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Genetic Structure of Chum Salmon (Oncorhynchus keta) Populations in the Lower Columbia River: Are Chum Salmon in Cascade Tributaries Remnant Populations?

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Abstract

The lower Columbia River drainage once supported a run of over a million chum salmon. By the late 1950s, the run had decreased to often a few hundred fish. With the exception of Grays River near the coast and an aggregation of chum salmon spawning in creeks and the main stem near Bonneville Dam in the Columbia Gorge, most populations were thought to be extinct. However, chum salmon consistently return in low numbers to tributaries originating in the Cascade Range: the Cowlitz, Lewis, and Washougal rivers. To assess whether Cascade spawners were strays or remnants of former populations, chum salmon from the Coastal, Cascade and Gorge ecoregional zones were characterized at 17 microsatellite loci. Significant heterogeneity in genotype distributions was detected between zones and collections formed regional groups in a neighbor-joining tree. Cascade collections had higher allelic richness and private alleles, and the Cowlitz River supported genetically divergent fall and summer runs, the only summer chum salmon run extant in the Columbia River drainage. We propose that chum salmon in the Cascade zone are remnants of original populations. We attribute the divergence between zonal groups to diverse ecological conditions in each zone, which promoted regional genetic adaptation, and to genetic drift experienced in small populations.

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Authors and Affiliations

  1. Genetics Laboratory, Conservation Biology Unit, Washington Department of Fish and Wildlife, Olympia, WA, USA, 98501

    Maureen P. Small, A. E. Frye, J. F. Von Bargen & S. F. Young

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  1. Maureen P. Small
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  2. A. E. Frye
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  3. J. F. Von Bargen
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  4. S. F. Young
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Correspondence to Maureen P. Small.

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Small, M.P., Frye, A.E., Von Bargen, J.F. et al. Genetic Structure of Chum Salmon (Oncorhynchus keta) Populations in the Lower Columbia River: Are Chum Salmon in Cascade Tributaries Remnant Populations?. Conserv Genet 7, 65–78 (2006). https://doi.org/10.1007/s10592-005-7967-2

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  • DOI: https://doi.org/10.1007/s10592-005-7967-2

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