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Genetic diversity in the Snake River sockeye salmon captive broodstock program as estimated from broodstock records

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Abstract

Snake River sockeye salmon spawning in Redfish Lake, Idaho are one of the most endangered taxa of Pacific salmon. The wild population nearly went extinct in the 1990s, and all surviving fish were incorporated into a captive broodstock program at that time. We used pedigree analysis to evaluate the effectiveness of the breeding program in retaining genetic variation from 1991 through 2008. Broodstock records document which males were crossed with which females, but fish from multiple crosses were frequently raised in the same tank so the exact pedigree of the population is unknown. Therefore, a simulation-based approach was used to estimate how much genetic diversity was retained by this breeding program. Results indicate that in 2008, after 5.5 generations of breeding, the average inbreeding coefficient was probably about 0.056. We estimated the inbreeding effective population size to be 41 over the entire program and 115 for the most recent generation. This amount of inbreeding is substantially less than has occurred in many high-profile captive breeding programs. Our results depend on several assumptions regarding the relatedness of fish in the breeding program, but simulations suggest our main results are relatively insensitive to these assumptions.

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Acknowledgments

We thank Dan Baker, Paul Kline and Debbie Frost for assistance in compiling broodstock records. Major funding for this work was provided by NOAA. Additional funding was provided by the National Science Foundation (Grant DEB 0717456 to STK).

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Authors and Affiliations

  1. Department of Ecology, Montana State University, 310 Lewis Hall, Bozeman, MT, 59717, USA

    Steven T. Kalinowski

  2. National Marine Fisheries Service, Northwest Fisheries Science Center, 2725 Montlake Boulevard East, Seattle, WA, 98112, USA

    Donald M. Van Doornik & Robin S. Waples

  3. Idaho Department of Fish & Game, Eagle Fish Genetics Laboratory, 1800 Trout Road, Eagle, ID, 83616, USA

    Christine C. Kozfkay

Authors
  1. Steven T. Kalinowski
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  2. Donald M. Van Doornik
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  3. Christine C. Kozfkay
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  4. Robin S. Waples
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Correspondence to Steven T. Kalinowski.

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Kalinowski, S.T., Van Doornik, D.M., Kozfkay, C.C. et al. Genetic diversity in the Snake River sockeye salmon captive broodstock program as estimated from broodstock records. Conserv Genet 13, 1183–1193 (2012). https://doi.org/10.1007/s10592-012-0363-9

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