3. Electronic Theses and Dissertations (ETDs) - All submissions
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Item Determining the role and relative importance of predator avoidance and nutrition as processes influencing herbivore utilisation of burnt areas in Satara, Kruger National Park, South Africa(2016-05-11) Luhdo, ZoeThis study aimed to determine the role and relative importance of predator avoidance and nutrition as processes influencing herbivore utilisation of burnt areas, at Satara, Kruger National Park by using variation in fire size and fire season. The driving factors investigated included forage quality, forage quantity, vegetation structure and predation risk. The effect of fire size and season on the landscape was tested by recording grass height, greenness, grass nutrient sampling and visibility. Results showed that fire size and season had a significant impact on the physical environment by decreasing grass/forage quantity post-fire but increasing grass/forage quality. Over time the plots returned to near pre-fire conditions, with forage quantity increasing (grass height and biomass) and forage quality decreasing (nitrogen availability). Visibility increased immediately post-fire, more significantly in regards to herbivores with their heads in a “head-down/grazing” position than in a “head raised/vigilant” position. As with forage quantity and quality, visibility returned to near pre-fire conditions at the end of the study sampling period. The response of animals to these changes in the environment was recorded through dung counts, camera traps and behavioural observations. I found that there was increased use of burnt plots post-fire through comparing herbivore presence on plots burned in different sizes and seasons, day/night utilisation of plots, and using behaviour data I could determine to what extent forage and predation risk were driving the use of burnt areas. I focused on three herbivore species (Aepyceros melampus, Connochaetes taurinus and Equus quagga) which varied in terms of body size digestive systems, forage type, and social behaviour. As expected, I found that predation risk did appear to be more important in driving the behaviour of the smaller-bodied herbivores but both nutrient requirements and susceptibility to predation were shown to play a role in explaining the use of burnt areas for all three herbivore species. Variation between plots in environmental factors such as tree density, forb percentage and distance to water, were found to be not significant and thus did not confound our resultsItem Adopting a heterogeneity paradigm for understanding and managing elephants for biodiversity : a case study in riparian woodlands in Kruger National Park(2016) Gaylard, AngelaDecades of study devoted to solving the “elephant problem” have generally concurred that increasing elephant populations inevitably reduce biodiversity. However, recent evidence suggests that such reductions can be accompanied by increases in other components of biodiversity, and that ultimately elephant effects are scale-dependent. Although this new perspective now underpins elephant management strategies in savannas such as the Kruger National Park (KNP), South Africa, few empirical studies in support of this strategy have incorporated the contribution of spatial context, or allowed for the emergence of relevant scales, in their interpretations of heterogeneity. Moreover, use of traditional modes of scientific enquiry and statistical approaches for investigating heterogeneity in complex systems have been challenged. Recent advances in spatial statistics, together with an alternative mode of science that draws upon multiple lines of converging evidence rather than testing narrowlyfocused hypotheses, have the potential to address these challenges. However, their practical application for understanding elephants as agents of change remains lacking. Riparian zones along the ephemeral rivers in northern KNP provided an ideal landscape to explore the spatial and temporal parameters of elephant effects in response to surface water, as a critical resource, and hence to develop a framework for a heterogeneity approach for understanding and managing elephants as agents of change in savannas.Item Fingerprints of nature: an Ecological Discovery Centre magnifying and mediating human-nature interactions along the border of the Kruger National Park(2015-04-29) King, Bronwyn“Architecture embodies humanity’s relationship with the earth” (Hoosey, L. 2012. Pg. 118) There are many threats facing South Africa’s wildlife including the spread of diseases, increased poaching and habitat loss. As a result the Kruger National Park is one of South Africa’s most prized treasures and has become a wildlife recreation, resource and research hub attracting tourists and researchers from around the globe. However, despite the number of visitors to the area, there is an increasing number of local communities specifically on the Southern border of the park, experiencing high levels of unemployment and poverty. As a result, community members are often involved in the harvesting and trade of natural resources through activities such as subsistence poaching and farming. These practices are gradually destroying the natural landscape on the periphery thus posing a significant threat to the park’s biodiversity. In a contest between resource consumption and resource conservation architecture has the opportunity to mediate between the user groups of the region, sparking conversation about conservation. This thesis seeks to provide a building complex which will become the interface between land users and land uses and in so doing become a catalyst in the rehabilitation of the natural landscape. It will provide a platform for an exchange of conservation-based resources, information and skills intended to enhance the experience and understanding of nature. The complex includes a seed bank facility to store and grow a variety of indigenous botanical species to rehabilitate the landscape and support the harvesting of sustainable natural resources. The seed bank is directly linked to the research facility which is dedicated to the investigation and understanding of human-nature interactions along the park’s border. These conservation processes and findings are captured and revealed in the narrative of the ecological museum which forms a large component of the education spaces provided within the project. The three primary programs are consolidated within the design to create a constructed journey through the site. This enables the architecture to become the tour guide that enhances the visitor’s experience through man-made and ecological encounters along the way. In so doing a layering of public/private spaces is established using thresholds to create transition zones which blur the boundaries between inside and outside whilst maintaining a hierarchy of space. As with the building’s program the design is sensitive to its context. The project explores the typologies of the local community, farm structures and botanical nurseries to create an appropriate hybrid between the manufactured and hand crafted. This aesthetic is achieved through the use of locally sourced materials and labour in an attempt to reintroduce the disappearing vernacular building techniques to the region. This exploration is realised in the structural concept of articulating and combining elements of mass, skeleton and skin. In so doing, the architecture becomes a living organism which is climate responsive and houses both people and nature within its form. The structure is designed using the ‘eave’ to create an edge condition that modifies the micro climate of the interior and exterior spaces. It is through these edge conditions that the aesthetic of the building is transformed as species inhabit the structure to establish new ecosystems. This thesis does not attempt to provide a solution to the many threats facing this conservancy, but rather to focus on an area dealing with such challenges and allow architecture to house the means to empower, educate and expose users to the fragility of the natural landscape of the region. It is essential that wildlife conservation is extensively studied and implemented in order for nature to sustainably benefit the communities living off it; tourists travelling to it and conservationists working for it.Item The influence of pan characteristics on their seasonal usage by mammals within the Makuleke Ramsar Wetland System(2015-01-30) Antrobus, RomyCentral to the study of animal ecology is the usage an animal makes of its environment. In arid and semi-arid environments worldwide, the availability of surface water largely determines the behaviour, distribution and abundance of animals. As a consequence, the distribution and quality of water are factors that influence carrying capacities of protected areas in environments such as the Kruger National Park, South Africa. Just as wildlife may select water sources according to water quality, they may also select drinking locations according to perceived predation risk. Predation risk can therefore strongly influence the patch use and resource selection of animals. Similarly, human traffic and activity in natural areas can also have an effect on the behaviour and resource use of resident wildlife. This research investigates mammal usage patterns at selected water sources within the Makuleke Wetland System in Kruger National Park to contribute towards management planning for this important Ramsar Wetland Site. The research examines daily and seasonal trends in usage as well as possible links to water quality, land cover and human disturbance. Camera traps were set up seasonally at perennial pans and rivers within the Makuleke Wetland system to determine mammal species’ usage patterns. Environmental characteristics associated with each water source, such as water quality, vegetation cover and extent of human activity were also determined. A cluster analysis and Canonical Correspondence Analysis (CCA) were run in order to determine how environmental variables may influence mammal species’ seasonal drinking site selection. Overall, mammals appear to be selecting for drinking sites with increased distances to ground cover where they are more likely to see predators in advance. Mammal species appear to be avoiding the Zimbabwean border as a result of human activity in the Zimbabwean side of the Great Limpopo Transfrontier Park. The perennial pans and rivers appear to be a significant water source during the dry months to large herbivore and large carnivore species, which display the greatest seasonal fluctuations. Elephants show the greatest demand for water during the dry season and access the perennial water sources throughout the day and night. The Makuleke wetland system, and in particular the perennial water sources, provide an important dry season refuge for the northern Kruger National Park’s and the Greater Limpopo Transfrontier Park’s elephant population. The Luvuvhu River and its associated pan (Nwambe), within its floodplain, are sources of water for the greatest diversity and richness of species when compared to the water sources associated with the Limpopo floodplain, within the Makuleke Wetland System. Information from this study may aid South African National Parks management with their “adaptive management” strategy for Kruger National Park, to manage the park in an ever changing environment. It is widely accepted that emphasis be placed on the major role river systems play in biodiversity, and hence their high priority in conservation.Item A hierarchical state space model of greater Kudu (Tragelaphus Strepsiceros) population dynamics in the Kruger National Park(2012-01-16) Gatawa, TatendaAbundance counts of ungulate species which are carried out using an aerial census are susceptible to measurement errors. These measurement errors result from environmental factors such as vegetation cover and the resultant effect that factors, such as the annual rainfall pattern, have on the accuracy of the count. Given these measurement errors, models of population abundance that are based on these counts should not only account for the population dynamic process - they need to model the measurement error process simultaneously in order to produce plausible estimates. In addition to this, the recorded counts from these censuses do not give a breakdown of the total count into the different gender and life-history stages of the animals counted. This research report investigates the usefulness of a hierarchical Bayesian hidden process modelling approach at explicitly including the measurement error process and a sub-model for the gender and life-history stage of the animals counted into a population dynamics model based on the aerial census counts. The data used are aerial counts of Kudu in the Kruger National Park from 1983 to 1993. The result is a model which estimates the measurement error in each year of the census and also breaks down the overall count into the numbers in each gender and life-history stage. The usefulness of the model is evaluated based on statistical model diagnostics.