Genetic divergence and phylogenetic independence of Far Eastern species in subfamily Leuciscinae (Pisces : Cyprinidae) inferred from mitochondrial DNA analyses

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概要

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• Classification of freshwater fish in the subfamily Leuciscinae, Cyprinidae is hampered by complexity or lack of morphological diversity. In this study, analyses based on mtDNA sequences were undertaken to clarify phylogenetic relationships among Far Eastern, North American and European species in the Leuciscinae. Evolutionary rate in cytochrome b gene (Cyt-b) and D-loop sequences appear to be almost constant in Leuciscinae. The topology of phylogenetic trees generated by neighbor-joining (NJ) and maximum likelihood (ML) methods based on Cyt-b gene and D-loop sequences was similar. Five major clades, designated clades 1–5, and a minor clade were discriminated. Most of the Far Eastern, North American and European species were included in the major clades. Clade 1, comprised almost entirely of Far Eastern phoxinins, is monophyletic and greatly diverged from the other species of Leuciscinae. From the present phylogenetic relationships and the previous studies, we present the following hypotheses with respect to the evolutionary history of the Far Eastern phoxinins. The Far Eastern species should be classified into Far Eastern-specific genera, although ichthyologists have still insisted that the species should be included in the European genera. The Far Eastern clade 1 consists of two subclades, including genera Pseudaspius-Tribolodon and Far Eastern Phoxinus species. According to our phylogenetic analyses, Pseudaspius leptocephalus and Tribolodon species should be reclassified into the same genus. On the basis of evolutionary rate in Cyt-b gene in Cyprinidae, it is estimated that the Far Eastern lineage diverged approximately 10–14 million years ago (mya) from the common ancestor of Leuciscinae. It is deduced that speciation of the Far Eastern species occurred until approximately 4 mya, in relation to the formation of the Sea of Japan and the Japanese Islands.

• 日本遺伝学会の論文
• 2007-08-25

著者

• CHIBA Satoru

  Graduate school of Science and Engineering, Yamagata University

• Chiba Satoru

  Graduate School Of Sci. And Engineering Yamagata Univ.

• SASAKI Takeshi

  Prediction and Knowledge Discovery Research Center, Institute of Statistical Mathematics

• KARTAVTSEV Yuri

  Institute of Marine Biology

• UEMATSU Takayuki

  Graduate School of Science and Engineering, Yamagata University

• SVIRIDOV Vladimir

  Far Eastern State University

• HANZAWA Naoto

  Department of Biology, Faculty of Science, Yamagata University

• Hanzawa Naoto

  Department Of Biology Faculty Of Science Yamagata University

• Hanzawa Naoto

  Graduate School Of Sci. And Engineering Yamagata Univ.

• Uematsu Takayuki

  Graduate School Of Science And Engineering Yamagata University

• Sasaki Takeshi

  Prediction And Knowledge Discovery Research Center Institute Of Statistical Mathematics

関連論文

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• Genetic divergence and phylogenetic independence of Far Eastern species in subfamily Leuciscinae (Pisces : Cyprinidae) inferred from mitochondrial DNA analyses
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