We first assembled a 490-Mbp draft genome of M. In this study, we examined how demographic history, shared ancestral polymorphism, and gene flow among glacial lineages contribute to local adaptation to sea conditions in a marine fish, the capelin (Mallotus villosus). However, our understanding of the evolutionary mechanisms impending or favouring local adaptation in the presence of gene flow is still limited to a restricted number of study systems. Furthermore, structural variation as chromosomal rearrangements may facilitate adaptation despite high gene flow. Gene flow has tremendous importance for local adaptation, by influencing the fate of de novo mutations, maintaining standing genetic variation and driving adaptive introgression. 9 Labrador Institute of Memorial University of Newfoundland, Happy Valley-Goose Bay, NL, Canada.8 Center for Fisheries Ecosystems Research, Fisheries and Marine Institute of Memorial, University of Newfoundland, St.7 Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway.6 DTU Aqua-National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund Castle, Charlottenlund, Denmark.5 GINR-Greenland Institute of Natural Resources, Nuuk, Greenland.4 Fisheries and Oceans Canada, Institut Maurice-Lamontagne, Mont-Joli, QC, Canada.3 Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada.2 Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway. 1 Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Quebec City, QC, Canada.
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