Selection against individuals from genetic introgression of escaped farmed salmon in a natural population of Atlantic salmon.

Autor: Wacker S; Norwegian Institute for Nature Research Trondheim Norway., Aronsen T; Norwegian Institute for Nature Research Trondheim Norway., Karlsson S; Norwegian Institute for Nature Research Trondheim Norway., Ugedal O; Norwegian Institute for Nature Research Trondheim Norway., Diserud OH; Norwegian Institute for Nature Research Trondheim Norway., Ulvan EM; Norwegian Institute for Nature Research Trondheim Norway., Hindar K; Norwegian Institute for Nature Research Trondheim Norway., Næsje TF; Norwegian Institute for Nature Research Trondheim Norway.
Jazyk: angličtina
Zdroj: Evolutionary applications [Evol Appl] 2021 Mar 27; Vol. 14 (5), pp. 1450-1460. Date of Electronic Publication: 2021 Mar 27 (Print Publication: 2021).
DOI: 10.1111/eva.13213
Abstrakt: 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.
Competing Interests: 5None declared.
(© 2021 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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