Aug 2, 2016

Genetic correlations and sex-specific adaptation in changing environments

Evolution; International Journal of Organic Evolution
Tim Connallon, M D Hall

Abstract

Females and males have conflicting evolutionary interests. Selection favors the evolution of different phenotypes within each sex, yet divergence between the sexes is constrained by the shared genetic basis of female and male traits. Current theory predicts that such "sexual antagonism" should be common: manifesting rapidly during the process of adaptation, and slow in its resolution. However, these predictions apply in temporally stable environments. Environmental change has been shown empirically to realign the direction of selection acting on shared traits and thereby alleviate signals of sexually antagonistic selection. Yet there remains no theory for how common sexual antagonism should be in changing environments. Here, we analyze models of sex-specific evolutionary divergence under directional and cyclic environmental change, and consider the impact of genetic correlations on long-run patterns of sex-specific adaptation. We find that environmental change often aligns directional selection between the sexes, even when they have divergent phenotypic optima. Nevertheless, some forms of environmental change generate persistent sexually antagonistic selection that is difficult to resolve. Our results reinforce recent empirical...Continue Reading

  • References49
  • Citations12

References

  • References49
  • Citations12

Citations

Mentioned in this Paper

Patterns
Environment
Adaptation
Direction
Analysis
Antagonists
Impacts, Environmental
Metazoa
Selection, Genetic
EAF2 gene

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