|Document Type:||Journal Article|
|Title:||Genetic monitoring of threatened Chinook salmon populations: estimating introgression of non-native hatchery stocks and temporal genetic changes|
|Author:||Donald M. Van Doornik, Debra L. Eddy, Robin S. Waples, Stephen J. Boe, E. A. Berntson, Paul Moran|
|Journal:||North American Journal of Fisheries Management|
|Keywords:||genetic monitoring,Oncorhynchus tshawytscha|
The history of Pacific salmon (Oncorhynchus spp.) conservation efforts is replete with attempts to mitigate habitat loss and increase their abundance by supplementation with artificial propagation. However, this approach carries the risk of unwanted changes in genetic characteristics of the target population, and perhaps others that might incidentally be affected. We used genetic monitoring techniques involving DNA microsatellite markers to estimate the amount of introgression that has occurred from non-native 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 7 Snake River Chinook salmon populations from northeast Oregon. We found that introgression from one hatchery stock was particularly noticeable in the early 1990s, but it appears to have had a lasting effect on only two of the native populations, despite the ample opportunities that existed for introgression to occur. All seven of the native populations sampled have maintained their levels of within population genetic diversity throughout the sampling period.
This paper describes the results of a 20 year genetic monitoring program of Chinook samon in the Grande Ronde and Imnaha river basins in northeast Oregon.
|Theme:||Recovery, Rebuilding and Sustainability of Marine and Anadromous Species|
Maximize effectiveness and minimize impacts of artificial propagation in recovery, rebuilding and stock sustainability