期刊
EVOLUTIONARY APPLICATIONS
卷 14, 期 5, 页码 1450-1460出版社
WILEY
DOI: 10.1111/eva.13213
关键词
aquaculture; Atlantic salmon; farmed salmon; genetic introgression; Salmo salar; survival
资金
- Grieg Seafood Finnmark AS
- NRS Farming AS Region Finnmark
- Cermaq Norway AS Region Finnmark
- Norwegian Directorate for Nature Management
- Statkraft AS
- Norwegian Institute for Nature Research
- Norwegian Directorate of Fisheries
- Alta Salmon Fishery Partnership (ALI)
The study found that genetic introgression from escaped farmed salmon negatively impacts the survival rate of wild Atlantic salmon in a river in northern Norway, leading to a decrease in population-level genetic introgression. This suggests that there is natural selection against genetic introgression in the wild, potentially resulting in lower productivity.
The viability of wild Atlantic salmon populations is threatened by genetic introgression from escaped farmed salmon. Farmed Atlantic salmon are genetically improved for important commercial traits and a life in captivity but are poorly adapted to the natural environment. The rate of gene flow from escaped farmed to wild salmon depends on their spawning success and on offspring survival at various life stages. We here investigate relative survival of introgressed juvenile Atlantic salmon (parr) in a river in northern Norway. The studied population has experienced genetic introgression from farmed salmon for about four generations (20 years). We followed two cohorts of parr from the year of hatching (0+) to the age of 2 years (2+). Farmed genetic introgression was quantified at the individual level and on a continuous scale using diagnostic SNPs. Population-level genetic introgression decreased from 0+ to 2+ by 64% (2011 cohort) and 37% (2013 cohort). This change was driven by a 70% (2011 cohort) and 49% (2013 cohort) lower survival from age 0+ to 2+ in introgressed parr compared to parr of wild origin. Our observations show that there is natural selection against genetic introgression with a potential cost of lower productivity.
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