RUNAWAY SEXUAL SELECTION LEADS TO GOOD GENES
Article first published online: 22 AUG 2012
© 2012 The Author(s). Evolution© 2012 The Society for the Study of Evolution.
Volume 67, Issue 1, pages 110–119, January 2013
How to Cite
Chandler, C. H., Ofria, C. and Dworkin, I. (2013), RUNAWAY SEXUAL SELECTION LEADS TO GOOD GENES. Evolution, 67: 110–119. doi: 10.1111/j.1558-5646.2012.01750.x
- Issue published online: 4 JAN 2013
- Article first published online: 22 AUG 2012
- Received April 25, 2012, Accepted July 21, 2012, Data Archived: Dryad doi:10.5061/dryad.cq737
- Fisherian runaway;
- good genes;
- indicator traits
Mate choice and sexual displays are widespread in nature, but their evolutionary benefits remain controversial. Theory predicts these traits can be favored by runaway sexual selection, in which preference and display reinforce one another due to genetic correlation; or by good genes benefits, in which mate choice is advantageous because extreme displays indicate a well-adapted genotype. However, these hypotheses are not mutually exclusive, and the adaptive benefits underlying mate choice can themselves evolve. In particular, examining how and why sexual displays become indicators of good genes is challenging in natural systems. Here, we use experimental evolution in “digital organisms” to demonstrate the origins of condition-dependent indicator displays following their spread due to a runaway process. Surprisingly, handicap-like costs are not necessary for displays to become indicators of male viability. Instead, a pleiotropic genetic architecture underlies both displays and viability. Runaway sexual selection and good genes benefits should thus be viewed as interacting mechanisms that reinforce one another.