Genomic Insights into Local Adaptation and Migration Success in Reintroduced Coho Salmon of the Wenatchee River Basin
Abstract
Reintroduction of salmonids into regions where they have been extirpated is a common conservation strategy that is often implemented through natural recolonization, translocation of natural populations, or hatchery-based programs. Locally adapting to specific environmental conditions is critical for long-term population viability, particularly for species like Coho Salmon Oncorhynchus kisutch, which face diverse selective pressures during their migration. This study focused on the mid-Columbia River Coho Salmon reintroduction program managed by Yakama Nation Fisheries, which has successfully reintroduced Coho Salmon into the Wenatchee and Methow River basins, Washington. Notably, these populations have adapted to the longer migration route than those in the founding stock, with selection favoring individuals with an earlier arrival time and that can navigate a 15-km, high-gradient canyon to reach optimal spawning grounds. The objectives of this study were to investigate whether specific genomic regions are under selection for traits associated with return location and timing in Coho Salmon.
Authors
Citation
Horn, R.L., J. Caisman, C. Kamphaus, and S.R. Narum. 2025. Genomic insights into local adaptation and migration success in reintroduced Coho Salmon of the Wenatchee River basin. Transactions of the American Fisheries Society vnaf019. Online at https://doi.org/10.1093/tafafs/vnaf019.