Seven new dolphin mitochondrial genomes and a time-calibrated phylogeny of whales |
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Authors: | Ye Xiong Matthew C Brandley Shixia Xu Kaiya Zhou and Guang Yang |
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Institution: | (1) Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, PR China;(2) Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut, USA |
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Abstract: | Background The phylogeny of Cetacea (whales) is not fully resolved with substantial support. The ambiguous and conflicting results of
multiple phylogenetic studies may be the result of the use of too little data, phylogenetic methods that do not adequately
capture the complex nature of DNA evolution, or both. In addition, there is also evidence that the generic taxonomy of Delphinidae
(dolphins) underestimates its diversity. To remedy these problems, we sequenced the complete mitochondrial genomes of seven
dolphins and analyzed these data with partitioned Bayesian analyses. Moreover, we incorporate a newly-developed "relaxed"
molecular clock to model heterogenous rates of evolution among cetacean lineages. |
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