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 “"divergence dates"”.
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Dead bugs do tell tales: implications of a new fossil assassin bug (Heteroptera: Reduviidae) for the evolutionary history and systematics of an extant lineage
… calibration point in order to re-estimate the divergence dates of Reduvioidea. This analysis also utilizes a new set of fossil calibrations from previous studies. Tree topology is inferred using MrBayes and RAxML, and divergence dates are inferred using BEAST2. Convergence was not reached in …
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Systematics of Ficinia clade (Cyperaceae)
… macroevolution in Ficinia clade; to estimate the divergence dates and investigate the role of ecology the speciation of sister species of the genus Ficinia; and to revise the taxonomy of the species in the Ficinia indica complex (F. indica, F. dunensis, F. elatior, F. aff. indica R and F. aff. …
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A PHYLOGENETIC REEVALUATION OF THE GENUS GAVIA (AVES: GAVIIFORMES) USING NEXT-GENERATION SEQUENCING
… molecular clock based estimates of divergence dates placed the most recent common ancestor of modern loons in the early Miocene, which is earlier than previously thought, ~21.4 mya (20-22.8 mya) provides a more parsimonious explanation for body size evolution in loons.</p>
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Phylogenetics of North American Psoraleeae (Leguminosae): Rates and Dates in a Recent, Rapid Radiation
… estimated phylogenies are used to investigate 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 …
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Phylogenetic Systematics and Evolution within the Family Scincidae
… likelihood and Bayesian methods are used to date divergence times within the group. Results show that DO consistently finds more optimal tree topologies regardless of the optimality criterion used, and provides the ability to use models throughout the alignment and tree reconstruction process. …
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Evolutionary history of the canary grasses (Phalaris, Poaceae)
… of polyploidy in speciation to be assessed. Divergence dates for the genus were determined using Bayesian methods (BEAST, version 1.6.2) and historic patterns of dispersal were analyzed with RASP (version 2.1b). Self-incompatibility and the feasibility of hybridization between major groups …
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Evolution of gender associated mitochondrial DNA in bivalves
… After invasion the two mtDNA lineages begin divergence de novo. Secondly, the Mytilus M type mtDNA has been shown to evolve more rapidly than the F type and it is hypothesized that this is due to relaxed selection on the M genome. Lastly, the Mytilus F type mtDNA has been shown to evolve more …
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Molecular systematics and conservation genetics of gliding petaurids (Marsupialia: petauridae).
… distributed over distinct geographical regions. Divergence dates calculated for the two major mtDNA clades suggested that environment and climate changes which occurred during the Pliocene may have facilitated this diversification. Habitat fragmentation is generally considered to be a major …
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THE WORLD ACCORDING TO GARS: THE MOLECULAR SYSTEMATICS AND COMPARATIVE PHYLOGEOGRAPHY OF LIVING GARS (ACTINOPTERYGII: LEPISOSTEIDAE)
… and <italic>L. platostomus<italic>. Using dates associated with the best fossil data available (244 Ma minimal age of the node joining bowfins to gars, and 100 Ma for Lepisosteidae), I estimated divergence dates under a relaxed molecular clock model in a Bayesian framework. Estimated ages …