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 9 of 9 for “"diversification rates"”.
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Diversification dynamics and evolution of the Australian temperate flora
… component of the Australian biota, the diversification dynamics and evolutionary history of this flora remains poorly understood. In particular, studies on evolutionary drivers that gave rise to the plant species disparity observed between the southwest Australian global biodiversity …
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The Convoluted Origin and Diversification of Strangler Figs in the Neotropics
… are unable to detect significant shifts in diversification rates, and estimates low extinction and high diversification rates. Convergence of leaf shape is common as the phylogeny reveals non- monophyly of three species complexes (F. americana, F. citrifolia, and F. pertusa). My second …
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The evolution of social traits and biodiversity in the ants.
… and polygyny are associated with increased diversification rates in ants. This thesis provides a valuable tool for the study of comparative hypotheses in the ants in the form of a complete genus-level phylogeny, and offers significant evidence to support several key hypotheses in social …
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Evolution of Floral Morphology and Symmetry in the Miconieae (Melastomataceae)
… our understanding of the drivers of angiosperm diversification. Integrated within a flower, labile floral characters produce different phenotypes that promote variable interactions with pollinators. Thus, investigation of floral evolution may help infer potential historic transitions in …
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Phylogenetics of North American Psoraleeae (Leguminosae): Rates and Dates in a Recent, Rapid Radiation
… divergence dates, nucleotide substitution rates, diversification rates, and the impact of climate change, past and present, on diversification of NAm Psoraleeae. Results suggest the group has undergone a recent, rapid radiation. Rates of molecular evolution are fast, relative to other …
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Dynamic river networks drive landscape change and biological evolution
… unknown. Therefore, in Chapter 2, I use erosion rates to test the accuracy of topographic evidence for divide motion along the Blue Ridge Escarpment in the Appalachian Mountains. In Chapters 3-4 I investigate the connections between geomorphic processes and biological evolution. In Chapter 3, I …
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Reweaving the tapestry: a supertree of birds
… as they are the most abundant land vertebrates on the planet and no comprehensive phylogeny of both extinct and extant species currently exists. In order to construct supertrees, primary analysis of characters is required. One such study, presented here, describes two new partial specimens …
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Dispersal, gene flow, niche divergence and local adaptation in the hyper-diverse ruschioid Aizoaceae: testing alternative modes of speciation in the Knersvlakte quartz field flora of the Succulent Karoo, South Africa
… of extraordinarily diverse regions and clades. Diversification in the Cape flora of South Africa has been intensively studied owing to its remarkable diversity, for which significant roles for both ecological and non-ecological speciation have been invoked as drivers. However, much of this …
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A Genomics Approach to Conservation, Systematics, and Phylogeography to Understand Two Lineages of Lamiales
… (4) examines patterns of biogeography and diversification, and (5) addresses conservation concerns and prospects in a phylogenetic context. Phylogenetic analyses indicate that Barlerieae is monophyletic (given our sampling) and resolve relationships among all thirteen currently recognized …