著者

Nishi Hirotaka Sota Teiji

出版者

Zoological Society of Japan

雑誌

Zoological Science (ISSN:02890003)

巻号頁・発行日

vol.24, no.5, pp.475-485, 2007-05

被引用文献数

9

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We studied genetic variation within the Japanese land snail Euhadra herklotsi, which occurs on Kyushu and the surrounding islands, using partial sequences of the mitochondrial COI gene and nuclear ITS2 genes. The phylogenetic analysis revealed the existence of two major clades: clade N in the north and clade S in the south. These clades were parapatric and overlapped in southern Kyushu. Genetic divergence was high in clade N, whereas it was much lower in clade S. In addition, isolation-by-distance within each clade was implied. Since no current geographical barriers separate these clades, the genetic structure of clade S might have been influenced by historical events, such as volcanic activity, and a resulting population bottleneck followed by range expansion. The genital characteristics of clade-S snails were distinct from those of clade-N snails, and snails in both clades were sympatric at one locality. The shells of clade-N snails were generally larger than those of clade-S snails, but the shell-size variation within each clade could not be explained simply by environmental variables. Our study suggests that E. herklotsi likely consists of two sibling species. The taxonomic status of the previously proposed subspecies of E. herklotsi and related species requires reassessment.

著者

Ikeda Hiroshi Nishikawa Masaaki Sota Teiji

出版者

Nature Publishing Group

雑誌

Nature Communications (ISSN:20411723)

巻号頁・発行日

vol.3, pp.648, 2012-01-31

被引用文献数

108

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甲虫の種多様化要因の新説~飛翔能力の退化が種分化を促進. 京都大学プレスリリース. 2012-02-01.

著者

Nishi Hirotaka Sota Teiji

出版者

日本動物学会

雑誌

Zoological Science (ISSN:02890003)

巻号頁・発行日

vol.24, no.5, pp.475-485, 2007-05

---

We studied genetic variation within the Japanese land snail Euhadra herklotsi, which occurs on Kyushu and the surrounding islands, using partial sequences of the mitochondrial COI gene and nuclear ITS2 genes. The phylogenetic analysis revealed the existence of two major clades: clade N in the north and clade S in the south. These clades were parapatric and overlapped in southern Kyushu. Genetic divergence was high in clade N, whereas it was much lower in clade S. In addition, isolation-by-distance within each clade was implied. Since no current geographical barriers separate these clades, the genetic structure of clade S might have been influenced by historical events, such as volcanic activity, and a resulting population bottleneck followed by range expansion. The genital characteristics of clade-S snails were distinct from those of clade-N snails, and snails in both clades were sympatric at one locality. The shells of clade-N snails were generally larger than those of clade-S snails, but the shell-size variation within each clade could not be explained simply by environmental variables. Our study suggests that E. herklotsi likely consists of two sibling species. The taxonomic status of the previously proposed subspecies of E. herklotsi and related species requires reassessment.

著者

Sota Teiji Yamamoto Satoshi Cooley John R Hill Kathy B R Simon Chris Yoshimura Jin

出版者

National Academy of Sciences

雑誌

Proceedings of the National Academy of Sciences of the United States of America (ISSN:10916490)

巻号頁・発行日

2013-03-18

被引用文献数

48

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昆虫で最も不思議な生活史を持つ北米の周期ゼミの進化史を解明. 京都大学プレスリリース. 2013-03-19.