Genetic divergence in <Emphasis Type="Italic">Ditrema</Emphasis><Emphasis Type="Italic">jordani</Emphasis> (Perciformes: Embiotocidae) from the Pacific coast of southern Japan,as inferred from mitochondrial DNA sequences |
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| Authors: | Hiroshi Katafuchi Yoshiaki Kai Tetsuji Nakabo |
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| Institution: | (1) Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa-Oiwake, Sakyo Kyoto, 606-8502, Japan;(2) Maizuru Fisheries Research Station, Field Science Education and Research Center, Kyoto University, Nagahama, Maizuru Kyoto, 625-0086, Japan;(3) The Kyoto University Museum, Kyoto University, Yoshida, Sakyo Kyoto, 606-8501, Japan;(4) Present address: Environmental Biology Institute Co., Ltd, 3-1 Soura, Ehima-cho, Tahara Aichi, 441-3605, Japan |
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| Abstract: | Genetic divergence in Ditrema jordani was investigated from sequence variations on the mitochondrial cytochrome b gene. Clear genetic differences were found between specimens collected from the Mie and Shizuoka prefectures (westward of
Izu Peninsula) and those from the Kanagawa and Chiba prefectures (eastward of Izu Peninsula). The uncorrected genetic distance
between the two groups, which may represent separate taxa, was much greater (3.1–3.7%) than that between D. temminckii and D. viride (1.1–2.4%), and between two subspecies of D. temminckii (0.8–1.3%), suggesting that the Izu Peninsula acts as a stable geographic barrier to gene flow between the D. jordani groups. The clear genetic divergence between the two geographic populations of D. jordani may be partly related to direct development (viviparity) and low dispersal ability in the genus. |
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