future of agricultural financing. A real-time Delphi study was also conducted to validate and prioritise the megatrends and driving forces that emerged from the research. Subsequently, the research presents four future scenarios that aim to provide a better understanding of the future of agricultural financing in Sub-Saharan Africa over next 40 years. The research presents agriculture as a multi-dimensional sector that fulfils different roles and functions in especially rural communities in Sub-Saharan Africa, which contribute to the perceived riskiness of agricultural financing. The scenarios illustrate how conditions for agricultural development and agricultural financing can develop and change in the region towards 2055. Furthermore, it provides useful insight into the drivers for change and how to anticipate these changes. The Delphibased scenario research also allowed the aggregation of expert knowledge, which can be used to inform decision-makers in the financial-service sector to test the robustness and appropriateness of existing business models and strategies. The scenarios can also be used as a starting point for financial-service providers and other key stakeholders to identify the future challenges and to maximise the emerging business and development opportunities, as offered by the agricultural sector in Sub-Saharan Africa. The research closes a research gap with regard to scenario development in agricultural financing in Sub-Saharan Africa within the context of the globaldevelopment agenda. The research looks at the future of agricultural financing in Sub-Saharan Africa over the next 40 years from a decision-maker’s point of view; and it provides key insights into especially the rural agricultural financial challenge in the region. A cornerstone of the research is to align policy initiatives and the business strategies of financial service providers with the vision of a broadened view of rural finance and increased financial inclusion in agriculture. The scenarios offer a starting point to develop new and more inclusive agricultural financing strategies that have the ability to speed up income convergence and economic diversification, especially with regard to rural economies in Sub-Saharan Africa that are heavily dependent on agriculture and its related industries. The research also makes a meaningful contribution by introducing a forward-looking, systems-thinking approach to agricultural financing, which is necessary to evaluate the sector’s financing needs within the context of modern food systems that are increasingly being characterised by increased levels of chain co-ordination and value creation. Subsequently, disruptive digital technologies and innovations in agricultural value-chain financing emerged as the most significant driving forces for agricultural financing in Sub-Saharan Africa towards 2055.
- Full Text:
- Date Issued: 2018
- Authors: Oberholster, Jacobus Hoon
- Date: 2018
- Subjects: Agriculture -- Africa, Sub-Saharan -- Finance , Agricultural industries -- Africa, Sub-Saharan , Agricultural productivity -- Africa, Sub-Saharan
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/23069 , vital:30403
- Description: The research developed four possible future scenarios for agricultural financing in Sub-Saharan Africa towards 2055, namely the “Rising Sun”, “Two Wolves”, “The Left Wing and the Right Wing”, and the “Two Moons” scenarios. The scenarios aim to stimulate new thoughts on an inclusive and broader development approach to agricultural financing, and to identify gaps in the knowledge about a broad range of research issues relating to the level of complexity with regard to the decision-making environment in agricultural financing. The scenarios are developed, according to a strict and predetermined process, which is guided by the Six-Pillars approach of futures studies. A conceptual futures study model for agricultural financing was also developed to guide and clarify the way in which the research on agricultural financing can be integrated into the body of existing futures study theory. The research begins with a comprehensive environmental scan, from which various trends and driving forces emerged. The causal-layered analysis (CLA) method is then used in tandem with other futures-study techniques, such as the futures triangle and emerging issues analyses, to guide the process of knowledge creation about the future of agricultural financing. A real-time Delphi study was also conducted to validate and prioritise the megatrends and driving forces that emerged from the research. Subsequently, the research presents four future scenarios that aim to provide a better understanding of the future of agricultural financing in Sub-Saharan Africa over next 40 years. The research presents agriculture as a multi-dimensional sector that fulfils different roles and functions in especially rural communities in Sub-Saharan Africa, which contribute to the perceived riskiness of agricultural financing. The scenarios illustrate how conditions for agricultural development and agricultural financing can develop and change in the region towards 2055. Furthermore, it provides useful insight into the drivers for change and how to anticipate these changes. The Delphibased scenario research also allowed the aggregation of expert knowledge, which can be used to inform decision-makers in the financial-service sector to test the robustness and appropriateness of existing business models and strategies. The scenarios can also be used as a starting point for financial-service providers and other key stakeholders to identify the future challenges and to maximise the emerging business and development opportunities, as offered by the agricultural sector in Sub-Saharan Africa. The research closes a research gap with regard to scenario development in agricultural financing in Sub-Saharan Africa within the context of the globaldevelopment agenda. The research looks at the future of agricultural financing in Sub-Saharan Africa over the next 40 years from a decision-maker’s point of view; and it provides key insights into especially the rural agricultural financial challenge in the region. A cornerstone of the research is to align policy initiatives and the business strategies of financial service providers with the vision of a broadened view of rural finance and increased financial inclusion in agriculture. The scenarios offer a starting point to develop new and more inclusive agricultural financing strategies that have the ability to speed up income convergence and economic diversification, especially with regard to rural economies in Sub-Saharan Africa that are heavily dependent on agriculture and its related industries. The research also makes a meaningful contribution by introducing a forward-looking, systems-thinking approach to agricultural financing, which is necessary to evaluate the sector’s financing needs within the context of modern food systems that are increasingly being characterised by increased levels of chain co-ordination and value creation. Subsequently, disruptive digital technologies and innovations in agricultural value-chain financing emerged as the most significant driving forces for agricultural financing in Sub-Saharan Africa towards 2055.
- Full Text:
- Date Issued: 2018
Possible futures for transport in South Africa towards 2035
- Authors: Mnqeta, Qawekazi Wanda
- Date: 2018
- Subjects: Transportation -- South Africa , Transportation and state -- South Africa Urban transportation -- South Africa Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22746 , vital:30071
- Description: It is evident that there is a great dissatisfaction with the current model of transport as the level of accidents continue to rise. The containment on carbon emission levels are illusive and transport congestion is becoming impossible to handle. The number of cars in cities is increasing rapidly, resulting in increased traffic congestion, less mobility, poor air quality and more road accidents. In the National Development Plan (NDP), one of the challenges identified is that despite a slowdown in the growth within urban areas, 14 million people are projected to move to South African cities between 2010 and 2050 (UN-Habitat, 2014).This will exert pressure on service delivery by municipalities – including transport and transport infrastructure. A large proportion of these new urban residents will be poor, further enhancing the pressure. Transportation networks or systems are therefore key to the spatial transformation of South Africa’s urban areas. Although there has been significant progress in some cities in delivering new public transport infrastructure, the major shift from supporting private cars to incentivising public transport is yet to happen. The NDP vision for urban South Africa is that by 2030, South Africa should observe meaningful and measurable progress in reviving rural areas and in creating more functionally integrated, balanced and vibrant urban settlements. For this to happen, it is said that the country must clarify and relentlessly pursue a national vision for spatial development, sharpen the instruments for achieving this vision and build the required capabilities in the state and among citizens (The Presidency of South Africa, 2011). The outcomes of this analysis of future studies theory and practice supported the argument presented at the beginning of this research that there is robust requirement for a fundamental shift in the ways and methods of planning the future of South Africa’s transport industry towards 2035.
- Full Text:
- Date Issued: 2018
- Authors: Mnqeta, Qawekazi Wanda
- Date: 2018
- Subjects: Transportation -- South Africa , Transportation and state -- South Africa Urban transportation -- South Africa Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22746 , vital:30071
- Description: It is evident that there is a great dissatisfaction with the current model of transport as the level of accidents continue to rise. The containment on carbon emission levels are illusive and transport congestion is becoming impossible to handle. The number of cars in cities is increasing rapidly, resulting in increased traffic congestion, less mobility, poor air quality and more road accidents. In the National Development Plan (NDP), one of the challenges identified is that despite a slowdown in the growth within urban areas, 14 million people are projected to move to South African cities between 2010 and 2050 (UN-Habitat, 2014).This will exert pressure on service delivery by municipalities – including transport and transport infrastructure. A large proportion of these new urban residents will be poor, further enhancing the pressure. Transportation networks or systems are therefore key to the spatial transformation of South Africa’s urban areas. Although there has been significant progress in some cities in delivering new public transport infrastructure, the major shift from supporting private cars to incentivising public transport is yet to happen. The NDP vision for urban South Africa is that by 2030, South Africa should observe meaningful and measurable progress in reviving rural areas and in creating more functionally integrated, balanced and vibrant urban settlements. For this to happen, it is said that the country must clarify and relentlessly pursue a national vision for spatial development, sharpen the instruments for achieving this vision and build the required capabilities in the state and among citizens (The Presidency of South Africa, 2011). The outcomes of this analysis of future studies theory and practice supported the argument presented at the beginning of this research that there is robust requirement for a fundamental shift in the ways and methods of planning the future of South Africa’s transport industry towards 2035.
- Full Text:
- Date Issued: 2018
Postgraduate writing groups as spaces of agency development
- Oluwole, David O, Achadu, A, Asfour, Fouad-Martin, Chakona, Gamuchirai, Mason, Paul, Mataruse, P, McKenna, Sioux
- Authors: Oluwole, David O , Achadu, A , Asfour, Fouad-Martin , Chakona, Gamuchirai , Mason, Paul , Mataruse, P , McKenna, Sioux
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187194 , vital:44578 , xlink:href="https://doi.org/10.20853/32-6-2963"
- Description: Academic writing is a peculiar phenomenon – it varies greatly from discipline to discipline and its requirements are rarely made overt. Taking on the writing practices of the academy has implications for identity and it is thus unsurprising that it is seen to be a risky endeavour. This article analyses the experiences of postgraduate scholars who have participated in writing groups that meet weekly to read each other’s work and provide supportive critique. Thirty-two people provided detailed, anonymous evaluations of their writing groups and these were studied using a discourse analysis. Three main findings are discussed here. Firstly, writing circles allowed for academic writing development to be engaged with as a social practice, where the disciplinary norms could be made more explicit through peer deliberation, and where they could also be challenged. Secondly, the lack of hierarchical power in the writing groups was key to making safe spaces for agency development, and also for providing positive peer pressure whereby participants were spurred on to work on their writing. Thirdly, the fact that the groups were interdisciplinary, within cognate disciplinary families, provided an interesting challenge in that the students had to consider what these non-specialist readers would or would not understand. This process assisted students in clarifying their writing. Participants’ evaluation of the writing groups revealed an overall sense that these contributed to postgraduate student wellbeing and were places of significant agential development.
- Full Text:
- Date Issued: 2018
- Authors: Oluwole, David O , Achadu, A , Asfour, Fouad-Martin , Chakona, Gamuchirai , Mason, Paul , Mataruse, P , McKenna, Sioux
- Date: 2018
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187194 , vital:44578 , xlink:href="https://doi.org/10.20853/32-6-2963"
- Description: Academic writing is a peculiar phenomenon – it varies greatly from discipline to discipline and its requirements are rarely made overt. Taking on the writing practices of the academy has implications for identity and it is thus unsurprising that it is seen to be a risky endeavour. This article analyses the experiences of postgraduate scholars who have participated in writing groups that meet weekly to read each other’s work and provide supportive critique. Thirty-two people provided detailed, anonymous evaluations of their writing groups and these were studied using a discourse analysis. Three main findings are discussed here. Firstly, writing circles allowed for academic writing development to be engaged with as a social practice, where the disciplinary norms could be made more explicit through peer deliberation, and where they could also be challenged. Secondly, the lack of hierarchical power in the writing groups was key to making safe spaces for agency development, and also for providing positive peer pressure whereby participants were spurred on to work on their writing. Thirdly, the fact that the groups were interdisciplinary, within cognate disciplinary families, provided an interesting challenge in that the students had to consider what these non-specialist readers would or would not understand. This process assisted students in clarifying their writing. Participants’ evaluation of the writing groups revealed an overall sense that these contributed to postgraduate student wellbeing and were places of significant agential development.
- Full Text:
- Date Issued: 2018
Postpartum depression as defence against criminal liability
- Crafford, Krisascha, David, Desiree
- Authors: Crafford, Krisascha , David, Desiree
- Date: 2018
- Subjects: Postpartum depression -- South Africa , Mothers -- Mental health -- South Africa Female offenders -- South Africa Feminist criminology
- Language: English
- Type: Thesis , Masters , LLM`
- Identifier: http://hdl.handle.net/10948/38648 , vital:34863
- Description: The dissertation addresses the phenomenon of postpartum depression (and especially its most severe form of postpartum psychosis) against the backdrop of the defense of pathological criminal incapacity (the defense of mental illness, also known as insanity defense) the submission is made that, in the instance where a mother with postpartum depression, and especially postpartum psychosis causes the death of her infant or child such an accused could raise the defense of mental illness. This is due to the impact of the affliction on her mental facilities caused by the condition she was suffering from at the time of causing the death of her infant or child, such condition could render her incapable of distinguishing between right and wrong to act in accordance with such appreciation. If she can prove this, she cannot be held criminally liable for her actions, due to the absence of the required means rea element.
- Full Text:
- Date Issued: 2018
- Authors: Crafford, Krisascha , David, Desiree
- Date: 2018
- Subjects: Postpartum depression -- South Africa , Mothers -- Mental health -- South Africa Female offenders -- South Africa Feminist criminology
- Language: English
- Type: Thesis , Masters , LLM`
- Identifier: http://hdl.handle.net/10948/38648 , vital:34863
- Description: The dissertation addresses the phenomenon of postpartum depression (and especially its most severe form of postpartum psychosis) against the backdrop of the defense of pathological criminal incapacity (the defense of mental illness, also known as insanity defense) the submission is made that, in the instance where a mother with postpartum depression, and especially postpartum psychosis causes the death of her infant or child such an accused could raise the defense of mental illness. This is due to the impact of the affliction on her mental facilities caused by the condition she was suffering from at the time of causing the death of her infant or child, such condition could render her incapable of distinguishing between right and wrong to act in accordance with such appreciation. If she can prove this, she cannot be held criminally liable for her actions, due to the absence of the required means rea element.
- Full Text:
- Date Issued: 2018
Potable water production from atmospheric vapour using an ejector evacuated solar powered refrigeration system
- Authors: Cawood, John Henry
- Date: 2018
- Subjects: Solar energy , Solar radiation
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/23481 , vital:30567
- Description: This research project explores the possibility of using solar radiation energy to produce safe liquid water through the condensation of atmospheric water vapour for human consumption, livestock watering and also for small scale high value crop irrigation. The research activities are comprised of a literature study, comparison of similar devices in use, a design and prototyping exercise, a measure of development work to enhance the performance of the prototype and testing in Al-Batinah province in the Sultanate of Oman, where the author is currently on a work assignment. This dissertation describes the research activities performed to answer the following question: ‘Is it possible to economically produce sufficient quantities of liquid water from atmospheric vapour using only heat energy from the sun?’ This question poses a further two questions which need to be answered in the literature study. These are: ‘What is an economical price for clean drinking water?’ and ‘What is a sufficient quantity of water?’ The purpose of producing liquid water from atmospheric water vapour is an attempt to develop the technology to harvest an alternative and almost inexhaustible water source. The reason for requiring a new source of water is due to the fact that the available fresh water resources of the world are diminishing due to pollution, extensive utilisation and salination. Several references indicate that the problem is compounding itself due the increasing demand on a diminishing resource, with deepening negative effects on agriculture1, health2, economy3, industry and lifestyle4. Many future scenarios depict clean water as a scarce and expensive commodity, unaffordable to many. The condensation of atmospheric vapour is not a new concept. The literature study explores historical attempts to achieve this, as well as detailing the shortcomings of contemporary vapour condensation units as the modern state of the art. This survey covers the spectrum from large versions deployed by military and remote area construction operations to produce water for all purposes, to small desktop electrical water producing machines. The focus of the research is on a more environmentally conscious process, attempting to use a simple ejector driven device with sunshine as the energy source and water as the refrigerant. A further environmental enhancement of the concept is that of designing the machine to last for an extremely long working life, thereby diluting the carbon footprint of manufacture over a great number of years. A portion of the research is devoted to the development of a basic model which takes into account the climatic and meteorological variables to accurately predict a water harvest. The development of the model is then used to optimise the process, narrow the variability of assumptions and assist with the design. The model also serves to predict the performance of the unit in other locations under different prevailing climatic conditions. A design specification and a prototype are produced and tested. Finally the design is scrutinised using value engineering principles to reduce cost, effort and environmental impact and also to reduce the overall cost to provide a more economically viable appliance. The prototype device used in this study will use a collector area of 1 square meter, roughly equivalent to 1000 Watts of solar power under ideal conditions.
- Full Text:
- Date Issued: 2018
- Authors: Cawood, John Henry
- Date: 2018
- Subjects: Solar energy , Solar radiation
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/23481 , vital:30567
- Description: This research project explores the possibility of using solar radiation energy to produce safe liquid water through the condensation of atmospheric water vapour for human consumption, livestock watering and also for small scale high value crop irrigation. The research activities are comprised of a literature study, comparison of similar devices in use, a design and prototyping exercise, a measure of development work to enhance the performance of the prototype and testing in Al-Batinah province in the Sultanate of Oman, where the author is currently on a work assignment. This dissertation describes the research activities performed to answer the following question: ‘Is it possible to economically produce sufficient quantities of liquid water from atmospheric vapour using only heat energy from the sun?’ This question poses a further two questions which need to be answered in the literature study. These are: ‘What is an economical price for clean drinking water?’ and ‘What is a sufficient quantity of water?’ The purpose of producing liquid water from atmospheric water vapour is an attempt to develop the technology to harvest an alternative and almost inexhaustible water source. The reason for requiring a new source of water is due to the fact that the available fresh water resources of the world are diminishing due to pollution, extensive utilisation and salination. Several references indicate that the problem is compounding itself due the increasing demand on a diminishing resource, with deepening negative effects on agriculture1, health2, economy3, industry and lifestyle4. Many future scenarios depict clean water as a scarce and expensive commodity, unaffordable to many. The condensation of atmospheric vapour is not a new concept. The literature study explores historical attempts to achieve this, as well as detailing the shortcomings of contemporary vapour condensation units as the modern state of the art. This survey covers the spectrum from large versions deployed by military and remote area construction operations to produce water for all purposes, to small desktop electrical water producing machines. The focus of the research is on a more environmentally conscious process, attempting to use a simple ejector driven device with sunshine as the energy source and water as the refrigerant. A further environmental enhancement of the concept is that of designing the machine to last for an extremely long working life, thereby diluting the carbon footprint of manufacture over a great number of years. A portion of the research is devoted to the development of a basic model which takes into account the climatic and meteorological variables to accurately predict a water harvest. The development of the model is then used to optimise the process, narrow the variability of assumptions and assist with the design. The model also serves to predict the performance of the unit in other locations under different prevailing climatic conditions. A design specification and a prototype are produced and tested. Finally the design is scrutinised using value engineering principles to reduce cost, effort and environmental impact and also to reduce the overall cost to provide a more economically viable appliance. The prototype device used in this study will use a collector area of 1 square meter, roughly equivalent to 1000 Watts of solar power under ideal conditions.
- Full Text:
- Date Issued: 2018
Potential eco-physiological and phytosociological impacts of fracking on the vegetation of the Karoo, Eastern Cape, South Africa
- Authors: Martin, Kristen
- Date: 2018
- Subjects: Hydraulic fracturing -- Environmental aspects -- South Africa -- Eastern Cape , Germination Plant ecology Plant communities
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/31852 , vital:31853
- Description: Hydraulic fracturing or fracking is a technique that is used to extract gas from low permeable rocks. Large volumes of fluids (typically water combined with chemicals and sand) are injected at high pressure into rock formations to fracture them, allowing the gas to be released. A number of criticisms have come to light regarding the potential environmental impacts of this process. One concern is that there will be contamination of groundwater due to the toxicity of the chemicals used in the fracking process. There have been limited studies on the effects of fracking fluid on vegetation and no studies on South African vegetation specifically. The effects of fracking chemicals on the germination success and photosynthetic efficiency of plants was investigated for species common in areas earmarked for possible future hydraulic fracturing in the Karoo, South Africa. Germination of seeds was unaffected by these fracking fluids at application concentration in most species, but dwarf shrub and grass seeds were found to be sensitive to contamination. A single application treatment of plants with fracking fluid resulted in mortality in 50% of the species with reduced photosynthetic efficiency and growth in some of the surviving species. Long term continual treatment with diluted fracking fluids had an even greater effect on mortality and photosynthetic efficiency than a single high dose. The major vegetation types of the proposed fracking footprint were surveyed and analyses of the species, communities and their physiognomy were used to predict the tolerance of the Karoo vegetation to degradation resulting from shale gas development. An understanding of the sensitivity of vegetation was obtained from impacts of livestock on the vegetation. The results indicated that Grassland communities are least tolerant to degradation, Albany Thicket communities more tolerant and Nama-Karoo communities most tolerant. Escarpment Thickets were shown to be Nama-Karoo rather than Albany Thicket elements, and should be grouped with the former when considering the impacts of fracking.
- Full Text:
- Date Issued: 2018
- Authors: Martin, Kristen
- Date: 2018
- Subjects: Hydraulic fracturing -- Environmental aspects -- South Africa -- Eastern Cape , Germination Plant ecology Plant communities
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/31852 , vital:31853
- Description: Hydraulic fracturing or fracking is a technique that is used to extract gas from low permeable rocks. Large volumes of fluids (typically water combined with chemicals and sand) are injected at high pressure into rock formations to fracture them, allowing the gas to be released. A number of criticisms have come to light regarding the potential environmental impacts of this process. One concern is that there will be contamination of groundwater due to the toxicity of the chemicals used in the fracking process. There have been limited studies on the effects of fracking fluid on vegetation and no studies on South African vegetation specifically. The effects of fracking chemicals on the germination success and photosynthetic efficiency of plants was investigated for species common in areas earmarked for possible future hydraulic fracturing in the Karoo, South Africa. Germination of seeds was unaffected by these fracking fluids at application concentration in most species, but dwarf shrub and grass seeds were found to be sensitive to contamination. A single application treatment of plants with fracking fluid resulted in mortality in 50% of the species with reduced photosynthetic efficiency and growth in some of the surviving species. Long term continual treatment with diluted fracking fluids had an even greater effect on mortality and photosynthetic efficiency than a single high dose. The major vegetation types of the proposed fracking footprint were surveyed and analyses of the species, communities and their physiognomy were used to predict the tolerance of the Karoo vegetation to degradation resulting from shale gas development. An understanding of the sensitivity of vegetation was obtained from impacts of livestock on the vegetation. The results indicated that Grassland communities are least tolerant to degradation, Albany Thicket communities more tolerant and Nama-Karoo communities most tolerant. Escarpment Thickets were shown to be Nama-Karoo rather than Albany Thicket elements, and should be grouped with the former when considering the impacts of fracking.
- Full Text:
- Date Issued: 2018
Potential impact and host range of Pereskiophaga brasiliensis Anderson (Curculionidae): a new candidate biological control agent for the control of Pereskia aculeata Miller (Cactaceae) in South Africa
- Authors: Mdodana, Lumka Anita
- Date: 2018
- Subjects: Curculionidae -- South Africa , Cactus -- South Africa , Biological pest control agents , Alien plants-- South Africa , Pereskiophaga brasiliensis Anderson (Curculionidae) , Pereskia aculeata Miller (Cactaceae)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62350 , vital:28157
- Description: Pereskia aculeata Miller (Cactaceae) is a damaging invasive alien plant in South Africa that has negative impacts to indigenous biodiversity and ecosystem functioning. Mechanical and chemical control are not effective against P. aculeata so biological control is considered the only viable option. Two biological control agents, the leaf-feeding beetle Phenrica guerini Bechyne (Chrysomelidae) and the stem-wilting bug Catorhintha schaffneri (Coreidae), have been released in South Africa thus far. Post-release evaluations have indicated that P. guerini will not reduce P. aculeata densities to acceptable levels alone, while C. schaffneri was released very recently, so it is too soon to determine how effective that agent will be. Even if C. schaffneri is extremely damaging, it is likely that further agents will be required to reduce the densities of P. aculeata to acceptable levels within a reasonable time-scale. Additional agents should target the woody stems of P. aculeata which are not impacted by the damage of either of the released agents. Pereskiophaga brasiliensis Anderson (Curculionidae) is a promising potential candidate agent that feeds on the thick woody stems of the plant in the larval stage. Climatic matching, genetic matching and field based host specificity observations all indicated that P. brasiliensis was a promising candidate. In this study, the impact of P. brasiliensis to the target weed, P. aculeata, was quantified under quarantine conditions to determine whether it was sufficiently damaging to warrant release. This was followed by host specificity testing to determine whether P. brasiliensis was suitably host specific for release in South Africa. Impact studies indicated that P. brasiliensis was damaging to P. aculeata at insect densities that would be expected in the field. Pereskiophaga brasiliensis reduced the number of leaves of P. aculeata to a greater extent than it reduced shoot lengths, but both plant parameters were significantly reduced due to the feeding damage from the insect. This suggests that the damage from P. brasiliensis may be compatible with that of C. schaffneri which reduces shoot length to a greater degree than the number of leaves. Pereskiophaga brasiliensis is therefore sufficiently damaging to warrant release, and although interaction studies with the other agents would be required, it is expected that it should complement other existing agents. Although P. brasiliensis is sufficiently damaging, at present the host specificity data indicates that it is not suitably specific for release in South Africa because oviposition and larval development to the adult stage was recorded on both indigenous and alien plant species within the families Cactaceae and Basellaceae. This non-target feeding was recorded during no-choice tests, which are very conservative, but significant non-target damage and development to the adult stage was recorded on an indigenous plant from a different family to the target weed. Further host specificity testing, including paired and multiple choice tests, are required to confirm the broad host range of P. brasiliensis. Other biological control agents that damage the woody stems of P. aculeata should be considered. The stem-borer, Acanthodoxus machacalis (Cerambycidae) is considered the most promising of the other candidate agents as it can be sourced from a climatically matched region where genetically suitable P. aculeata plants are found, it is sufficiently damaging to the woody stems of P. aculeata and there is no evidence that the species has a broad host range. Acanthodoxus machacalis should be sourced from Rio de Janeiro, Brazil, and imported into quarantine in South Africa for host specificity testing.
- Full Text:
- Date Issued: 2018
- Authors: Mdodana, Lumka Anita
- Date: 2018
- Subjects: Curculionidae -- South Africa , Cactus -- South Africa , Biological pest control agents , Alien plants-- South Africa , Pereskiophaga brasiliensis Anderson (Curculionidae) , Pereskia aculeata Miller (Cactaceae)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62350 , vital:28157
- Description: Pereskia aculeata Miller (Cactaceae) is a damaging invasive alien plant in South Africa that has negative impacts to indigenous biodiversity and ecosystem functioning. Mechanical and chemical control are not effective against P. aculeata so biological control is considered the only viable option. Two biological control agents, the leaf-feeding beetle Phenrica guerini Bechyne (Chrysomelidae) and the stem-wilting bug Catorhintha schaffneri (Coreidae), have been released in South Africa thus far. Post-release evaluations have indicated that P. guerini will not reduce P. aculeata densities to acceptable levels alone, while C. schaffneri was released very recently, so it is too soon to determine how effective that agent will be. Even if C. schaffneri is extremely damaging, it is likely that further agents will be required to reduce the densities of P. aculeata to acceptable levels within a reasonable time-scale. Additional agents should target the woody stems of P. aculeata which are not impacted by the damage of either of the released agents. Pereskiophaga brasiliensis Anderson (Curculionidae) is a promising potential candidate agent that feeds on the thick woody stems of the plant in the larval stage. Climatic matching, genetic matching and field based host specificity observations all indicated that P. brasiliensis was a promising candidate. In this study, the impact of P. brasiliensis to the target weed, P. aculeata, was quantified under quarantine conditions to determine whether it was sufficiently damaging to warrant release. This was followed by host specificity testing to determine whether P. brasiliensis was suitably host specific for release in South Africa. Impact studies indicated that P. brasiliensis was damaging to P. aculeata at insect densities that would be expected in the field. Pereskiophaga brasiliensis reduced the number of leaves of P. aculeata to a greater extent than it reduced shoot lengths, but both plant parameters were significantly reduced due to the feeding damage from the insect. This suggests that the damage from P. brasiliensis may be compatible with that of C. schaffneri which reduces shoot length to a greater degree than the number of leaves. Pereskiophaga brasiliensis is therefore sufficiently damaging to warrant release, and although interaction studies with the other agents would be required, it is expected that it should complement other existing agents. Although P. brasiliensis is sufficiently damaging, at present the host specificity data indicates that it is not suitably specific for release in South Africa because oviposition and larval development to the adult stage was recorded on both indigenous and alien plant species within the families Cactaceae and Basellaceae. This non-target feeding was recorded during no-choice tests, which are very conservative, but significant non-target damage and development to the adult stage was recorded on an indigenous plant from a different family to the target weed. Further host specificity testing, including paired and multiple choice tests, are required to confirm the broad host range of P. brasiliensis. Other biological control agents that damage the woody stems of P. aculeata should be considered. The stem-borer, Acanthodoxus machacalis (Cerambycidae) is considered the most promising of the other candidate agents as it can be sourced from a climatically matched region where genetically suitable P. aculeata plants are found, it is sufficiently damaging to the woody stems of P. aculeata and there is no evidence that the species has a broad host range. Acanthodoxus machacalis should be sourced from Rio de Janeiro, Brazil, and imported into quarantine in South Africa for host specificity testing.
- Full Text:
- Date Issued: 2018
Potential latitudinal variation in orodigestive tract cancers in Africa
- Adeola, H A, Adefuye, A O, Jimoh, S A
- Authors: Adeola, H A , Adefuye, A O , Jimoh, S A
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/5280 , vital:44428 , http://www.samj.org.za/index.php/samj/article/view/12259
- Description: Background. Previous studies have alluded to a causal relationship between pathological entities and geographical variations, but there is a paucity of studies from Africa discussing the effect of latitudinal variation on orodigestive cancers in this region. It seems plausible that the burden of orodigestive cancer would differ as a result of variations in diet, cultural habits, climate and environmental conditions down the length of Africa. Objectives. To analyse regional variations in prevalence, incidence and mortality data in the global cancer statistics database (GLOBOCAN 2012) curated by the World Health Organization and the International Agency for Research on Cancer. Basic descriptive statistical tools were used to depict regional variations in cancer morbidity and mortality. Methods. Data on 13 African countries between longitude 20⁰ and 30⁰ east and latitude 35⁰ north and 35⁰ south were examined for variation in age-standardised orodigestive cancer prevalence, incidence and mortality. Possible regional causes for orodigestive tract cancer development were investigated. Data on lip and oral cavity, oesophageal, gastric, colorectal, liver, gallbladder and pancreatic cancers in the 13 countries were compared. Results. Our empirical findings from this preliminary study support the notion that the incidence and prevalence of orodigestive cancers vary within Africa. This effect may be due to environmental, economic, political and possibly genetic factors. Conclusions. Considering the heterogeneity of the above factors across Africa, disbursement of funding for cancer research and therapy in Africa should be focused in terms of regional variations to make best use of the fiscal allocation by African governments, non-governmental organisations and international agencies.
- Full Text:
- Date Issued: 2018
- Authors: Adeola, H A , Adefuye, A O , Jimoh, S A
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/5280 , vital:44428 , http://www.samj.org.za/index.php/samj/article/view/12259
- Description: Background. Previous studies have alluded to a causal relationship between pathological entities and geographical variations, but there is a paucity of studies from Africa discussing the effect of latitudinal variation on orodigestive cancers in this region. It seems plausible that the burden of orodigestive cancer would differ as a result of variations in diet, cultural habits, climate and environmental conditions down the length of Africa. Objectives. To analyse regional variations in prevalence, incidence and mortality data in the global cancer statistics database (GLOBOCAN 2012) curated by the World Health Organization and the International Agency for Research on Cancer. Basic descriptive statistical tools were used to depict regional variations in cancer morbidity and mortality. Methods. Data on 13 African countries between longitude 20⁰ and 30⁰ east and latitude 35⁰ north and 35⁰ south were examined for variation in age-standardised orodigestive cancer prevalence, incidence and mortality. Possible regional causes for orodigestive tract cancer development were investigated. Data on lip and oral cavity, oesophageal, gastric, colorectal, liver, gallbladder and pancreatic cancers in the 13 countries were compared. Results. Our empirical findings from this preliminary study support the notion that the incidence and prevalence of orodigestive cancers vary within Africa. This effect may be due to environmental, economic, political and possibly genetic factors. Conclusions. Considering the heterogeneity of the above factors across Africa, disbursement of funding for cancer research and therapy in Africa should be focused in terms of regional variations to make best use of the fiscal allocation by African governments, non-governmental organisations and international agencies.
- Full Text:
- Date Issued: 2018