Towards a collection of cost-effective technologies in support of the NIST cybersecurity framework
- Shackleton, Bruce Michael Stuart
- Authors: Shackleton, Bruce Michael Stuart
- Date: 2018
- Subjects: National Institute of Standards and Technology (U.S.) , Computer security , Computer networks Security measures , Small business Information technology Cost effectiveness , Open source software
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62494 , vital:28199
- Description: The NIST Cybersecurity Framework (CSF) is a specific risk and cybersecurity framework. It provides guidance on controls that can be implemented to help improve an organisation’s cybersecurity risk posture. The CSF Functions consist of Identify, Protect, Detect, Respond, and Recover. Like most Information Technology (IT) frameworks, there are elements of people, processes, and technology. The same elements are required to successfully implement the NIST CSF. This research specifically focuses on the technology element. While there are many commercial technologies available for a small to medium sized business, the costs can be prohibitively expensive. Therefore, this research investigates cost-effective technologies and assesses their alignment to the NIST CSF. The assessment was made against the NIST CSF subcategories. Each subcategory was analysed to identify where a technology would likely be required. The framework provides a list of Informative References. These Informative References were used to create high- level technology categories, as well as identify the technical controls against which the technologies were measured. The technologies tested were either open source or proprietary. All open source technologies tested were free to use, or have a free community edition. Proprietary technologies would be free to use, or considered generally available to most organisations, such as components contained within Microsoft platforms. The results from the experimentation demonstrated that there are multiple cost-effective technologies that can support the NIST CSF. Once all technologies were tested, the NIST CSF was extended. Two new columns were added, namely high-level technology category, and tested technology. The columns were populated with output from the research. This extended framework begins an initial collection of cost-effective technologies in support of the NIST CSF.
- Full Text:
- Date Issued: 2018
- Authors: Shackleton, Bruce Michael Stuart
- Date: 2018
- Subjects: National Institute of Standards and Technology (U.S.) , Computer security , Computer networks Security measures , Small business Information technology Cost effectiveness , Open source software
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62494 , vital:28199
- Description: The NIST Cybersecurity Framework (CSF) is a specific risk and cybersecurity framework. It provides guidance on controls that can be implemented to help improve an organisation’s cybersecurity risk posture. The CSF Functions consist of Identify, Protect, Detect, Respond, and Recover. Like most Information Technology (IT) frameworks, there are elements of people, processes, and technology. The same elements are required to successfully implement the NIST CSF. This research specifically focuses on the technology element. While there are many commercial technologies available for a small to medium sized business, the costs can be prohibitively expensive. Therefore, this research investigates cost-effective technologies and assesses their alignment to the NIST CSF. The assessment was made against the NIST CSF subcategories. Each subcategory was analysed to identify where a technology would likely be required. The framework provides a list of Informative References. These Informative References were used to create high- level technology categories, as well as identify the technical controls against which the technologies were measured. The technologies tested were either open source or proprietary. All open source technologies tested were free to use, or have a free community edition. Proprietary technologies would be free to use, or considered generally available to most organisations, such as components contained within Microsoft platforms. The results from the experimentation demonstrated that there are multiple cost-effective technologies that can support the NIST CSF. Once all technologies were tested, the NIST CSF was extended. Two new columns were added, namely high-level technology category, and tested technology. The columns were populated with output from the research. This extended framework begins an initial collection of cost-effective technologies in support of the NIST CSF.
- Full Text:
- Date Issued: 2018
An analysis of foreign market entry strategy for Discovery Limited
- Authors: Terblanche, Gaynor
- Date: 2018
- Subjects: Export marketing , Foreign exchange International trade
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/35841 , vital:33852
- Description: The Discovery Limited is a key player in the South African Insurance Industry, which is well regulated. The Insurance Industry is of a world class standard and compares favourably with economies such as BRIC (Brazil, Russia, India and China) countries. The South African economy continues to show a decline with a negative growth in gross domestic product (GDP), for two consecutive quarters (last quarter of 2016 and first quarter of 2017). The current dampened expected growth rates, with a highly penetrated insurance market in South Africa, are strong incentives to look for growth beyond the borders of South Africa. This study, therefore, explores the potential impact on investor confidence, when Discovery Limited enters Foreign Markets. The research objectives, namely Industry-Based considerations, institution-based considerations, resource-based considerations and recommendations, were used to draw linkages between the Discovery Shared Value Insurance Model and the Business Model Framework. Internationalisation models were introduced, yet Peng’s Comprehensive Model of Foreign Market Entry in conjunction with Discovery Limited’s Shared-Value Insurance Model, provides a greater scope to assess the foreign market entries The study seeks to propose a strategy for when firms enter foreign markets and explores investor confidence when doing so. The findings of the study will be able to be generalised in the market amongst firms who seek to enter foreign markets and provides insight and recommendations to all stakeholders upon taking the move. In pursuing this study, a qualitative approach was conducted. A review of the literature making use of academic resource, annual financial reports of the company and country reports available in the public domain, were used. Interviews were conducted using semi-structured questions with the Partner Market Executives of Discovery to gain deeper insight and understanding. An invitation to interview six (6) participants, was distributed and only five (5) were interviewed. This constitutes a (5/6) 83.3% response rate. These Partner Market Executives were best positioned to answer questions related to Foreign Market Entry (Partner Markets) for Discovery Limited. The questions were informed by the literature. A Thematic Analysis was conducted on the data collected to identify core themes that strongly resonated with participants. The research findings are credible, and the subject of the research was correctly identified, from the view point of both the researchers and the participants. The participation was voluntary and record keeping of audio and transcriptions were done. Based on the key themes identified for each of the three foreign market entry considerations, the study concluded that: ‘Vitality becomes core to the solution’, ‘the intellectual property that sits behind the Shared Value Model’, ‘Can’t run away from regulatory approval’, ‘Timing to enter a market’, and ‘infrastructure to enter a foreign market’ are crucial considerations that an investor would like to see, and Discovery Limited must be mindful of this when targeting growth in its share price. Therefore, Discovery will have to consider advice on infrastructure development for Africa and they will have to set an unobstructed vision and timeline to expand into Africa. Discovery Limited, being a South African Company, is still challenged with a product that must be compatible with the rest of the African market. Entering into Africa might not be a priority now, but the lack of knowledge on what the product for the African market would look like, left room for future research.
- Full Text:
- Date Issued: 2018
- Authors: Terblanche, Gaynor
- Date: 2018
- Subjects: Export marketing , Foreign exchange International trade
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/35841 , vital:33852
- Description: The Discovery Limited is a key player in the South African Insurance Industry, which is well regulated. The Insurance Industry is of a world class standard and compares favourably with economies such as BRIC (Brazil, Russia, India and China) countries. The South African economy continues to show a decline with a negative growth in gross domestic product (GDP), for two consecutive quarters (last quarter of 2016 and first quarter of 2017). The current dampened expected growth rates, with a highly penetrated insurance market in South Africa, are strong incentives to look for growth beyond the borders of South Africa. This study, therefore, explores the potential impact on investor confidence, when Discovery Limited enters Foreign Markets. The research objectives, namely Industry-Based considerations, institution-based considerations, resource-based considerations and recommendations, were used to draw linkages between the Discovery Shared Value Insurance Model and the Business Model Framework. Internationalisation models were introduced, yet Peng’s Comprehensive Model of Foreign Market Entry in conjunction with Discovery Limited’s Shared-Value Insurance Model, provides a greater scope to assess the foreign market entries The study seeks to propose a strategy for when firms enter foreign markets and explores investor confidence when doing so. The findings of the study will be able to be generalised in the market amongst firms who seek to enter foreign markets and provides insight and recommendations to all stakeholders upon taking the move. In pursuing this study, a qualitative approach was conducted. A review of the literature making use of academic resource, annual financial reports of the company and country reports available in the public domain, were used. Interviews were conducted using semi-structured questions with the Partner Market Executives of Discovery to gain deeper insight and understanding. An invitation to interview six (6) participants, was distributed and only five (5) were interviewed. This constitutes a (5/6) 83.3% response rate. These Partner Market Executives were best positioned to answer questions related to Foreign Market Entry (Partner Markets) for Discovery Limited. The questions were informed by the literature. A Thematic Analysis was conducted on the data collected to identify core themes that strongly resonated with participants. The research findings are credible, and the subject of the research was correctly identified, from the view point of both the researchers and the participants. The participation was voluntary and record keeping of audio and transcriptions were done. Based on the key themes identified for each of the three foreign market entry considerations, the study concluded that: ‘Vitality becomes core to the solution’, ‘the intellectual property that sits behind the Shared Value Model’, ‘Can’t run away from regulatory approval’, ‘Timing to enter a market’, and ‘infrastructure to enter a foreign market’ are crucial considerations that an investor would like to see, and Discovery Limited must be mindful of this when targeting growth in its share price. Therefore, Discovery will have to consider advice on infrastructure development for Africa and they will have to set an unobstructed vision and timeline to expand into Africa. Discovery Limited, being a South African Company, is still challenged with a product that must be compatible with the rest of the African market. Entering into Africa might not be a priority now, but the lack of knowledge on what the product for the African market would look like, left room for future research.
- Full Text:
- Date Issued: 2018
Development and optimisation of a novel Plasmodium falciparum Hsp90-Hop interaction assay
- Authors: Wambua, Lynn
- Date: 2018
- Subjects: Plasmodium falciparum , Molecular chaperones , Heat shock proteins , Protein-protein interactions , Antimalarials
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62626 , vital:28216
- Description: Protein-protein interactions are involved in a range of disease processes and thus have become the focus of many drug discovery programs. Widespread drug resistance to all currently used antimalarial drugs drives the search for alternative drug targets with novel mechanisms of action that offer new therapeutic options. Molecular chaperones such as heat shock proteins facilitate protein folding, play a role in protein trafficking and prevent protein misfolding in cells under stress. Heat shock protein 90 (Hsp90) is a well-studied chaperone that has been the focus of cancer drug development with moderate success. In Plasmodium falciparum (P. falciparum), heat shock proteins are thought to play a vital role in parasite survival of the physiologically diverse habitats of the parasite lifecycle and because Hsp90 is prominently expressed in P. falciparum, the chaperone is considered a potentially ideal drug target. Hsp90 function in cells is regulated by interactions with co-chaperones, which includes Heat shock protein 70-Heat shock protein 90 organising protein (Hop). As opposed to directly inhibiting Hsp90 activity, targeting Hsp90 interaction with Hop has recently been suggested as an alternative method of Hsp90 inhibition that has not been explored in P. falciparum. The aim of this research project was to demonstrate PfHsp90 and PfHop robustly interact in vitro and to facilitate high-throughput screening of PfHsp90-PfHop inhibitors by developing and optimising a novel plate capture Hsp90-Hop interaction assay. To establish the assay, the respective domains of the proteins that mediate Hsp90-Hop interaction were used (Hsp90 C- terminal domain and Hop TPR2A domain). The human Hsp90 C-terminal domain and glutathione-S-transferase (GST) coding sequences were cloned into pET-28a(+) and murine and P. falciparum TPR2A sequences into pGEX-4T-1 plasmids to enable expression of histidine-tagged and GST fusion proteins, respectively, in Escherichia coli. The P. falciparum Hsp90 C-terminal domain sequence cloned into pET-28a(+) was supplied by GenScript. The constructs were transformed into T7 Express lysYcompetent E. coli cells and subsequent small- scale expression studies showed the recombinant proteins were expressed in a soluble form allowing for subsequent protein purification. Purification of the recombinant proteins was achieved using nickel-NTA and glutathione affinity chromatography for the His-tagged (Hsp90 C-terminal domains and GST) and GST fusion proteins (TPR2A domains), respectively. The purified proteins were used to establish and optimise mammalian and P. falciparum Hsp90- Hop interaction assays on nickel-coated plates by immobilising the His-tagged C-terminal domains on the plates and detecting the binding of the GST-TPR2A domains using a colorimetric GST enzyme assay. Z’-factor values above 0.5 were observed for both assays indicating good separation between the protein interaction signals and negative control background signals, although relatively high background signals were observed for the mammalian interaction due to non-specific binding of murine TPR2A to the plate. Designed human and P. falciparum TPR peptides were observed to be effective inhibitors of the mammalian and P. falciparum interactions, demonstrating the assay’s ability to respond to inhibitor compounds. Comparison of assay performance using GST assay kit reagents and lab- prepared reagents showed the assay was more efficient using lab-prepared reagents, however, lower GST signals were observed when comparing assay performance using a custom prepared Ni-NTA plate to a purchased Ni-NTA plate. The Hsp90-Hop interaction assays were also performed using an alternative assay format in which the GST-TPR2A fusion proteins were immobilised on glutathione-coated plates and binding of the His-tagged C-terminal domains detected with a nickel-horseradish peroxidase (HRP) conjugate and a colorimetric HRP substrate. The assay showed higher interaction signals for the P. falciparum proteins but comparatively low signals for the mammalian proteins. Z’-factor values for the assay were above 0.8 for both protein sets, suggesting this assay format is superior to the GST assay. However, further optimisation of this assay format is required. This study demonstrated direct binding of PfHsp90-PfHop in vitro and established a novel and robust PfHsp90-PfHop interaction assay format that can be used in future screening campaigns.
- Full Text:
- Date Issued: 2018
- Authors: Wambua, Lynn
- Date: 2018
- Subjects: Plasmodium falciparum , Molecular chaperones , Heat shock proteins , Protein-protein interactions , Antimalarials
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/62626 , vital:28216
- Description: Protein-protein interactions are involved in a range of disease processes and thus have become the focus of many drug discovery programs. Widespread drug resistance to all currently used antimalarial drugs drives the search for alternative drug targets with novel mechanisms of action that offer new therapeutic options. Molecular chaperones such as heat shock proteins facilitate protein folding, play a role in protein trafficking and prevent protein misfolding in cells under stress. Heat shock protein 90 (Hsp90) is a well-studied chaperone that has been the focus of cancer drug development with moderate success. In Plasmodium falciparum (P. falciparum), heat shock proteins are thought to play a vital role in parasite survival of the physiologically diverse habitats of the parasite lifecycle and because Hsp90 is prominently expressed in P. falciparum, the chaperone is considered a potentially ideal drug target. Hsp90 function in cells is regulated by interactions with co-chaperones, which includes Heat shock protein 70-Heat shock protein 90 organising protein (Hop). As opposed to directly inhibiting Hsp90 activity, targeting Hsp90 interaction with Hop has recently been suggested as an alternative method of Hsp90 inhibition that has not been explored in P. falciparum. The aim of this research project was to demonstrate PfHsp90 and PfHop robustly interact in vitro and to facilitate high-throughput screening of PfHsp90-PfHop inhibitors by developing and optimising a novel plate capture Hsp90-Hop interaction assay. To establish the assay, the respective domains of the proteins that mediate Hsp90-Hop interaction were used (Hsp90 C- terminal domain and Hop TPR2A domain). The human Hsp90 C-terminal domain and glutathione-S-transferase (GST) coding sequences were cloned into pET-28a(+) and murine and P. falciparum TPR2A sequences into pGEX-4T-1 plasmids to enable expression of histidine-tagged and GST fusion proteins, respectively, in Escherichia coli. The P. falciparum Hsp90 C-terminal domain sequence cloned into pET-28a(+) was supplied by GenScript. The constructs were transformed into T7 Express lysYcompetent E. coli cells and subsequent small- scale expression studies showed the recombinant proteins were expressed in a soluble form allowing for subsequent protein purification. Purification of the recombinant proteins was achieved using nickel-NTA and glutathione affinity chromatography for the His-tagged (Hsp90 C-terminal domains and GST) and GST fusion proteins (TPR2A domains), respectively. The purified proteins were used to establish and optimise mammalian and P. falciparum Hsp90- Hop interaction assays on nickel-coated plates by immobilising the His-tagged C-terminal domains on the plates and detecting the binding of the GST-TPR2A domains using a colorimetric GST enzyme assay. Z’-factor values above 0.5 were observed for both assays indicating good separation between the protein interaction signals and negative control background signals, although relatively high background signals were observed for the mammalian interaction due to non-specific binding of murine TPR2A to the plate. Designed human and P. falciparum TPR peptides were observed to be effective inhibitors of the mammalian and P. falciparum interactions, demonstrating the assay’s ability to respond to inhibitor compounds. Comparison of assay performance using GST assay kit reagents and lab- prepared reagents showed the assay was more efficient using lab-prepared reagents, however, lower GST signals were observed when comparing assay performance using a custom prepared Ni-NTA plate to a purchased Ni-NTA plate. The Hsp90-Hop interaction assays were also performed using an alternative assay format in which the GST-TPR2A fusion proteins were immobilised on glutathione-coated plates and binding of the His-tagged C-terminal domains detected with a nickel-horseradish peroxidase (HRP) conjugate and a colorimetric HRP substrate. The assay showed higher interaction signals for the P. falciparum proteins but comparatively low signals for the mammalian proteins. Z’-factor values for the assay were above 0.8 for both protein sets, suggesting this assay format is superior to the GST assay. However, further optimisation of this assay format is required. This study demonstrated direct binding of PfHsp90-PfHop in vitro and established a novel and robust PfHsp90-PfHop interaction assay format that can be used in future screening campaigns.
- Full Text:
- Date Issued: 2018
Evaluation and identification of microbial contaminants in polyherbal medicines used for the treatment of tuberculosis in Amathole District Municipality, Eastern Cape Province, South Africa
- Authors: Famewo, Elizabeth Bosede
- Date: 2018
- Subjects: Tuberculosis -- Treatment -- South Africa Mycobacterial diseases -- South Africa -- Eastern Cape Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9680 , vital:34818
- Description: Tuberculosis is caused by Mycobacterium tuberculosis. The emergence of drug-resistant strains of this organism has become a global public health problem. In the continuing search for effective treatment, polyherbal medicines offer a great hope in the development of alternative drugs for the treatment of tuberculosis. The use of herbal formulations for therapeutic purposes has significantly increased in the developed and developing countries because of their curative property, less toxicity and minimal side effects. However, there is little information on their safety and effectiveness in the literature. To address this, polyherbal medicines used for the treatment of tuberculosis in the Eastern Cape Province of South Africa were evaluated. Ethno-medicinal survey was conducted through semi-structured questionnaires coupled with informal conversations with the herbal sellers in five communities in the study area. Bacterial and fungal DNA was extracted from the polyherbal medicines purchased. A fragment of the bacterial 16S rRNA gene and internal transcribed spacer region of the fungal rRNA operon were amplified with universal primers 27F and 518R, and ITS1 and ITS4 respectively. Following standard procedures, the amplicons were finally run on Illumina’s MiSeq platform. Furthermore, the remedies were screened against Mycobacterium tuberculosis H37Rv using Middlebrook 7H9 media and MGIT BACTEC 960 system. Agar dilution method was used to determine the minimum inhibitory concentration (MIC) of the remedies against eight bacteria and three fungi isolates. The herbal preparations were assayed for their toxicity using hatchability success and larval mortality of Artemia salina Leach. Finally, their nutritive properties were analysed using an inductively coupled plasma optical emission spectrometer for mineral analysis while the vitamins were determined using standardized methods A total of nine polyherbal preparations were collected. The herbs used for the preparation of these remedies belong to 20 families. Apiaceae [5(25 percent)] was the most prominent plant family used, followed by Liliaceae [4(20 percent)], Strychnaceae [4(20 percent)], Rutaceae [4(20 percent)] and Hypoxidaceae [3(15 percent)]. The two most frequently used plants were Allium sativum L. (Liliaceae) and Strychnos decussata (Pappe) Gilg. (Strychnaceae). Rhizomes was the most common parts used, followed by the roots and barks. The herbal medicines were prepared mainly by infusion and decoction. The presences of pathogenic and non-pathogenic bacteria were identified in the polyherbal medicines. Generally, the most common bacteria identified from the samples were Bacillus sp., Enterobacter sp., Klebsiella sp., Rahnella sp., Paenibacillus sp., Clostridium sp. and Pantoea sp. The predominant mycoflora obtained belongs to different genera or species of fungi; these include Alternaria, Candida, Ramularia, Cladosporium, Penicillium, Aspergillus and Malassezia. The susceptibility testing revealed that all the remedies contain anti-tubercular activity against M. tuberculosis H37Rv at concentrations below 50 ug/ml. Seven of the polyherbal preparations showed activity at concentrations below 25 ug/ml. The MIC values exhibited inhibitory activity at 1.562 μg/ml. However, isoniazid showed more inhibitory activity against M. tuberculosis at 0.05 μg/ml when compared to the polyherbal remedies. The inhibitory activity of the polyherbal medicines based on the overall MIC revealed that Hogsback first site (HBfs) and Fort Beaufort (FB) remedies were the most active remedies against the bacterial isolates at the concentration of 2.5 mg/mL. Among the nine herbal formulations, only King Williams Town site A (KWTa) remedy showed activity against Aspergillus niger and Aspergillus fumigatus with the MIC valve of 2.5 mg/mL. While King Williams Town site C (KWTc) and Hogsback third site (HBts) had the highest activity at 1.25 mg/mL against Candida albicans, the remaining remedies were active at 2.5 mg/mL. The percentage hatchability of 44.42 percent, 42.96 percent and 39.70 percent were observed in A. salina cysts incubated with herbal preparations from KWTa, HBfs and HBts respectively. The hatching success of the cysts in these remedies was significantly higher than the positive control (nystatin) and the negative control (sea water) at p < 0.05. The mortality of A. salina nauplii incubated in Alice (AL), King Williams Town site B (KWTb) and KWTc remedies were significantly higher than when larvae were incubated in both controls. Based on Meyer’s index, the LD50 of each polyherbal medicine was between 2.9 and 4.0 mg/ml, the LD50 values greater than 1 mg/ml, an indication that they are not toxic. The polyherbal preparations were found to be rich in vitamins and mineral nutrients. Calcium was the highest macronutrient detected while the lowest nutrient was phosphorus. Iron was the highest micronutrient in the majority of the polyherbal preparations while the lowest value was recorded for copper. Vitamin C was absent in the herbal preparations while vitamin A and E were detected. This study provides significant ethno-medicinal information on polyherbal medicines used for the treatment of TB in the study area. The presence of the identified bacteria and fungi in the herbal formulations is a cause for concern. However, the ability of the remedies to possess activity against Mycobacterium tuberculosis and other pathogenic microorganisms associated with tuberculosis infection makes them potential sources of new antimycobacterial agents. Also, they are rich sources of mineral nutrients, and are as well non-toxic, thus, they are safe for consumption. In view of their anti-tubercular properties, this study has provided a better understanding of the reasons why TB-patients make use of these polyherbal formulations. Also, the study supports the folkloric use of polyherbal medicines in the treatment of tuberculosis in the Eastern Cape Province, South Africa.
- Full Text:
- Date Issued: 2018
- Authors: Famewo, Elizabeth Bosede
- Date: 2018
- Subjects: Tuberculosis -- Treatment -- South Africa Mycobacterial diseases -- South Africa -- Eastern Cape Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9680 , vital:34818
- Description: Tuberculosis is caused by Mycobacterium tuberculosis. The emergence of drug-resistant strains of this organism has become a global public health problem. In the continuing search for effective treatment, polyherbal medicines offer a great hope in the development of alternative drugs for the treatment of tuberculosis. The use of herbal formulations for therapeutic purposes has significantly increased in the developed and developing countries because of their curative property, less toxicity and minimal side effects. However, there is little information on their safety and effectiveness in the literature. To address this, polyherbal medicines used for the treatment of tuberculosis in the Eastern Cape Province of South Africa were evaluated. Ethno-medicinal survey was conducted through semi-structured questionnaires coupled with informal conversations with the herbal sellers in five communities in the study area. Bacterial and fungal DNA was extracted from the polyherbal medicines purchased. A fragment of the bacterial 16S rRNA gene and internal transcribed spacer region of the fungal rRNA operon were amplified with universal primers 27F and 518R, and ITS1 and ITS4 respectively. Following standard procedures, the amplicons were finally run on Illumina’s MiSeq platform. Furthermore, the remedies were screened against Mycobacterium tuberculosis H37Rv using Middlebrook 7H9 media and MGIT BACTEC 960 system. Agar dilution method was used to determine the minimum inhibitory concentration (MIC) of the remedies against eight bacteria and three fungi isolates. The herbal preparations were assayed for their toxicity using hatchability success and larval mortality of Artemia salina Leach. Finally, their nutritive properties were analysed using an inductively coupled plasma optical emission spectrometer for mineral analysis while the vitamins were determined using standardized methods A total of nine polyherbal preparations were collected. The herbs used for the preparation of these remedies belong to 20 families. Apiaceae [5(25 percent)] was the most prominent plant family used, followed by Liliaceae [4(20 percent)], Strychnaceae [4(20 percent)], Rutaceae [4(20 percent)] and Hypoxidaceae [3(15 percent)]. The two most frequently used plants were Allium sativum L. (Liliaceae) and Strychnos decussata (Pappe) Gilg. (Strychnaceae). Rhizomes was the most common parts used, followed by the roots and barks. The herbal medicines were prepared mainly by infusion and decoction. The presences of pathogenic and non-pathogenic bacteria were identified in the polyherbal medicines. Generally, the most common bacteria identified from the samples were Bacillus sp., Enterobacter sp., Klebsiella sp., Rahnella sp., Paenibacillus sp., Clostridium sp. and Pantoea sp. The predominant mycoflora obtained belongs to different genera or species of fungi; these include Alternaria, Candida, Ramularia, Cladosporium, Penicillium, Aspergillus and Malassezia. The susceptibility testing revealed that all the remedies contain anti-tubercular activity against M. tuberculosis H37Rv at concentrations below 50 ug/ml. Seven of the polyherbal preparations showed activity at concentrations below 25 ug/ml. The MIC values exhibited inhibitory activity at 1.562 μg/ml. However, isoniazid showed more inhibitory activity against M. tuberculosis at 0.05 μg/ml when compared to the polyherbal remedies. The inhibitory activity of the polyherbal medicines based on the overall MIC revealed that Hogsback first site (HBfs) and Fort Beaufort (FB) remedies were the most active remedies against the bacterial isolates at the concentration of 2.5 mg/mL. Among the nine herbal formulations, only King Williams Town site A (KWTa) remedy showed activity against Aspergillus niger and Aspergillus fumigatus with the MIC valve of 2.5 mg/mL. While King Williams Town site C (KWTc) and Hogsback third site (HBts) had the highest activity at 1.25 mg/mL against Candida albicans, the remaining remedies were active at 2.5 mg/mL. The percentage hatchability of 44.42 percent, 42.96 percent and 39.70 percent were observed in A. salina cysts incubated with herbal preparations from KWTa, HBfs and HBts respectively. The hatching success of the cysts in these remedies was significantly higher than the positive control (nystatin) and the negative control (sea water) at p < 0.05. The mortality of A. salina nauplii incubated in Alice (AL), King Williams Town site B (KWTb) and KWTc remedies were significantly higher than when larvae were incubated in both controls. Based on Meyer’s index, the LD50 of each polyherbal medicine was between 2.9 and 4.0 mg/ml, the LD50 values greater than 1 mg/ml, an indication that they are not toxic. The polyherbal preparations were found to be rich in vitamins and mineral nutrients. Calcium was the highest macronutrient detected while the lowest nutrient was phosphorus. Iron was the highest micronutrient in the majority of the polyherbal preparations while the lowest value was recorded for copper. Vitamin C was absent in the herbal preparations while vitamin A and E were detected. This study provides significant ethno-medicinal information on polyherbal medicines used for the treatment of TB in the study area. The presence of the identified bacteria and fungi in the herbal formulations is a cause for concern. However, the ability of the remedies to possess activity against Mycobacterium tuberculosis and other pathogenic microorganisms associated with tuberculosis infection makes them potential sources of new antimycobacterial agents. Also, they are rich sources of mineral nutrients, and are as well non-toxic, thus, they are safe for consumption. In view of their anti-tubercular properties, this study has provided a better understanding of the reasons why TB-patients make use of these polyherbal formulations. Also, the study supports the folkloric use of polyherbal medicines in the treatment of tuberculosis in the Eastern Cape Province, South Africa.
- Full Text:
- Date Issued: 2018
Investigating the viability and performance of a pilot scale Fly Ash/Lime Filter Tower (FLFT) for greywater treatment and the fate of Triclosan post treatment
- Authors: Nondlazi, Sinoyolo
- Date: 2018
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63704 , vital:28473
- Description: Expected release date-April 2020
- Full Text:
- Date Issued: 2018
- Authors: Nondlazi, Sinoyolo
- Date: 2018
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63704 , vital:28473
- Description: Expected release date-April 2020
- Full Text:
- Date Issued: 2018
Association between maternal health status and birth outcomes in the Nelson Mandela Bay Health District
- Authors: Hawkins, Althea Anita
- Date: 2018
- Subjects: Birth weight, Low -- Nelson Mandela Bay Municipality , Birth weight Premature infants
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: http://hdl.handle.net/10948/30039 , vital:30812
- Description: In 2011, the South African low birth weight rates varied between 9% and 15.5%, according to different sources. This means that about one out of every ten babies born alive weighed less than 2500g. Furthermore, six of South Africa’s nine provinces, including the Eastern Cape, reported low birth weight rates equal or higher than the national average. These figures raise serious concerns about the health status of infants, their chances of survival and their quality of life, particularly in provinces with a high incidence of low birth weight. Literature has linked the maternal health status to adverse birth outcomes. Statistics from the district office of the Nelson Mandela Bay Health District (NMBHD) indicates that for the fourth quarter of 2015, between 16.65 and 20.9% low birth weight infants were born. However, limited information is available regarding the causes and maternal health status of the mothers of the infants born with adverse birth outcomes in the Nelson Mandela Bay Health District (NMBHD). The objective of the research study is to investigate the associations between maternal health status and birth outcomes in order to identify the major drivers of adverse birth outcomes in NMBHD. The study used a quantitative research approach. In order to enhance the design, the researcher used an explorative, descriptive, cross-sectional, contextual and survey research design. The study was conducted at the regional hospital in Nelson Mandela Bay Health District (NMBHD) and Midwifery Obstetric Units (MOU). The participants were selected using a convenient and purposive sampling technique. A structured, self-administered questionnaire was used as the data collection tool. A statistician assisted with the data analysis. Descriptive and inferential statistics were used. The researcher ensured that ethical considerations were maintained throughout the study to protect the participants. Reliability and validity were also ensured throughout the study. The total sample of the study was 207 and the mean age of the participants was 26,9 years. Hypertension and HIV were the conditions most diagnosed prior to, and during, pregnancy. Most of the delivered infants were females. The findings of the study revealed a significant association between maternal diabetes, maternal hypertension and the infants’ birth weight. Additional findings iv revealed that independent of gestational age, mothers with hypertension are likely to deliver low birth weight (LBW) infants. Antenatal care is of the utmost importance during pregnancy and special attention should be given to the management of hypertension. The researcher developed recommendations for primary health care (PHC) nurses in antenatal clinics (ANC) to address the management of the major maternal drivers of LBW infants in order to decrease and prevent adverse birth outcomes.
- Full Text:
- Date Issued: 2018
- Authors: Hawkins, Althea Anita
- Date: 2018
- Subjects: Birth weight, Low -- Nelson Mandela Bay Municipality , Birth weight Premature infants
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: http://hdl.handle.net/10948/30039 , vital:30812
- Description: In 2011, the South African low birth weight rates varied between 9% and 15.5%, according to different sources. This means that about one out of every ten babies born alive weighed less than 2500g. Furthermore, six of South Africa’s nine provinces, including the Eastern Cape, reported low birth weight rates equal or higher than the national average. These figures raise serious concerns about the health status of infants, their chances of survival and their quality of life, particularly in provinces with a high incidence of low birth weight. Literature has linked the maternal health status to adverse birth outcomes. Statistics from the district office of the Nelson Mandela Bay Health District (NMBHD) indicates that for the fourth quarter of 2015, between 16.65 and 20.9% low birth weight infants were born. However, limited information is available regarding the causes and maternal health status of the mothers of the infants born with adverse birth outcomes in the Nelson Mandela Bay Health District (NMBHD). The objective of the research study is to investigate the associations between maternal health status and birth outcomes in order to identify the major drivers of adverse birth outcomes in NMBHD. The study used a quantitative research approach. In order to enhance the design, the researcher used an explorative, descriptive, cross-sectional, contextual and survey research design. The study was conducted at the regional hospital in Nelson Mandela Bay Health District (NMBHD) and Midwifery Obstetric Units (MOU). The participants were selected using a convenient and purposive sampling technique. A structured, self-administered questionnaire was used as the data collection tool. A statistician assisted with the data analysis. Descriptive and inferential statistics were used. The researcher ensured that ethical considerations were maintained throughout the study to protect the participants. Reliability and validity were also ensured throughout the study. The total sample of the study was 207 and the mean age of the participants was 26,9 years. Hypertension and HIV were the conditions most diagnosed prior to, and during, pregnancy. Most of the delivered infants were females. The findings of the study revealed a significant association between maternal diabetes, maternal hypertension and the infants’ birth weight. Additional findings iv revealed that independent of gestational age, mothers with hypertension are likely to deliver low birth weight (LBW) infants. Antenatal care is of the utmost importance during pregnancy and special attention should be given to the management of hypertension. The researcher developed recommendations for primary health care (PHC) nurses in antenatal clinics (ANC) to address the management of the major maternal drivers of LBW infants in order to decrease and prevent adverse birth outcomes.
- Full Text:
- Date Issued: 2018
The influence of the state IT agency’s current performance-based rewards on employee motivation
- Authors: Lucwaba, Pamela Xolewa
- Date: 2018
- Subjects: Employee motivation , Incentive awards Employees -- Rating of
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22574 , vital:30008
- Description: Organisational success originates from employees’ willingness to use their abilities and skills so that an organisation continues to achieve its strategic objectives and thus remains competitive. The organisation’s task is to encourage and nourish these motivated employee inputs by putting effective rewards in place (Markova and Ford, 2011, p. 813.). In view of this, the purpose of this study was to gain a deeper understanding of the State IT Agency’s official performance-based rewards and to establish whether these rewards enhance employee motivation. A descriptive survey research design was adopted. The study targeted all 86 employees occupying non-managerial positions (Job level A1 – D1) at the State IT Agency – Eastern Cape. The study thus included the entire population. A structured questionnaire was used to collect data. Collected data was analysed using SPSS (Statistical Package for Social Sciences) for descriptive and inferential statistics. The results of the study were presented in frequency tables, cross-tabulations, histogram and line charts. The study revealed that intrinsically motivated employees are also motivated by financial and non-financial rewards. The research also showed that a statistically significant relationship exists between the number of years in the current position and employee motivation. This study’s results further revealed low levels of employee motivation as well as job dissatisfaction amongst the employees, dissatisfaction with the rewards provided by the organisation and that the State IT Agency is not providing employees with motivational factors perceived by employees as motivational. The study thus concluded that when the State IT Agency rewards outstanding employee performance with a performance-based bonus and a salary increase such employees’ motivation levels should be enhanced. It was recommended that the State IT Agency should design a total rewards strategy for the purpose of maximising the impact of various rewards on employee motivation. The State IT Agency should also focus on eliminating factors leading to employee dissatisfaction before implementing the proposed total rewards strategy because dissatisfied employees cannot be motivated.
- Full Text:
- Date Issued: 2018
- Authors: Lucwaba, Pamela Xolewa
- Date: 2018
- Subjects: Employee motivation , Incentive awards Employees -- Rating of
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22574 , vital:30008
- Description: Organisational success originates from employees’ willingness to use their abilities and skills so that an organisation continues to achieve its strategic objectives and thus remains competitive. The organisation’s task is to encourage and nourish these motivated employee inputs by putting effective rewards in place (Markova and Ford, 2011, p. 813.). In view of this, the purpose of this study was to gain a deeper understanding of the State IT Agency’s official performance-based rewards and to establish whether these rewards enhance employee motivation. A descriptive survey research design was adopted. The study targeted all 86 employees occupying non-managerial positions (Job level A1 – D1) at the State IT Agency – Eastern Cape. The study thus included the entire population. A structured questionnaire was used to collect data. Collected data was analysed using SPSS (Statistical Package for Social Sciences) for descriptive and inferential statistics. The results of the study were presented in frequency tables, cross-tabulations, histogram and line charts. The study revealed that intrinsically motivated employees are also motivated by financial and non-financial rewards. The research also showed that a statistically significant relationship exists between the number of years in the current position and employee motivation. This study’s results further revealed low levels of employee motivation as well as job dissatisfaction amongst the employees, dissatisfaction with the rewards provided by the organisation and that the State IT Agency is not providing employees with motivational factors perceived by employees as motivational. The study thus concluded that when the State IT Agency rewards outstanding employee performance with a performance-based bonus and a salary increase such employees’ motivation levels should be enhanced. It was recommended that the State IT Agency should design a total rewards strategy for the purpose of maximising the impact of various rewards on employee motivation. The State IT Agency should also focus on eliminating factors leading to employee dissatisfaction before implementing the proposed total rewards strategy because dissatisfied employees cannot be motivated.
- Full Text:
- Date Issued: 2018
I won’t be long
- Mhlambi, Ntombi Kayise Millicent
- Authors: Mhlambi, Ntombi Kayise Millicent
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63603 , vital:28446
- Description: My thesis is a weave of short stories, flash fiction and vignettes of prose-poetry. It uses lyrical, scenic and explorative modes to explore the stories of women, past, present and future, from all walks of life. These women, young and old, struggle to find their way within a ‘world’ characterised as Salithambo (the pink castle) whose structures and survival preys on their bodies. The stories explore the themes of girlhood and maturation, violence (specifically against women), animality, scatology, time, gender roles and expectations, and their rejection. I draw inspiration, stylistically, from Irenosen Okojie’s depiction of beauty and terror in the same sentence; Selah Saterstrom’s fragmented plot and directorial stroke; Taban Lo Liyong & Amos Tutuola’s avant-gardism and amplification of language; Adania Shibli’s sensorial and spare prose, Lyudmila Petrushevskaya, Lily Hoang & Carol Oates’ normalized magic spell, Athena Villaverde & Espido Freire’s imaginative overload of childhood; Shelley Jackson & Chevisa Woods’ construction of body parts as bearing texts or as texts themselves.
- Full Text:
- Date Issued: 2018
- Authors: Mhlambi, Ntombi Kayise Millicent
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63603 , vital:28446
- Description: My thesis is a weave of short stories, flash fiction and vignettes of prose-poetry. It uses lyrical, scenic and explorative modes to explore the stories of women, past, present and future, from all walks of life. These women, young and old, struggle to find their way within a ‘world’ characterised as Salithambo (the pink castle) whose structures and survival preys on their bodies. The stories explore the themes of girlhood and maturation, violence (specifically against women), animality, scatology, time, gender roles and expectations, and their rejection. I draw inspiration, stylistically, from Irenosen Okojie’s depiction of beauty and terror in the same sentence; Selah Saterstrom’s fragmented plot and directorial stroke; Taban Lo Liyong & Amos Tutuola’s avant-gardism and amplification of language; Adania Shibli’s sensorial and spare prose, Lyudmila Petrushevskaya, Lily Hoang & Carol Oates’ normalized magic spell, Athena Villaverde & Espido Freire’s imaginative overload of childhood; Shelley Jackson & Chevisa Woods’ construction of body parts as bearing texts or as texts themselves.
- Full Text:
- Date Issued: 2018
Quantification of pre-competitive sleep/wake behaviour in a sample of South African cyclists
- Authors: Steenekamp, Travis
- Date: 2018
- Subjects: Sleep deprivation , Cyclists Health and hygiene South Africa , Sleep Physiological aspects , Performance , Performance anxiety
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59015 , vital:27408
- Description: The quantification of athlete pre-competitive sleep behaviour is of interest owing to the possibility that sleep loss may have a negative effect on health and performance. The purpose of this study was to monitor and quantify the sleep/wake patterns of South African cyclists prior to competitive races. A total of 336 cyclists, male and female and of differing competition levels, cycling in either the 2015 Tsogo Sun Amashova or the 2016 Telkom 94.7 Cycle Challenge completed an altered version of the Competitive Sports and Sleep Questionnaire. The questionnaire asked cyclists to report on precompetitive sleep over the past year. A subset of 92 cyclists also recorded a Core Consensus Sleep Diary for the three nights leading up to the races. The questionnaire showed that 67% of the cyclists reported worsened sleep at least once prior to competition within the past 12 months. The sleep diary found that the cyclists’ average sleep duration the night before the races was 6h19min (±1h38min), which was significantly less than two and three nights prior to the races. Sleep quality was also shown to deteriorate significantly the night before the races. The contributing factors leading to worsened pre-competitive sleep were the time the cyclists had to wake-up as well as perceived increases in sleep latency and awakenings after sleep onset. Anxiety was found to be the major cause of sleep disturbances. While females were found to be significantly more likely to report having experienced poorer sleep before competition in the past year, the sleep diary showed no difference in sleep the night before the races between the sexes. Females were significantly more likely to report instances of unpleasant dreams and waking up during the night. Again, the sleep diary data did not corroborate these findings. Females were also found to report significantly more accounts of nervousness or thoughts about competition as being the cause of sleep problems. There was no difference in sleep loss the night before competition when comparing competition-level groups. The only significant difference was that recreational cyclists were more likely to report sleeping in foreign environments as a cause of sleep disturbances. Despite a large percentage of cyclists experiencing pre-competitive sleep loss, over half (55%) perceived sleep loss to have no impact on their performance. Analysis of pre-sleep behaviour also revealed that the cyclists engaged in several practices that may have a negative effect on subsequent sleep. The vast majority of the cyclists (61%) indicated having no specific strategy to help them sleep the night before competition. Fifteen percent of cyclists reporting using media devices to help them fall asleep, a practice that has been shown to disrupt sleep. In conclusion, most cyclists, regardless of sex and level of competition experience precompetitive sleep loss attributed largely to anxiety but with the perception that this loss in sleep does not negatively impact their performance.
- Full Text:
- Date Issued: 2018
- Authors: Steenekamp, Travis
- Date: 2018
- Subjects: Sleep deprivation , Cyclists Health and hygiene South Africa , Sleep Physiological aspects , Performance , Performance anxiety
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59015 , vital:27408
- Description: The quantification of athlete pre-competitive sleep behaviour is of interest owing to the possibility that sleep loss may have a negative effect on health and performance. The purpose of this study was to monitor and quantify the sleep/wake patterns of South African cyclists prior to competitive races. A total of 336 cyclists, male and female and of differing competition levels, cycling in either the 2015 Tsogo Sun Amashova or the 2016 Telkom 94.7 Cycle Challenge completed an altered version of the Competitive Sports and Sleep Questionnaire. The questionnaire asked cyclists to report on precompetitive sleep over the past year. A subset of 92 cyclists also recorded a Core Consensus Sleep Diary for the three nights leading up to the races. The questionnaire showed that 67% of the cyclists reported worsened sleep at least once prior to competition within the past 12 months. The sleep diary found that the cyclists’ average sleep duration the night before the races was 6h19min (±1h38min), which was significantly less than two and three nights prior to the races. Sleep quality was also shown to deteriorate significantly the night before the races. The contributing factors leading to worsened pre-competitive sleep were the time the cyclists had to wake-up as well as perceived increases in sleep latency and awakenings after sleep onset. Anxiety was found to be the major cause of sleep disturbances. While females were found to be significantly more likely to report having experienced poorer sleep before competition in the past year, the sleep diary showed no difference in sleep the night before the races between the sexes. Females were significantly more likely to report instances of unpleasant dreams and waking up during the night. Again, the sleep diary data did not corroborate these findings. Females were also found to report significantly more accounts of nervousness or thoughts about competition as being the cause of sleep problems. There was no difference in sleep loss the night before competition when comparing competition-level groups. The only significant difference was that recreational cyclists were more likely to report sleeping in foreign environments as a cause of sleep disturbances. Despite a large percentage of cyclists experiencing pre-competitive sleep loss, over half (55%) perceived sleep loss to have no impact on their performance. Analysis of pre-sleep behaviour also revealed that the cyclists engaged in several practices that may have a negative effect on subsequent sleep. The vast majority of the cyclists (61%) indicated having no specific strategy to help them sleep the night before competition. Fifteen percent of cyclists reporting using media devices to help them fall asleep, a practice that has been shown to disrupt sleep. In conclusion, most cyclists, regardless of sex and level of competition experience precompetitive sleep loss attributed largely to anxiety but with the perception that this loss in sleep does not negatively impact their performance.
- Full Text:
- Date Issued: 2018
A psychosocial reading of novice clinical psychologists’ talk about whiteness
- Authors: Kennedy, Brink
- Date: 2018
- Subjects: Clinical psychology Practice South Africa , White people Race identity South Africa , White privilege (Social structure) South Africa , White people Race identity Psychological aspects , Intercultural communication , Psychoanalysis and racism South Africa , Mentalization Based Therapy
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/60212 , vital:27751
- Description: This research presents a case study report of interview encounters with two novice white South African clinical psychologists. A psychosocial research methodology is employed to examine the discursive strategies that participants engage in when speaking about whiteness in the context of their professional identity and practice, as well as to examine the ways in which these discursive strategies support or constrain ‘mentalizing’ in relation to raced experience. One case study highlights an individualistic discourse of ‘racial innocence’, which constructs the speaker as being free of racial enculturation and consciousness, eliding a broader social context. I argue that this discourse closes down mentalizing in relation to more difficult, intractable aspects of raced experience in clinical work, relating to differences in positionality as well as issues of inequality. I also propose that this discourse may be understood in terms of a ‘pretend’ mode of thought, where aspects of the wider social context and of race in particular are experienced as being unrelated to intimate personal experience. The other case study highlights a discourse of ‘uneasy whiteness’ that involves awareness of white positionality, and that is grounded in a constructionist sensibility. This positions the speaker as being inevitably implicated in white privilege and racism in ways that she may be ignorant of. I argue that the discourse facilitates a particular type of mentalizing that is sensitive to the interpellation of intimate personal experience with a wider social context that encompasses a range of discourses and practices. It closes down mentalizing, however, in so far as it allows a reified construction of whiteness. I find the concept of psychic equivalence, which equates external (concrete, factual) reality and internal (subjective, symbolic) reality, useful in terms of understanding this reification. Overall the research highlights the tension between constructionist and individualistic modes of thinking within clinical psychology research and practice in the South African context. At the level of methodology, it presents an example of how these modes may be integrated within research. At the level of content, it explores differences between constructionist and individualistic talk in relation to race and psychological practice.
- Full Text:
- Date Issued: 2018
- Authors: Kennedy, Brink
- Date: 2018
- Subjects: Clinical psychology Practice South Africa , White people Race identity South Africa , White privilege (Social structure) South Africa , White people Race identity Psychological aspects , Intercultural communication , Psychoanalysis and racism South Africa , Mentalization Based Therapy
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/60212 , vital:27751
- Description: This research presents a case study report of interview encounters with two novice white South African clinical psychologists. A psychosocial research methodology is employed to examine the discursive strategies that participants engage in when speaking about whiteness in the context of their professional identity and practice, as well as to examine the ways in which these discursive strategies support or constrain ‘mentalizing’ in relation to raced experience. One case study highlights an individualistic discourse of ‘racial innocence’, which constructs the speaker as being free of racial enculturation and consciousness, eliding a broader social context. I argue that this discourse closes down mentalizing in relation to more difficult, intractable aspects of raced experience in clinical work, relating to differences in positionality as well as issues of inequality. I also propose that this discourse may be understood in terms of a ‘pretend’ mode of thought, where aspects of the wider social context and of race in particular are experienced as being unrelated to intimate personal experience. The other case study highlights a discourse of ‘uneasy whiteness’ that involves awareness of white positionality, and that is grounded in a constructionist sensibility. This positions the speaker as being inevitably implicated in white privilege and racism in ways that she may be ignorant of. I argue that the discourse facilitates a particular type of mentalizing that is sensitive to the interpellation of intimate personal experience with a wider social context that encompasses a range of discourses and practices. It closes down mentalizing, however, in so far as it allows a reified construction of whiteness. I find the concept of psychic equivalence, which equates external (concrete, factual) reality and internal (subjective, symbolic) reality, useful in terms of understanding this reification. Overall the research highlights the tension between constructionist and individualistic modes of thinking within clinical psychology research and practice in the South African context. At the level of methodology, it presents an example of how these modes may be integrated within research. At the level of content, it explores differences between constructionist and individualistic talk in relation to race and psychological practice.
- Full Text:
- Date Issued: 2018
The English East India Company and the British Crown: c. 1795-1803, the first occupation at the Cape of Good Hope
- Authors: Jordan, Calvin
- Date: 2018
- Subjects: East India Company , East India Company -- Influence , Cape of Good Hope (Colony) , Cape of Good Hope (South Africa) -- History -- 1795-1872 , Cape of Good Hope (South Africa) -- Politics and government -- 1795-1872 , British -- South Africa -- History -- 19th century , Great Britain -- Colonies -- Commerce , Great Britain -- Colonies -- Administration -- History -- 19th century , Merchant marine -- Great Britain -- History
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63164 , vital:28369
- Description: My thesis aims to investigate the relationship between the English East India Company (EEIC) and the British colonial administration at the Cape of Good Hope during the first British occupation (1795 to 1803). Studies and literature that concern the EEIC have rarely gone beyond the surface, detailing the presence of the EEIC at the Cape, and neglecting the Company’s involvement in the administration thereof. My thesis draws on prior works but attempts to address both temporal and spatial gaps in this literature on the Atlantic and Indian Ocean, and the history of the EEIC. This study takes note of the seaborne related activity around the ports, bays and islands at the Cape – including the regulation of these spaces and issues related to securing British trade and colonial possessions more generally. I question the framing of the Cape primarily as a constituent of a national unit by locating the colony within a broader global and maritime context. A key interest is to determine the degree to which the EEIC influenced and participated in the British governance of the Cape, particularly by exploring the maritime dimensions of the relationship between the EEIC and colonial governance during this particular period. This involves understanding the embeddedness of the Cape in British (Crown and Company) networks and the constitution of a ‘British maritime zone’. This study uses archival sources drawn from the British colonial government records, Company records, and the private diaries and letters of Lady Anne Barnard that relate to the Cape. It is shown that a uniquely configured governance convention was constituted to secure the mutual commercial and imperial interests of both Crown and Company. By keeping the Cape secure, the British sought to keep their greater seaborne Empire secure. This study reveals that the EEIC was significantly involved in and influenced the way the British administration governed the Cape.
- Full Text:
- Date Issued: 2018
- Authors: Jordan, Calvin
- Date: 2018
- Subjects: East India Company , East India Company -- Influence , Cape of Good Hope (Colony) , Cape of Good Hope (South Africa) -- History -- 1795-1872 , Cape of Good Hope (South Africa) -- Politics and government -- 1795-1872 , British -- South Africa -- History -- 19th century , Great Britain -- Colonies -- Commerce , Great Britain -- Colonies -- Administration -- History -- 19th century , Merchant marine -- Great Britain -- History
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63164 , vital:28369
- Description: My thesis aims to investigate the relationship between the English East India Company (EEIC) and the British colonial administration at the Cape of Good Hope during the first British occupation (1795 to 1803). Studies and literature that concern the EEIC have rarely gone beyond the surface, detailing the presence of the EEIC at the Cape, and neglecting the Company’s involvement in the administration thereof. My thesis draws on prior works but attempts to address both temporal and spatial gaps in this literature on the Atlantic and Indian Ocean, and the history of the EEIC. This study takes note of the seaborne related activity around the ports, bays and islands at the Cape – including the regulation of these spaces and issues related to securing British trade and colonial possessions more generally. I question the framing of the Cape primarily as a constituent of a national unit by locating the colony within a broader global and maritime context. A key interest is to determine the degree to which the EEIC influenced and participated in the British governance of the Cape, particularly by exploring the maritime dimensions of the relationship between the EEIC and colonial governance during this particular period. This involves understanding the embeddedness of the Cape in British (Crown and Company) networks and the constitution of a ‘British maritime zone’. This study uses archival sources drawn from the British colonial government records, Company records, and the private diaries and letters of Lady Anne Barnard that relate to the Cape. It is shown that a uniquely configured governance convention was constituted to secure the mutual commercial and imperial interests of both Crown and Company. By keeping the Cape secure, the British sought to keep their greater seaborne Empire secure. This study reveals that the EEIC was significantly involved in and influenced the way the British administration governed the Cape.
- Full Text:
- Date Issued: 2018
Towards understanding the effect of size variation on the aggressive and feeding behaviours of juvenile dusky kob Argyrosomus japonicus (Pisces: Sciaenidae)
- Authors: Babane, Siviwe Elvis
- Date: 2018
- Subjects: Argyrosomus -- Feeding and feeds , Aquaculture , Fishes -- Cannibalism , Fishes -- Feeding and feeds
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59592 , vital:27629
- Description: Many studies have been conducted on the effect of size-grading in other fish species. However, there is a paucity of scientific information on the effects of size variation on cannibalism of juvenile dusky kob. Thus, a study focusing on the effect of size variation on juvenile dusky kob aggressive and feeding (browsing) behaviours was conducted. Three separate groups of hatchery-reared juvenile dusky kob of were obtained from Oceanwise (Pty) Ltd for use in a series of three experimental trials. In all trials, juvenile fish of the same age were size-graded and the COV-value was used to determine the size variation. The focal fish (largest fish) was exposed to groups of fish with different size variation for 30-min. behavioural observations before and after feeding in randomised trials. The first experimental trial (Chapter 2) quantified the effect of increasing size variation and observation time on the aggressive and browsing behaviours of juvenile dusky kob. On average, juvenile dusky kob weighed 3.60 ± 0.68 g fish-1 and measured 5.8 ± 0.41 mm. Each focal fish was observed (a) before feeding in the morning, (b) 2 h after feeding, (c) 6 h after feeding and (d) 12 h after feeding. Fish increased browsing behaviours (averaging 6.60 ± 0.56) and decreased intimidating aggressive behaviours (18.60 ± 1.39) 12 h after feeding. Other aggressive behaviours occurred but did not differ between observation times. Aggressive and browsing behaviours positively correlated with size variation variables, predominantly, 12 h after feeding. An average frequency of 19 chases were observed positively correlated with size variation, followed by average frequencies of 17 body bites and browses, and 11 tail bites per 30 min. Some behaviours including average frequencies of 0.2 chases, 4 tail bites, 2.4 intimidating and 0.3 browsing behaviours negatively correlated with the size variation, generally closer to the last meal. These preliminary observations thus showed that fish have become hungry approximately 6-12 h after feeding and substituted certain behaviours for others as time after feeding passed and as size variation increased. The second experimental trial (Chapter 3) consisted of the observations further testing the relationship between aggressive behaviours and size variation of juveniles of dusky kob averaging 0.43 ± 0.27 g fish-1. The focal fish was exposed to groups of fish of four size variation (COV) treatments for observations before and 12 h after feeding. Aggressive behaviours positively correlated with size variation both before and 12 h after feeding. An average frequency of 437 body bites positively correlated more often with COV, followed by average frequencies of 365 intimidating behaviours and 199 tail bites per 30 min., respectively, before and 12 h after feeding. The least often exhibited aggressive behaviours averaged 26 chases while positively correlating with size variation on the times specified. An average frequency of 311 intimidating behaviours before and after feeding including average of 28 tail bites after feeding negatively correlated with size variation. This may relate to shift of behaviours depending on the needs and capacity of the fish. Apparently, aggressive fish can change its behaviour as a function of COV-values rather than the mean size of the other fish. The third trial (Chapter 4) investigated the effect of the aggressor’s (focal fish) size in relation its aggressive and browsing behaviours to other fish (non-focal fish). Juvenile fish used for this trial, on average, weighed 30 ± 7.63 g fish-1. Aggressive and browsing behaviours were observed in four treatments of a) high COV and mean weight below, b) low COV and mean weight less, c) high COV and mean weight equivalent to and d) low COV and mean weight higher than that of the focal fish. Increased frequencies of aggressive and browsing behaviours per 30 min. occurred in treatment A, sharing similar frequencies in treatment C, compared to the other treatments (B and D) which shared certain frequencies. The intimidating behaviours predominated, followed by browsing, body bites, chases and tail bites, respectively. The results of the overall study suggest that the time passed after feeding and increasing size variation and differences facilitated aggressive and browsing behaviours in juvenile dusky kob. Dusky kob showed increasing aggressive behaviours as early as in the first two weeks after hatching, averaging 0.43 ± 0.27 g fish-1 with the frequency correlating with size differences. Consistent size-grading technique in the same-age fish should be used to manage size variation associated with aggressive behaviours. The period of about 4-6 h after feeding may explain the noticeable increased aggressive and browsing behaviours. Thus, fish should be fed immediately before or after evacuation of their guts to maintain less-aggressive behaviours of juvenile dusky kob. Fish generally increased aggressive and browsing acts before and long time after feeding than closer to after feeding. The study has provided the fundamental scientific groundwork for fish farmers and future researchers can further explore size variation, time after feeding and gut evacuation rate as critical components of aggressive behaviours. The scientific knowledge of aggressive and cannibalistic behaviours has essential application in farming management to achieve improved survival and growth rates in juvenile fish.
- Full Text:
- Date Issued: 2018
- Authors: Babane, Siviwe Elvis
- Date: 2018
- Subjects: Argyrosomus -- Feeding and feeds , Aquaculture , Fishes -- Cannibalism , Fishes -- Feeding and feeds
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59592 , vital:27629
- Description: Many studies have been conducted on the effect of size-grading in other fish species. However, there is a paucity of scientific information on the effects of size variation on cannibalism of juvenile dusky kob. Thus, a study focusing on the effect of size variation on juvenile dusky kob aggressive and feeding (browsing) behaviours was conducted. Three separate groups of hatchery-reared juvenile dusky kob of were obtained from Oceanwise (Pty) Ltd for use in a series of three experimental trials. In all trials, juvenile fish of the same age were size-graded and the COV-value was used to determine the size variation. The focal fish (largest fish) was exposed to groups of fish with different size variation for 30-min. behavioural observations before and after feeding in randomised trials. The first experimental trial (Chapter 2) quantified the effect of increasing size variation and observation time on the aggressive and browsing behaviours of juvenile dusky kob. On average, juvenile dusky kob weighed 3.60 ± 0.68 g fish-1 and measured 5.8 ± 0.41 mm. Each focal fish was observed (a) before feeding in the morning, (b) 2 h after feeding, (c) 6 h after feeding and (d) 12 h after feeding. Fish increased browsing behaviours (averaging 6.60 ± 0.56) and decreased intimidating aggressive behaviours (18.60 ± 1.39) 12 h after feeding. Other aggressive behaviours occurred but did not differ between observation times. Aggressive and browsing behaviours positively correlated with size variation variables, predominantly, 12 h after feeding. An average frequency of 19 chases were observed positively correlated with size variation, followed by average frequencies of 17 body bites and browses, and 11 tail bites per 30 min. Some behaviours including average frequencies of 0.2 chases, 4 tail bites, 2.4 intimidating and 0.3 browsing behaviours negatively correlated with the size variation, generally closer to the last meal. These preliminary observations thus showed that fish have become hungry approximately 6-12 h after feeding and substituted certain behaviours for others as time after feeding passed and as size variation increased. The second experimental trial (Chapter 3) consisted of the observations further testing the relationship between aggressive behaviours and size variation of juveniles of dusky kob averaging 0.43 ± 0.27 g fish-1. The focal fish was exposed to groups of fish of four size variation (COV) treatments for observations before and 12 h after feeding. Aggressive behaviours positively correlated with size variation both before and 12 h after feeding. An average frequency of 437 body bites positively correlated more often with COV, followed by average frequencies of 365 intimidating behaviours and 199 tail bites per 30 min., respectively, before and 12 h after feeding. The least often exhibited aggressive behaviours averaged 26 chases while positively correlating with size variation on the times specified. An average frequency of 311 intimidating behaviours before and after feeding including average of 28 tail bites after feeding negatively correlated with size variation. This may relate to shift of behaviours depending on the needs and capacity of the fish. Apparently, aggressive fish can change its behaviour as a function of COV-values rather than the mean size of the other fish. The third trial (Chapter 4) investigated the effect of the aggressor’s (focal fish) size in relation its aggressive and browsing behaviours to other fish (non-focal fish). Juvenile fish used for this trial, on average, weighed 30 ± 7.63 g fish-1. Aggressive and browsing behaviours were observed in four treatments of a) high COV and mean weight below, b) low COV and mean weight less, c) high COV and mean weight equivalent to and d) low COV and mean weight higher than that of the focal fish. Increased frequencies of aggressive and browsing behaviours per 30 min. occurred in treatment A, sharing similar frequencies in treatment C, compared to the other treatments (B and D) which shared certain frequencies. The intimidating behaviours predominated, followed by browsing, body bites, chases and tail bites, respectively. The results of the overall study suggest that the time passed after feeding and increasing size variation and differences facilitated aggressive and browsing behaviours in juvenile dusky kob. Dusky kob showed increasing aggressive behaviours as early as in the first two weeks after hatching, averaging 0.43 ± 0.27 g fish-1 with the frequency correlating with size differences. Consistent size-grading technique in the same-age fish should be used to manage size variation associated with aggressive behaviours. The period of about 4-6 h after feeding may explain the noticeable increased aggressive and browsing behaviours. Thus, fish should be fed immediately before or after evacuation of their guts to maintain less-aggressive behaviours of juvenile dusky kob. Fish generally increased aggressive and browsing acts before and long time after feeding than closer to after feeding. The study has provided the fundamental scientific groundwork for fish farmers and future researchers can further explore size variation, time after feeding and gut evacuation rate as critical components of aggressive behaviours. The scientific knowledge of aggressive and cannibalistic behaviours has essential application in farming management to achieve improved survival and growth rates in juvenile fish.
- Full Text:
- Date Issued: 2018
The development of an optimised decision based methodology for the replacement timing of frontline equipment utilised within the quarrying industry
- Authors: Basson, Kenneth Mervyn
- Date: 2018
- Subjects: Decision making , Industrial equipment Industrial equipment -- Maintenance and repair
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/23647 , vital:30592
- Description: At present, frontline equipment employed at B&E International, and operating within the quarrying sector is typically replaced as soon as the operating expenses are deemed to be excessive. From a capital budgeting perspective, the trigger for signalling the replacement of equipment occurs when prescribed operating cost performance metrics are violated. In some instances, a further consideration for motivating the replacement of equipment is when the perception arises that the nonavailability of the equipment employed, results in financial losses being incurred by a company. It can therefore be argued that the current equipment replacement timing methodological approach adopted at B&E International is suboptimal in nature. The situation is further aggravated by the fact that in many instances, escalation of commitment manifests itself whereby unnecessary capital is repeatedly invested in order to extend the life of an asset resulting in a situation occurring whereby the required level of investment return is not achieved. In the event of these situations arising, the decision to replace an asset is prolonged as a result of the suboptimal investment decisions being made. The primary focus of this study is to provide a methodological equipment replacement framework that is based upon sound capital budgeting fundamentals. A comprehensive literature review of capital budgeting approaches that specifically focus on the optimal replacement timing of frontline quarrying equipment, did not yield any relevant studies that have been undertaken in this regard. This study did however investigate contemporary equipment replacement approaches based upon a capital budgeting paradigm and highlighted their respective limitations. Convincing evidence obtained, indicated that the most widely accepted method of identifying the optimal replacement timing of equipment occurs when the economic life of the asset is attained. This in itself would therefore infer that a cost minimisation approach is the most pervasive methodological approach adopted in order to identify the optimal replacement timing of equipment. When considering capital investment based decisions, it was found that the discounted cash flow based methodologies are the most widely used and accepted approach applied in the mining industry. Notwithstanding this, one major caveat manifests itself in that when considering the optimal replacement timing of front line equipment within the quarrying industry, the inclusion of uncertainty, flexibility and the associated financial risks was not evident. In order to model these effects, a probabilistic Net Present Value (NPV) approach was adopted and the required Discounted Cash Flow (DCF) models were constructed. Given the uncertainty of the expected cumulative R&M profiles for the asset classes constituting this study, an extensive statistical analysis was carried out in order to establish the required predictive Repair and Maintenance (R&M) models required for the DCF analysis by means of regression analysis. Further regression analyses were conducted in order to model the overall availability and utilisation metrics for the respective asset classes included in this study. The consequence of incurring downtime was investigated and the resultant DCF analysis yielded a significant impact on the Free Cash Flow (FCF) generated by the respective assets. The magnitude of the incurred consequential financial losses incurred as a result of the respective downtime was found to be significant when considering frontline equipment. In order to model the effect of, and the extent to which, the respective independent variables influence the static NPV outcome, a sensitivity analysis was performed. From this, the influence of the independent variables constituting the NPV model employed in this study, were observed. A Real Options Analysis (ROA) approach was initially employed in order to model the effects of FCF uncertainty and the results of carrying out this analysis indicated a minimal influence on the static NPV model referred to earlier. It was therefore concluded that from an equipment replacement timing perspective, the ROA approach did not provide a robust and accurate representation of the probabilistic NPV outcomes anticipated. In order to address these perceived shortcomings, an Monte Carlo Simulation (MCS) model was constructed and the requisite probability distribution functions representing the most influential independent variables determined from the sensitivity analysis were identified and subsequently analysed. The results of the MCS analysis yielded the expected NPV outcomes that were found to be far more conservative compared to the static NPV outcomes referred to previously. Furthermore, the concluding findings of this study indicate that in order to estimate the optimal time to dispose of an asset, a static NPV analysis must first be modelled and thereafter a probabilistic NPV analysis. The respective uncertainty aspects over the lifespan of the assets should be identified to be incorporated into the MCS model. This methodological approach therefore opposes the use of a strictly deterministic based approach and rather predicates the use of a probabilistic NPV based framework. This study further concluded that traditional DCF approaches fail to consider management flexibility in terms of adapting to uncertainty and to also reduce the possibility of “escalation of commitment” occurring as a result of sub-optimal equipment replacement timing decisions by management. The use and acceptance of the traditional DCF approaches are acknowledged, but in order to develop an equipment replacement methodological approach that considers uncertainty and risk on the one hand and also allows for the incorporation of real data over the assets lifetime on the other, the use of an MCS probabilistic NPV based model was found to be the optimal approach to be adopted. The result of updating the static NPV model with updated data as soon as it is obtained enables one to generate accurate probabilistic distribution functions required for the subsequent MCS analysis. By adopting this approach the study has concluded that one can obtain realistic and accurate NPV forecasts from the anticipated FCF estimates. The principal conclusion obtained from this study is that the optimal time in which to replace front line assets employed at B&E International is when the probabilistic net earnings profile, viz., NPV of the equipment is maximized.
- Full Text:
- Date Issued: 2018
- Authors: Basson, Kenneth Mervyn
- Date: 2018
- Subjects: Decision making , Industrial equipment Industrial equipment -- Maintenance and repair
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/23647 , vital:30592
- Description: At present, frontline equipment employed at B&E International, and operating within the quarrying sector is typically replaced as soon as the operating expenses are deemed to be excessive. From a capital budgeting perspective, the trigger for signalling the replacement of equipment occurs when prescribed operating cost performance metrics are violated. In some instances, a further consideration for motivating the replacement of equipment is when the perception arises that the nonavailability of the equipment employed, results in financial losses being incurred by a company. It can therefore be argued that the current equipment replacement timing methodological approach adopted at B&E International is suboptimal in nature. The situation is further aggravated by the fact that in many instances, escalation of commitment manifests itself whereby unnecessary capital is repeatedly invested in order to extend the life of an asset resulting in a situation occurring whereby the required level of investment return is not achieved. In the event of these situations arising, the decision to replace an asset is prolonged as a result of the suboptimal investment decisions being made. The primary focus of this study is to provide a methodological equipment replacement framework that is based upon sound capital budgeting fundamentals. A comprehensive literature review of capital budgeting approaches that specifically focus on the optimal replacement timing of frontline quarrying equipment, did not yield any relevant studies that have been undertaken in this regard. This study did however investigate contemporary equipment replacement approaches based upon a capital budgeting paradigm and highlighted their respective limitations. Convincing evidence obtained, indicated that the most widely accepted method of identifying the optimal replacement timing of equipment occurs when the economic life of the asset is attained. This in itself would therefore infer that a cost minimisation approach is the most pervasive methodological approach adopted in order to identify the optimal replacement timing of equipment. When considering capital investment based decisions, it was found that the discounted cash flow based methodologies are the most widely used and accepted approach applied in the mining industry. Notwithstanding this, one major caveat manifests itself in that when considering the optimal replacement timing of front line equipment within the quarrying industry, the inclusion of uncertainty, flexibility and the associated financial risks was not evident. In order to model these effects, a probabilistic Net Present Value (NPV) approach was adopted and the required Discounted Cash Flow (DCF) models were constructed. Given the uncertainty of the expected cumulative R&M profiles for the asset classes constituting this study, an extensive statistical analysis was carried out in order to establish the required predictive Repair and Maintenance (R&M) models required for the DCF analysis by means of regression analysis. Further regression analyses were conducted in order to model the overall availability and utilisation metrics for the respective asset classes included in this study. The consequence of incurring downtime was investigated and the resultant DCF analysis yielded a significant impact on the Free Cash Flow (FCF) generated by the respective assets. The magnitude of the incurred consequential financial losses incurred as a result of the respective downtime was found to be significant when considering frontline equipment. In order to model the effect of, and the extent to which, the respective independent variables influence the static NPV outcome, a sensitivity analysis was performed. From this, the influence of the independent variables constituting the NPV model employed in this study, were observed. A Real Options Analysis (ROA) approach was initially employed in order to model the effects of FCF uncertainty and the results of carrying out this analysis indicated a minimal influence on the static NPV model referred to earlier. It was therefore concluded that from an equipment replacement timing perspective, the ROA approach did not provide a robust and accurate representation of the probabilistic NPV outcomes anticipated. In order to address these perceived shortcomings, an Monte Carlo Simulation (MCS) model was constructed and the requisite probability distribution functions representing the most influential independent variables determined from the sensitivity analysis were identified and subsequently analysed. The results of the MCS analysis yielded the expected NPV outcomes that were found to be far more conservative compared to the static NPV outcomes referred to previously. Furthermore, the concluding findings of this study indicate that in order to estimate the optimal time to dispose of an asset, a static NPV analysis must first be modelled and thereafter a probabilistic NPV analysis. The respective uncertainty aspects over the lifespan of the assets should be identified to be incorporated into the MCS model. This methodological approach therefore opposes the use of a strictly deterministic based approach and rather predicates the use of a probabilistic NPV based framework. This study further concluded that traditional DCF approaches fail to consider management flexibility in terms of adapting to uncertainty and to also reduce the possibility of “escalation of commitment” occurring as a result of sub-optimal equipment replacement timing decisions by management. The use and acceptance of the traditional DCF approaches are acknowledged, but in order to develop an equipment replacement methodological approach that considers uncertainty and risk on the one hand and also allows for the incorporation of real data over the assets lifetime on the other, the use of an MCS probabilistic NPV based model was found to be the optimal approach to be adopted. The result of updating the static NPV model with updated data as soon as it is obtained enables one to generate accurate probabilistic distribution functions required for the subsequent MCS analysis. By adopting this approach the study has concluded that one can obtain realistic and accurate NPV forecasts from the anticipated FCF estimates. The principal conclusion obtained from this study is that the optimal time in which to replace front line assets employed at B&E International is when the probabilistic net earnings profile, viz., NPV of the equipment is maximized.
- Full Text:
- Date Issued: 2018
There’s another story here
- Authors: Nkosi, Lindokuhle
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63065 , vital:28360
- Description: Written in fragments and combining fiction and narrative non-fiction, this novella explores how South Africa's history of violence and current violence against women affects and influences how women relate to each other. Based in the knowledge that our memories and behaviours are linked to the experiences of our ancestors via our bodies, I engage what our violent history and the disappearing myths that are still embedded in our bloodstream mean for life today. Drawing on the experiences of several generations of women in my family, current affairs and the lives of women close to me, my novella picks at the fragile things that hold us together. I take influence from the prose poetry in Claudia Rankine’s Citizen, and the use of fragmentation, myth and biography in Lydia Yuknavitch’s A Chronology of Water and Lily Hoang’s A Bestiary, and use an amalgam of genres to ask how we hold each other; how we breath, create, love and dream.
- Full Text:
- Date Issued: 2018
- Authors: Nkosi, Lindokuhle
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63065 , vital:28360
- Description: Written in fragments and combining fiction and narrative non-fiction, this novella explores how South Africa's history of violence and current violence against women affects and influences how women relate to each other. Based in the knowledge that our memories and behaviours are linked to the experiences of our ancestors via our bodies, I engage what our violent history and the disappearing myths that are still embedded in our bloodstream mean for life today. Drawing on the experiences of several generations of women in my family, current affairs and the lives of women close to me, my novella picks at the fragile things that hold us together. I take influence from the prose poetry in Claudia Rankine’s Citizen, and the use of fragmentation, myth and biography in Lydia Yuknavitch’s A Chronology of Water and Lily Hoang’s A Bestiary, and use an amalgam of genres to ask how we hold each other; how we breath, create, love and dream.
- Full Text:
- Date Issued: 2018
Black South African men’s adjustment to divorce: a divorce-stress-adjustment model
- Muchena, Kudakwashe Christopher
- Authors: Muchena, Kudakwashe Christopher
- Date: 2018
- Subjects: Divorce -- Psychological aspects , Social psychology Men -- Psychology
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/50121 , vital:42048
- Description: The decision to divorce marks a turning point for each individual involved. It can be viewed as more than just a legal process. From a psychological perspective, it does not matter who initiated the divorce, it always comes with emotional ramifications for all those involved. Statistically there is a high rate of divorce in South Africa and there have been significant shifts in trends over time. However, black South African men’s experience of, action in, and adjustment to divorce has been relatively neglected in the divorce research, yet it is important for understanding contemporary social arrangements and processes, as well as for broadening the understanding of black South African men’s lives. How black South African men describe their situations and respond to marital dissolution may point to their positions in the gender-structured community and to how they interpret the nature of social practice, marriages, divorce and their position in society. The present study aimed at exploring black South African men’s experience of, and adjustment to, divorce. More specifically, the study developed a divorce-stress-adjustment model for divorced black South African men. The theoretical framework underpinning this study was that of Symbolic Interactionism that was complemented and enhanced by Erikson’s Psychosocial Theory, focusing specifically on identity development in adulthood. This was a qualitative study using an Interpretative Phenomenological Analysis (IPA) as both the research design and data analytic theory and process. The eight participants were volunteers who were recruited purposively. In accordance with IPA guidelines, data for the study was collected using biographical questionnaires and semi-structured interviews. The emerging themes were grouped into four superordinate themes, that is, pre-divorce experiences, experiencing divorce, adjustment process and post-divorce experience. Each superordinate theme had corresponding subordinate themes and subthemes. The themes were then used to develop the divorce-stress adjustment model indicating that the experience of divorce is an interconnected process. Weed’s recommendations for interpretative synthesis of interview data were used.
- Full Text:
- Date Issued: 2018
- Authors: Muchena, Kudakwashe Christopher
- Date: 2018
- Subjects: Divorce -- Psychological aspects , Social psychology Men -- Psychology
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/50121 , vital:42048
- Description: The decision to divorce marks a turning point for each individual involved. It can be viewed as more than just a legal process. From a psychological perspective, it does not matter who initiated the divorce, it always comes with emotional ramifications for all those involved. Statistically there is a high rate of divorce in South Africa and there have been significant shifts in trends over time. However, black South African men’s experience of, action in, and adjustment to divorce has been relatively neglected in the divorce research, yet it is important for understanding contemporary social arrangements and processes, as well as for broadening the understanding of black South African men’s lives. How black South African men describe their situations and respond to marital dissolution may point to their positions in the gender-structured community and to how they interpret the nature of social practice, marriages, divorce and their position in society. The present study aimed at exploring black South African men’s experience of, and adjustment to, divorce. More specifically, the study developed a divorce-stress-adjustment model for divorced black South African men. The theoretical framework underpinning this study was that of Symbolic Interactionism that was complemented and enhanced by Erikson’s Psychosocial Theory, focusing specifically on identity development in adulthood. This was a qualitative study using an Interpretative Phenomenological Analysis (IPA) as both the research design and data analytic theory and process. The eight participants were volunteers who were recruited purposively. In accordance with IPA guidelines, data for the study was collected using biographical questionnaires and semi-structured interviews. The emerging themes were grouped into four superordinate themes, that is, pre-divorce experiences, experiencing divorce, adjustment process and post-divorce experience. Each superordinate theme had corresponding subordinate themes and subthemes. The themes were then used to develop the divorce-stress adjustment model indicating that the experience of divorce is an interconnected process. Weed’s recommendations for interpretative synthesis of interview data were used.
- Full Text:
- Date Issued: 2018
The environmental imagination in Arthur Nortje’s poetry
- Authors: Kaze, Douglas Eric
- Date: 2018
- Subjects: Nortje, Arthur, 1942-1970 -- Criticism and interpretation , Ecology in literature , Race awareness in literature , South African poetry (English) -- History and criticism , Nature in literature , Transversal postcolonial environmental criticism
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/58024 , vital:27033
- Description: This thesis seeks to contribute to the conversations in the humanities about the treatment of the physical environment in the context of a global ecological fragility and increased scholarly interest in the poetry of Arthur Nortje, a South African poet who wrote in the 1960s. While previous studies on Nortje concentrate on the political, psychic and technical aspects of his poetry, this study particularly explores the representations of the environment in Nortje’s poetic imagination. Writing in the dark period of apartheid in South Africa’s history, Nortje’s poetry articulates a strong interest in the physical environment against the backdrop of official racialization of space and his personal nomadic life and exile. The poetry abounds with constant intersections of nature and culture (industrialism, urbanity and the quotidian), a sense of place and a deep sense of dislocation. The poems, therefore, present a platform from which to reevaluate conventional ecocritical ideas about nature, place-attachment and environmental consciousness. Drawing mainly on Felix Guattari’s ideas of three ecologies and transversality along with other theories, I conduct the study through what I call a transversal postcolonial environmental criticism, which considers the ecological value of the kind of assemblages that Nortje’s works represent. The first chapter focuses on conceptualizing a postcolonial approach to the environment based on Guattari’s concept of transversality to lay the theoretical foundation for the whole work. The second chapter analyses Nortje’s poetic imagination of place and displacement through his treatment of the private-public tension and the motif of exile. While the third chapter examines Nortje’s depiction of nature as both an everyday and urban phenomenon, the fourth chapter turns to his direct treatment of environmental crises handled through his imagination of the Canadian urban spaces, exile memory of apartheid geography, war and ecocide and the human body as a subject of environmental degradation. The fifth chapter, which is the conclusion, takes a brief look at the implication of Nortje’s complex treatment of the environment on postcolonial environmentalism.
- Full Text:
- Date Issued: 2018
- Authors: Kaze, Douglas Eric
- Date: 2018
- Subjects: Nortje, Arthur, 1942-1970 -- Criticism and interpretation , Ecology in literature , Race awareness in literature , South African poetry (English) -- History and criticism , Nature in literature , Transversal postcolonial environmental criticism
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/58024 , vital:27033
- Description: This thesis seeks to contribute to the conversations in the humanities about the treatment of the physical environment in the context of a global ecological fragility and increased scholarly interest in the poetry of Arthur Nortje, a South African poet who wrote in the 1960s. While previous studies on Nortje concentrate on the political, psychic and technical aspects of his poetry, this study particularly explores the representations of the environment in Nortje’s poetic imagination. Writing in the dark period of apartheid in South Africa’s history, Nortje’s poetry articulates a strong interest in the physical environment against the backdrop of official racialization of space and his personal nomadic life and exile. The poetry abounds with constant intersections of nature and culture (industrialism, urbanity and the quotidian), a sense of place and a deep sense of dislocation. The poems, therefore, present a platform from which to reevaluate conventional ecocritical ideas about nature, place-attachment and environmental consciousness. Drawing mainly on Felix Guattari’s ideas of three ecologies and transversality along with other theories, I conduct the study through what I call a transversal postcolonial environmental criticism, which considers the ecological value of the kind of assemblages that Nortje’s works represent. The first chapter focuses on conceptualizing a postcolonial approach to the environment based on Guattari’s concept of transversality to lay the theoretical foundation for the whole work. The second chapter analyses Nortje’s poetic imagination of place and displacement through his treatment of the private-public tension and the motif of exile. While the third chapter examines Nortje’s depiction of nature as both an everyday and urban phenomenon, the fourth chapter turns to his direct treatment of environmental crises handled through his imagination of the Canadian urban spaces, exile memory of apartheid geography, war and ecocide and the human body as a subject of environmental degradation. The fifth chapter, which is the conclusion, takes a brief look at the implication of Nortje’s complex treatment of the environment on postcolonial environmentalism.
- Full Text:
- Date Issued: 2018
The impact of the construction regulations 2014 on a water utility’s projects’ health and safety performance in South Africa
- Authors: Malindi, Rajandree Mandy
- Date: 2018
- Subjects: Construction industry -- Safety regulations -- South Africa , Construction industry -- Standards -- South Africa Construction industry -- Law and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/31655 , vital:31645
- Description: The construction industry plays a major role in South Africa’s economic development. Since promulgation of the Construction Regulations, the expectation is that project stakeholders are placing more emphasis on H&S to contribute to project success. The study aimed to assess the impact of the involvement of clients and other project stakeholders on the overall project H&S performance on projects undertaken by a large water utility. The scope was limited to the organisation’s engineering and operations division and its internal project stakeholders, namely the designers, quantity surveyors, project managers, and construction H&S professionals. Local literature pointed out that poor construction H&S performance is attributable to a lack of management commitment, inadequate supervision, inadequate or lack of H&S training, lack of worker involvement, personal risk appreciation and work pressures (cidb, 2009: 37). International literature indicated that the total CoA exceeds the cost of H&S (cidb, 2009: 9). Quantitative methods were utilised in two phases to gather and analyse data. In Phase 1, a questionnaire was developed and distributed to a target population, and in Phase 2, data was obtained from existing records of historic and completed project files for projects undertaken by the water utility. A total of 67 responses were used to analyse data. All stakeholders somehow contributed to H&S however, most respondents regarded CHS professionals, contractors and PMs as the primary stakeholders. The study found that stakeholders perceived H&S to be influenced during the later rather than the initial stages of projects and that H&S actions were significantly undertaken during stage 5. The frequency of H&S actions varied with each stakeholder dependent on the stage in which they were involved in. Recommendations were for H&S to be integrated in the initial stages of projects and for a follow up research to be conducted to investigate if there are improvements during the six project stages after full implementation of the Construction Regulations 2014. This requirement will force industry to comply and most importantly to drive joint efforts by the various stakeholders.
- Full Text:
- Date Issued: 2018
- Authors: Malindi, Rajandree Mandy
- Date: 2018
- Subjects: Construction industry -- Safety regulations -- South Africa , Construction industry -- Standards -- South Africa Construction industry -- Law and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/31655 , vital:31645
- Description: The construction industry plays a major role in South Africa’s economic development. Since promulgation of the Construction Regulations, the expectation is that project stakeholders are placing more emphasis on H&S to contribute to project success. The study aimed to assess the impact of the involvement of clients and other project stakeholders on the overall project H&S performance on projects undertaken by a large water utility. The scope was limited to the organisation’s engineering and operations division and its internal project stakeholders, namely the designers, quantity surveyors, project managers, and construction H&S professionals. Local literature pointed out that poor construction H&S performance is attributable to a lack of management commitment, inadequate supervision, inadequate or lack of H&S training, lack of worker involvement, personal risk appreciation and work pressures (cidb, 2009: 37). International literature indicated that the total CoA exceeds the cost of H&S (cidb, 2009: 9). Quantitative methods were utilised in two phases to gather and analyse data. In Phase 1, a questionnaire was developed and distributed to a target population, and in Phase 2, data was obtained from existing records of historic and completed project files for projects undertaken by the water utility. A total of 67 responses were used to analyse data. All stakeholders somehow contributed to H&S however, most respondents regarded CHS professionals, contractors and PMs as the primary stakeholders. The study found that stakeholders perceived H&S to be influenced during the later rather than the initial stages of projects and that H&S actions were significantly undertaken during stage 5. The frequency of H&S actions varied with each stakeholder dependent on the stage in which they were involved in. Recommendations were for H&S to be integrated in the initial stages of projects and for a follow up research to be conducted to investigate if there are improvements during the six project stages after full implementation of the Construction Regulations 2014. This requirement will force industry to comply and most importantly to drive joint efforts by the various stakeholders.
- Full Text:
- Date Issued: 2018
Urban agriculture and stokvels
- Authors: Sonti, Yolisa Wendy
- Date: 2018
- Subjects: Urban agriculture -- Economic aspects , Agriculture -- Finance Cooperative societies
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/23142 , vital:30433
- Description: Agriculture has been identified as a strategy for sustainable development in an attempt to improve food security and alleviate poverty around the world. Urban agriculture is the practise of farming and gardening in urban and peri-urban areas. There has been a growing trend to involve innovative methods to urban agriculture due to lack of land in urban areas. Stokvels are informal saving groups popularly used in South Africa. This is one of the strategies families in South Africa use to generate income, as a result of the high rate of unemployment in the country. The income from stokvels is used by members to source food and sustain their families. This study aims to investigate the possibility of using stokvels in urban agriculture for entrepreneurial purposes to improve the level of food security and alleviate unemployment and increase the household income of families in South Africa. This study therefore reviews literature on urban agriculture and identifies its enablers and barriers. Literature on stokvels is also reviewed, the reasons for participation in stokvels are highlighted and the different types of stokvels are also identified. The literature that was reviewed on urban agriculture and stokvels informed the questionnaire of the study. A self-administered questionnaire was distributed to a representative sample of 152 stokvel members in the Nelson Mandela Bay Area. The results from the questionnaire were then analysed using univariate analysis and descriptive statistics. Multivariate analysis and inferential statistics were also used for data analysis. The findings of the study revealed that stokvel members know agriculture activities although they do not use their stokvel funds to participate in urban agriculture. The study found that stokvel members participate in stokvels as means to generate income for their households. It was also found that there is interest among stokvel members to use their stokvel funds in urban agriculture. A conceptual model of urban agriculture for stokvel members was developed from the study which enabled the possibility for future detailed research in testing the model.
- Full Text:
- Date Issued: 2018
- Authors: Sonti, Yolisa Wendy
- Date: 2018
- Subjects: Urban agriculture -- Economic aspects , Agriculture -- Finance Cooperative societies
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/23142 , vital:30433
- Description: Agriculture has been identified as a strategy for sustainable development in an attempt to improve food security and alleviate poverty around the world. Urban agriculture is the practise of farming and gardening in urban and peri-urban areas. There has been a growing trend to involve innovative methods to urban agriculture due to lack of land in urban areas. Stokvels are informal saving groups popularly used in South Africa. This is one of the strategies families in South Africa use to generate income, as a result of the high rate of unemployment in the country. The income from stokvels is used by members to source food and sustain their families. This study aims to investigate the possibility of using stokvels in urban agriculture for entrepreneurial purposes to improve the level of food security and alleviate unemployment and increase the household income of families in South Africa. This study therefore reviews literature on urban agriculture and identifies its enablers and barriers. Literature on stokvels is also reviewed, the reasons for participation in stokvels are highlighted and the different types of stokvels are also identified. The literature that was reviewed on urban agriculture and stokvels informed the questionnaire of the study. A self-administered questionnaire was distributed to a representative sample of 152 stokvel members in the Nelson Mandela Bay Area. The results from the questionnaire were then analysed using univariate analysis and descriptive statistics. Multivariate analysis and inferential statistics were also used for data analysis. The findings of the study revealed that stokvel members know agriculture activities although they do not use their stokvel funds to participate in urban agriculture. The study found that stokvel members participate in stokvels as means to generate income for their households. It was also found that there is interest among stokvel members to use their stokvel funds in urban agriculture. A conceptual model of urban agriculture for stokvel members was developed from the study which enabled the possibility for future detailed research in testing the model.
- Full Text:
- Date Issued: 2018
Participatory development communication and the sustainability of poverty alleviation projects in Lesotho : a case of Lifajaneng
- Authors: Ntobo-Letsie, Hlompho
- Date: 2018
- Subjects: Communication in economic development Communication in rural development Economic assistance, Domestic
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/10244 , vital:35384
- Description: This study aimed at assessing the impact of communication on the sustainability of poverty alleviation programmes established for selected beneficiaries in the rural community of Lifajaneng. This is conducted with the purpose of understanding how the Mafeteng community engages in the poverty alleviation projects carried out within their area of residence, so as to encourage more commitment in participation. The conceptual framework for this study is the empowerment approach and the study is informed by two theories; the participatory communication theory and the diffusion of innovation theory. The study employed the mixed method approach to gather and analyze the data; that is using questionnaires, focus group discussions and face to face interviews to solicit for information from project participants and project managers. The quantitative data was presented and analyzed through charts and graphs buttressed with themes that emerged in the qualitative data. The study revealed that the sustainability of the poverty alleviation projects remains questionable due to a number of challenges. The results reflect that communities are more comfortable when the mother language (Sesotho) is used predominantly as the medium of communication. The results also reflected that meetings had a higher attendance rate if called for by local leaders through word of mouth followed by communications done telephonically. Mainstream media such as radio and newspapers were the least effective when mobilizing the communities for meetings related to the poverty alleviation projects in the poor community. The study also unfolded the following issues; lack of full participation and commitment of the beneficiaries, inadequate funding to allow sufficient training of the beneficiaries. This is because the funds had some strings attached and the beneficiaries had their own expectations of the funds, therefore the objectives and the limits of the funder did not match the objectives and the limitations of the beneficiaries. Hence, the end results are lack of motivation for the beneficiaries.
- Full Text:
- Date Issued: 2018
- Authors: Ntobo-Letsie, Hlompho
- Date: 2018
- Subjects: Communication in economic development Communication in rural development Economic assistance, Domestic
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/10244 , vital:35384
- Description: This study aimed at assessing the impact of communication on the sustainability of poverty alleviation programmes established for selected beneficiaries in the rural community of Lifajaneng. This is conducted with the purpose of understanding how the Mafeteng community engages in the poverty alleviation projects carried out within their area of residence, so as to encourage more commitment in participation. The conceptual framework for this study is the empowerment approach and the study is informed by two theories; the participatory communication theory and the diffusion of innovation theory. The study employed the mixed method approach to gather and analyze the data; that is using questionnaires, focus group discussions and face to face interviews to solicit for information from project participants and project managers. The quantitative data was presented and analyzed through charts and graphs buttressed with themes that emerged in the qualitative data. The study revealed that the sustainability of the poverty alleviation projects remains questionable due to a number of challenges. The results reflect that communities are more comfortable when the mother language (Sesotho) is used predominantly as the medium of communication. The results also reflected that meetings had a higher attendance rate if called for by local leaders through word of mouth followed by communications done telephonically. Mainstream media such as radio and newspapers were the least effective when mobilizing the communities for meetings related to the poverty alleviation projects in the poor community. The study also unfolded the following issues; lack of full participation and commitment of the beneficiaries, inadequate funding to allow sufficient training of the beneficiaries. This is because the funds had some strings attached and the beneficiaries had their own expectations of the funds, therefore the objectives and the limits of the funder did not match the objectives and the limitations of the beneficiaries. Hence, the end results are lack of motivation for the beneficiaries.
- Full Text:
- Date Issued: 2018
Predicting reintroduction outcomes: assessing the feasibility of reintroducing African wild dog to a small protected area
- Authors: Vogel, John Thomas
- Date: 2018
- Subjects: African wild dog , Wild dogs -- South Africa Wild dogs -- Conservation -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/36464 , vital:33947
- Description: Large mammalian carnivores have experienced significant contractions in population sizes and geographical ranges. The conservation of large carnivores is crucially important, particularly due to their vulnerability to extinction and their functional significance and ability to structure ecosystems. Due to an expanding human footprint, large carnivores are increasingly subject to modified and spatially constrained habitats. A growing debate exists as to how to conserve and coexist with large carnivores in an anthropogenically induced environment. Reintroduction, as a conservation tool to restore locally extirpated large carnivores to portions of their former ranges is increasingly being applied. However, in South Africa, habitat to support large carnivores remain small and non-contiguous. Food is a fundamental ecological requirement to sustain reintroduced large carnivores. Therefore, an understanding of large predator foraging patterns can be informative in the context of how the predator species influences and utilises a novel ecosystem. We investigated the foraging behaviour of reintroduced African wild dog (Lycaon pictus) at five small protected areas in KwaZulu-Natal, South Africa. Wild dog utilised 16 prey species, albeit they primarily used nyala (Tragelaphus angasii) and impala (Aepyceros melampus) which collectively form 75 % of their diet. Only nyala was significantly preferred, suggesting that this prey species is used in greater proportion to their abundance. As wild dogs are social cooperative hunters, we tested whether wild dog pack size was correlated to prey mass selection. There was no evidence to suggest that larger packs use larger prey. However, the mean wild dog pack size in our sample sites, was relatively smaller than those encountered elsewhere. Furthermore, wild dog have been shown to modify their hunting behaviour in the presence of wildlife-proof fencing, by using fences to aid in the capture of larger prey species than would innately occur. We compared the prey mass of wild dog kills in relation to proximity of these hard boundaries. Despite the affinity towards kills occurring within 200 m of fences, the upward bias caused by fences on prey mass selection was inconsistent across sample sites. The relatively small size of wild dogs makes them particularly vulnerable to competition. As the energetic output of wild dog is high, interspecific competition can increase foraging costs. The reintroduction of large carnivores to small artificially induced systems may be a contentious issue as resources available to support large carnivores are expected to be relatively more finite. We compared both the potential inter- and intraspecific dietary niche dimensions of an intact large carnivore guild in context of a wild dog reintroduction. We determined cheetah (Acinonyx jubatus), leopard (Panthera pardus), and lion (Panthera leo) prey composition, diet breadth, overlap, prey preference and predicted the density of an intact large carnivore guild in a novel landscape. Further, we compared the foraging behaviour of these large carnivores to that of wild dog. Our findings suggest that large African carnivores in small protected areas are subject to a considerable dietary niche overlap. Wild dog and cheetah, particularly reproductive females with dependent offspring, displayed the greatest potential for dietary overlap and subsequent competition. Leopard and lion at the population species level exhibited greater degrees of foraging plasticity. Lion displayed a contrasting prey species preference to sympatric predators as they selected for prey items frequently avoided by cheetah, leopard and wild dog. The proposed wild dog reintroduction site is expected to sustain seven wild dog based on the availability of preferred prey biomass. However, the reintroduction of wild dog to the small protected area is expected to have negative lateral trophic influences on other species of conservation concern. This should be of vital importance to management of the protected area. As the influence of competition in food-web and population dynamics, particularly in resource poor environments may be profound, our research highlights the need to assess the influence of competitive forces in structuring and restoring large predators to portions of their historical range.
- Full Text:
- Date Issued: 2018
- Authors: Vogel, John Thomas
- Date: 2018
- Subjects: African wild dog , Wild dogs -- South Africa Wild dogs -- Conservation -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/36464 , vital:33947
- Description: Large mammalian carnivores have experienced significant contractions in population sizes and geographical ranges. The conservation of large carnivores is crucially important, particularly due to their vulnerability to extinction and their functional significance and ability to structure ecosystems. Due to an expanding human footprint, large carnivores are increasingly subject to modified and spatially constrained habitats. A growing debate exists as to how to conserve and coexist with large carnivores in an anthropogenically induced environment. Reintroduction, as a conservation tool to restore locally extirpated large carnivores to portions of their former ranges is increasingly being applied. However, in South Africa, habitat to support large carnivores remain small and non-contiguous. Food is a fundamental ecological requirement to sustain reintroduced large carnivores. Therefore, an understanding of large predator foraging patterns can be informative in the context of how the predator species influences and utilises a novel ecosystem. We investigated the foraging behaviour of reintroduced African wild dog (Lycaon pictus) at five small protected areas in KwaZulu-Natal, South Africa. Wild dog utilised 16 prey species, albeit they primarily used nyala (Tragelaphus angasii) and impala (Aepyceros melampus) which collectively form 75 % of their diet. Only nyala was significantly preferred, suggesting that this prey species is used in greater proportion to their abundance. As wild dogs are social cooperative hunters, we tested whether wild dog pack size was correlated to prey mass selection. There was no evidence to suggest that larger packs use larger prey. However, the mean wild dog pack size in our sample sites, was relatively smaller than those encountered elsewhere. Furthermore, wild dog have been shown to modify their hunting behaviour in the presence of wildlife-proof fencing, by using fences to aid in the capture of larger prey species than would innately occur. We compared the prey mass of wild dog kills in relation to proximity of these hard boundaries. Despite the affinity towards kills occurring within 200 m of fences, the upward bias caused by fences on prey mass selection was inconsistent across sample sites. The relatively small size of wild dogs makes them particularly vulnerable to competition. As the energetic output of wild dog is high, interspecific competition can increase foraging costs. The reintroduction of large carnivores to small artificially induced systems may be a contentious issue as resources available to support large carnivores are expected to be relatively more finite. We compared both the potential inter- and intraspecific dietary niche dimensions of an intact large carnivore guild in context of a wild dog reintroduction. We determined cheetah (Acinonyx jubatus), leopard (Panthera pardus), and lion (Panthera leo) prey composition, diet breadth, overlap, prey preference and predicted the density of an intact large carnivore guild in a novel landscape. Further, we compared the foraging behaviour of these large carnivores to that of wild dog. Our findings suggest that large African carnivores in small protected areas are subject to a considerable dietary niche overlap. Wild dog and cheetah, particularly reproductive females with dependent offspring, displayed the greatest potential for dietary overlap and subsequent competition. Leopard and lion at the population species level exhibited greater degrees of foraging plasticity. Lion displayed a contrasting prey species preference to sympatric predators as they selected for prey items frequently avoided by cheetah, leopard and wild dog. The proposed wild dog reintroduction site is expected to sustain seven wild dog based on the availability of preferred prey biomass. However, the reintroduction of wild dog to the small protected area is expected to have negative lateral trophic influences on other species of conservation concern. This should be of vital importance to management of the protected area. As the influence of competition in food-web and population dynamics, particularly in resource poor environments may be profound, our research highlights the need to assess the influence of competitive forces in structuring and restoring large predators to portions of their historical range.
- Full Text:
- Date Issued: 2018