Genetic Differentiation of Sockeye Salmon Subpopulations from a Geologically Young Alaskan Lake System
- 1 November 1997
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 126 (6) , 926-938
- https://doi.org/10.1577/1548-8659(1997)126<0926:gdosss>2.3.co;2
Abstract
The Tustumena Lake drainage in southcentral Alaska is glacially turbid and geologically young (<2,000 years old). Previous field studies identified at least three subpopulations of sockeye salmon Oncorhynchus nerka at Tustumena Lake, based on the distribution and timing of spawners. The subpopulations included early-run salmon that spawned in six clearwater tributaries of the lake (mid August), lake shoreline spawners (late August), and late-run fish that spawned in the lake's outlet, the Kasilof River (late September). Our objective was to determine the degree of genetic differentiation among these subpopulations based on restriction enzyme analyses of the cytochrome b gene of mitochondrial DNA and analyses of four polymorphic allozyme loci. Mitochondrial DNA haplotype frequencies for outlet-spawning sockeye salmon differed significantly from those of all other subpopulations. The most common (36%) haplotype in the outlet subpopulation did not occur elsewhere, thus suggesting little or no gene f...Keywords
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