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 41 for “"extinction risk"”.
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Impact of climate change on extinction risk of montane tree species.
… This thesis provides an insight into the extinction risk of selected tree species using different species distribution modelling techniques and reviewing the current conservation status on montane forest in the Tropical Andes. Starting with a global analysis, the potential impacts of …
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Regional Extinction Risk and Conservation Priorities for Persian Gulf Marine Bony Fishes
… levels. This study examines the regional extinction risk for all known marine bony fishes of the Persian Gulf. About 8.3% of the 471 marine bony fishes assessed are at elevated risk of regional extinction. The distribution of threatened species is primarily linked to coastal areas with …
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Reassessment of the extinction risk of the Neotropical freshwater crabs of the family Pseudothelphusidae
… of the Pseudothelphusidae to be threatened with extinction and projected that in the worst-case scenario (if all of the Data Deficient species turned out to be threatened), the number of threatened species would be significantly higher. In the last decade several new species of pseudothelphusids …
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The macroecological distribution of avian functional diversity: environment, extinction risk and protected area coverage
… traits explain 21.4% of the variance in global extinction risk compared to 6.7% for local extinction with diet type more important in the former and use of manmade sites in the latter. Globally, narrow-ranging species are less likely to inhabit protected areas (12% of land surface) and analyses …
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Applications of the IUCN Red List in evaluating global extinction risk of timber tree species.
… valuable species, our understanding of their extinction risk remains incomplete and outdated. In fact, many timber tree taxa are marketed under trade names only, making it difficult to identify those most at risk. An additional challenge is presented by limited data and the pressing need for …
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Hotspots, Extinction Risk and Conservation Priorities of Greater Caribbean and Gulf of Mexico Marine Bony Shorefishes
… known for only one quarter of these shorefishes. Extinction risk assessment under IUCN Red List Criteria is a widely-used, objective method to communicate species-specific conservation needs. Data were collated on each species’ distribution, population, habitats and threats and experts at three …
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Potential impacts of climate change on myosorex as a model for extinction risk of montane small mammals in South Africa
… consequently, 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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A Global GIS Analysis of Primate Diversity and Biogeography: Assessing Trends in Habitat Loss and Extinction Risk to Inform Primate Conservation
… trends in primate species distributions, extinction risk, and habitat loss over time. Concerningly, the total number of primate species that are “Threatened” increased by 20% between 2014 and 2022. The analysis shows substantial range contractions over a relatively short period and …
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It’s clam-plicated: how functional traits influenced extinction patterns of Neogene West Atlantic mollusks
… traits, both continuous and categorical, with extinction risk in bivalves and gastropods from the Plio-Pleistocene WA. Traits considered were primarily related to metabolic requirements and predation resistance, both known factors in mollusk survival. Various statistical tests were utilized to …
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Responses of raptors to habitat fragmentation : from individual responses to population susceptibility
… indicators of a species' fragmentation-linked extinction risk. For example, body size, rarity, ecological specialization, matrix use, range size and turnover rate have all been linked with species extinction risk. Few studies have, however, attempted to explore the traits that predispose …
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Global Conservation Status of Croaker and Drum (Family: Sciaenidae) and Role of the Maw Trade
<p>Understanding threats and drivers of extinction risk is critical to conserving marine biodiversity. Although marine bony fishes are some of the most diverse and abundant vertebrates in the world, overexploitation is the major threat to these taxa. Species in the family Sciaenidae are important …
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Global Conservation Status and Threat Patterns of the World’s Most Prominent Forage Fishes (Teleostei, Clupeiformes)
… and systematic approach to assessing extinction risk of species, to all clupeiform species. I then used these assessments to synthesize and address their global conservation status and to highlight the potential for improvements to conservation and fisheries management. The best …
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The Effects of Multiple Stressors on Stream Communities: The Convergence of Drought, Nutrient Pollution, and Invasive Species
… and invasive species can increase terminal extinction risk for fish metapopulations. However, I also observed several interactive effects. Drought and nutrient pollution interacted both additively and antagonistically on various portions of the food web simultaneously in my experiments, and …
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Predicting Mobile Species Response to Landscape Structure: The Roles of Spatiotemporal Pattern and Individual Dispersal
… at a significant amount of remaining habitat (extinction threshold); that local, transient changes in the quality of conditions will influence overall population performance; and that differences in dispersal behavior influence species vulnerability. Existing theory predicting population …
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On the use of demographic models to inform amphibian conservation and management: A case study of the reticulated flatwoods salamander
… model that can be used to evaluate future extinction risk. In chapter one, we quantify population sizes through time, and estimate the impact of annual variability in numbers on genetic viability. This species exists in small (< 500) breeding populations and exhibit annual fluctuations in …
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The Role of Intraspecific Variation, Species Interactions, and Eco-evolutionary Feedbacks in Population Persistence
… under balancing selection lead to population extinction? How does the interaction of various genetic problems in small populations influence their extinction risk and minimum viable population size? How do joint ITV and covariance affect the persistence and the ecological dynamics of …
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Conservation Awareness and Public Knowledge of the Endangered Southern Resident Killer Whales (Orcinus orca) on Vancouver Island, Canada
… acknowledged across all residency groups, yet extinction risk was less recognized, revealing the limits of awareness alone. Findings emphasize that, although residents express concern and a willingness to adopt pro‑conservation behaviors, effective recovery requires communication strategies …
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Climate change, variable colony sizes and temporal autocorrelation : consequences of living in changing environments
… autocorrelation in environmental noise on the extinction risk of a population, using a simple population model. The effect of autocorrelation depended on the magnitude of the effect of single catastrophic events of bad environmental conditions on a population. If a population was threatened by …
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Stochastic Models For Evolutionary Genetic Problems
… inbreeding-environment interactions increase extinction risk. The second research demonstrates that 1) the carrying capacity and initial population growth rate is critical to determine the population persistence time; 2) increasing the advantageous mutation rate reduces the extinction risk …
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