Phylogeography of White-Spotted Charr (Salvelinus leucomaenis) Inferred from Mitochondrial DNA Sequences

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概要

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• The white-spotted charr (Salvelinus leucomaenis) is a coldwater-adapted fish distributed in far-eastern Asia. To assess phylogeographic patterns of this species over most of its range in the Japanese archipelago and Sakhalin Island, Russia, we examined nucleotide sequences of the mitochondrial DNA (mtDNA) cytochrome b region (557 bp) in 141 individuals from 50 populations. A total of 33 (5.5%) nucleotide positions were polymorphic and defined 29 haplotypes. Phylogenetic analysis assigned the observed haplotypes to four main clades, which were characterized by the idiosyncrasies and discontinuity of geographic distributions. The nested clade analyses revealed that the geographical distribution patterns of some haplotypes and clades were explained by historical event such as past fragmentation. Although substantial genetic differentiation was found among the four main clades, their geographic distributions overlapped extensively in several regions. Since white-spotted charr can potentially use both freshwater and marine environments, coexistence among different lineages can be attributed to secondary contact through range expansion by migratory individuals during multiple glacial periods after interglacial isolation. Finally, our data demonstrate that the current subspecies designation does not reflect the phylogeography of this species based on mtDNA analysis. Hierarchical analysis (AMOVA) also showed that genetic variation was far more pronounced within subspecies than among subspecies (i.e., among discrete regions). These results suggest that each population, rather than each subspecies, must be treated as an evolutionarily significant unit.

• 社団法人日本動物学会の論文
• 2004-02-25

著者

• 前川 光司

  北大 北方生物圏フィルード科セ

• 前川 光司

  森林生物管理学部門主任

• 前川 光司

  北海道大学演習林

• 前川 光司

  北海道大学歯学部口腔解剖学第一教室

• 前川 光司

  北海道大学農学部附属演習林雨龍地方演習林

• Morita Kentaro

  Ocean Research Institute University Of Tokyo

• YAMAMOTO SHOICHIRO

  National Research Institute of Fisheries Science, Fisheries Research Agency

• Watanabe Katsutoshi

  Graduate School Of Science Kyoto University

• Kitano Satoshi

  Nagano Nature Conservation Research Institute

• Koizumi Itsuro

  Field Science Center for Northern Biosphere, Hokkaido University

• Maekawa Koji

  Field Science Center for Northern Biosphere, Hokkaido University

• Takamura Kenji

  National Institute for Environmental Studies

• Maekawa K

  National Research Institute Of Fisheries Science

• Maekawa K

  Laboratory Of Boreal Forest Conservation Field Science Center For Northern Biosphere Hokkaido Univer

• Maekawa Koji

  Hokkaido Univ. Sapporo Jpn

• Maekawa Koji

  Laboratory Of Conservation Biology Field Science Center For Northern Biosphere Hokkaido University

• Koizumi I

  Division Of Environmental Science Development Graduate School Of Environmental Science Hokkaido Univ

• Kitano Satoshi

  Nagano Environmental Conservation Research Institute

• Maekawa K

  Hokkaido Univ. Sapporo Jpn

• Maekawa K

  Hokkaido Univ. Hokkaido Jpn

• Yamamoto S

  National Research Institute Of Fisheries Science Fisheries Research Agency

• Yamamoto Shoichiro

  National Research Institute Of Fisheries Science

• Maekawa Koji

  Field Science Center For North Biosphere Hokkaido University

• YAMAMOTO Shoichiro

  National Research Institute of Aquaculture, Fisheries Research Agency

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