Pattern and process of plant invasion in an African savanna ecosystem, with emphasis on multiple spatial and temporal scales

 

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dc.contributor.advisor Richardson, David Mark en_ZA
dc.contributor.advisor Rouget, Mathieu en_ZA
dc.contributor.author Foxcroft, Llewellyn Courtney en_ZA
dc.date.accessioned 2014-10-29T10:08:27Z
dc.date.available 2014-10-29T10:08:27Z
dc.date.issued 2007 en_ZA
dc.identifier.citation Foxcroft, L. 2007. Pattern and process of plant invasion in an African savanna ecosystem, with emphasis on multiple spatial and temporal scales. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/8918
dc.description Includes bibliographical references. en_ZA
dc.description.abstract Biological invasions are a significant ecological and economic global crisis. Protected areas also suffer from the increased burden that invasions place on their resources and the impacts placed on the ecosystem. However, management requires an ecological foundation which can inform best practice and optimize its responses. l explored the patterns and processes of invasion in Kruger National Park (KNP), South Africa; a large national park situated in the Lowveld savanna ecosystem. l used spatially-explicit alien plant data at various scales from a national database, the whole of KNP, a specific region, river system, and small scale plots in one invaded area of KNP. Using various statistical techniques, primarily classification and regression tree analysis, logistic regression, ANOVA, Nestedness and spatial pattern analysis, I assessed the relationship between the patterns observed at a specific spatial grain and extent, discussing the implications for invasion ecology and management. Using this knowledge and conceptual tools, I developed a new framework and model which contributes to invasion theory. Scale is a critical component in evaluating alien plant invasions. Without careful consideration of scale, studies from different scenarios cannot be compared and the science of invasion ecology will not advance. I provide a framework for assessing the risks of plant invasions in a watershed, using both an area- and species-approach, highlighting areas of current and future potential concern. I also explore the role of intentional introduction of ornamental plants and discuss management approaches for dealing with this. Evaluating a riparian system provides insights into how different patches in a landscape are differentially invaded, and how patch type characteristics need to be considered carefully for management and monitoring. I also describe how reconstructing the invasion history of a species, complemented by fine scale assessment, provides insights into species-specific spread models, and also how these types of studies can input into general theories, such as the role of propagule pressure. These components together provide insight into the dynamics of alien plant invasions in an African savanna and protected area system. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Botany en_ZA
dc.title Pattern and process of plant invasion in an African savanna ecosystem, with emphasis on multiple spatial and temporal scales en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Doctoral en_ZA
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image


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