Phylogeny and divergence of the pinnipeds (Carnivora: Mammalia) assessed using a multigene dataset |
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| Authors: | Jeff W Higdon Olaf RP Bininda-Emonds Robin MD Beck Steven H Ferguson |
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| Institution: | 1.Department of Geography,University of Manitoba,Winnipeg,Canada;2.Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem Museum,Friedrich-Schiller-Universit?t Jena,Jena,Germany;3.School of Biological, Earth and Environmental Sciences,University of New South Wales,Sydney,Australia;4.Fisheries and Oceans Canada,Winnipeg,Canada |
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| Abstract: | Background Phylogenetic comparative methods are often improved by complete phylogenies with meaningful branch lengths (e.g., divergence
dates). This study presents a dated molecular supertree for all 34 world pinniped species derived from a weighted matrix representation
with parsimony (MRP) supertree analysis of 50 gene trees, each determined under a maximum likelihood (ML) framework. Divergence
times were determined by mapping the same sequence data (plus two additional genes) on to the supertree topology and calibrating
the ML branch lengths against a range of fossil calibrations. We assessed the sensitivity of our supertree topology in two
ways: 1) a second supertree with all mtDNA genes combined into a single source tree, and 2) likelihood-based supermatrix analyses.
Divergence dates were also calculated using a Bayesian relaxed molecular clock with rate autocorrelation to test the sensitivity
of our supertree results further. |
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