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 92 for “"non-native species"”.
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Invasive non-native species and the management and exploitation of freshwater ecosystems
… also vulnerable to the establishment of invasive non-native species (INNS), whose prevalence has rapidly accelerated through the expansion of global travel, trade, and transportation. INNS can drive significant changes in habitat suitability and native community composition. I investigated how …
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Assessing the vulnerability of Antarctic marine ecosystems to invasive non-native species
Invasive non-native species are a major threat to global biodiversity. For at least 15 million years coastal Antarctica has been poorly connected to nearby temperate ecosystems due to physical and physiological barriers. Yet, Antarctica is experiencing significant environmental change and becoming …
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Conservation of the native freshwater fishes of the Cape floristic region (South Africa) : management of non-native species
… habitat degradation and the introduction of non-native species, will continue to place pressure on the remaining native freshwater fishes. A meta-analysis estimated that more than 90% of river habitat in three major catchments has been invaded by non-native fish and that catchments covering …
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The role of Marine Renewable Energy structures and biofouling communities in promoting self-sustaining populations of Non-Native Species
… have the potential to promote the spread of non-native species (NNS). Knowledge of how community composition resident on MREDs is shaped by geography, local hydrodynamics and the duration of deployment, will clarify how these technologies will interact with natural habitats, including the …
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The Consequences of Non-Native Species Invasions on the Contemporary and Historic Trophic Ecology of Native Sport Fish in a Lake Michigan Embayment
… of Lake Michigan’s Little Bay de Noc. We found species-specific differences in the δ<sup>15</sup>N and δ<sup>13</sup>C values for 14 fish species. High degrees of niche overlap between walleye, northern pike (<em>Esox lucius</em>), smallmouth bass (<em>Micropterus dolomieu</em>) and yellow perch …
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Predicting the distribution and impacts of non-native birds in the Iberian Peninsula
Increasing numbers of species are being transported beyond their natural range boundaries by humans. These non-native species can have severe negative impacts on native biodiversity. In order to guide management of these species it is important to be able predict where non-native species will …
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Marine Invasive Species in the Galapagos Marine Reserve
… transport and tourism. Invasions occur when species get transported from one region to another and establish themselves in the new habitat. These species compete for space and resources, displacing native species and changing, populations and communities. Invasive non-native species are the …
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Abundance Trends and Drivers of Change in Freshwater Fish Communities of the New River Basin
Habitat destruction/alteration and non-native species are widely considered the two most serious threats to biodiversity within freshwater ecosystems, which are among the most threatened in the world. I examined the effects of these factors, specifically focusing on land use and non-native species …
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Distribution of non-native wetland plants is facilitated by urbanization and roads in the Chicago region
… has facilitated the spread and establishment of non-native plant species. Urban areas have often been introduction points for species and have a combination of factors making them susceptible to invasion; including reduced habitat area, loss of unique habitat types, and increased nutrient …
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Exploring the mechanisms and impacts of plant invasions in grasslands
Non-native plant species are being introduced to ecosystems worldwide at an unprecedented rate. Many of these non-native species become invasive by spreading across their introduced ranges and impacting native biota, ecosystems and human societies. However, the impacts of the majority of non-native …
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Plant communities along Irish roads: the impact of humans and potential to improve biodiversity
… adjacent fields plus reference points in the non-road landscape. In addition, a controlled experiment was undertaken to assess the vulnerability of road verges (which followed different landscape treatments) to invasive non-native species. Regarding species richness, the road verge habitat was …
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Eco-engineering of coastal infrastructure: A design for life
… resulting in a loss of natural habitat, species diversity and ecosystem services. To mitigate the impacts of ocean sprawl, the practice of eco-engineering of coastal infrastructure has been developed. A strong evidence base in support of eco-engineering is growing, yet there remain …
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Human networks of tetrapod translocations in the Western Cape, South Africa: trends and potential impacts on biodiversity
… managers are increasingly turning to species translocations to achieve conservation goals. These human induced movements of wildlife have a number of potential impacts, one being the introduction of non-native species that may establish and become invasive. Although the underlying …
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The Status of the Genus Taxus In Kentucky
… of field and herbarium specimens from both native and non-native species, microscopic analysis of leaf ultrastructure, chemical analysis of taxane content, and the construction of GIS models to predict the occurrence of the native species. In the review and examination of morphological …
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Diversity patterns and conservation priorities in the "Mountains of Central Asia" biodiversity hotspot
… concentrations of endemic vascular plant species coincide with high vulnerability, thereby guiding global conservation efforts. Within this framework, the biodiversity hotspot “Mountains of Central Asia” (MoCA) represents a particularly important but still understudied region. A systematic …
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Ecological implications of introducing Leucaspius delineatus (Heckel, 1843) and Pseudorasbora parva (Temminck and Schlegel, 1842) into inland waters in England
Non-native species invasions threaten the structure, function and biodiversity of ecosystems worldwide, and those of non-native fishes pose amongst the greatest threats to inland waters of the U.K. This PhD investigated the establishment, dispersal and ecological implications of introducing the two …
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Distribution and dispersal of the non-native caprellid amphipod, Caprella mutica Schurin 1935
The introduction of non-native species is the second most important anthropogenic threat to global biodiversity, with the first being habitat destruction. In the UK, we have been fortunate to date, that the majority of marine non-native species have not caused significant adverse ecological …
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The effects of herbivory, competition, and disturbance on island meadows
It is an unresolved paradox that non-native species are successful in novel environments whereas native species, presumably adapted to that environment, decline. This knowledge gap has persisted because third party processes in invasion ecology have been overlooked. Ungulate densities are …
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Population crash of an endemic South African cyprinid: the role of non-native fish, drought and other environmental factors
Native freshwater fish are in decline worldwide due to human impacts including impoundment, changes to water quality, over-abstraction, climate change and the introduction of non-native species. South Africa's Cape Fold Ecoregion (CFE) harbours exceptionally high freshwater fish endemism, yet the …
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History, Ecology and Restoration Potential of Salmonid Fishes in the Umpqua River, Oregon
… dam building, hatchery supplementation and non-native species introduction were reviewed. Decreases in runs were compared to impacts to the river over time to determine the impact that had the largest effect on salmonid abundance. Although anthropogenic impacts have occurred throughout the …
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