A population genetic study on the relationship between medaka fish and the spread of wet-rice cultivation across the Japanese archipelago

Takafumi Katsumura, Shoji Oda, Kentaro Tsukamoto, Yoshio Sekiya, Toshikazu Yamashita, Masanori Aso, Masayoshi Hata, Masaru Nonaka, Shuhei Mano, Hajime Ishida, Hiroshi Mitani, Shoji Kawamura, Hiroki Oota

研究成果: Article

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It has been generally thought that a tiny freshwater fish, medaka (Oryzias latipes), has expanded its habitat into the Japanese archipelago as wet-rice cultivation spread across the region, and hence the distribution of medaka should be a matter of anthropological interest. However, there has been no study to verify this popular belief. To address the issue, we sampled wild medaka, and undertook genetic analyses of its populations. We collected 976 individual medaka from 13 local wild sites, which included 11 paddy-field irrigation channels and two ponds. The gene tree constructed based on nucleotide sequences of mitochondrial genome D-loop region showed no discrepancy in the topology, which is presumed to reflect the northern Kyushu origin of the southern Japanese medaka. Population genetic statistics indicated that the medaka populations in west Japan have greater genetic diversity (heterozygosity) than those in east Japan, supporting the hypothesis that the medaka originate from northern Kyushu. Hence, we argue that the current medaka distribution can be attributed to their past migration event(s) following the expansion of paddy fields from northern Kyushu to the eastern part of the Japanese archipelago.

元の言語English
ページ(範囲)81-89
ページ数9
ジャーナルAnthropological Science
120
発行部数1
DOI
出版物ステータスPublished - 27-04-2012

All Science Journal Classification (ASJC) codes

  • Anthropology

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    Katsumura, T., Oda, S., Tsukamoto, K., Sekiya, Y., Yamashita, T., Aso, M., Hata, M., Nonaka, M., Mano, S., Ishida, H., Mitani, H., Kawamura, S., & Oota, H. (2012). A population genetic study on the relationship between medaka fish and the spread of wet-rice cultivation across the Japanese archipelago. Anthropological Science, 120(1), 81-89. https://doi.org/10.1537/ase.110525