Introgression of non-native mitochondrial haplotypes from farmed to wild Atlantic salmon

Farmed salmon escape and interbreed with wild Atlantic salmon on a large scale. We studied introgression of mitochondrial haplotypes from farmed Atlantic salmon originating from the Eastern Atlantic phylogenetic group to wild salmon of the Barents-White Sea (BWS) phylogenetic group. We find that far...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Wacker, Sebastian, Bolstad, Geir H., Diserud, Ola H., Hindar, Kjetil, Karlsson, Sten
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2023
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
White Sea
Atlantic salmon
Online Access:http://dx.doi.org/10.1139/cjfas-2023-0044
https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2023-0044
https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2023-0044
Description
Summary:Farmed salmon escape and interbreed with wild Atlantic salmon on a large scale. We studied introgression of mitochondrial haplotypes from farmed Atlantic salmon originating from the Eastern Atlantic phylogenetic group to wild salmon of the Barents-White Sea (BWS) phylogenetic group. We find that farmed genetic introgression introduced novel, non-native haplotypes into the BWS phylogenetic group. The mitochondrial genome has important functional effects and is inherited as a haploid from the mother. Hence, the observed introgression across natural genetic barriers is expected to cause long-lasting functional maladaptation of the hybrids in the maternal line. As the use of farmed Atlantic salmon from non-native phylogenetic groups is widespread in aquaculture, the impact on wild Atlantic salmon may be more severe than previously recognized. Our results highlight the ecological risks of releasing non-native wild and domesticated animals.

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