Genetic Variation in Steelhead of Oregon and Northern California
- 1 March 1992
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 121 (2) , 158-169
- https://doi.org/10.1577/1548-8659(1992)121<0158:gvisoo>2.3.co;2
Abstract
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 t...Keywords
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