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Genetic Variation within and Between Domesticated Chinook Salmon, Oncorhynchus tshawytscha, Strains and their Progenitor Populations

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Abstract

Domesticated chinook salmon strains in British Columbia (BC), Canada are believed to have originated primarily from populations of the Big Qualicum (BQ) River and Robertson Creek (RC) on Vancouver Island in the early 1980s. The number of parental fish that gave rise to the domesticated strains and their subsequent breeding history during approximately five ensuing generations of domestication were not documented. Genetic variation at 13 microsatellite loci was examined in samples from two domesticated strains and the two progenitor populations to determine the genetic relationships among them. The domesticated strains had lower allelic diversity and tended to have lower levels of expected heterozygosity than did the BQ and RC progenitor populations. Only three alleles over all 13 loci were detected in the domesticated strains that were not present in the BQ and RC samples, whereas the progenitor strains possessed over 25 (BQ) and 43 (RC) private alleles. Genetic distance and FST values also indicated a closer relationship of the domesticated strains with the BQ than the RC population. One domesticated strain had a significant excess of heterozygosity compared with that expected under conditions of mutation-drift equilibrium, indicative of a recent genetic bottleneck. Genetic differentiation between the domesticated strains was as great as that distinguishing them from the progenitor populations, indicating that the genetic base of domesticated chinook salmon could be increased by hybridization. The existence of genetically distinct domesticated strains of chinook salmon in coastal BC generates the need for an evaluation of potential genetic interactions between domesticated escapees and natural spawning populations.

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Authors and Affiliations

  1. Department of Animal Science, University of British Columbia, Vancouver, BC, Canada

    Ji Eun Kim & Kimberly M. Cheng

  2. Fisheries and Oceans Canada, Pacific Biological Station, Nanaimo, BC, Canada

    Ruth E. Withler

  3. Genetic Data Center, Department of Forest Sciences, University of British Columbia, Vancouver, BC, Canada

    Carol Ritland

Authors
  1. Ji Eun Kim
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  2. Ruth E. Withler
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  3. Carol Ritland
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  4. Kimberly M. Cheng
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Correspondence to Kimberly M. Cheng.

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Eun Kim, J., Withler, R.E., Ritland, C. et al. Genetic Variation within and Between Domesticated Chinook Salmon, Oncorhynchus tshawytscha, Strains and their Progenitor Populations. Environmental Biology of Fishes 69, 371–378 (2004). https://doi.org/10.1023/B:EBFI.0000022891.83210.2e

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  • DOI: https://doi.org/10.1023/B:EBFI.0000022891.83210.2e

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