Phylogeography of the pipefish, Urocampus carinirostris, suggests secondary intergradation of ancient lineages
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چکیده
We assayed the pattern of mitochondrial DNA evolution in the live bearing, seagrass specialist pipefish, Urocampus carinirostris, in eastern Australia. These life history attributes were predicted to result in strong phylogeographic structure in U. carinirostris. Phylogenetic analysis of cytochrome b sequences detected two monophyletic mtDNA clades that differed by 8.69% sequence divergence – a large level of intraspecific divergence for a marine fish. The geographical distribution of clades was non-random and resembled clinal secondary intergradation over a 130-km stretch of coastline. Contrary to phylogeographic predictions, this large phylogeographic break does not occur across a traditionally recognised biogeographic boundary. Analyses of historical demography suggested that individuals belonging to the most widespread clade underwent a population expansion from a small refuge population during the Pleistocene.
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A mitochondrial DNA discontinuity in the mussel Mytilus galloprovincialis Lmk: pleistocene vicariance biogeography and secondary intergradation.
Studies of clinal variation have helped greatly in the elucidation of the mechanisms of both adaptation and speciation (Endler 1977; Barton and Hewitt 1989). Clines have been explained by selection acting within a continuous population ( primary intergradation ) or, more frequently, as the result of contact between populations differentiated in allopatry (secondary intergradation) (Endler 1977;...
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