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Genetic variation in steelhead of Oregon and northern California

January 1, 1992

Steelhead Oncorhynchus mykiss from various sites between the Columbia River and the Mad River, California, were genetically characterized at 10 protein-coding loci or pairs of loci by starch gel electrophoresis. Fish from coastal streams differed from fish east of the Cascade Mountains and from fish of the Willamette River (a tributary of the Columbia River, west of the Cascade Mountains). Coastal steelhead from the northern part of the study area differed from those in the southern part. Genetic differentiation within and among drainages was not statistically significant; however, gene diversity analysis and the life history of steelhead suggested that fish from different drainages should be considered as separate populations. Genetic variation among fish in separate drainages was similar to that reported in northwestern Washington and less than that reported in British Columbia. Allele frequencies varied significantly among year-classes. Genetic variation within samples accounted for 98.3% of the total genetic variation observed in this study. Most hatchery populations differed from wild populations, suggesting that conservation of genetic diversity among and within wild populations could be facilitated by altering hatchery programs.

Citation Information

Publication Year 1992
Title Genetic variation in steelhead of Oregon and northern California
DOI 10.1577/1548-8659(1992)121<0158:GVISOO>2.3.CO;2
Authors R.R. Reisenbichler, J.D. McIntyre, M.F. Solazzi, S.W Landino
Publication Type Article
Publication Subtype Journal Article
Series Title Transactions of the American Fisheries Society
Index ID 70180688
Record Source USGS Publications Warehouse
USGS Organization Western Fisheries Research Center