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.
Results
Showing 1 to 20 of 112 for “"ecological impacts"”.
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The ecological impacts of a novel nematode control agent
… study aimed to address commercially relevant and ecological important questions on the use of a potential novel nematode control agent, BGT, as developed by Arcis Biotechnology Ltd. In laboratory assays, bacterial species and a yeast showed different levels of susceptibility to BGT exposure. It is …
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Ecological impacts of biological invasions on native birds in Africa
The impacts of biological invasions on native avian diversity have been the subject of many studies in Africa. However, a holistic synthesis of available information from different taxa and their impacts on native birds is lacking. From published information, I analysed the negative and positive …
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The ecological impacts of climate warming and pollution on freshwater microbial communities
… larger European project (CROSSLINK) studying the impacts of urbanisation on freshwater streams. Sixteen mesocosms were used to emulate streams wherein sediment samples from each of the eight sourcestreams were randomly split across two treatments and exposed to ambient (13 °C) or warmed +4 °C (17 …
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Toward a More Integrative Approach to Quantifying the Ecological Impacts of Invasive Plants
… In response, identification of invasive plant impacts are one of the top most studied aspects of plant invasions. Yet we still know very little about invasive plant impacts, and many land managers remove invasive plants not because of known negative impacts, but because of the general negative …
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The physical and ecological impacts of mangrove expansion and mangrove removal: Tauranga Harbour, New Zealand
… limited information available to predict the impacts of either course of action. This study was developed to investigate the physiognomic characteristics of the mangrove stands, and the physical and ecological impacts of their expansion within three embayments of Tauranga Habour: Welcome Bay, …
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Integrating ecological impacts into evaluations of the effectiveness of environmental regimes: the example of CITES
… less attention has been given to the actual ecological or biophysical aspects of regime effectiveness. The focus on institutional effectiveness is for sound reasons, such as challenges associated with incorporating ecological factors into any evaluation, measuring effectiveness, and …
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Soil degradation and associated socio-ecological impacts in the drylands of Nakasongola district, Central Uganda
This study investigated the causes, magnitude and selected socio-ecologlcal effects of soil degradation, with the ultimate goal of explaining and mapping the spatial and temporal variations of degradation in the dryland area of central Uganda.
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An assessment of ecological impacts of community-based restoration on communal grasslands in the Drakensberg foothills
… aim of this study was to determine some of the ecological impacts of community based restoration in these communal grasslands.
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Documenting the Patterns and Ecological Impacts of a Densovirus on Melissa Blue Butterflies (Lycaeides melissa) and Beyond
… taxa is insightful for understanding general ecological and evolutionary processes of host-viral interactions.
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Biotic and abiotic factors influencing the invasion success and ecological impacts of the Pacific oyster, Crassostrea gigas
… activity. Invasive species can have severe ecological impacts on recipient ecosystems causing changes in biodiversity, habitat complexity and species interactions. After being introduced for aquaculture purposes worldwide, the Pacific oyster, Crassostrea gigas, has become one of the most …
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Do Mosquito Pesticides Harm Their Natural Enemies? Ecological Impacts and Non-Target Effects of Larvicides on Mosquito Predators
<p>Larvicides are chemicals used to kill juvenile mosquitoes. When applied to an area, other aquatic organisms are exposed to these chemicals. The removal or impairment of top insect predators could be beneficial to mosquito populations once harmful pesticide levels dissipate. Two common larvicides …
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Ecological impacts of shrimp trawling on juveniles of selected benthic fish species in the southwestern Gulf of Maine
<p>The ecological impacts of shrimp trawling on juveniles of selected benthic fish were studied in the southwestern Gulf of Maine. The fish community and selected environmental variables were sampled at two sites in summer and winter during 1998 and 1999. The community was composed of 24 species in …
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Productivity, physiology, community dynamics, and ecological impacts of a grassland agro-ecosystem: integrating field studies and ecosystem modeling
… such as biomass production and benefits from an ecological perspective such as mitigation of greenhouse gas emissions. My research has investigated the physiology, productivity and community dynamics of grassland ecosystems by combining field studies and modeling techniques. In an agriculture …
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Ecological impacts of invasive mussels (Mytilus galloprovincialis) colonising the canopy of kelp forests in False Bay, South Africa
… was to gain a better understanding of the ecological impacts of the invasive mussel colonising the canopy of kelp forests in False Bay. It was found that M. galloprovincialis were more likely to occur on the outer edge of kelp beds, where there is more water movement, and mussel masses are …
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The use and valuation of natural fuelwood resources in Paulshoek, Namaqualand and the ecological impacts on rangeland dynamics
This study was undertaken in Paulshoek, a rural village in Namaqualand, to identify how important natural fuelwood resources are for the daily survival of the inhabitants. Household interviews, household surveys and PRA (Participatory Rural Appraisal) exercises were used to identify the plant …
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A Paleolimnological Investigation into the Ecological Impacts of Permafrost Thaw Slumping on Cladocerans (Branchiopoda, Crustacea) in the Mackenzie Delta Region (Northwest Territories, Canada)
This thesis explores the ecological impacts of retrogressive thaw slumping on cladocerans (Branchiopoda, Crustacea) in Mackenzie Delta Region (Northwest Territories, Canada) lakes using paleolimnological techniques to answer the following questions: 1) Does thaw slumping increase UV exposure of …
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Predicting ecological impacts of climate change and species introductions on a temperate chalk stream in Southern Britain - a dynamic food web model approach.
… each species node was removed in turn. Although impacts were found, particularly after the removal of important prey nodes and top predators, no catastrophic shift was observed and, consequently, no keystone species were identified. Impacts of species introductions were assessed by adding …
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Biological invasions in brackish waters
… non-native species (NNS) cause deleterious ecological, economic, social impacts worldwide. Brackish waters are transitional areas subject to invasion by taxa that may subsequently spread into adjacent freshwater and marine systems. The tendency for ports to be situated in brackish estuaries …
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