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Two Kinorhynch Species (Cyclorhagida, Echinoderidae,Echinoderes) Show Different Distribution Patterns Across Tsugaru Strait, Northern Japan

ZS31-7 421-429.pdf1.77 MBPDF見る/開く

タイトル: Two Kinorhynch Species (Cyclorhagida, Echinoderidae,Echinoderes) Show Different Distribution Patterns Across Tsugaru Strait, Northern Japan
著者: Yamasaki, Hiroshi 著作を一覧する
Hiruta, Shimpei F. 著作を一覧する
Kajihara, Hiroshi 著作を一覧する
Dick, Matthew H. 著作を一覧する
キーワード: dispersal barrier
intertidal organism
population history
発行日: 2014年 7月 1日
出版者: Zoological Society of Japan
誌名: Zoological Science
巻: 31
号: 7
開始ページ: 421
終了ページ: 429
出版社 DOI: 10.2108/zs140011
抄録: We investigated the geographic population structures of two intertidal kinorhynch species, Echinoderes sensibilis and Echinoderes sp. A, in the vicinity of Tsugaru Strait between Honshu and Hokkaido Islands, Japan, to examine whether the distribution or connectivity of populations of either species has been constrained by the strait. For each species, we examined the geographic distribution of COI haplotypes, constructed a median-joining haplotype network, and calculated statistics of genetic variation and connectivity. Tsugaru Strait is the northern range limit for E. sensibilis, which comprises a large, evolutionarily stable metapopulation that appears to have undergone a reduction in size followed by expansion; connectivity is low among most local populations, including across Tsugaru Strait. A divergent haplotype lineage showing no variation occurred only at Horozuki, suggesting recent immigration there from outside the study area. Echinoderes sp. A underwent a severe population bottleneck followed by rapid expansion. It occurred at all sampling sites on both sides of the strait, with high connectivity between populations across the strait. There is a zone of secondary contact between moderately divergent, presumably previously allopatric lineages in eastern Hokkaido. Present-day conditions in the strait have existed only for the past 8000 years, and differences in these species’ distributions and apparent connectivity across the strait may relate to conditions existing in the strait when the species underwent population expansions or shifts in range; these historical events were not necessarily concurrent between the species, and occurred more than 8000 years ago. We discuss dispersal mechanisms for kinorhynchs, which could include suspension transport or rafting.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: Matthew Hill Dick


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