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 42 for “"local extinction"”.
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Extinction in turbulent swirling non-premixed flames
This thesis investigates the localized and global extinction in turbulent swirling non-premixed flames with Large Eddy Simulation (LES) and sub-grid scale Conditional Moment Closure (CMC) model. The first part of this thesis describes the derivations of the three dimensional conservative CMC …
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Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift
… and chemically dynamic habitats despite local extinction events. Regional population extension and rapid recolonization by the siboglinid tubeworm Riftia pachyptila have been well documented along the East Pacific Rise and the Galápagos Rift. To analyze spatial and temporal population …
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Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift
… and chemically dynamic habitats despite local extinction events. Regional population extension and rapid recolonization by the siboglinid tubeworm Riftia pachyptila have been well documented along the East Pacific Rise and the Galápagos Rift. To analyze spatial and temporal population …
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Relationships between herbivores and Colophospermum mopane of the Northern Tuli Game Reserve, Botswana /
… Factors hypothesized to be responsible for their local extinction include ant predation, edaphic factors and browse quality differences, between mopane trees in the NTGR and those in adjoining areas. This study concludes that large mammals, especially elephants, are managing the resources of the …
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Demographic processes determining the range dynamics of plant species, and their consequences for biodiversity maintenance in the face of environmental change
… dispersal, reproduction, mortality and local extinction) and an observation submodel (describing imperfect detection of individuals). The demographic submodel links species-specific habitat models describing the suitable habitat and process-based demographic models that consider local …
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Is local plant extinction a product of mutualism breakdown? A case study of the Namaqualand spring flora
… to predict which plant species are vulnerable to extinction in the absence of insect pollinators. The predictions of this model were then compared with actual plant species compositions between adjacent disturbed and undisturbed sites in a Namaqualand flowering community. It was found that …
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Late Pleistocene Sciurids from Kokoweef Cave
<p>Three local (Tamias panamintinus, Ammospermophilus leucurus and Spermophilus variegatus) and five extralocal (Tamias minimus, Tamias palmeri, Marmota flaviventris, Spermophilus townsendii, and Spermophilus lateralis) sciurid species (Sciuridae) were identified from the late Pleistocene-early …
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Molecular divergence within the blue penguin (Eudyptula minor (Forster)) complex : A dissertation submitted in partial fulfilment of the requirements for the Degree of Bachelor of Science with Honours
… the southern limit of the population caused the local extinction of Otago populations (recolonised later by Australian E. minor), and allowed New Zealand blue penguins to colonise Australia. We compared the mitochondrial control regions of E. minor from Phillip Island (Southern Australia), …
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Diversidade de Chiroptera do quaternário de Serra da Mesa (GO) com ênfase na morfologia do aparelho mastigatório
… the recent fauna of Brazil, and may represent a local extinction. The diversity of Chiroptera found in Serra da Mesa is equivalent to that described for Bahia, which heretofore has the most abundant record for Quaternary bats from South America.
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Determinants of native and exotic plant species diversity and composition in remnant oak savannas on southeastern Vancouver Island
Many regional and local factors can influence the distribution of native and exotic species in ecological communities. I examined the regional- and local-scale determinants of native and exotic vascular plant species richness and composition in a highly fragmented oak savanna ecosystem on …
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Adult demography and larval processes in coastal benthic populations intertidal barnacles in Southern California and Baja California
… to environmental stochasticity and more prone to local extinction than populations located further north. This thesis emphasizes the importance of characterizing factors that affect the dynamics of benthic populations at mUltiple spatial-temporal scales, and the usefulness of small· scale …
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Abundance, distribution, and threats of mammals and trees within the Lingadzi Namilomba Forest Reserve within Lilongwe, Malawi, and a conservation action plan for the protection of the Reserve
… to provide a baseline study that can be used by local authorities to monitor and manage the park rationally. A systematic line transect census was used to survey the mammals within the reserve, whilst belt transects and 10x10 quadrats were used to carry out a botanical inventory. DISTANCE …
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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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Bird's response to seasonality: investigating the range dynamics of birds through dynamic occupancy models
… in occupancy between 2014 and 2018. I modelled local extinction (departure) and colonisation (arrival) as a function of changes and anomalies in average monthly rainfall, temperature and vegetation. Among the obligate migrants, the best performing models indicated that colonization and …
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The Past, Present, and Future of Large Reptiles: Rewilding, Climate Change, and Conservation Palaeobiology
Species extinctions reduce the diversity of functions that an ecosystem can provide, with negative effects for both natural habitats and society. Rewilding is the restoration of these ecosystem functions by returning locally extinct species or their ecological analogues to an environment. Rewilding …
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Impacts of elk management and riparian condition on songbirds in Rocky Mountain National Park
… as a result of a trophic cascade involving the local extinction of wolves (Canis lupus) and an exponential increase in elk (Cervus elaphus). In 2008, RMNP began installing elk exclosures to protect and restore willow communities and the diverse taxa that depend on riparian ecosystems from heavy …
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Nemo no more? Spatial demographic and population genetic analyses of the two-band anemonefish, Amphiprion bicinctus, in the Gulf of Eilat, Red Sea
… does not recover, the anemonefish could face local extinction. Additionally, due to the sedentary nature of adult anemonefishes, pelagic larval phases represent the only life stage during which dispersal among reef areas may be possible. In order to examine potential dispersal and population …
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Effects of forest fragmentation on the demography of ovenbirds (Seiurus aurocapillus) in the boreal forest
… in small farm fragments were rescued from extinction by immigration of birds from contiguous forest, where excess juveniles were produced. Populations in farm fragments were more likely to be rescued from local extinction by first time breeders (95% first time breeders) than the other …
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Species Composition and Spatial Ecology of Amazonian Understory Mixed-Species Flocks in a Fragmented Landscape
… more important driver in flock dissolution than local extinction.
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Evaluating occupancy and the range dynamics of invasive bird species in South Africa
… can be controlled and the risk posed to the local ecosystem minimized. Thus, there is significant benefit in the study of invasive species as a means of aiding those charged with protecting indigenous wildlife. The occupancy and population range dynamics of the Myna and Mallard species are …
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