title: Strain specific genotype-environment interactions and evolutionary potential for body mass in brook charr (Salvelinus fontinalis).
abstract: Discriminating between genetic and environmental causes of phenotypic variation is an essential requirement for understanding the evolutionary potential of populations. However, the extent to which genetic variation differs among conspecific groups and environments during ontogeny has rarely been investigated. In this study, the genetic basis of body mass was measured in three divergent strains of brook charr (Salvelinus fontinalis) in different rearing environments and at different time periods. The results indicate that body mass was a heritable trait in all strains but that the level of heritability greatly differed among strains. Moreover, heritability estimates of each strain varied differently according to environmental rearing conditions, and cross-environments correlations were all significantly lower than unity, indicating strain-specific patterns of genotype-environment interactions. Heritability estimates also varied throughout ontogeny and decreased by 50% from 9 to 21 months of age. This study highlights the divergence in genetic architecture and evolutionary potential among these strains and emphasizes the importance of considering the strain-specific potential of the response to selection according to environmental variation.
authors: Institut des Sciences de la Mer de Rimouski, Université du Québec à Rimouski, Rimouski, QC, G5L 3A1, Canada.
authors: Amélie
authors: A
authors: Crespel
authors: Louis
authors: L
authors: Bernatchez
authors: Céline
authors: C
authors: Audet
authors: Dany
authors: D
authors: Garant
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001835:Body Weight / Q000235:genetics*; D003433:Crosses, Genetic; D059647:Gene-Environment Interaction; D014644:Genetic Variation; D005838:Genotype; D010641:Phenotype; D019655:Quantitative Trait, Heritable; D012641:Selection, Genetic; D013045:Species Specificity; D013997:Time Factors; D014337:Trout / Q000235:genetics* / Q000502:physiology
keywords: evolutionary potential; genetic architecture; gene−environment interactions; heritability; strains