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 9 of 9 for “"divergence time estimates"”.
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Molecular evolution of beta (â) keratins in three bird species and divergence time estimates for the avian â-keratin subfamilies
… been published and through the knowledge of divergence times and molecular differences between these birds, a better understanding of â-keratin evolution can be achieved and applied to the study of feather evolution. It has been found that tandem arrays of â-keratins reside on several …
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Total evidence phylogeny of ducks, geese and swans(family Anatidae): implications for macroevolution andbiogeography
… a Bayesian approach, with the latterresulting in divergence time estimates that indicate that crown-clade Anatidae originated in the Early Miocene about 19 Ma (95% HPD 14.8-29.0 Ma). The undated and dated total evidence topologies were also used to reconstruct the evolution ofselected …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… or nonspecific record on geologic timescales. This thesis develops and employs novel geochemical and genetic approaches to illuminate diagnostic signals of microbial metabolisms. Field studies, laboratory cultures, and computational models explain how methanogens produce unique …
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Population genetics and systematics of a species-rich clade of Neotropical reef fishes, the tubeblenny genus Acanthemblemaria
… an absolute rate of nearly 25% pairwise sequence divergence per million years. Replicate Bayesian phylogenetic analyses failed to converge on the same posterior distributions because proposals to update the rate multiplier parameter were rarely accepted, but when the tuning parameter was adjusted, …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
… or nonspecific record on geologic timescales. This thesis develops and employs novel geochemical and genetic approaches to illuminate diagnostic signals of microbial metabolisms. Field studies, laboratory cultures, and computational models explain how methanogens produce unique …
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Crustacean phylogenetic systematics and opsin evolution
… phylogenetic relationships and estimated divergence times using 16S mtDNA, H3 nDNA, and 18S and 28S rDNA sequence data in conjunction with a set of eight fossil calibrations. Reconstructed phylogenies show support for two well supported nodes corresponding to the Pleocyemata and the …
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The taxonomy, systematics and biogeography of the austral horse fly tribe scionini (Diptera : Tabanidae)
… key to all seventeen recognised genera. Divergence time estimates based on the molecular data and the fossil record placed global biogeographic radiations of the Pangoniinae in a temporal context. Results indicated that the Scionini are a typical Gondwanan group and are most likely …
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The taxonomy, systematics and biogeography of the austral horse fly tribe scionini (Diptera : Tabanidae)
… key to all seventeen recognised genera. Divergence time estimates based on the molecular data and the fossil record placed global biogeographic radiations of the Pangoniinae in a temporal context. Results indicated that the Scionini are a typical Gondwanan group and are most likely …
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Systematics and biogeography of leafhoppers in Madagascar
… of these lineages were then used to estimate divergence times in order to test different biogeographic hypotheses and determine the most likely scenario(s) for the origin of the Malagasy leafhopper fauna. The species of two widely distributed leafhopper groups in Madagascar, the endemic …