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Genetic differentiation in gill raker number and length in sympatric anadromous and nonanadromous morphs of sockeye salmon, Oncorhynchus nerka

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Abstract

The genetic and environmental basis for polymorphism in gill raker number and length in sympatric anadromous and nonanadromous morphs of sockeye salmon, Oncorhynchus nerka, was investigated. Analysis of 30 full sib families involving pure types and reciprocal hybrids revealed that the variation was partitioned significantly among families within cross types and among cross types in both traits. As in the wild, kokanee displayed more gill rakers than sockeye; reciprocal hybrids displayed intermediate counts. Gill raker length also varied markedly among cross types, with pure sockeye displaying 19% longer gill rakers than comparable sized kokanee. This difference was in the opposite direction predicted, given the common positive association between gill raker number and length in sympatric morphs of the same species in fishes. Gill raker number and length were generally not correlated within cross types, suggesting independent divergence of the traits. The results are discussed in relation to genetic and trophic divergence of the morphs and to factors selecting for differentiation in the two gill raker traits.

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  1. School of Fisheries, University of Washington, Box 357980, Seattle, WA, 98195, U.S.A. (e-mail

    Chris J. Foote, Kelly Moore, Karl Stenberg, Kevin J. Craig & John K. Wenburg

  2. Pacific Biological Station, Canadian Department of Fisheries and Oceans, Nanaimo, B.C, V9R 5K6, Canada

    Chris C. Wood

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  1. Chris J. Foote
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Foote, C.J., Moore, K., Stenberg, K. et al. Genetic differentiation in gill raker number and length in sympatric anadromous and nonanadromous morphs of sockeye salmon, Oncorhynchus nerka. Environmental Biology of Fishes 54, 263–274 (1999). https://doi.org/10.1023/A:1007548807233

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