The evolutionary stability of cross-sex, cross-trait genetic covariances

Gosden, Thomas P. and Chenoweth, Stephen F. (2014) The evolutionary stability of cross-sex, cross-trait genetic covariances. Evolution, 68 6: 1687-1697. doi:10.1111/evo.12398

Author Gosden, Thomas P.
Chenoweth, Stephen F.
Title The evolutionary stability of cross-sex, cross-trait genetic covariances
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1111/evo.12398
Open Access Status
Volume 68
Issue 6
Start page 1687
End page 1697
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
Language eng
Subject 1100 Agricultural and Biological Sciences
1105 Dentistry
1311 Genetics
Abstract Although knowledge of the selective agents behind the evolution of sexual dimorphism has advanced considerably in recent years, we still lack a clear understanding of the evolutionary durability of cross-sex genetic covariances that often constrain its evolution. We tested the relative stability of cross-sex genetic covariances for a suite of homologous contact pheromones of the fruit fly Drosophila serrata, along a latitudinal gradient where these traits have diverged in mean. Using a Bayesian framework, which allowed us to account for uncertainty in all parameter estimates, we compared divergence in the total amount and orientation of genetic variance across populations, finding divergence in orientation but not total variance. We then statistically compared orientation divergence of within-sex (G) to cross-sex (B) covariance matrices. In line with a previous theoretical prediction, we find that the cross-sex covariance matrix, B, is more variable than either within-sex G matrix. Decomposition of B matrices into their symmetrical and nonsymmetrical components revealed that instability is linked to the degree of asymmetry. We also find that the degree of asymmetry correlates with latitude suggesting a role for spatially varying natural selection in shaping genetic constraints on the evolution of sexual dimorphism.
Keyword Cuticular hydrocarbons
Drosophila serrata
Intersexual genetic correlation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
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