Phylogenetics of Cancer crabs (Crustacea: Decapoda
We used morphological, mitochondrial DNA se-quence, paleontological, and biogeographical informa-tion to examine the evolutionary history of crabs of the genus Cancer. Phylogenies inferred from adult mor-phology and DNA sequence of the cytochrome oxidase I (COI) gene were each well resolved and well...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
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1999
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.656.6359 http://decapoda.nhm.org/pdfs/4160/4160.pdf |
| Summary: | We used morphological, mitochondrial DNA se-quence, paleontological, and biogeographical informa-tion to examine the evolutionary history of crabs of the genus Cancer. Phylogenies inferred from adult mor-phology and DNA sequence of the cytochrome oxidase I (COI) gene were each well resolved and well sup-ported, but differed substantially in topology. Four lines of evidence suggested that the COI data set accurately reflected Cancer phylogeny: (1) in the phy-logeny inferred from morphological data, each Atlan-tic species was sister taxon to an ecologically similar Pacific species, suggesting convergence in morphol-ogy; (2) a single trans-Arctic dispersal event, as indi-cated by the phylogeny inferred from COI, is more parsimonious than two such dispersal events, as in-ferred from morphology; (3) test and application of a maximum likelihood molecular clock to the COI data yielded estimates of origin and speciation times that fit well with the fossil record; and (4) the tree inferred from the combined COI and morphology data was closely similar to the trees inferred fromCOI, although notably less well supported by the bootstrap. The phylogeny inferred frommaximum likelihood analysis of COI suggested that Cancer originated in the North Pacific in the early Miocene, that the Atlantic species arose from a North Pacific ancestor, and that Cancer crabs invaded theAtlantic from the North Pacific 6–12 mya. This inferred invasion time is notably prior to most estimates of the date of submergence of the Bering Strait and the trans-Arctic interchange, but it agreeswith fossil evidence placing at least one Cancer species in theAtlantic about 8mya.! 1999 Academic Press |
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