Phylogeography of the endangered tideland snail Batillaria zonalis in the Japanese and Ryukyu Islands |
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| Authors: | Shigeaki Kojima Satomi Kamimura Akiko Iijima Taeko Kimura Keisuke Mori Ikuo Hayashi Toshio Furota |
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| Institution: | (1) Ocean Research Institute, University of Tokyo, Tokyo 164-8639, Japan;(2) Faculty of Science, University of the Ryukyus, Okinawa 903-0129, Japan;(3) Faculty of Science, Toho University, Chiba 274-8510, Japan;(4) Faculty of Bioresources, Mie University, Mie 514-8507, Japan;(5) Amakusa Marine Biological Laboratory, Kyushu University, Kumamoto 863-2507, Japan;(6) Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Niigata 951-8121, Japan;(7) Present address: National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Hiroshima 739-0452, Japan;(8) Present address: Wetlands International Japan, Tokyo 160-0023, Japan |
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| Abstract: | The phylogeography of the endangered tideland snail Batillaria zonalis in the Japanese and Ryukyu Islands was analyzed on the basis of nucleotide sequences of a mitochondrial gene for cytochrome oxidase c subunit I (COI). Extremely low genetic diversity was found in populations at both the northern and southern boundaries of the geographic distribution of this species in Japan, i.e., Sendai Bay and Iriomotejima Island, respectively, which might be attributed to the population bottleneck due to historical environmental variations and/or the recent foundation of populations in the marginal part of the inhabitable range. Most populations contained unique rare haplotypes, and significant genetic differentiation on the whole was shown, while no clear geographic genetic structure was detected between the Japanese and Ryukyu Islands or over the distribution area of B. zonalis in Japan, with the exception of significant genetic divergences in Ago Bay in the central part of Honshu and the southern part of Okinawajima Island. |
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| Keywords: | Batillaria zonalis Endangered species Genetic diversity Mitochondrial DNA Phylogeography |
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