Interpopulation differences in expression of candidate genes for salinity tolerance in winter migrating anadromous brown trout (Salmo trutta L.).

摘要: Winter migration of immature brown trout (Salmo trutta) into freshwater rivers has been hypothesized to result from physiologically stressful combinations high salinity and low temperature in the sea. We sampled two Danish populations entering different saline conditions quantified expression hsp70 Na/K-ATPases α 1b genes following acclimation full-strength seawater at 2°C 10°C. An interaction effect on both Na/K-ATPase was found river conditions, while a independent up-regulation for marine with lower salinities. Overall our results support hypothesis that sea drive sea-run winter. However, also demonstrate intra-specific differences important stress osmoregulative most likely reflecting adaptive between regional scale, thus strongly suggesting local adaptations driven by environment.