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 11 of 11 for “"Extinction risks"”.
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Predicting extinction risks to landbirds on tropical islands : a Western Indian Ocean model
Includes bibliographical references.
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Using genetic tools to understand the population ecology of stream fishes
… channels, and thereby face an elevated risk of extinction. Genetic estimates of divergence indicate that fragmentation was recent, coincident with the construction of major dams throughout the species' range. Close evolutionary relationships between most populations suggest that a translocation …
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Conservation genetics of Australian quolls
… were implemented in an attempt to mitigate extinction risks. This thesis provides genetic (microsatellite) data to guide management of the four Australian quoll species. Parameters of interest to conservation were examined. Differences between translocated and endemic, island and mainland, …
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The Foraging Ecology, Habitat Use, and Population Dynamics of the Laysan teal (Anas laysanensis)
… mammalian predators, are needed to reduce extinction risks to the Laysan teal.
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Integrating dynamic and statistical modelling approaches in order to improve predictions for scenarios of environmental change
… response to environmental change and associated extinction risks. However, predictions were highly variable across simulations emphasising the need for principal evaluation tools like sensitivity analysis to assess uncertainty and robustness in dynamic range predictions. Furthermore, I identify …
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Assessing species richness patterns and conservation threats (due to overharvesting and climate change) in South African Cycads, with emphasis on a population of Encephalartos tranvenosus Stapf and Burt Davy from the Soutpansberg Mountain, Limpopo Province
… of this plant group, they have been facing high extinction risk. Currently they are referred to as the most threatened plant group in the world. Many ecological and anthropological forces are promoting extinction crisis of this taxonomic group. Africa is one of the centres of diversity of this …
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Potential impacts of climate change on myosorex as a model for extinction risk of montane small mammals in South Africa
… will experience the highest risk of extinction, at least in some parts of its range as a result of global warming associated with climate change by the year 2070. The results showed that global warming is an important factor that results in range shifts, thus affecting the …
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Molecular phylogenetics, taxonomy and niche-based conservation risk assessment of Thesium L. (Santalaceae)
… of range extent, specialisation and the relative extinction risks associated with both ecological strategies. Here, it is predicted that a combination of edaphic, elevation and climate variables influence the geographic range of Thesium in the GCFR. Recent phylogenetic hypotheses revealed that …
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THE ECOLOGICAL IMPORTANCE AND EVOLUTIONARY POTENTIAL OF PHENOTYPIC PLASTICITY IN NOVEL ENVIRONMENTS
… population encounters novel environments, where extinction risks are high such as at the edge of geographic ranges or when there are sudden environmental shifts. Although plasticity has been shown to facilitate the production of novel phenotypes in novel environments, it is less clear whether …
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Using population ecology to inform the conservation of Nevada's rare plants
… of population viability, prediction of extinction risks, and evaluation of conservation objectives. Population censuses and demographic monitoring are important tools in illuminating overall population trajectories a species face, as well as reveal the mechanisms behind those trends. …
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Conservation Through Population Assessments Across Variable Landscapes
… to produce direct information on population extinction risks. Combining a spatially explicit metapopulation model with empirical data on endemic species’ ranges and maps of habitat cover, I could calculate the metapopulation capacity— a measure of a landscape’s ability to sustain a …