Intrasexual competition in females: evidence for sexual selection?
Open Access
- 8 September 2011
- journal article
- research article
- Published by Oxford University Press (OUP) in Behavioral Ecology
- Vol. 22 (6), 1131-1140
- https://doi.org/10.1093/beheco/arr106
Abstract
In spite of recent interest in sexual selection in females, debate exists over whether traits that influence female–female competition are sexually selected. This review uses female–female aggressive behavior as a model behavioral trait for understanding the evolutionary mechanisms promoting intrasexual competition, focusing especially on sexual selection. I employ a broad definition of sexual selection, whereby traits that influence competition for mates are sexually selected, whereas those that directly influence fecundity or offspring survival are naturally selected. Drawing examples from across animal taxa, including humans, I examine 4 predictions about female intrasexual competition based on the abundance of resources, the availability of males, and the direct or indirect benefits those males provide. These patterns reveal a key sex difference in sexual selection: Although females may compete for the number of mates, they appear to compete more so for access to high-quality mates that provide direct and indirect (genetic) benefits. As is the case in males, intrasexual selection in females also includes competition for essential resources required for access to mates. If mate quality affects the magnitude of mating success, then restricting sexual selection to competition for quantity of mates may ignore important components of fitness in females and underestimate the role of sexual selection in shaping female phenotype. In the future, understanding sex differences in sexual selection will require further exploration of the extent of mutual intrasexual competition and the incorporation of quality of mating success into the study of sexual selection in both sexes.This publication has 174 references indexed in Scilit:
- Dopaminergic regulation of mate competition aggression and aromatase-Fos colocalization in vasotocin neuronsNeuropharmacology, 2010
- Evolution of weaponry in female bovidsProceedings. Biological sciences, 2009
- Postcopulatory sexual selection: Darwin's omission and its consequencesProceedings of the National Academy of Sciences of the United States of America, 2009
- Mate choice and sexual selection: What have we learned since Darwin?Proceedings of the National Academy of Sciences of the United States of America, 2009
- Reproductive skew in female common marmosets: what can proximate mechanisms tell us about ultimate causes?Proceedings. Biological sciences, 2008
- Starving the competition: a proximate cause of reproductive skew in burying beetles (Nicrophorus vespilloides)Proceedings. Biological sciences, 2008
- Female-mediated causes and consequences of status change in a social fishProceedings. Biological sciences, 2008
- Function of weaponry in females: the use of horns in intrasexual competition for resources in female Soay sheepBiology Letters, 2007
- Context matters: female aggression and testosterone in a year-round territorial neotropical songbird ( Thryothorus leucotis )Proceedings. Biological sciences, 2007
- Stress and the suppression of subordinate reproduction in cooperatively breeding meerkatsProceedings of the National Academy of Sciences of the United States of America, 2006