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Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan

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タイトル: Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan
著者: Fukui, Sho 著作を一覧する
May-McNally, Shannan L. 著作を一覧する
Katahira, Hirotaka 著作を一覧する
Kitano, Satoshi 著作を一覧する
Koizumi, Itsuro 著作を一覧する
キーワード: Hybrid swarm
Invasive species
Rainbow trout
発行日: 2016年12月
出版者: Springer
誌名: Hydrobiologia
巻: 783
号: 1
開始ページ: 309
終了ページ: 316
出版社 DOI: 10.1007/s10750-016-2688-8
抄録: Introductions of non-native species have caused various negative impacts on native species and their ecosystems. Hybridization is particularly prevalent among closely related species, and can result in displacement, hybrid swarms, or the disruption of a locally adapted gene complex. Although hybridization between native and non-native species is widespread, long-term monitoring is generally lacking. In this study, we compared the distribution and composition of native white-spotted charr (Salvelinus leucomaenis), introduced brook trout (Salvelinus fontinalis), and their hybrids in the upper Sorachi River, Hokkaido, Japan in 2003 and 2013, especially focusing on (1) if genetic introgression or hybrid swarm has occurred and (2) if white-spotted charr have declined, since a previous study indicated a potentially harmful asymmetric hybridization with the mothers of hybrids being all white-spotted charr. We found no evidence of decline in native white-spotted charr; rather, the distribution and abundance of introduced brook trout had decreased. Of 142 charr (i.e., genus Salvelinus) collected, 18 individuals (13%) were hybrids but no unidirectional hybridization was observed. However, most of the hybrids were post-F1 individuals with biased mating with white-spotted charr. The effects of long-term introgression on native white-spotted charr should be further examined.
Rights: The final publication is available at
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 小泉 逸郎


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