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Fig. 1 | BMC Biology

Fig. 1

From: The genome of the pygmy right whale illuminates the evolution of rorquals

Fig. 1

Phylogenomic analysis of baleen whales using whole-genome alignment fragments. A Phylogenomic multi-species coalescent (MSC) tree inferred from 46,941 trees that were each constructed from a 20 kbp whole-genome alignment fragment. All branches conceived 1.0 local posterior probabilities and branch lengths were added by a maximum likelihood inference using amino acid sequences of 563 high-quality single copy ortholog sequences. The pygmy right whale was placed at the base of the rorquals, and the gray whale was grouped together with the humpback whale and fin whale. B Quartet scores of different branches across the MSC tree. Branches 1– 7 were analyzed for the number of trees supporting one of the three possible unrooted topologies (q1– q3). Branch 4, representing the position of the gray whale, received nearly equal quartet scores for all alternative topologies. C Distribution of quartet scores across the first 20 Mbp of chromosome one of the reference assembly (Tursiops truncatus), given three different topologies of branch 4 (light to dark blue). Across the chromosome, no clear runs of shared phylogenetic signals could be identified. Pygmy right whale illustration made by Frédérique Lucas. The assembly data used to generate the results shown can be found in Additional file 1: Table S6 [28,29,30,31,32,33,34,35,36,37,38]

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