A rock in the seething chasm : Thomas Keating's understanding of the human person and of spirituality as a basis for contemporary pastoral counselling
- Authors: Burton, Rodney Lawrence
- Date: 1998
- Subjects: Pastoral counselling Psychology and religion Psychology and religion Spirituality -- Christianity Spiritual life -- Christianity Keating, Thomas -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1246 , http://hdl.handle.net/10962/d1009960
- Description: Contemporary pastoral counselling has many unresolved problems associated with its practice, causing frustration for both counsellors and counsellees. This thesis suggests that such problems are related to the fact that pastoral counselling is overshadowed by the dominant schools of psychology, to the detriment of its spirituality. Furthermore, by attending to both its "values" and its "aims", contemporary pastoral counselling is shown to lack a distinctive theoretical base. This thesis proposes that pastoral counselling is, in fact, the reparative dimension of spiritual direction. Referring to such counselling as " therapeutic spiritual direction" best expresses this concept. Some of the ways in which this redefinition of pastoral counselling may alleviate problems which are currently experienced, particularly by counsellors, are highlighted. A spirituality appropriate to this discipline is outlined. Both Keating's life in general, and eight anthropological models used in conjunction with his teaching on Centering Prayer, are examined to provide a theological foundation for therapeutic spiritual direction. Utilising a conflation of Keating's models, supplemented by insights from his spirituality, individuals are located within an evolutionary-developmental context, within which the reality of sin is acknowledged. Attention is given, in a holistic fashion, to the physical, emotional, and spiritual faculties, and to relationships with both the world at large, and God in particular. Real and potential problems in emotional and spiritual formation are explained with reference to four "energy centres". Therapeutic spiritual direction is characterised by the environment within which it is conducted, and SLX identifiable stages through which it passes. Based on Keating's models, an Instrument is developed to facilitate such counselling, particularly in its diagnostic phases. Use of the means of grace and traditionally Christian disciplines and forms of ministry are emphasised for healing, and a spectrum of suggested treatment modalities is generated. The place of other health-care disciplines and social-care agencies is recognised, and discriminating co-operation and dialogue with them and with other faith traditions is encouraged This thesis has profound significance for the way in which pastoral counselling should be practised. In the light of these insights, some implications for the training of counsellors and for ministry in South Africa are noted.
- Full Text:
- Authors: Burton, Rodney Lawrence
- Date: 1998
- Subjects: Pastoral counselling Psychology and religion Psychology and religion Spirituality -- Christianity Spiritual life -- Christianity Keating, Thomas -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1246 , http://hdl.handle.net/10962/d1009960
- Description: Contemporary pastoral counselling has many unresolved problems associated with its practice, causing frustration for both counsellors and counsellees. This thesis suggests that such problems are related to the fact that pastoral counselling is overshadowed by the dominant schools of psychology, to the detriment of its spirituality. Furthermore, by attending to both its "values" and its "aims", contemporary pastoral counselling is shown to lack a distinctive theoretical base. This thesis proposes that pastoral counselling is, in fact, the reparative dimension of spiritual direction. Referring to such counselling as " therapeutic spiritual direction" best expresses this concept. Some of the ways in which this redefinition of pastoral counselling may alleviate problems which are currently experienced, particularly by counsellors, are highlighted. A spirituality appropriate to this discipline is outlined. Both Keating's life in general, and eight anthropological models used in conjunction with his teaching on Centering Prayer, are examined to provide a theological foundation for therapeutic spiritual direction. Utilising a conflation of Keating's models, supplemented by insights from his spirituality, individuals are located within an evolutionary-developmental context, within which the reality of sin is acknowledged. Attention is given, in a holistic fashion, to the physical, emotional, and spiritual faculties, and to relationships with both the world at large, and God in particular. Real and potential problems in emotional and spiritual formation are explained with reference to four "energy centres". Therapeutic spiritual direction is characterised by the environment within which it is conducted, and SLX identifiable stages through which it passes. Based on Keating's models, an Instrument is developed to facilitate such counselling, particularly in its diagnostic phases. Use of the means of grace and traditionally Christian disciplines and forms of ministry are emphasised for healing, and a spectrum of suggested treatment modalities is generated. The place of other health-care disciplines and social-care agencies is recognised, and discriminating co-operation and dialogue with them and with other faith traditions is encouraged This thesis has profound significance for the way in which pastoral counselling should be practised. In the light of these insights, some implications for the training of counsellors and for ministry in South Africa are noted.
- Full Text:
The impact of HAART on sexuality and medicine taking behaviours among people living with HIV/AIDS in Grahamstown
- Authors: Chizanga, Tongai Aldridge
- Date: 2010
- Subjects: AIDS (Disease) -- Treatment -- South Africa -- Grahamstown HIV infections -- Treatment -- South Africa -- Grahamstown Antiretroviral agents -- South Africa -- Grahamstown Patient compliance -- South Africa -- Grahamstown AIDS (Disease) -- Social aspects -- South Africa -- Grahamstown HIV infections -- Social aspects -- South Africa -- Grahamstown AIDS (Disease) -- Patients -- South Africa -- Grahamstown -- Sexual behavior HIV-positive persons -- South Africa -- Grahamstown -- Sexual behavior Patient education -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:3750 , http://hdl.handle.net/10962/d1003228
- Description: Introduction: Adherence to Highly Active Antiretroviral Therapy (HAART) is critical for optimal therapeutic outcomes. A possible factor in adherence is the impact of HAART on sexual functioning. Methods: A mixed methods approach was used. A cohort of 14 people living with HIV/AIDS (PLWHA) in Grahamstown was identified. Two semi-structured interviews and two structured questionnaires were administered. In-depth interviews were conducted with two HIV counsellors in so as to obtain a different perspective on the topics. The theoretical framework used three health behaviour models: the Health Belief Model, Leventhal‘s Common-Sense Model of self regulation and the Transtheoretical model. Results: The participants were between 27 and 49 years old and had been on HAART for between 9 months and 10 years. Six participants were support staff members from Rhodes University and eight from the Raphael Centre – a local NGO which assists PLWHA.In most of the participants HAART was associated with increased libido and improved sexual functioning (sexual activity and sexual enjoyment). The use of alcohol increased risky sexual behaviour. Issues of adherence were seemingly not directly affected by the effects of HAART on sexuality. PLWHA, especially women, face challenges related to their sexuality, some of which are not directly related to their illness and treatment. The fear of transmitting drug resistant HIV or getting re-infected, stigma, disclosure issues,difficulties negotiating for safe sex among women, HAART-related lipodystrophic changes that affect one‘s sense of self and unmet reproductive needs are some of the problems that were reported. The men‘s dislike for condoms was overt and blatant. Discussion: Being diagnosed with HIV and reaching a point where treatment is requiredare life-changing events. Making decisions about one‘s life (including adherence to HAART, alcohol use and knowingly partaking in risky sexual encounters) become all the more significant in the context of AIDS. Intentional non-adherence is informed by the individual‘s assessment of the costs and benefits of taking treatment. Cultural influences,gendered power relations and misconceptions strongly influence sexual behaviours. Conclusion: The general lack of attention among health care providers concerning issues related to PLWHA‘s sexuality and reproductive issues needs to be addressed. Insights fromthe theoretical models should be integrated with empirical findings in designing adherence interventions.
- Full Text:
- Authors: Chizanga, Tongai Aldridge
- Date: 2010
- Subjects: AIDS (Disease) -- Treatment -- South Africa -- Grahamstown HIV infections -- Treatment -- South Africa -- Grahamstown Antiretroviral agents -- South Africa -- Grahamstown Patient compliance -- South Africa -- Grahamstown AIDS (Disease) -- Social aspects -- South Africa -- Grahamstown HIV infections -- Social aspects -- South Africa -- Grahamstown AIDS (Disease) -- Patients -- South Africa -- Grahamstown -- Sexual behavior HIV-positive persons -- South Africa -- Grahamstown -- Sexual behavior Patient education -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:3750 , http://hdl.handle.net/10962/d1003228
- Description: Introduction: Adherence to Highly Active Antiretroviral Therapy (HAART) is critical for optimal therapeutic outcomes. A possible factor in adherence is the impact of HAART on sexual functioning. Methods: A mixed methods approach was used. A cohort of 14 people living with HIV/AIDS (PLWHA) in Grahamstown was identified. Two semi-structured interviews and two structured questionnaires were administered. In-depth interviews were conducted with two HIV counsellors in so as to obtain a different perspective on the topics. The theoretical framework used three health behaviour models: the Health Belief Model, Leventhal‘s Common-Sense Model of self regulation and the Transtheoretical model. Results: The participants were between 27 and 49 years old and had been on HAART for between 9 months and 10 years. Six participants were support staff members from Rhodes University and eight from the Raphael Centre – a local NGO which assists PLWHA.In most of the participants HAART was associated with increased libido and improved sexual functioning (sexual activity and sexual enjoyment). The use of alcohol increased risky sexual behaviour. Issues of adherence were seemingly not directly affected by the effects of HAART on sexuality. PLWHA, especially women, face challenges related to their sexuality, some of which are not directly related to their illness and treatment. The fear of transmitting drug resistant HIV or getting re-infected, stigma, disclosure issues,difficulties negotiating for safe sex among women, HAART-related lipodystrophic changes that affect one‘s sense of self and unmet reproductive needs are some of the problems that were reported. The men‘s dislike for condoms was overt and blatant. Discussion: Being diagnosed with HIV and reaching a point where treatment is requiredare life-changing events. Making decisions about one‘s life (including adherence to HAART, alcohol use and knowingly partaking in risky sexual encounters) become all the more significant in the context of AIDS. Intentional non-adherence is informed by the individual‘s assessment of the costs and benefits of taking treatment. Cultural influences,gendered power relations and misconceptions strongly influence sexual behaviours. Conclusion: The general lack of attention among health care providers concerning issues related to PLWHA‘s sexuality and reproductive issues needs to be addressed. Insights fromthe theoretical models should be integrated with empirical findings in designing adherence interventions.
- Full Text:
A standardised protocol for roadkill detection and the determinants of roadkill in the greater Mapungubwe Transfrontier Conservation Area, Limpopo Province, South Africa
- Authors: Collinson, Wendy Jane
- Date: 2013
- Subjects: Roadkill -- South Africa -- Mapungubwe Site , Traffic safety and wildlife -- South Africa -- Mapungubwe Site
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5606 , http://hdl.handle.net/10962/d1002056 , Roadkill -- South Africa -- Mapungubwe Site , Traffic safety and wildlife -- South Africa -- Mapungubwe Site
- Description: Despite evidence suggesting that road traffic is a major threat to biodiversity loss, very little is known about its actual impact on wildlife populations in South Africa. Globally, road density and traffic volumes are increasing, and although huge budgets are devoted to the construction and upgrading of roads, there is little or no allocation to mitigation measures for protecting fauna in most countries, particularly Africa. Further, no global standardised protocol exists for the rapid assessment of roadkill or the most economical and efficient approach for assessing roadkill rates. Using vehicle field trials, the reliability of detecting artificially deployed roadkill was assessed. Roadkill detection rates decreased significantly at speeds >50 km/h and were also significantly influenced by light conditions (i.e. detection success was greater when the sun was high) and the position of the roadkill on the road (i.e. smaller roadkill on verges were often missed). These results suggest that roadkill sampling was most effective between 1.5 hours after dawn and 1.5 hours before dusk and that driving at slower speeds (<50 km.h⁻ₑ) was required to detect roadkill. This protocol was implemented across three ecological seasons on a 100 km paved road and a 20 km unpaved road in the Greater Mapungubwe Transfrontier Conservation Area, Limpopo Province, South Africa. Driven daily over a 120-day period (three periods consisting each of 40 days), a total of 1,027 roadkill were recorded. These comprised 162 species from all terrestrial vertebrate groups with birds being the most commonly encountered roadkill (50% of all incidents). The high numbers of vertebrates identified as roadkill suggests that road traffic could have potentially unsustainable impacts on wildlife populations and hence the biodiversity of the area. Seventeen variables were identified as possible determinants of roadkill occurrence with season, rainfall, minimum and maximum temperature, habitat type, grass height, grass density, fence type and vehicle type significantly influencing roadkill numbers. Significantly more roadkill were detected on the paved road (9.91/100km) than on the unpaved road (1.8/100km) probably because of greater traffic volumes and the increased speed that vehicles travelled on the paved road. Warmer temperatures and increased rainfall in the preceding 24 hours also increased road mortality numbers as animals tended to become more active during these times. Interestingly, more roadkill was detected in open roadside habitats compared to dense roadside habitats on both the paved and unpaved roads and when grass on the roadside verge was of intermediate height. Open habitat possibly may provide a natural corridor for wildlife which ultimately end up on the road. Roadkill numbers increased when certain other physical barriers, such as cattle fences, were present, probably because these barriers were more penetrable than electric fencing. A series of mitigation measures are proposed to reduce the impacts of roads on wildlife in South Africa. These mitigation measures highlight the need to address the balance between the development of a country’s transport infrastructure and the conservation of its fauna. It is important that research on the impacts of roads becomes standardised to enable robust statistical comparisons which will provide a greater understanding of the potential threats to vertebrate biodiversity
- Full Text:
- Authors: Collinson, Wendy Jane
- Date: 2013
- Subjects: Roadkill -- South Africa -- Mapungubwe Site , Traffic safety and wildlife -- South Africa -- Mapungubwe Site
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5606 , http://hdl.handle.net/10962/d1002056 , Roadkill -- South Africa -- Mapungubwe Site , Traffic safety and wildlife -- South Africa -- Mapungubwe Site
- Description: Despite evidence suggesting that road traffic is a major threat to biodiversity loss, very little is known about its actual impact on wildlife populations in South Africa. Globally, road density and traffic volumes are increasing, and although huge budgets are devoted to the construction and upgrading of roads, there is little or no allocation to mitigation measures for protecting fauna in most countries, particularly Africa. Further, no global standardised protocol exists for the rapid assessment of roadkill or the most economical and efficient approach for assessing roadkill rates. Using vehicle field trials, the reliability of detecting artificially deployed roadkill was assessed. Roadkill detection rates decreased significantly at speeds >50 km/h and were also significantly influenced by light conditions (i.e. detection success was greater when the sun was high) and the position of the roadkill on the road (i.e. smaller roadkill on verges were often missed). These results suggest that roadkill sampling was most effective between 1.5 hours after dawn and 1.5 hours before dusk and that driving at slower speeds (<50 km.h⁻ₑ) was required to detect roadkill. This protocol was implemented across three ecological seasons on a 100 km paved road and a 20 km unpaved road in the Greater Mapungubwe Transfrontier Conservation Area, Limpopo Province, South Africa. Driven daily over a 120-day period (three periods consisting each of 40 days), a total of 1,027 roadkill were recorded. These comprised 162 species from all terrestrial vertebrate groups with birds being the most commonly encountered roadkill (50% of all incidents). The high numbers of vertebrates identified as roadkill suggests that road traffic could have potentially unsustainable impacts on wildlife populations and hence the biodiversity of the area. Seventeen variables were identified as possible determinants of roadkill occurrence with season, rainfall, minimum and maximum temperature, habitat type, grass height, grass density, fence type and vehicle type significantly influencing roadkill numbers. Significantly more roadkill were detected on the paved road (9.91/100km) than on the unpaved road (1.8/100km) probably because of greater traffic volumes and the increased speed that vehicles travelled on the paved road. Warmer temperatures and increased rainfall in the preceding 24 hours also increased road mortality numbers as animals tended to become more active during these times. Interestingly, more roadkill was detected in open roadside habitats compared to dense roadside habitats on both the paved and unpaved roads and when grass on the roadside verge was of intermediate height. Open habitat possibly may provide a natural corridor for wildlife which ultimately end up on the road. Roadkill numbers increased when certain other physical barriers, such as cattle fences, were present, probably because these barriers were more penetrable than electric fencing. A series of mitigation measures are proposed to reduce the impacts of roads on wildlife in South Africa. These mitigation measures highlight the need to address the balance between the development of a country’s transport infrastructure and the conservation of its fauna. It is important that research on the impacts of roads becomes standardised to enable robust statistical comparisons which will provide a greater understanding of the potential threats to vertebrate biodiversity
- Full Text:
The archetypal fable : an inquiry into the function of traditional symbolism in the poetry of Edwin Muir
- Authors: Gillmer, J E
- Date: 1970
- Subjects: Muir, Edwin, 1887-1959 -- Criticism and interpretation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2297 , http://hdl.handle.net/10962/d1011975
- Description: Edwin Muir's poetic vision is bound up with that belief in a twofold structure of reality that in European culture has been called Platonist but which is so ancient and widespread that no one can determine its origins. Though no longer fashionable in a time when materialist philosophies flourish and even Christian clerics are busy "de-mythologizing" their faith, it has been the potent source of our greatest poetry and perhaps, as Kathleen Raine believes, of all true poetry. Those who hold this conviction regard the sensible world as the reflection of an "intelligible" or spiritual world which gives meaning and purpose to life, and they see the objects of nature as images that evoke the ideal forms of a divine reality. For poets, as for traditional men, this belief is less a metaphysic than an intuitive way of apprehending and ordering experience, a "learning of the imagination" inherited from ancient and mysterious sources. To Muir it came directly and spontaneously in the symbolic images of dreams, and the fact that he entitled the first version of his autobiography The Story and the Fable testifies to the importance, both for his life and his poetry, of his belief in two corresponding orders of experience. Intro., p. 1-2.
- Full Text:
- Authors: Gillmer, J E
- Date: 1970
- Subjects: Muir, Edwin, 1887-1959 -- Criticism and interpretation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2297 , http://hdl.handle.net/10962/d1011975
- Description: Edwin Muir's poetic vision is bound up with that belief in a twofold structure of reality that in European culture has been called Platonist but which is so ancient and widespread that no one can determine its origins. Though no longer fashionable in a time when materialist philosophies flourish and even Christian clerics are busy "de-mythologizing" their faith, it has been the potent source of our greatest poetry and perhaps, as Kathleen Raine believes, of all true poetry. Those who hold this conviction regard the sensible world as the reflection of an "intelligible" or spiritual world which gives meaning and purpose to life, and they see the objects of nature as images that evoke the ideal forms of a divine reality. For poets, as for traditional men, this belief is less a metaphysic than an intuitive way of apprehending and ordering experience, a "learning of the imagination" inherited from ancient and mysterious sources. To Muir it came directly and spontaneously in the symbolic images of dreams, and the fact that he entitled the first version of his autobiography The Story and the Fable testifies to the importance, both for his life and his poetry, of his belief in two corresponding orders of experience. Intro., p. 1-2.
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The role of training and organizational support in strengthening GIS interns’ (‘incubants’) participation in workplace occupations: a case study of the Groen Sebenza internship project
- Authors: Madiba, Morakane
- Date: 2016
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/1330 , vital:20047
- Description: The cases in this study are embedded within a multi-layered, nested case study design. An in-depth exploration of each case is provided with a view to understand the ways in which the internship training in the incubation model strengthens the learning, experience, knowledge, skills and interest of the university graduate interns/incubants to prepare them for full participation in their communities of practice in workplaces. The case study of Groen Sebenza internship project works across more than 40 partnering organisations. It is using incubation model for the first time in the biodiversity sector which is why its training needs to be investigated. To examine this question “In what way can training and the organizational support, of the incubation model strengthen the learning, experience, knowledge, skills and interest of interns/incubants to prepare them towards full participation in workplace roles and responsibilities in biodiversity occupations?” the research was undertaken in the context of university graduate incubants/interns in the Geographic Information System (GIS) field from three host-organizations; Limpopo Economic Development Environment and Tourism (LEDET), Environmental Systems Research Institute (ESRI) and South African National Biodiversity Institute (SANBI). The participants of the study were purposefully selected. Data was collected twice (i.e. after the first seven months and then a follow-up interview was conducted after a further five months) during the first twelve months of the project in the form of interviews and observations. There was also ongoing data collected in the form of documents which focused on their participation in workplaces and training. Data was analysed using different layers of qualitative content analysis and examination of documents at different stages of the study. Through immersion with the data and literature insights were developed regarding the enablers and constraints of the training in the incubation model related to the GIS interns. These included:- 1. The twelve months period spent by the GIS incubants in the Groen Sebenza internship project was not enough to prepare them towards full participation in workplace roles and responsibilities in biodiversity occupations. 2. Internship training is not just a ‘passing insignificant episode of the lives of the incubants/newcomers’ [specifically those from disadvantaged communities] but is a ‘real source of hope’. 3. The investigated institutions (and their members) need to make a real effort to improve if they want to stay relevant and useful in the Groen Sebenza internship project. 4. The incubants and mentors need to make the process of reflexivity real and practical. 5. The 2.5 years incubation model has high potential to work if the institutions, the mentors and the mentees involved in GIS improve the challenges mentioned in the study. Drawing from the data and literature I have discussed and recommended a model which could assist in improving the internship programmes specifically for the university students who are from underprivileged communities.
- Full Text:
- Authors: Madiba, Morakane
- Date: 2016
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/1330 , vital:20047
- Description: The cases in this study are embedded within a multi-layered, nested case study design. An in-depth exploration of each case is provided with a view to understand the ways in which the internship training in the incubation model strengthens the learning, experience, knowledge, skills and interest of the university graduate interns/incubants to prepare them for full participation in their communities of practice in workplaces. The case study of Groen Sebenza internship project works across more than 40 partnering organisations. It is using incubation model for the first time in the biodiversity sector which is why its training needs to be investigated. To examine this question “In what way can training and the organizational support, of the incubation model strengthen the learning, experience, knowledge, skills and interest of interns/incubants to prepare them towards full participation in workplace roles and responsibilities in biodiversity occupations?” the research was undertaken in the context of university graduate incubants/interns in the Geographic Information System (GIS) field from three host-organizations; Limpopo Economic Development Environment and Tourism (LEDET), Environmental Systems Research Institute (ESRI) and South African National Biodiversity Institute (SANBI). The participants of the study were purposefully selected. Data was collected twice (i.e. after the first seven months and then a follow-up interview was conducted after a further five months) during the first twelve months of the project in the form of interviews and observations. There was also ongoing data collected in the form of documents which focused on their participation in workplaces and training. Data was analysed using different layers of qualitative content analysis and examination of documents at different stages of the study. Through immersion with the data and literature insights were developed regarding the enablers and constraints of the training in the incubation model related to the GIS interns. These included:- 1. The twelve months period spent by the GIS incubants in the Groen Sebenza internship project was not enough to prepare them towards full participation in workplace roles and responsibilities in biodiversity occupations. 2. Internship training is not just a ‘passing insignificant episode of the lives of the incubants/newcomers’ [specifically those from disadvantaged communities] but is a ‘real source of hope’. 3. The investigated institutions (and their members) need to make a real effort to improve if they want to stay relevant and useful in the Groen Sebenza internship project. 4. The incubants and mentors need to make the process of reflexivity real and practical. 5. The 2.5 years incubation model has high potential to work if the institutions, the mentors and the mentees involved in GIS improve the challenges mentioned in the study. Drawing from the data and literature I have discussed and recommended a model which could assist in improving the internship programmes specifically for the university students who are from underprivileged communities.
- Full Text:
The role of the mite Orthogalumna terebrantis in the biological control programme for water hyacinth, Eichhornia crassipes, in South Africa
- Authors: Marlin, Danica
- Date: 2011
- Subjects: Water hyacinth -- Biological control -- South Africa Aquatic weeds -- South Africa Invasive plants -- South Africa Mites -- South Africa Mites as biological pest control agents -- South Africa Biological pest control agents -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5762 , http://hdl.handle.net/10962/d1005450
- Description: Water hyacinth (Eichhornia crassipes) is an aquatic macrophyte originating from the Amazon basin. Due to its beautiful appearance it has been introduced into numerous countries across the world as an ornamental pond plant. It was introduced into South Africa in the early 1900s and has since reached pest proportions in many of the country’s fresh water bodies, causing significant economic and ecological losses. It is now considered to be the worst aquatic weed in South Africa. Efforts to control the spread of the weed began in the early 1970s and there have been some successes. Biological control has been used widely as an alternative to mechanical and chemical controls because it is cost-effective, self-sustaining and environmentally friendly. To date, six biological control agents have been introduced onto water hyacinth in South Africa. However, due to factors such as cold winter temperatures and interference from chemical control, the agent populations are occasionally knocked-down and thus the impact of biological control on the weed population is variable. In addition, many South African water systems are highly eutrophic, and in these systems the plant growth may be accelerated to such an extent that the negative impact of the agents’ herbivory is mitigated. One of the agents established on the weed is the galumnid mite Orthogalumna terebrantis, which originates from Uruguay. In South Africa, the mite was initially discovered on two water hyacinth infestations in the Mpumalanga Province in 1989 and it is now established at 17 sites across the country. Many biological control researchers believe that the mite is a good biological control agent but, prior to this thesis, little quantitative data existed to confirm the belief. Thus, this thesis is a post-release evaluation of O. terebrantis in which various aspects of the mite-plant relationship were investigated to determine the efficacy of the mite and thus better understand the role of the mite in the biological control programme of water hyacinth in South Africa. From laboratory experiments, in which mite densities were lower than densities occurring in the field, it was found that water hyacinth growth is largely unaffected by mite herbivory, except possibly at very high mite densities. When grown in high nutrient conditions the growth of the plant is so great that any affect the mite has is nullified. Plant growth is thus more affected by nutrients than by mite herbivory. However, mite feeding was also influenced by water nutrient levels and mite herbivory was greatest on plants grown in high nutrient conditions. The presence of the mite had a positive effect on the performance of the mirid Eccritotarsus catarinensis, such that the interactions of the two agents together had a greater negative impact on the plant’s growth than the individual agents had alone. Furthermore, water hyacinth physiological parameters, such as the plant’s photosynthetic ability, were negatively impacted by the mite, even at the very low mite densities used in the study. Plant growth rate is dependent on photosynthetic ability i.e. the rate of photosynthesis, and thus a decrease in the plant’s photosynthetic ability will eventually be translated into decreased plant growth rates which would ultimately result in the overall reduction of water hyacinth populations. In addition, temperature tolerance studies showed that the mite was tolerant of low temperatures. The mite already occurs at some of the coldest sites in South Africa. Therefore, the mite should be able to establish at all of the water hyacinth infestations in the country, but because it is a poor disperser it is unlikely to establish at new sites without human intervention. It is suggested that the mite be used as an additional biological control agent at sites where it does not yet occur, specifically at cold sites where some of the other, less cold-tolerant, agents have failed to establish. Finally, conditions of where, how many and how often the mite should be distributed to water hyacinth infestation in South Africa are discussed.
- Full Text:
- Authors: Marlin, Danica
- Date: 2011
- Subjects: Water hyacinth -- Biological control -- South Africa Aquatic weeds -- South Africa Invasive plants -- South Africa Mites -- South Africa Mites as biological pest control agents -- South Africa Biological pest control agents -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5762 , http://hdl.handle.net/10962/d1005450
- Description: Water hyacinth (Eichhornia crassipes) is an aquatic macrophyte originating from the Amazon basin. Due to its beautiful appearance it has been introduced into numerous countries across the world as an ornamental pond plant. It was introduced into South Africa in the early 1900s and has since reached pest proportions in many of the country’s fresh water bodies, causing significant economic and ecological losses. It is now considered to be the worst aquatic weed in South Africa. Efforts to control the spread of the weed began in the early 1970s and there have been some successes. Biological control has been used widely as an alternative to mechanical and chemical controls because it is cost-effective, self-sustaining and environmentally friendly. To date, six biological control agents have been introduced onto water hyacinth in South Africa. However, due to factors such as cold winter temperatures and interference from chemical control, the agent populations are occasionally knocked-down and thus the impact of biological control on the weed population is variable. In addition, many South African water systems are highly eutrophic, and in these systems the plant growth may be accelerated to such an extent that the negative impact of the agents’ herbivory is mitigated. One of the agents established on the weed is the galumnid mite Orthogalumna terebrantis, which originates from Uruguay. In South Africa, the mite was initially discovered on two water hyacinth infestations in the Mpumalanga Province in 1989 and it is now established at 17 sites across the country. Many biological control researchers believe that the mite is a good biological control agent but, prior to this thesis, little quantitative data existed to confirm the belief. Thus, this thesis is a post-release evaluation of O. terebrantis in which various aspects of the mite-plant relationship were investigated to determine the efficacy of the mite and thus better understand the role of the mite in the biological control programme of water hyacinth in South Africa. From laboratory experiments, in which mite densities were lower than densities occurring in the field, it was found that water hyacinth growth is largely unaffected by mite herbivory, except possibly at very high mite densities. When grown in high nutrient conditions the growth of the plant is so great that any affect the mite has is nullified. Plant growth is thus more affected by nutrients than by mite herbivory. However, mite feeding was also influenced by water nutrient levels and mite herbivory was greatest on plants grown in high nutrient conditions. The presence of the mite had a positive effect on the performance of the mirid Eccritotarsus catarinensis, such that the interactions of the two agents together had a greater negative impact on the plant’s growth than the individual agents had alone. Furthermore, water hyacinth physiological parameters, such as the plant’s photosynthetic ability, were negatively impacted by the mite, even at the very low mite densities used in the study. Plant growth rate is dependent on photosynthetic ability i.e. the rate of photosynthesis, and thus a decrease in the plant’s photosynthetic ability will eventually be translated into decreased plant growth rates which would ultimately result in the overall reduction of water hyacinth populations. In addition, temperature tolerance studies showed that the mite was tolerant of low temperatures. The mite already occurs at some of the coldest sites in South Africa. Therefore, the mite should be able to establish at all of the water hyacinth infestations in the country, but because it is a poor disperser it is unlikely to establish at new sites without human intervention. It is suggested that the mite be used as an additional biological control agent at sites where it does not yet occur, specifically at cold sites where some of the other, less cold-tolerant, agents have failed to establish. Finally, conditions of where, how many and how often the mite should be distributed to water hyacinth infestation in South Africa are discussed.
- Full Text:
The "Big E": the English (first language) endorsement on the teacher's bilingualism certificate: an investigation into the background to and origin of this requirement, an evaluation of past and current examining practices and standards and criteria, a needs assessment, and suggestions and recommendations for sound practice
- Authors: Spingies, Conrad
- Date: 1992
- Subjects: Teachers -- Training of -- South Africa Teachers -- Selection and appointment Teachers -- Language Teachers -- Certification -- South Africa Bilingualism -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1427 , http://hdl.handle.net/10962/d1003308
- Description: South African education authorities demand of teachers a high degree of competency in both official languages. In the Cape Province in particular, teachers are not considered eligible for promotion posts unless they possess the so-called Higher Bilingualism Certificate, signifying their command of both official languages at "First Language" level. In view of the fact that the overwhelming majority of schools nowadays are single-medium institutions; this requirement may strike the objective observer as an anomaly. An attempt was made, therefore, first of all to investigate the historical background to this requirement. The "language question", a problematic feature of South African education since the beginning of the nineteenth.century, was not resolved when legislators chose "bilingualism and language equality" for the Union of South Africa in 1910. The available evidence suggests, however, that bilingualism was actively pursued as an educational ideal at least until the end of the 1940s, and for this reason education authorities placed a high premium on teachers who were "fully bilingual". Nowadays the typical (White) school is a single-medium institution where the second language is rarely if ever heard outside the classroom where it is taught as a subject. The present policy, to demand a high degree of proficiency in both official languages of teachers occupying promotion posts at such a school, may then be described not only as an anomaly, but as an anachronism. A further problem is the fact that the various educational institutions (specifically teachers' colleges and universities) that set examinations leading to the Higher Bilingualism Certificate rarely communicate with one another, and are therefore unable to agree on uniform standards and criteria, or to ensure that such standards are maintained. That this is indeed the case, was confirmed by examination of "Big E" test papers set at three teachers' colleges, two Colleges for Continued Training, and four universities in the Cape Province. In an attempt to establish what assistance and support might be needed by a "second language" user of English in order for him to improve to the point where he resembled a "first language" user of English in his "terminal language behaviour", a comparison (by means of error analysis) of the responses of two groups (an Ll and an L2 group) to the same test paper was undertaken. The available evidence suggests that L2 users may need to be helped to acquire a more extensive vocabulary, but, above all, that they need to improve their ability to handle two crucially important aspects of usage: idiom and grammar. The final chapter attempts to establish pedagogic and linguistic bases for a course intended for "Big E" candidates, and makes recommendations with regard to (i) the content and the form of the course, and (ii) sound examination practice. The concluding thoughts offer the view that such a course could remain useful even in a future South Africa where the emphasis may shift from a demand for teachers who are "fully bilingual" to teachers who have a good command of English.
- Full Text:
- Authors: Spingies, Conrad
- Date: 1992
- Subjects: Teachers -- Training of -- South Africa Teachers -- Selection and appointment Teachers -- Language Teachers -- Certification -- South Africa Bilingualism -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1427 , http://hdl.handle.net/10962/d1003308
- Description: South African education authorities demand of teachers a high degree of competency in both official languages. In the Cape Province in particular, teachers are not considered eligible for promotion posts unless they possess the so-called Higher Bilingualism Certificate, signifying their command of both official languages at "First Language" level. In view of the fact that the overwhelming majority of schools nowadays are single-medium institutions; this requirement may strike the objective observer as an anomaly. An attempt was made, therefore, first of all to investigate the historical background to this requirement. The "language question", a problematic feature of South African education since the beginning of the nineteenth.century, was not resolved when legislators chose "bilingualism and language equality" for the Union of South Africa in 1910. The available evidence suggests, however, that bilingualism was actively pursued as an educational ideal at least until the end of the 1940s, and for this reason education authorities placed a high premium on teachers who were "fully bilingual". Nowadays the typical (White) school is a single-medium institution where the second language is rarely if ever heard outside the classroom where it is taught as a subject. The present policy, to demand a high degree of proficiency in both official languages of teachers occupying promotion posts at such a school, may then be described not only as an anomaly, but as an anachronism. A further problem is the fact that the various educational institutions (specifically teachers' colleges and universities) that set examinations leading to the Higher Bilingualism Certificate rarely communicate with one another, and are therefore unable to agree on uniform standards and criteria, or to ensure that such standards are maintained. That this is indeed the case, was confirmed by examination of "Big E" test papers set at three teachers' colleges, two Colleges for Continued Training, and four universities in the Cape Province. In an attempt to establish what assistance and support might be needed by a "second language" user of English in order for him to improve to the point where he resembled a "first language" user of English in his "terminal language behaviour", a comparison (by means of error analysis) of the responses of two groups (an Ll and an L2 group) to the same test paper was undertaken. The available evidence suggests that L2 users may need to be helped to acquire a more extensive vocabulary, but, above all, that they need to improve their ability to handle two crucially important aspects of usage: idiom and grammar. The final chapter attempts to establish pedagogic and linguistic bases for a course intended for "Big E" candidates, and makes recommendations with regard to (i) the content and the form of the course, and (ii) sound examination practice. The concluding thoughts offer the view that such a course could remain useful even in a future South Africa where the emphasis may shift from a demand for teachers who are "fully bilingual" to teachers who have a good command of English.
- Full Text:
Investigating tools and techniques for improving software performance on multiprocessor computer systems
- Authors: Tristram, Waide Barrington
- Date: 2012
- Subjects: Multiprocessors , Multiprogramming (Electronic computers) , Parallel programming (Computer science) , Linux , Abstract data types (Computer science) , Threads (Computer programs) , Computer programming
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4655 , http://hdl.handle.net/10962/d1006651 , Multiprocessors , Multiprogramming (Electronic computers) , Parallel programming (Computer science) , Linux , Abstract data types (Computer science) , Threads (Computer programs) , Computer programming
- Description: The availability of modern commodity multicore processors and multiprocessor computer systems has resulted in the widespread adoption of parallel computers in a variety of environments, ranging from the home to workstation and server environments in particular. Unfortunately, parallel programming is harder and requires more expertise than the traditional sequential programming model. The variety of tools and parallel programming models available to the programmer further complicates the issue. The primary goal of this research was to identify and describe a selection of parallel programming tools and techniques to aid novice parallel programmers in the process of developing efficient parallel C/C++ programs for the Linux platform. This was achieved by highlighting and describing the key concepts and hardware factors that affect parallel programming, providing a brief survey of commonly available software development tools and parallel programming models and libraries, and presenting structured approaches to software performance tuning and parallel programming. Finally, the performance of several parallel programming models and libraries was investigated, along with the programming effort required to implement solutions using the respective models. A quantitative research methodology was applied to the investigation of the performance and programming effort associated with the selected parallel programming models and libraries, which included automatic parallelisation by the compiler, Boost Threads, Cilk Plus, OpenMP, POSIX threads (Pthreads), and Threading Building Blocks (TBB). Additionally, the performance of the GNU C/C++ and Intel C/C++ compilers was examined. The results revealed that the choice of parallel programming model or library is dependent on the type of problem being solved and that there is no overall best choice for all classes of problem. However, the results also indicate that parallel programming models with higher levels of abstraction require less programming effort and provide similar performance compared to explicit threading models. The principle conclusion was that the problem analysis and parallel design are an important factor in the selection of the parallel programming model and tools, but that models with higher levels of abstractions, such as OpenMP and Threading Building Blocks, are favoured.
- Full Text:
- Authors: Tristram, Waide Barrington
- Date: 2012
- Subjects: Multiprocessors , Multiprogramming (Electronic computers) , Parallel programming (Computer science) , Linux , Abstract data types (Computer science) , Threads (Computer programs) , Computer programming
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4655 , http://hdl.handle.net/10962/d1006651 , Multiprocessors , Multiprogramming (Electronic computers) , Parallel programming (Computer science) , Linux , Abstract data types (Computer science) , Threads (Computer programs) , Computer programming
- Description: The availability of modern commodity multicore processors and multiprocessor computer systems has resulted in the widespread adoption of parallel computers in a variety of environments, ranging from the home to workstation and server environments in particular. Unfortunately, parallel programming is harder and requires more expertise than the traditional sequential programming model. The variety of tools and parallel programming models available to the programmer further complicates the issue. The primary goal of this research was to identify and describe a selection of parallel programming tools and techniques to aid novice parallel programmers in the process of developing efficient parallel C/C++ programs for the Linux platform. This was achieved by highlighting and describing the key concepts and hardware factors that affect parallel programming, providing a brief survey of commonly available software development tools and parallel programming models and libraries, and presenting structured approaches to software performance tuning and parallel programming. Finally, the performance of several parallel programming models and libraries was investigated, along with the programming effort required to implement solutions using the respective models. A quantitative research methodology was applied to the investigation of the performance and programming effort associated with the selected parallel programming models and libraries, which included automatic parallelisation by the compiler, Boost Threads, Cilk Plus, OpenMP, POSIX threads (Pthreads), and Threading Building Blocks (TBB). Additionally, the performance of the GNU C/C++ and Intel C/C++ compilers was examined. The results revealed that the choice of parallel programming model or library is dependent on the type of problem being solved and that there is no overall best choice for all classes of problem. However, the results also indicate that parallel programming models with higher levels of abstraction require less programming effort and provide similar performance compared to explicit threading models. The principle conclusion was that the problem analysis and parallel design are an important factor in the selection of the parallel programming model and tools, but that models with higher levels of abstractions, such as OpenMP and Threading Building Blocks, are favoured.
- Full Text:
A critical examination of the policy and practice of the Methodist Church of Southern Africa regarding the readmission of ministers who have resigned or who have been discontinued as a result of divorce
- Authors: Van Niekerk, Ockert
- Date: 1999
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:21093 , http://hdl.handle.net/10962/6356
- Description: The scope and purpose of this research is the examination of the theology and practice of the Methodist Church of Southern Africa in matters relating to marriage, divorce and remarriage in ministry. The theology of the Methodist Church of Southern Africa is based on its understanding of the scriptural injunctions on these matters and the Wesleyan tradition. These are examined in some detail as is the one paper in existence produced by the church on the subject. This is the report by a committee appointed by the Conference of the Methodist Church of Southern Africa, convened by Dr Donald Cragg; M.A. (OX ON) D.Phil. (OXON). This document is referred to in this thesis as The Cragg Document. Section One of this thesis deals with research into the theology of the church. The practice of the church is examined using the recently completed study by the writer of the decided cases of the church in all disciplinary matters dealt with by Conference from 1957 to 1997. These were compiled from the existing record of Conference proceedings kept in the Methodist Connexional Office in Durban. This case precedent is included in a larger work also recently completed by the writer, namely A Handbook/or Disciplinary Committees. This book is in the process of being published by the church. Section two of this work deals with research into the practice of the church. The conclusions drawn at the end of this paper include a possible model for ministry to ministers and their families in the area of marriage and family enrichment and pastoral assistance to families in crisis. This thesis includes qualitative research into the aforesaid practice and procedure of the church in these matters and it is submitted that the conclusions drawn and the model posed in the concluding chapters can be of value to the church as it seeks to deal of the problem of an increasing number of ministers suffering the breakup of their homes and going through the trauma of divorce.
- Full Text:
- Authors: Van Niekerk, Ockert
- Date: 1999
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:21093 , http://hdl.handle.net/10962/6356
- Description: The scope and purpose of this research is the examination of the theology and practice of the Methodist Church of Southern Africa in matters relating to marriage, divorce and remarriage in ministry. The theology of the Methodist Church of Southern Africa is based on its understanding of the scriptural injunctions on these matters and the Wesleyan tradition. These are examined in some detail as is the one paper in existence produced by the church on the subject. This is the report by a committee appointed by the Conference of the Methodist Church of Southern Africa, convened by Dr Donald Cragg; M.A. (OX ON) D.Phil. (OXON). This document is referred to in this thesis as The Cragg Document. Section One of this thesis deals with research into the theology of the church. The practice of the church is examined using the recently completed study by the writer of the decided cases of the church in all disciplinary matters dealt with by Conference from 1957 to 1997. These were compiled from the existing record of Conference proceedings kept in the Methodist Connexional Office in Durban. This case precedent is included in a larger work also recently completed by the writer, namely A Handbook/or Disciplinary Committees. This book is in the process of being published by the church. Section two of this work deals with research into the practice of the church. The conclusions drawn at the end of this paper include a possible model for ministry to ministers and their families in the area of marriage and family enrichment and pastoral assistance to families in crisis. This thesis includes qualitative research into the aforesaid practice and procedure of the church in these matters and it is submitted that the conclusions drawn and the model posed in the concluding chapters can be of value to the church as it seeks to deal of the problem of an increasing number of ministers suffering the breakup of their homes and going through the trauma of divorce.
- Full Text:
Indigenous technology and culture in the technology curriculum : starting the conversation : a case study
- Authors: Vandeleur, Sonja
- Date: 2010
- Subjects: Curriculum evaluation -- South Africa Curriculum planning -- South Africa Education -- Curricula -- South Africa Technology -- Study and teaching -- South Africa Indigenous peoples -- Education -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1573 , http://hdl.handle.net/10962/d1003455
- Description: Since the collapse of apartheid and the first democratic elections of 1994, education in South Africa has undergone fundamental transformation and part of this transformation was the reconstruction of the school curriculum. The new curriculum, known as Curriculum 2005 and developed in 1997, introduced Technology as a new learning area. This study is based on the inclusion of ‘indigenous technology and culture’, a new aspect introduced in a revision of Curriculum 2005. The broad goal of the study was to examine and explore pedagogic practice in relation to the inclusion of ‘indigenous technology and culture’ in the revised National Curriculum Statement for Technology. The study was informed by an examination of literature pertaining to philosophy of technology, indigenous knowledge systems and technology education. The review of the literature highlighted the contested nature of ‘indigenous knowledge systems’. Philosophies on the nature of technological knowledge were reviewed in order to explore the meaning of ‘technology’, and a comparative review of curriculum reform in regard to technology education in various parts of the world was conducted. This study presented an attempt to determine the rationale for the inclusion of ‘indigenous technology and culture’ in the revised National Curriculum Statement for Technology in South Africa and to explore and examine what teachers’ existing practices were in this regard. It also examined a process of participatory co-engagement with a focus group of teachers. This process was an attempt to implement ‘indigenous technology and culture’ of the curriculum in a more meaningful way. A case study approach using an in-depth, interpretive design was used. A questionnaire, document analysis, interviews and focus group discussions were used to conduct the investigation. What emerged from the data analysis was that there was unanimous support for the inclusion of ‘indigenous technology and culture’ in the technology curriculum, but implementation had been problematic. This was partly due to difficulties with the interpretation of this aspect in the curriculum as well as a lack of meaningful teaching and learning for various reasons. The study revealed that teachers face multiple dilemmas in implementing ‘indigenous technology and culture’ as an assessment standard. These dilemmas are pedagogical, political, conceptual, professional and cultural in nature. The intentions of the study were to build a comprehensive understanding of ‘indigenous technology and culture’ and to determine how a focus group of teachers were dealing with this new inclusion. The interpretive study concluded with implications and recommendations for further studies.
- Full Text:
- Authors: Vandeleur, Sonja
- Date: 2010
- Subjects: Curriculum evaluation -- South Africa Curriculum planning -- South Africa Education -- Curricula -- South Africa Technology -- Study and teaching -- South Africa Indigenous peoples -- Education -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1573 , http://hdl.handle.net/10962/d1003455
- Description: Since the collapse of apartheid and the first democratic elections of 1994, education in South Africa has undergone fundamental transformation and part of this transformation was the reconstruction of the school curriculum. The new curriculum, known as Curriculum 2005 and developed in 1997, introduced Technology as a new learning area. This study is based on the inclusion of ‘indigenous technology and culture’, a new aspect introduced in a revision of Curriculum 2005. The broad goal of the study was to examine and explore pedagogic practice in relation to the inclusion of ‘indigenous technology and culture’ in the revised National Curriculum Statement for Technology. The study was informed by an examination of literature pertaining to philosophy of technology, indigenous knowledge systems and technology education. The review of the literature highlighted the contested nature of ‘indigenous knowledge systems’. Philosophies on the nature of technological knowledge were reviewed in order to explore the meaning of ‘technology’, and a comparative review of curriculum reform in regard to technology education in various parts of the world was conducted. This study presented an attempt to determine the rationale for the inclusion of ‘indigenous technology and culture’ in the revised National Curriculum Statement for Technology in South Africa and to explore and examine what teachers’ existing practices were in this regard. It also examined a process of participatory co-engagement with a focus group of teachers. This process was an attempt to implement ‘indigenous technology and culture’ of the curriculum in a more meaningful way. A case study approach using an in-depth, interpretive design was used. A questionnaire, document analysis, interviews and focus group discussions were used to conduct the investigation. What emerged from the data analysis was that there was unanimous support for the inclusion of ‘indigenous technology and culture’ in the technology curriculum, but implementation had been problematic. This was partly due to difficulties with the interpretation of this aspect in the curriculum as well as a lack of meaningful teaching and learning for various reasons. The study revealed that teachers face multiple dilemmas in implementing ‘indigenous technology and culture’ as an assessment standard. These dilemmas are pedagogical, political, conceptual, professional and cultural in nature. The intentions of the study were to build a comprehensive understanding of ‘indigenous technology and culture’ and to determine how a focus group of teachers were dealing with this new inclusion. The interpretive study concluded with implications and recommendations for further studies.
- Full Text:
The ecology of the red-billed quelea Quelea Quelea (Linnaeus) and other granivorous birds at Eastern Cape feedlots
- Whittington-Jones, Craig Alun
- Authors: Whittington-Jones, Craig Alun
- Date: 2002
- Subjects: Quelea quelea -- South Africa -- Eastern Cape Granivores -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5618 , http://hdl.handle.net/10962/d1003286
- Description: Red-billed Quelea Quelea quelea have expanded their range in the Eastern Cape and now occur throughout the year in new areas. Recent changes in agricultural practice have probably been a contributing factor as flocks are larger than previously recorded and were more often associated with artificial food sources than natural grasses. Ringing and census data indicate that quelea have reduced movements during the non-breeding season and may display strong fidelity (over successive years) to dry season quarters with reliable food supplies. Although the recapture/recovery rate for quelea in the Eastern Cape (1.0-2.5%) was higher than the national average, it was still lower than expected and there may be considerable movement between nearby feeding sites. Some quelea breed locally, but most disperse during summer and their numbers at the feedlots were generally highest in winter and spring. The breeding season of quelea is later than other ploceids in the region and post-nuptial moult overlaps with winter. Replacement of primary wing feathers is relatively slow (124 days), and this is considered an adaptation to minimise disruption of flight capabilities and insulation. Significantly more quelea in the Eastern Cape have breeding plumage suffused with pink than in other southern African populations. However, during the non-breeding season there is apparently considerable intermixing between local populations and those from further north and the existence of a local sub-species is not supported. Seeds of two grass species, Echinochloa sp. and Urochloa panicoides, and two weed species, Amaranthus sp. and Chenopodium sp., were important in the diet of both quelea and Laughing Doves Streptopelia senegalensis. Maize comprised a large proportion of the diet of these species and losses at one ostrich feedlot were estimated at over R 17 000 in two years. Dependence on artificial food sources was generally greatest in winter and spring, but economically significant damage was not confined to this period. Alpha-chloralose showed good potential for reducing numbers of problem birds at livestock feedlots. However, the dynamic nature of problem bird populations favours a non-lethal management approach. Reduction of feed loss through manipulation of the ostrich ration could provide a relatively cheap and effective alternative to lethal control if applied appropriately.
- Full Text:
- Authors: Whittington-Jones, Craig Alun
- Date: 2002
- Subjects: Quelea quelea -- South Africa -- Eastern Cape Granivores -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5618 , http://hdl.handle.net/10962/d1003286
- Description: Red-billed Quelea Quelea quelea have expanded their range in the Eastern Cape and now occur throughout the year in new areas. Recent changes in agricultural practice have probably been a contributing factor as flocks are larger than previously recorded and were more often associated with artificial food sources than natural grasses. Ringing and census data indicate that quelea have reduced movements during the non-breeding season and may display strong fidelity (over successive years) to dry season quarters with reliable food supplies. Although the recapture/recovery rate for quelea in the Eastern Cape (1.0-2.5%) was higher than the national average, it was still lower than expected and there may be considerable movement between nearby feeding sites. Some quelea breed locally, but most disperse during summer and their numbers at the feedlots were generally highest in winter and spring. The breeding season of quelea is later than other ploceids in the region and post-nuptial moult overlaps with winter. Replacement of primary wing feathers is relatively slow (124 days), and this is considered an adaptation to minimise disruption of flight capabilities and insulation. Significantly more quelea in the Eastern Cape have breeding plumage suffused with pink than in other southern African populations. However, during the non-breeding season there is apparently considerable intermixing between local populations and those from further north and the existence of a local sub-species is not supported. Seeds of two grass species, Echinochloa sp. and Urochloa panicoides, and two weed species, Amaranthus sp. and Chenopodium sp., were important in the diet of both quelea and Laughing Doves Streptopelia senegalensis. Maize comprised a large proportion of the diet of these species and losses at one ostrich feedlot were estimated at over R 17 000 in two years. Dependence on artificial food sources was generally greatest in winter and spring, but economically significant damage was not confined to this period. Alpha-chloralose showed good potential for reducing numbers of problem birds at livestock feedlots. However, the dynamic nature of problem bird populations favours a non-lethal management approach. Reduction of feed loss through manipulation of the ostrich ration could provide a relatively cheap and effective alternative to lethal control if applied appropriately.
- Full Text:
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