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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Acknowledgments
We are grateful to the following for help in collecting specimens: K. Sakai (Noto Marine Center), K. Matsuda (Mie Prefectural Science and Technology Promotion Center), K. Hayama and M. Fukumoto (MARUSE), S. Masuda (Kawasaki Fish Market, Ltd.), S. Ito (Chiba Pref.), H. Kawashima and S. Kawabata (Shizuoka Pref.), R. Doiuchi (Fisheries Experimental Station, Wakayama Prefectual Research Center of Agriculture, Forestry and Fisheries), J.K. Kim (NFRDI), T. Wada, Y. Fukunishi and K. Matsuda (Kyoto University), M. Aritaki and M. Nakagawa (National Center for Stock Enhancement, Fisheries Research Agency). We thank K. Hagiwara (Yokosuka City Museum) for information on collecting specimens and H. Kishimoto (Tokai University) for providing the use of laboratory facilities. We are also much indebted to K. Nakayama (Kyoto University) and R. Doiuchi, who give advice on molecular techniques, and G.S. Hardy (Ngunguru, New Zealand), who read the initial manuscript and offered helpful comments. This study was supported in part by a Grant-in-Aid for Scientific Research (B) from Japan Society for the Promotion of Science (JSPS) (20370034).
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Katafuchi, H., Kai, Y. & Nakabo, T. Genetic divergence in Ditrema jordani (Perciformes: Embiotocidae) from the Pacific coast of southern Japan, as inferred from mitochondrial DNA sequences. Ichthyol Res 58, 90–94 (2011). https://doi.org/10.1007/s10228-010-0190-2
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DOI: https://doi.org/10.1007/s10228-010-0190-2