Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Alien Plants"”.
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The effects of invasive alien plants on cultural ecosystem services : tourism and recreation
With the continued spread of invasive alien vegetation in South Africa, there is a growing need and recognition in protecting ecosystem service delivery. While most literature on ecosystem services has focussed on provisioning and supporting services, this study looks at the less addressed cultural …
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An assessment of land degradation and alien plants invasion in the Waterberg Biosphere Reserve, Limpopo Province
Land degradation and invasion by alien plants are interconnecting issues that span both natural and socio-economic systems. As a result, addressing the complexity and severity of these pressures requires the use of a multidisciplinary approach. This study aims to assess land degradation and …
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Effects of ash from native and alien plants on phytoplankton biomass and mosquito abundances: A mesocosm experiment
… quinine tree Rauvolfia caffra) and three aliens (lantana Lantana camara, gum Eucalyptus camaldulensis, guava Psidium guajava)] based on a six–week mesocosm experiment with different ash concentrations (1 and 2 g L–1). We assessed concentrations of chemical elements, i.e., N, P, K, Ca, Mg, …
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Ecosystem level impacts of annual and perennial N2-fixing invasive alien plants in the fynbos vegetation of South Africa
… structure. The N2-fixing ability of invasive alien plants, therefore, may have impacts on ecosystem and community functioning within the fynbos vegetation type. This study investigated changes in fynbos N cycling regimes with the invasion of two different N2-fixing invasive alien plants, …
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Familiarizing the Alien: Designing working nodes that reveal the opportunity of invasive alien plants as a resource in the Theewaterskloof catchment area
… dam is almost entirely infested with invasive alien plant species which are the single largest contributor to water loss from the dam (up to ±300 million liters of water are lost per year). Given the context of severe water scarcity in the region, the management of these alien invasive species, …
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An investigation of riparian vegetation recovery following invasive alien tree clearing in the Western Cape
… particularly susceptible habitats to invasion by alien plants. In South Africa, particularly the Fynbos Biome, closed-stand invasions by alien Acacia and Eucalyptus species have been able to develop within riparian areas. Their impacts on water resources and biodiversity have been countered by …
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Predicting rates and patterns of alien plant spread
The invasion of alien plants into natural ecosystems is a widespread phenomenon that impacts negatively on ecosystem structure and functioning. The invasion and subsequent spread of an alien plant population is equivalent to the processes of colonisation and migration. This implies that the …
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The impacts of different methods of alien plant control on the recovery of Fynbos ecosystems
… of past management aimed at clearing invasive alien plants in South African fynbos ecosystems. The treatments included "bulldozing and aerial-spraying", "aerial-sprayiing", "boom-spraying" and "spot-spraying". Both an ant study and vegetation survey was conducted to test the hypothesis that …
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The restoration of riparian plant communities following alien plant clearing in the Western Cape
… that are highly susceptible to invasion by alien plants. the vegetation of riparian zones controls the flow of water, nutrients and sediments into streams. Plan communities in these habitats are often rish in species, and serve as corridor facilitating the movement of organisms.
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Assessing the variations in alien plant communities within powerline corridors: A case study of Fundudzi and Khakhu Powerline Corridors
… patterns, and may also encourage the spread of alien plants. The spread of alien plants from one area to another through intentional and unintentional human activities is a serious threat to the world’s biodiversity, including that of South Africa. Vegetation management in powerline corridors in …
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The influence of native plants on arthropod population dynamics: can native plants enhance conservation biological control
… populations. Through increased urbanization, alien vegetation is being planted; these plants may be unacceptable hosts for herbivores. We tested the prediction that urban landscapes composed of native plants host a diverse herbivore population and attract and sustain a diverse community of …
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Conservation implications of the invasion of southern Africa by alien organisms
Alien species known to be invading untransformed ecosystems in southern Africa, and, more particularly, those inside nature reserves, were identified. The extent and ecological impacts of these invasions were assessed. Their control within reserves was also evaluated. Research approaches used were; …
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Viability analysis for investing in ecological infrastructure to secure water supply: A case study of South Africa
… services that benefit human well-being. Invasive alien plants (IAPs) are degrading catchment areas which negatively impacts delivery of hydrological ecosystem services. Clearing IAPs is considered a catchment conservation intervention that preserves these services. This study used South Africa as …
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Aspects of plant dispersal in the southwestern Cape with particular reference to the roles of birds as dispersal agents
The dispersal of plants with particular attention to the roles birds play as dispersal agents was studied in the southwestern Cape, South Africa from 1983 to 1985. The research was organized as ten inter-related studies, each with an independent data base. Each chapter focused on a different scale …
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Aliens in the nursery : assessing the awareness and attitudes of Cape Town nursery managers in regard to invasive species regulations
… for the introduction and spread of invasive alien plants (IAPs). In recognition of this, the South African government has recently enacted a new set of Alien and Invasive Species regulations, under the National Environmental Management Biodiversity Act (NEMBA), that are intended, in part, to …
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Tackling poverty at its roots: a case study of skills development in integrated conservation and development with the example of the Working For Water programme
… world and a pioneer in the control of invasive alien plants (IAPs). The WfW programme provides work opportunities and training for beneficiaries and contractors to control IAPs, using biological, mechanical and chemical methods. Skills development in the EPWP is regarded as a key factor to …
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From camera traps to conservation: biodiversity and mammal functional diversity in the Langkloof Corridor, Eastern Cape province, South Africa
… structure, fire, livestock grazing, invasive alien plants, water availability, and human disturbance. Results showed that mammal richness were strongly shaped by protection status and landscape heterogeneity. Unprotected farmlands supported higher species richness compared to private reserves, …
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Plant-flower visitor interactions in the Sacred Valley of Peru
… as predicted. Species richness of visited plants reached a maximum at the highest altitudes. Using ordination analysis, hummingbirds, honeybees, flies and beetles were identified as major functional groups of flower visitors with significantly different visitation profiles. Nestedness …
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Mapping Elaeagnus Umbellata on Coal Surface Mines using Multitemporal Landsat Imagery
Invasive plant species threaten native plant communities and inhibit efforts to restore disturbed landscapes. Surface coal mines in the Appalachian Mountains are some of the most disturbed landscapes in North America. Moreover, there is not a comprehensive understanding of the land cover …
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