Understanding the relationship between mangrove composition, stand dynamics and resource use in the Ntafufu estuary, Eastern Cape, as basis for sustainable resource use
- Mvakade, Monica, Rajkaran, Anusha
- Authors: Mvakade, Monica , Rajkaran, Anusha
- Date: 2020
- Subjects: Estuarine ecology -- South Africa -- Eastern Cape , Aquatic ecology , Marine sciences , Fresh water
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/49215 , vital:41611
- Description: Traditionally, coastal communities along the Wild Coast in the Eastern Cape, used mangrove forests for their livelihoods and socio-economic needs. Mangroves along the Eastern Cape coast are threatened by both natural and human factors. The wood obtained from the mangroves by rural households was used as poles for house and fence construction, firewood, and traditional medicine. This is a threat to the status of several mangrove species in this and surrounding areas. The harvesting of mangrove trees will have a direct and indirect effect on the other biotic and abiotic components of the mangrove ecosystems. The Department of Agriculture, Forestry and Fisheries (DAFF) (currently the Department of Environment, Forestry and Fisheries, or DEFF), through the National Forest Act no 84 of 1998, was directly responsible for the wellbeing of the national forests in South Africa. This also includes the mangroves as a specific national forest type. Several estuaries with mangroves occur within state forests. The harvesting and clear-felling of trees for timber and land conversion and associated waste of harvested mangrove poles and laths causes the many changes in mangrove forests. The aim of this study was to develop a framework for sustainable management of the mangroves for the Mtambalala forest management unit. This was done in relation to the requirements of the current legislation, policy guidelines and business plan of the management authority. The aim was pursued through two specific objectives. The first objective was to understand the variation in the composition in different parts of the Ntafufu Estuary, and the population dynamics of the main mangrove species, as basis for the development of sustainable resource use practices. Plots along transects were used to measure seedling to adult ratios, population structure and abiotic characteristics. The second objective was to understand the community use and requirements of mangrove wood from the Ntafufu Estuary. A participatory approach was followed to collect demographic data from each community, the requirements of mangrove poles and behaviour of harvesters. This was used to set up a framework to guide the sustainable management of mangroves based on the current status and stand dynamics of the mangrove communities. There are three mangrove species found in the Ntafufu Estuary: Bruguiera gymnorhiza (black mangrove) regenerates under the mangrove canopy and forms layers of even-aged stands. Avicennia marina (white mangrove) does not regenerate under a mangrove canopy i.e. the seedlings establish outside the canopy. A few Rhizophora mucronata (red mangrove) trees exist in the lower intertidal zone and form multiple stems on stilt roots. The mangrove associate, Hibiscus tiliaceus (wild cotton tree- mangrove associate), forms dense clusters of scrambling stems. Some of the Avicennia individuals show signs of mangrove bleeding and one individual of Bruguiera showed indications of disease. Mngazana and Ntafufu Estuaries had the highest tree densities of 2594 and 1402 trees ha-1 respectively, typical of riverine mangrove forest. The seedling to adult ratio was high in this study: 12.8 for B. gymnorrhiza and 24.3 for A. marina. Abandoned cut stems and laths were found during the study. Bark harvested for traditional medicine and cattle feeding in mangroves was also prevalent and expected to reduce the health of the forest. Mangroves in the Ntafufu Estuary are expanding, and the population structure of the three mangrove species showed a healthy balance between young and mature stems. The harvesting of Black mangrove (B. gymnorrhiza) poles for mainly roof construction is relatively limited. As part of the functions of the DAFF, the use of the mangrove resources has to be balanced with the resource availability from the mangroves, and this should result in a healthy functioning mangrove forest. Development of a participatory forest management (PFM) plan for a forest estate and its forest management unit, require an understanding of the mangrove communities and their dynamics, and the current level of resource use associated with the mangroves. The study recommended that a Mangrove Pole Harvesters Group is needed to practice silviculture through guidance of relevant governmental personnel.
- Full Text:
- Date Issued: 2020
- Authors: Mvakade, Monica , Rajkaran, Anusha
- Date: 2020
- Subjects: Estuarine ecology -- South Africa -- Eastern Cape , Aquatic ecology , Marine sciences , Fresh water
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/49215 , vital:41611
- Description: Traditionally, coastal communities along the Wild Coast in the Eastern Cape, used mangrove forests for their livelihoods and socio-economic needs. Mangroves along the Eastern Cape coast are threatened by both natural and human factors. The wood obtained from the mangroves by rural households was used as poles for house and fence construction, firewood, and traditional medicine. This is a threat to the status of several mangrove species in this and surrounding areas. The harvesting of mangrove trees will have a direct and indirect effect on the other biotic and abiotic components of the mangrove ecosystems. The Department of Agriculture, Forestry and Fisheries (DAFF) (currently the Department of Environment, Forestry and Fisheries, or DEFF), through the National Forest Act no 84 of 1998, was directly responsible for the wellbeing of the national forests in South Africa. This also includes the mangroves as a specific national forest type. Several estuaries with mangroves occur within state forests. The harvesting and clear-felling of trees for timber and land conversion and associated waste of harvested mangrove poles and laths causes the many changes in mangrove forests. The aim of this study was to develop a framework for sustainable management of the mangroves for the Mtambalala forest management unit. This was done in relation to the requirements of the current legislation, policy guidelines and business plan of the management authority. The aim was pursued through two specific objectives. The first objective was to understand the variation in the composition in different parts of the Ntafufu Estuary, and the population dynamics of the main mangrove species, as basis for the development of sustainable resource use practices. Plots along transects were used to measure seedling to adult ratios, population structure and abiotic characteristics. The second objective was to understand the community use and requirements of mangrove wood from the Ntafufu Estuary. A participatory approach was followed to collect demographic data from each community, the requirements of mangrove poles and behaviour of harvesters. This was used to set up a framework to guide the sustainable management of mangroves based on the current status and stand dynamics of the mangrove communities. There are three mangrove species found in the Ntafufu Estuary: Bruguiera gymnorhiza (black mangrove) regenerates under the mangrove canopy and forms layers of even-aged stands. Avicennia marina (white mangrove) does not regenerate under a mangrove canopy i.e. the seedlings establish outside the canopy. A few Rhizophora mucronata (red mangrove) trees exist in the lower intertidal zone and form multiple stems on stilt roots. The mangrove associate, Hibiscus tiliaceus (wild cotton tree- mangrove associate), forms dense clusters of scrambling stems. Some of the Avicennia individuals show signs of mangrove bleeding and one individual of Bruguiera showed indications of disease. Mngazana and Ntafufu Estuaries had the highest tree densities of 2594 and 1402 trees ha-1 respectively, typical of riverine mangrove forest. The seedling to adult ratio was high in this study: 12.8 for B. gymnorrhiza and 24.3 for A. marina. Abandoned cut stems and laths were found during the study. Bark harvested for traditional medicine and cattle feeding in mangroves was also prevalent and expected to reduce the health of the forest. Mangroves in the Ntafufu Estuary are expanding, and the population structure of the three mangrove species showed a healthy balance between young and mature stems. The harvesting of Black mangrove (B. gymnorrhiza) poles for mainly roof construction is relatively limited. As part of the functions of the DAFF, the use of the mangrove resources has to be balanced with the resource availability from the mangroves, and this should result in a healthy functioning mangrove forest. Development of a participatory forest management (PFM) plan for a forest estate and its forest management unit, require an understanding of the mangrove communities and their dynamics, and the current level of resource use associated with the mangroves. The study recommended that a Mangrove Pole Harvesters Group is needed to practice silviculture through guidance of relevant governmental personnel.
- Full Text:
- Date Issued: 2020
The impact of agricultural infrastructure on rural livelihoods in KwaZulu-Natal
- Authors: Mankahla, Sipesihle Qukeza
- Date: 2020
- Subjects: Agriculture -- Economic aspects , Agricultural development projects -- South Africa -- KwaZulu Natal , Project management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/46141 , vital:39508
- Description: The purpose of the study was to investigate the impact of agricultural infrastructure on rural livelihoods of kwaZulu-Natal. The main objective of the study is to look into the ways in which rural infrastructure can improve the livelihoods of kwaZulu-Natal farmers. Government programmes such as agri-parks, one household-one hectare and cooperative funding, when implemented according to their objective, can improve the implementation of infrastructure development in rural areas of kwaZulu-Natal. The objectives of the study were achieved by reviewing the literature relevant to the topic. Data was sourced from primary and secondary sources. A qualitative method was used as the qualitative approach has been considered to be the most appropriate method in achieving research objectives. This approach puts emphasis on the meanings and experiences as found in the study of Lincoln and Denzin. This approach best describes events, opinions and views without the use of data in the form of numbers; rather it provides textual data that gives an insight into the occurrence being studied. The developments in agriculture would not be sustainable without developing the rural areas and addressing the issues of poverty and enhancing investment capacities of the resource-poor farmers. The linkage of infrastructure to positive economic development cannot be denied. Agricultural infrastructure is infrastructure such as irrigation, rural electrification, roads, and markets in close coordination with institutional infrastructure. There is a long list of infrastructure assets that affect rural development. There is basic agricultural infrastructure which forms the foundation for agricultural economic development of rural livelihoods. This infrastructure includes transport networks, access to water and livestock agricultural infrastructure. Thus, the study sought to establish the impact of existing agricultural infrastructure on agricultural economic development and improvement of rural livelihoods in kwaZulu-Natal. The study revealed that the rural farmers in this province were affected and limited by poor road infrastructure and that access to suitable water for irrigation was far from ideal. As a result, the sector is hindered and does not perform to its full potential and this slows economic development and negatively affects rural livelihoods.
- Full Text:
- Date Issued: 2020
- Authors: Mankahla, Sipesihle Qukeza
- Date: 2020
- Subjects: Agriculture -- Economic aspects , Agricultural development projects -- South Africa -- KwaZulu Natal , Project management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/46141 , vital:39508
- Description: The purpose of the study was to investigate the impact of agricultural infrastructure on rural livelihoods of kwaZulu-Natal. The main objective of the study is to look into the ways in which rural infrastructure can improve the livelihoods of kwaZulu-Natal farmers. Government programmes such as agri-parks, one household-one hectare and cooperative funding, when implemented according to their objective, can improve the implementation of infrastructure development in rural areas of kwaZulu-Natal. The objectives of the study were achieved by reviewing the literature relevant to the topic. Data was sourced from primary and secondary sources. A qualitative method was used as the qualitative approach has been considered to be the most appropriate method in achieving research objectives. This approach puts emphasis on the meanings and experiences as found in the study of Lincoln and Denzin. This approach best describes events, opinions and views without the use of data in the form of numbers; rather it provides textual data that gives an insight into the occurrence being studied. The developments in agriculture would not be sustainable without developing the rural areas and addressing the issues of poverty and enhancing investment capacities of the resource-poor farmers. The linkage of infrastructure to positive economic development cannot be denied. Agricultural infrastructure is infrastructure such as irrigation, rural electrification, roads, and markets in close coordination with institutional infrastructure. There is a long list of infrastructure assets that affect rural development. There is basic agricultural infrastructure which forms the foundation for agricultural economic development of rural livelihoods. This infrastructure includes transport networks, access to water and livestock agricultural infrastructure. Thus, the study sought to establish the impact of existing agricultural infrastructure on agricultural economic development and improvement of rural livelihoods in kwaZulu-Natal. The study revealed that the rural farmers in this province were affected and limited by poor road infrastructure and that access to suitable water for irrigation was far from ideal. As a result, the sector is hindered and does not perform to its full potential and this slows economic development and negatively affects rural livelihoods.
- Full Text:
- Date Issued: 2020
Photocatalytic reduction of CO2 by cobalt doped TiO2 and ZnO micro/nanostructured materials
- Authors: Mgolombane, Mvano
- Date: 2020
- Subjects: Nanostructures , Catalysis , Nanotechnology , Chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/49171 , vital:41607
- Description: Large emissions of carbon dioxide (CO2) in the atmosphere have caused many harmful effects on humans and the environment. Carbon dioxide is a good source C and is used in a number of applications such as synthesis of fossil fuels. Redox reaction of CO2 and H2O with photocatalysts such as TiO2 and ZnO to produce solar fuels is a promising approach in reducing the environmental impacts of greenhouse gasses. This dissertation describes an in-depth synthesis of four photochemical catalysts and their photocatalytic conversion of CO2 to methanol, thereby addressing the above-mentioned problems by applying synthesised nano-based catalysts. Prior to photocatalytic reduction studies, catalysts such as TiO2, Co-doped TiO2, Co-doped TiO2/rGO, ZnO, Co-doped ZnO and Co-doped ZnO/rGO were synthesized and characterized using various spectroscopic and imaging techniques such as Powder X-Ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Transmission Electron Micrograph (TEM), X-ray Photoelectron Spectroscopy (XPS), Brunner- Emmet- Teller measurement (BET), Thermogravimetry Analysis (TGA) and UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis-DRS). The conversion yield of CO2 to methanol on TiO2, Co-doped TiO2 and Co-doped TiO2/rGO reached 32.3 μmol/gcat, 730 μmol/gcat and 936 μmol/gcat, respectively, after 7 h of irradiation. Theoretical studies via Density functional theory (DFT) revealed that doping TiO2 with Co ions facilitated the formation of adsorbed carbonate or CO2•- species, as CO2 adsorbs onto Co-doped TiO2 surface with binding energy (BE) of -18.12 KJ/mol. The photocatalytic activities of ZnO-based nanomaterials found that Co-doped ZnO/rGO with high ratio of Co, reduced graphene (rGO) and large surface area (10.62 m2g-1) possessed higher CH3OH (30.1 μmol/g) in comparison with Co-doped ZnO (27.3 μmol/g) and ZnO (7.5 μmol/g). The research will deepen the understanding that TiO2 based photocatalyst show higher activity and the mole ratio (Ti/Zn:Co) influences nanocomposites performance and provide new ideas for designing efficient photocatalysts.
- Full Text:
- Date Issued: 2020
- Authors: Mgolombane, Mvano
- Date: 2020
- Subjects: Nanostructures , Catalysis , Nanotechnology , Chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/49171 , vital:41607
- Description: Large emissions of carbon dioxide (CO2) in the atmosphere have caused many harmful effects on humans and the environment. Carbon dioxide is a good source C and is used in a number of applications such as synthesis of fossil fuels. Redox reaction of CO2 and H2O with photocatalysts such as TiO2 and ZnO to produce solar fuels is a promising approach in reducing the environmental impacts of greenhouse gasses. This dissertation describes an in-depth synthesis of four photochemical catalysts and their photocatalytic conversion of CO2 to methanol, thereby addressing the above-mentioned problems by applying synthesised nano-based catalysts. Prior to photocatalytic reduction studies, catalysts such as TiO2, Co-doped TiO2, Co-doped TiO2/rGO, ZnO, Co-doped ZnO and Co-doped ZnO/rGO were synthesized and characterized using various spectroscopic and imaging techniques such as Powder X-Ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Transmission Electron Micrograph (TEM), X-ray Photoelectron Spectroscopy (XPS), Brunner- Emmet- Teller measurement (BET), Thermogravimetry Analysis (TGA) and UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis-DRS). The conversion yield of CO2 to methanol on TiO2, Co-doped TiO2 and Co-doped TiO2/rGO reached 32.3 μmol/gcat, 730 μmol/gcat and 936 μmol/gcat, respectively, after 7 h of irradiation. Theoretical studies via Density functional theory (DFT) revealed that doping TiO2 with Co ions facilitated the formation of adsorbed carbonate or CO2•- species, as CO2 adsorbs onto Co-doped TiO2 surface with binding energy (BE) of -18.12 KJ/mol. The photocatalytic activities of ZnO-based nanomaterials found that Co-doped ZnO/rGO with high ratio of Co, reduced graphene (rGO) and large surface area (10.62 m2g-1) possessed higher CH3OH (30.1 μmol/g) in comparison with Co-doped ZnO (27.3 μmol/g) and ZnO (7.5 μmol/g). The research will deepen the understanding that TiO2 based photocatalyst show higher activity and the mole ratio (Ti/Zn:Co) influences nanocomposites performance and provide new ideas for designing efficient photocatalysts.
- Full Text:
- Date Issued: 2020
Parents’ perceptions of the content of pre-school lunch boxes following a nutritional programme in Nelson Mandela Bay
- Authors: Midigo, Odwour Erich
- Date: 2020
- Subjects: Children -- Nutrition
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/46429 , vital:39587
- Description: Rationale: Lunchboxes that parents prepare for preschool children have been noted to fall short of the recommended paediatrics dietary standards. No research has been done in Nelson Mandela Bay (NMB) to describe the perceptions of parents preparing the lunch boxes, particularly in underprivileged communities, and if nutrition education strategies can improve these practices. This study answered the following research question: How can nutrition education programmes play a role in parents’ perceptions about the content of the lunchboxes of children attending early childhood development centres (ECD) in underprivileged communities of NMB metropole? Aim: The research aimed at describing and exploring parents’ perceptions of the content of pre-school children’s lunch boxes following a nutrition programme.Methods: This descriptive, explorative study adopted a qualitative approach. Twenty-five participants were selected conveniently while five pre-schools were purposively sampled. Following the nutrition programme, data was collected through five Focus Group (FG) discussions and five interviews and was thematically analysed. The ethical principles that guided the study included justice, beneficence and autonomy. Results and Discussion: Five major themes and seventeen sub-themes emerged (1) Participants described the typical foodstuff in children’s lunch boxes which included both high quality and lower-quality foods and fluids; (2) Participants provided views (such as food preferences) on lunch box choices; (3) Principals appraised lunch box rules and the significance of revised rules to improve the lunch boxes;(4) Challenges such as poverty limited healthy food choices; (5) Participants commented on initiatives noted following the nutrition training; for instance, some schools commenced the cultivation of vegetable gardens. Conclusion and Recommendations: The study highlights that specific parent programmes helped to improve healthy lunch box choices in the study population. There is a need for parent programmes tailored to fathers. Dieticians and nutritionists in NMB can train practitioners as change agents in their respective schools.
- Full Text:
- Date Issued: 2020
- Authors: Midigo, Odwour Erich
- Date: 2020
- Subjects: Children -- Nutrition
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/46429 , vital:39587
- Description: Rationale: Lunchboxes that parents prepare for preschool children have been noted to fall short of the recommended paediatrics dietary standards. No research has been done in Nelson Mandela Bay (NMB) to describe the perceptions of parents preparing the lunch boxes, particularly in underprivileged communities, and if nutrition education strategies can improve these practices. This study answered the following research question: How can nutrition education programmes play a role in parents’ perceptions about the content of the lunchboxes of children attending early childhood development centres (ECD) in underprivileged communities of NMB metropole? Aim: The research aimed at describing and exploring parents’ perceptions of the content of pre-school children’s lunch boxes following a nutrition programme.Methods: This descriptive, explorative study adopted a qualitative approach. Twenty-five participants were selected conveniently while five pre-schools were purposively sampled. Following the nutrition programme, data was collected through five Focus Group (FG) discussions and five interviews and was thematically analysed. The ethical principles that guided the study included justice, beneficence and autonomy. Results and Discussion: Five major themes and seventeen sub-themes emerged (1) Participants described the typical foodstuff in children’s lunch boxes which included both high quality and lower-quality foods and fluids; (2) Participants provided views (such as food preferences) on lunch box choices; (3) Principals appraised lunch box rules and the significance of revised rules to improve the lunch boxes;(4) Challenges such as poverty limited healthy food choices; (5) Participants commented on initiatives noted following the nutrition training; for instance, some schools commenced the cultivation of vegetable gardens. Conclusion and Recommendations: The study highlights that specific parent programmes helped to improve healthy lunch box choices in the study population. There is a need for parent programmes tailored to fathers. Dieticians and nutritionists in NMB can train practitioners as change agents in their respective schools.
- Full Text:
- Date Issued: 2020