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

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Title: Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan
Authors: Fukui, Sho Browse this author
May-McNally, Shannan L. Browse this author
Katahira, Hirotaka Browse this author
Kitano, Satoshi Browse this author
Koizumi, Itsuro Browse this author →KAKEN DB
Keywords: Hybrid swarm
Introgression
Invasive species
Rainbow trout
Microsatellite
mtDNA
Issue Date: Dec-2016
Publisher: Springer
Journal Title: Hydrobiologia
Volume: 783
Issue: 1
Start Page: 309
End Page: 316
Publisher DOI: 10.1007/s10750-016-2688-8
Abstract: 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 link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/67900
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小泉 逸郎

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