Comparative analysis of population structure across environments and geographical scales at major histocompatibility complex and microsatellite loci in Atlantic salmon (Salmo salar)

摘要: Evidence of selection acting on major histocompatibility complex (MHC) genes has been illustrated with the analysis their nucleotide sequences and allele frequency distribution. Comparing patterns population differentiation at neutral markers MHC in wild may provide further insights about relative role neutrality shaping diversity. In this study, we combine both methods to assess a gene Atlantic salmon. We compare variation class II B locus microsatellites among 14 samples from seven different rivers subpopulations within single river system covering variety habitats geographical scales. show that diversifying is sites involved antigen presentation balancing maintains high level polymorphism populations. Despite important differences habitat type, comparison structure large scales reveals correlation between differentiation, indicating drift migration have more than locus. contrast, strong discrepancies two types provides support for rivers. Together, these results confirm natural influencing diversity salmon although forces also be evolution.