Mitochondrial DNA phylogeography of the harbour porpoise Phocoena phocoena in the North Pacific

作者:Mioko Taguchi; Susan J. Chivers; Patricia E. Rosel; Takashi Matsuishi and Syuiti Abe 刊名:Marine Biology 上传者:万胜湍

【摘要】Genetic structure and phylogeography of the harbour porpoise Phocoena phocoena in the North Pacific were examined using 358 bps sequences from the 5′ end of the mitochondrial DNA control region including those reported previously and newly obtained from the west Pacific. AMOVA and pairwise population φ st estimates clearly revealed genetic differentiation between an east/south and a north/northwest group with the break along the Pacific Rim at British Columbia. In addition, nested clade phylogeographical analysis, neutrality tests, mismatch distribution analysis, genetic diversities and Mantel test, suggested that the observed genetic structure might have been influenced by contiguous range expansion with restricted gene flow in the direction from south to north along the North American coasts and east to west along the Pacific Rim in the middle to late Pleistocene.

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ORIGINAL PAPER Mitochondrial DNA phylogeography of the harbour porpoise Phocoena phocoena in the North Pacific Mioko Taguchi • Susan J. Chivers • Patricia E. Rosel • Takashi Matsuishi • Syuiti Abe Received: 1 October 2009/Accepted: 5 March 2010/Published online: 24 March 2010 Springer-Verlag 2010 Abstract Genetic structure and phylogeography of the harbour porpoise Phocoena phocoena in the North Pacific were examined using 358 bps sequences from the 50 end of the mitochondrial DNA control region including those reported previously and newly obtained from the west Pacific. AMOVA and pairwise population uST estimates clearly revealed genetic differentiation between an east/ south and a north/northwest group with the break along the Pacific Rim at British Columbia. In addition, nested clade phylogeographical analysis, neutrality tests, mismatch distribution analysis, genetic diversities and Mantel test, suggested that the observed genetic structure might have been influenced by contiguous range expansion with restricted gene flow in the direction from south to north along the North American coasts and east to west along the Pacific Rim in the middle to late Pleistocene. Introduction Many marine species show surprizingly fine genetic differentiation despite their high dispersal ability and the lack of obvious geographical barriers in the marine envi-ronment (Palumbi 1994). Therefore, studies of genetic differentiation in highly mobile organisms with vast dis-tribution ranges like cetacea

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