Shrub and bird community response to fire in dune thicket of the southeastern Cape, South Africa
- Authors: Strydom, Tiaan
- Date: 2020
- Subjects: Fire prevention -- Research -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47635 , vital:40260
- Description: Fire studies within the Cape Floristic Region (CFR) are restricted to the impacts of fire on plants and birds in fire-prone fynbos while little is known about post-fire responses of shrubs and birds in fire-avoiding subtropical dune thicket, which coexists with fynbos but burns on much longer cycles. Fire is deemed important for maintaining the boundaries between fynbos and thicket. It has been hypothesised that high-intensity fires prevent fire-dependent fynbos from being replaced by fireavoiding subtropical thicket (hereafter thicket) on dune landscapes of the CFR. I posit that (1) fire-related thicket shrub mortality would be size dependent, with smaller individuals suffering higher mortality than larger ones; and (2) that survival and resprouting vigour of thicket shrubs would be negatively correlated with fire intensity. In relation to the response of birds to fire I posit that (1) fire reduces bird species richness and bird abundance in thicket during the first two years post-fire; and (2) fire changes feeding guild composition and results in the loss of frugivorous birds. Extensive fires in dune thicket along the southeastern Cape coast presented the opportunity to assess the responses of thicket shrubs and birds to fire. For the thicket shrubs I assessed survival and resprouting vigour of thicket shrubs post-fire in relation to fire intensity and pre-fire shrub size at two dune landscapes (Cape St Francis and Knysna) in the CFR. I furthermore compared bird species richness, bird abundance and feeding guild composition between burnt and unburnt thicket (only at Knysna). A total of 29 species and 1112 individuals of thicket shrub were surveyed, with post-fire survival being high (83-85%). Smaller shrubs had a lower probability of post-fire survival than larger individuals but there was no consistent relationship between shrub mortality and fire intensity. Fire intensity had a positive effect on resprouting shoot count but a variable effect on resprouting volume. In the bird study a total of 66 bird species and 2404 individuals were recorded of which 52 species and 1176 individuals were in burnt thicket and 60 species and 1228 individuals were in unburnt thicket. Ten species occurred only in burnt thicket and 13 species only in unburnt thicket. Insectivores and generalists were the most common feeding guilds in terms of richness and abundance in both burnt and unburnt thicket. Frugivores were more abundant in unburnt thicket than burnt thicket, whereas granivores were more abundant in burnt thicket than unburnt thicket. I conclude that thicket shrubs and bird communities are resilient to fire. Prescribed high-intensity fires in dune landscapes are unlikely to reduce the extent of thicket in fynbos or radically change the bird communities. The effects of fire on thicket shrubs and birds are likely to be short-lived as thicket shrubs resprout vigorously after fire resulting in rapid recovery of vegetation and thus bird habitat structure. However, frequent fires may prevent the encroachment of thicket shrub juveniles into fynbos, owing to the greater vulnerability of small shrubs to fire. Most recruitment of thicket shrub individuals into fynbos is via ramets that likely originate from well-established plants in mature thicket stands. These mature unburnt thicket stands provide habitat for various forest bird species and can function as refuge areas for birds and other wildlife in fire-prone landscapes. However, there is no need for managers to take any precautions when implementing controlled burns or controlling wildfires because not all thicket patches in the landscape are likely to burn.
- Full Text:
- Date Issued: 2020
- Authors: Strydom, Tiaan
- Date: 2020
- Subjects: Fire prevention -- Research -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47635 , vital:40260
- Description: Fire studies within the Cape Floristic Region (CFR) are restricted to the impacts of fire on plants and birds in fire-prone fynbos while little is known about post-fire responses of shrubs and birds in fire-avoiding subtropical dune thicket, which coexists with fynbos but burns on much longer cycles. Fire is deemed important for maintaining the boundaries between fynbos and thicket. It has been hypothesised that high-intensity fires prevent fire-dependent fynbos from being replaced by fireavoiding subtropical thicket (hereafter thicket) on dune landscapes of the CFR. I posit that (1) fire-related thicket shrub mortality would be size dependent, with smaller individuals suffering higher mortality than larger ones; and (2) that survival and resprouting vigour of thicket shrubs would be negatively correlated with fire intensity. In relation to the response of birds to fire I posit that (1) fire reduces bird species richness and bird abundance in thicket during the first two years post-fire; and (2) fire changes feeding guild composition and results in the loss of frugivorous birds. Extensive fires in dune thicket along the southeastern Cape coast presented the opportunity to assess the responses of thicket shrubs and birds to fire. For the thicket shrubs I assessed survival and resprouting vigour of thicket shrubs post-fire in relation to fire intensity and pre-fire shrub size at two dune landscapes (Cape St Francis and Knysna) in the CFR. I furthermore compared bird species richness, bird abundance and feeding guild composition between burnt and unburnt thicket (only at Knysna). A total of 29 species and 1112 individuals of thicket shrub were surveyed, with post-fire survival being high (83-85%). Smaller shrubs had a lower probability of post-fire survival than larger individuals but there was no consistent relationship between shrub mortality and fire intensity. Fire intensity had a positive effect on resprouting shoot count but a variable effect on resprouting volume. In the bird study a total of 66 bird species and 2404 individuals were recorded of which 52 species and 1176 individuals were in burnt thicket and 60 species and 1228 individuals were in unburnt thicket. Ten species occurred only in burnt thicket and 13 species only in unburnt thicket. Insectivores and generalists were the most common feeding guilds in terms of richness and abundance in both burnt and unburnt thicket. Frugivores were more abundant in unburnt thicket than burnt thicket, whereas granivores were more abundant in burnt thicket than unburnt thicket. I conclude that thicket shrubs and bird communities are resilient to fire. Prescribed high-intensity fires in dune landscapes are unlikely to reduce the extent of thicket in fynbos or radically change the bird communities. The effects of fire on thicket shrubs and birds are likely to be short-lived as thicket shrubs resprout vigorously after fire resulting in rapid recovery of vegetation and thus bird habitat structure. However, frequent fires may prevent the encroachment of thicket shrub juveniles into fynbos, owing to the greater vulnerability of small shrubs to fire. Most recruitment of thicket shrub individuals into fynbos is via ramets that likely originate from well-established plants in mature thicket stands. These mature unburnt thicket stands provide habitat for various forest bird species and can function as refuge areas for birds and other wildlife in fire-prone landscapes. However, there is no need for managers to take any precautions when implementing controlled burns or controlling wildfires because not all thicket patches in the landscape are likely to burn.
- Full Text:
- Date Issued: 2020
An impact assessment of the youth "development through football" project in Nelson Mandela Bay
- Authors: Tsotetsi, Mampho
- Date: 2014
- Subjects: Youth development -- South Africa -- Nelson Mandela Bay Municipality , Soccer -- Social aspects -- South Africa -- Nelson Mandela Bay Municipality , HIV infections -- South Africa -- Nelson Mandela Bay Municipality -- Prevention
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4664 , vital:20627
- Description: Football as the most popular sport, serves as a medium through which development issues can be addressed in a variety of ways. The potential and limitations of sport as a vehicle for change are widely recognized for informing YDF and partner organisations for change and capacity building at all levels of engagement. The YDF on HIV prevention project brought about a close working relationship between GIZ/YDF, Volkswagen groups South Africa, NGO’s, federations and government institutions. Volkswagen formed a PPP (Public Private Partnership) to promote HIV prevention among the youth in the Eastern Cape Province. The aim of the cooperation was to raise awareness and improve the knowledge of the youth on HIV prevention. The project combined peer education through football with life-skills education on HIV Prevention in schools. The present study aimed at evaluating the impact and effectiveness of the YDF project in addressing HIV prevention awareness in the selected schools of Nelson Mandela Bay. The sample consisted of fifty grades six and seven learners of the ages of twelve and over. In this mixed methods research, both qualitative and quantitative methods were used and data was collected by means of questionnaires and interviews where pre and post-test studies were conducted. The results suggest that there has been an improvement in the learners’ awareness and therefore the YDF on HIV prevention programme has been effective in improving the participants’ level of HIV prevention awareness in Nelson Mandela Bay. These findings should make a meaningful contribution to the debate on sports based participation programmes on HIV/AIDS education, with regard to the stakeholders and implementing parties, as well as to the public.
- Full Text:
- Date Issued: 2014
- Authors: Tsotetsi, Mampho
- Date: 2014
- Subjects: Youth development -- South Africa -- Nelson Mandela Bay Municipality , Soccer -- Social aspects -- South Africa -- Nelson Mandela Bay Municipality , HIV infections -- South Africa -- Nelson Mandela Bay Municipality -- Prevention
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4664 , vital:20627
- Description: Football as the most popular sport, serves as a medium through which development issues can be addressed in a variety of ways. The potential and limitations of sport as a vehicle for change are widely recognized for informing YDF and partner organisations for change and capacity building at all levels of engagement. The YDF on HIV prevention project brought about a close working relationship between GIZ/YDF, Volkswagen groups South Africa, NGO’s, federations and government institutions. Volkswagen formed a PPP (Public Private Partnership) to promote HIV prevention among the youth in the Eastern Cape Province. The aim of the cooperation was to raise awareness and improve the knowledge of the youth on HIV prevention. The project combined peer education through football with life-skills education on HIV Prevention in schools. The present study aimed at evaluating the impact and effectiveness of the YDF project in addressing HIV prevention awareness in the selected schools of Nelson Mandela Bay. The sample consisted of fifty grades six and seven learners of the ages of twelve and over. In this mixed methods research, both qualitative and quantitative methods were used and data was collected by means of questionnaires and interviews where pre and post-test studies were conducted. The results suggest that there has been an improvement in the learners’ awareness and therefore the YDF on HIV prevention programme has been effective in improving the participants’ level of HIV prevention awareness in Nelson Mandela Bay. These findings should make a meaningful contribution to the debate on sports based participation programmes on HIV/AIDS education, with regard to the stakeholders and implementing parties, as well as to the public.
- Full Text:
- Date Issued: 2014
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