The evolutionary consequences for seawater performance and its hormonal control when anadromous Atlantic salmon become landlocked.

ABSTRACT: Populations of anadromous fish have become landlocked in relatively recent geological history (<14,000 years), but the evolutionary impacts of this altered lifecycle on traits underlying seawater performance have not been established. In order to examine the effects of relaxed selection on seawater traits, anadromous and landlocked Atlantic salmon were reared under identical conditions and examined for differences in seawater performance and its underlying physiological and endocrine control during the time of spring downstream migration. Salinity tolerance, survival and initial growth in seawater were greater in anadromous than in landlocked salmon. Abundance of the seawater isoform of gill Na⁺/K⁺-ATPase increased in spring in both strains but was greater in anadromo

SUBMITTER: McCormick SD 

PROVIDER: S-EPMC6353943 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature