Sexually antagonistic genetic variance for fitness in an ancestral and a novel environment

Delcourt, M, Blows, M.W. and Rundle, H.D. (2009) Sexually antagonistic genetic variance for fitness in an ancestral and a novel environment. Proceedings of the Royal Society of London - B, 276 1664: 2009-2014. doi:10.1098/rspb.2008.1459


Author Delcourt, M
Blows, M.W.
Rundle, H.D.
Title Sexually antagonistic genetic variance for fitness in an ancestral and a novel environment
Journal name Proceedings of the Royal Society of London - B   Check publisher's open access policy
ISSN 0962-8452
Publication date 2009-06-01
Year available 2009
Sub-type Article (original research)
DOI 10.1098/rspb.2008.1459
Open Access Status DOI
Volume 276
Issue 1664
Start page 2009
End page 2014
Total pages 6
Editor Michael P. Hassell
Place of publication United Kingdom
Publisher The Royal Society Publishing
Language eng
Subject C1
0603 Evolutionary Biology
0604 Genetics
970106 Expanding Knowledge in the Biological Sciences
Abstract The intersex genetic correlation for fitness (r(w)(fm)), a standardized measure of the degree to which male and female fitness covary genetically, has consequences for important evolutionary processes, but few estimates are available and none have explored how it changes with environment. Using a half-sibling breeding design, we estimated the genetic (co) variance matrix (G) for male and female fitness, and the resulting r(w)(fm), in Drosophila serrata. Our estimates were performed in two environments: the laboratory yeast food to which the population was well adapted and a novel corn food. The major axis of genetic variation for fitness in the two environments, accounting for 51.3 per cent of the total genetic variation, was significant and revealed a strong signal of sexual antagonism, loading negatively in both environments on males but positively on females. Consequently, estimates of r(w)(fm) were negative in both environments (-0.34 and -0.73, respectively), indicating that the majority of genetic variance segregating in this population has contrasting effects on male and female fitness. The possible strengthening of the negative r(w)(fm) in this novel environment may be a consequence of no history of selection for amelioration of sexual conflict. Additional studies from a diverse range of novel environments will be needed to determine the generality of this finding.
Formatted abstract
The intersex genetic correlation for fitness Graphic, a standardized measure of the degree to which male and female fitness covary genetically, has consequences for important evolutionary processes, but few estimates are available and none have explored how it changes with environment. Using a half-sibling breeding design, we estimated the genetic (co)variance matrix (G) for male and female fitness, and the resulting Graphic, in Drosophila serrata. Our estimates were performed in two environments: the laboratory yeast food to which the population was well adapted and a novel corn food. The major axis of genetic variation for fitness in the two environments, accounting for 51.3 per cent of the total genetic variation, was significant and revealed a strong signal of sexual antagonism, loading negatively in both environments on males but positively on females. Consequently, estimates of Graphic were negative in both environments (−0.34 and −0.73, respectively), indicating that the majority of genetic variance segregating in this population has contrasting effects on male and female fitness. The possible strengthening of the negative Graphic in this novel environment may be a consequence of no history of selection for amelioration of sexual conflict. Additional studies from a diverse range of novel environments will be needed to determine the generality of this finding.
Keyword adaptation
Drosophila serrata
intersex genetic correlation
fitness
sexual conflict
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Thu, 03 Sep 2009, 18:17:27 EST by Mr Andrew Martlew on behalf of School of Biological Sciences