期刊
JOURNAL OF HEREDITY
卷 110, 期 4, 页码 422-432出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esz031
关键词
constraint; genetic correlation; intralocus sexual conflict; sexual dimorphism; sexual selection
资金
- National Science Foundation [0922216, 1453089, 1457463]
- University of Virginia
- Virginia Tech
- Direct For Biological Sciences
- Division Of Environmental Biology [1457463] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [0922216, 1453089] Funding Source: National Science Foundation
Because the sexes share a genome, traits expressed in males are usually genetically correlated with the same traits expressed in females. On short timescales, between-sex genetic correlations (r(mf)) for shared traits may constrain the evolution of sexual dimorphism by preventing males and females from responding independently to sex-specific selection. However, over longer timescales, r(mf) may evolve, thereby facilitating the evolution of dimorphism. Although it has been suggested that sexually antagonistic selection may reduce r(mf), we lack a general theory for the evolution of r(mf) and its multivariate analog, the between-sex genetic covariance matrix (B). Here, we derive a simple analytical model for the within-generation change in B due to sex-specific directional selection. We present a single-trait example demonstrating that sex-specific directional selection may either increase or decrease between-sex genetic covariance, depending on the relative strength of selection in each sex and on the current value of r(mf). Although sexually antagonistic selection can reduce between-sex covariance, it will only do so when selection is much stronger in one sex than in the other. Counterintuitively, sexually antagonistic selection that is equal in strength in the 2 sexes will maintain positive between-sex covariance. Selection acting in the same direction on both sexes is predicted to reduce between-sex covariance in many cases. We illustrate our model numerically using empirical measures of sex-specific selection and between-sex genetic covariance from 2 populations of sexually dimorphic brown anole lizards (Anolis sagrei) and discuss its importance for understanding the resolution of intralocus sexual conflict.
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