“…Intermediate migration patterns, often observed in hybrids (Moore et al, 2010;Pujolar et al, 2014), may also result in underrepresentation of hybrids in our samples. This contrasts with evidence of adaptation in cod that is either temporally unstable (Poulsen et al, 2011;Therkildsen, Hemmer-Hansen, Als, et al, 2013;Therkildsen, Hemmer-Hansen, Hedeholm, et al, 2013) or if temporally stable, it is linked to chromosomal rearrangements (e.g., inversions) as seen in the differentiation between migratory and stationary cod ecotypes (Berg et al, 2016;Kirubakaran et al, 2016) shown to be present on both sides of the Atlantic Ocean (Berg et al, 2017). This contrasts with evidence of adaptation in cod that is either temporally unstable (Poulsen et al, 2011;Therkildsen, Hemmer-Hansen, Als, et al, 2013;Therkildsen, Hemmer-Hansen, Hedeholm, et al, 2013) or if temporally stable, it is linked to chromosomal rearrangements (e.g., inversions) as seen in the differentiation between migratory and stationary cod ecotypes (Berg et al, 2016;Kirubakaran et al, 2016) shown to be present on both sides of the Atlantic Ocean (Berg et al, 2017).…”