Abstract
Population structure of sockeye salmon Oncorhynchus nerka in Barkley Sound, British Columbia, Canada was examined by analysis of microsatellite variation at 14 loci in three populations sampled in each of 3 years. The mean FST over all 14 loci was 0·063. Differences among populations accounted for 12 times the variation observed among years within populations. The number of alleles present at a locus was related to the power of the locus to provide accurate identification of individuals to population. The more alleles that were present at a locus, the greater was the power of the locus for individual identification. Individuals were correctly classified to one of three lakes of origin at a rate of 89%, and to one of two river drainages at a rate of 96%.
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