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

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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.

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Acknowledgments

We acknowledge the valuable comments of two anonymous reviewers on the earlier versions of this manuscript. We also thank to the staff of the Hokkaido Tokyo University Forest for field assistance. This study was supported in part by the Water Resources Environment Center, Japan.

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Authors and Affiliations

  1. Graduate School of Environmental Earth Science, Hokkaido University, N10W5, Sapporo, Hokkaido, 060-0810, Japan

    Sho Fukui, Hirotaka Katahira & Itsuro Koizumi

  2. Department of Zoology, Biodiversity Research Centre and Beaty Biodiversity Museum, University of British Columbia, 6270 University Ave., Vancouver, BC, Canada

    Shannan L. May-McNally

  3. Nagano Environmental Conservation Research Institute, Nagano, 381-0075, Japan

    Satoshi Kitano

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  1. Sho Fukui
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  2. Shannan L. May-McNally
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  3. Hirotaka Katahira
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  4. Satoshi Kitano
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  5. Itsuro Koizumi
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Correspondence to Itsuro Koizumi.

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Guest editors: M. Power, R. Knudsen, C. Adams, M. J. Hansen, J. B. Dempson, M. Jobling & M. Ferguson / Advances in Charr Ecology and Evolution

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Fukui, S., May-McNally, S.L., Katahira, H. et al. Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan. Hydrobiologia 783, 309–316 (2016). https://doi.org/10.1007/s10750-016-2688-8

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  • DOI: https://doi.org/10.1007/s10750-016-2688-8

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