Genetic Differentiation and Hybridization between Hatchery Stock and Native Brook Trout in Great Smoky Mountains National Park.

摘要

Starch gel electrophoresis was used to examine the protein products of 34 presumptaive lock in 9 populations of brook trout Salvelinus fontinalis from Great Smoky Mountains National Park and in two brook trout hatchery strains derived from northeastern U.S. populations and used extensively for stocking in the Southern Appalachians. Five of the streams sampled were not stocked and presumably contain only native brook trout. Three other streams contained native populations which had been stocked, and the remaining stream originally was devoid of natives and presumably contains only introduced brook trout. The results are consistent with previous studies suggesting that native brook trout in the southeastern United States may be taxonomically distinct. Genotypes at diagnostic loci demonstrate that introgressive hybridization has occurred between hatchery and native trout in all three stocked populations.