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 38 for “"Vicariance"”.
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The influence of vicariance and dispersal on the diversification and evolution of springtails (collembola)
Vicariance and dispersal are major drivers of the evolution of biodiversity, yet the relative impact of these processes, and the factors that influence them, often remain elusive. Identifying and understanding evolutionary processes responsible for generating diversity is essential for …
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Systematics and biogeography of the Great Basin pocket mouse, Perognathus parvus
… provide a foundation for studying biogeographic vicariance hypotheses related to its distribution. Vicariance hypotheses involving late Tertiary geotectonic events and dispersal hypotheses of Pleistocene glacial-interglacial climatic cycles that may be responsible for phylogeographic structure in …
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Phylogenetic Studies of the Laurels and Heathers (Ericaceae: Ericoideae, Phyllodoceae and Cassiope Clades)
… to infer ancestral areas of nodes, and putative vicariance events. Identification of these events was followed by relative dating of vicariance events using BEAST (Bayesian Evolutionary Analysis by Sampling Trees). This analysis revealed vicariance events in the Northern Hemisphere that likely …
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Avian Diversification in the Andes: Understanding Endemism Patterns and Historical Biogeography
… Andean tectonic and palaeoclimate change through vicariance. Thus, if the Andes uplift is responsible for some of the patterns of montane-lowland disjunctions, it may be one of the mechanisms underlying the taxonomic assembly of the Andean montane avifauna. In this dissertation I explored whether …
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Phylogenetic relationships among beetles within the genus Onymacris (Coleoptera : Tenebrionidae) : a phenetic versus cladistic approach
… are discussed in the lignt of the tenets of vicariance biogeography and the constraints of adaptation to the extreme desert environment.
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COMPARATIVE BIOGEOGRAPHY OF NORTH AMERICAN PIKA PARASITES: UNRAVELING A HISTORY DRIVEN BY CLIMATE CHANGE
… driven by taxon pulses, with expansion and vicariance cycles reflecting periods of environmental stability and perturbation, leading to complex histories of colonization and host-switching within pikas.</p>
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Birds, molecules, and evolutionary patterns among Africa's islands in the sky
… in Africa. Rather, both dispersal and vicariance have played important roles in shaping montane bird communities. Thus, a refugia type model does work, but only within the context of pulsed or cyclic expansion and contraction of montane forests, supported in thus study by the consistent …
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Historical biogeography of rhacophorid frogs of Japan and the Ryukyu Archipelago inferred from a phylogenetic perspective
… patterns of these frogs are the result of past vicariance events, and (2) to present an hypothesis of their historical biogeography. For example, both phylogenies indicate that some species from Taiwan are more closely related to species from Japan proper than to other species in the Ryukyu …
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Investigations of Phylogenetic Relationships of the Percidae (Actinopterygii: Perciformes) Using Comparative DNA Sequences
… of populations supports a pre-Pleistocene vicariance hypothesis to explain the current disjunct distribution of P. evides.
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Systematics, Phylogeography and Ecology of Elaphomycetaceae
… pattern expected by a scenario of continental vicariance. Dating analysis in BEAST confirmed that broadly distributed clades are, in most cases, too young for this pattern to be explained by continental vicariance, indicating that occasional long-distance dispersal has been a significant …
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Patterns and processes in animal evolution : molecular phylogenetics of Southern Hemisphere fauna : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Genetics
… of organisms: dispersal, extinction and vicariance. The Southern Hemisphere has an intriguing and complicated geological history that provides an ideal backdrop to study these processes. This thesis focuses on three historical events that illustrate these processes: the proposed marine …
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An Evolutionary and Ecological Investigation into the Enigmatic Stalked Puffball Genus Tulostoma
… the genus. The phylogeography also suggests both vicariance and long-distance dispersal events contributing to the diversification of the species over the evolutionary history of the genus. The evolution of spore morphology is then investigated using a phylogenetic approach. The ancestral …
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Evolutionary history and taxonomy of the titi monkeys (callicebinae)
… clades that diverged in the late Miocene through vicariance of a widespread ancestral range. Species relationships were generally recovered with strong support, and species-level diversification in the Amazonian clades was characterised by sequential founder events across river barriers in the …
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Phylogeograpy of Aphanicercella cassida (Plecoptera : Notonemourida) : cryptic speciation?
… populations displays evidence of an ancient vicariance event. This finding definitely warrants further investigation into whether the population of A. cassida in Mpumalanga is a cryptic species. More sampling has to be done within the studied populations and more populations should be added …
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Systematics of the Philippine endemic Ixora L. (Rubiaceae, Ixoreae)
… Also, the results of the Statistical Dispersal-Vicariance Analysis (S-DIVA) revealed a complex biogeographical history for Ixora with several dispersal and vicariance events that have led to its current distribution. Furthermore, Philippines are shown to constitute an overlay zone into which …
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Population Structure of Lethrinus Lentjan (Lethrinidae, Percoidei) Across the South China Sea and the Philippines Is Detected With Lane-Affected RADSeq Data
… in several Indo-Pacific species. Pleistocene vicariance is a suspected driving factor in lineage diversification for this species, supporting the hypothesis that the Coral Triangle is a center of origin. Before management or conservation strategies can be implemented, a stock assessment should …
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Influences of Historical and Contemporary Environmental Conditions on Threatened and Endemic Aquatic Organisms
… and found a complex history of dispersal and vicariance, which likely occurred during the Pliocene and Pleistocene, that influenced current distributions. This work supports a stepping-stone model of dispersal, suggesting coastal drainages acted as islands, where species were able to transfer …
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Evolutionary and genetic basis of morphological variation in Populus nigra (European black poplar)
… recent glacial event, indicating that historic vicariance and not just adaptive divergence influence phenotypic variation. Identification of quantitative trait loci (QTL) for insect herbivory in a common garden study of hybrid poplar indicated that leaf morphology might also be influenced by …
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Molecular systematics of the cashew family (Anacardiaceae)
… clade of Anacardiaceae, it is unlikely that vicariance played a role in the evolution of Madagascan Anacardiaceae. One possible scenario based on phylogenetic reconstruction is that Anacardiaceae was dispersed over water between Africa and Madagascar a minimum of three times.
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