Genetic Monitoring of Threatened Chinook Salmon Populations: Estimating Introgression of Nonnative Hatchery Stocks and Temporal Genetic Changes

Autor: Timothy L. Hoffnagle, Ewann A. Berntson, Robin S. Waples, Paul Moran, Stephen J. Boe, Debra L. Eddy, Donald M. Van Doornik
Rok vydání: 2013
Předmět:
Zdroj: North American Journal of Fisheries Management. 33:693-706
ISSN: 1548-8675
0275-5947
DOI: 10.1080/02755947.2013.790861
Popis: Conservation efforts aimed at Pacific salmon (Oncorhynchus spp.) populations have frequently utilized artificial propagation in an attempt to increase fish abundance. However, this approach carries the risk of unwanted changes in the genetic characteristics of the target population and perhaps others that might incidentally be affected. We used genetic monitoring techniques to estimate the amount of introgression that has occurred from nonnative hatchery stocks into native populations and to determine the extent of genetic changes that have occurred in association with supplementation efforts over the past 20–50 years in Snake River Chinook Salmon O. tshawytscha populations from northeastern Oregon. A total of 4,178 fish from 13 populations were genotyped for 12 microsatellite DNA loci. Expected heterozygosity values for each sample ranged from 0.707 to 0.868. Estimates of the effective number of breeders per year in the naturally spawning populations ranged from 20.6 to 459.1, whereas in the hat...
Databáze: OpenAIRE
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