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The Journal of Heredity 2001:92(2)
© 2001 The American Genetic Association 92:127-136

Kinship Analysis of Pacific Salmon: Insights Into Mating, Homing, and Timing of Reproduction

P. Bentzen, J. B. Olsen, J. E. McLean, T. R. Seamons, and T. P. Quinn

From the Marine Molecular Biotechnology Laboratory (Bentzen, McLean, and Seamons), School of Aquatic and Fishery Sciences (Quinn), University of Washington, Box 355020 Boat St., Seattle, WA 98105, and Gene Conservation Laboratory, Alaska Department of Fish and Game, Anchorage, Alaska (Olsen).

Address correspondence to Paul Bentzen at the address above or e-mail: pbentzen{at}u.washington.edu.

Multilocus microsatellite genotypes were used to infer kinship and relatedness in two species of Pacific salmon from three populations in Washington State. Even in the absence of direct genetic data from parents, clustering of individuals according to allele sharing and reconstruction of parental genotypes allowed resolution of full- and half-sib relationships among 135 chinook salmon (Oncorhynchus tshawytscha) sampled as preemergent juveniles from 14 redds in the Dungeness River. Inferred reproductive behaviors included single-pair matings, polyandry in which females mated with two to three males at a single redd, polygyny in which males mated with two females at different redds, use of two redds by a single female, and use of one redd site by two females. Greater average relatedness (rxy) in the upper reach of the Dungeness River implied within-reach homing of returning adults. In steelhead trout (O. mykiss), the frequency of related pairs (dyads) of mature individuals that migrated up Snow Creek less than a week apart was greater than expected for randomly chosen dyads, as was the frequency of steelhead dyads that were spawned on the same day in the Forks Creek hatchery. These results imply a heritable basis for upstream migration date and maturation date in steelhead trout.


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