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SNPs reveal previously undocumented non-native introgression within threatened trout populations

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Abstract

Two questions relevant to the management of species threatened by introgressive hybridization are whether results from different genetic marker are comparable, and whether all sources of introgression have been identified. We used recently-developed SNP markers to quantify introgression from two non-native taxa: rainbow trout (Oncorhynchus mykiss) and cutthroat trout of the Yellowstone evolutionary lineage (O. clarkii subspp.), into populations of threatened Lahontan cutthroat trout (O. c. henshawi). Results for O. mykiss introgression largely agreed with those of previous studies using different genetic markers. However, three populations contained much genetic material from the Yellowstone lineage, a source of introgression not previously examined. This included one population proposed to be a remnant of an extinct cutthroat trout lineage.

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Acknowledgments

This research was funded by the US Fish and Wildlife Service (Lahontan National Fish Hatchery Complex and the Abernathy Fish Technology Center) and National Oceanic and Atmospheric Administration (Southwest Fisheries Science Center; SWFSC). We are grateful to N. Campbell and J. Metcalf for providing reference samples, and to V. Kirchoff and members of the SWFSC Molecular Ecology and Genetic Analysis Team for laboratory assistance. Comments from the editor and three anonymous referees improved the manuscript.

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  1. Victoria L. Pritchard

    Present address: Division of Genetics and Physiology, Department of Biology, University of Turku, 20014, Turku, Finland

Authors and Affiliations

  1. Southwest Fisheries Science Center, National Marine Fisheries Service, 110 Shaffer Road, Santa Cruz, CA, 95060, USA

    Victoria L. Pritchard & John Carlos Garza

  2. Department of Biology, University of Nevada, Mail Stop 314, Reno, NV, 89557, USA

    Mary M. Peacock

Authors
  1. Victoria L. Pritchard
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  2. John Carlos Garza
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  3. Mary M. Peacock
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Correspondence to Victoria L. Pritchard.

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Pritchard, V.L., Garza, J.C. & Peacock, M.M. SNPs reveal previously undocumented non-native introgression within threatened trout populations. Conserv Genet 16, 1001–1006 (2015). https://doi.org/10.1007/s10592-015-0712-6

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  • DOI: https://doi.org/10.1007/s10592-015-0712-6

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