Size-related inbreeding preference and competitiveness in male Pelvicachromis taeniatus (Cichlidae)
AbstractSexual selection is an important force in the evolution of body size. Both intersexual selection, that is, preference for large individuals, and intrasexual selection, that is, increased competitiveness of large individuals, are involved in this process. Furthermore, preferences based on body size of the choosing individual might also influence body size evolution. Here, we investigated male mate choice and competitiveness in relation to male body size in Pelvicachromis taeniatus, a size-dimorphic cichlid. In previous experiments, both sexes showed mating preferences for larger and genetically related individuals. First, we examined male inbreeding preferences based on olfactory cues. Males that highly varied in body size were given the choice between the odor of a familiar sister and the odor of an unfamiliar unrelated female that were presented in combination with a computer-animated image of a female P. taeniatus as a visual stimulus. Male preference for the odor of their sisters was correlated with male body size. Only larger males were choosy concerning related odors and preferred their sisters, whereas smaller males were unselective. Second, we showed that large males outcompete smaller males in contest over a breeding site. The extent of aggression was negatively correlated with the size difference between the 2 males. Variation in male choice may reflect an adaptive strategy: small, less competitive and less attractive males might avoid the risk of failing to mate at all by reducing choosiness. Consequently, only large competitive males should obtain the benefits of choice, which may further contribute to the selective advantages of large body size. Copyright 2011, Oxford University Press.
Download InfoIf you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.
Bibliographic InfoArticle provided by International Society for Behavioral Ecology in its journal Behavioral Ecology.
Volume (Year): 22 (2011)
Issue (Month): 2 ()
Contact details of provider:
Postal: Oxford University Press, Great Clarendon Street, Oxford OX2 6DP, UK
Fax: 01865 267 985
Web page: http://beheco.oxfordjournals.org/
You can help add them by filling out this form.
reading list or among the top items on IDEAS.Access and download statisticsgeneral information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Oxford University Press) or (Christopher F. Baum).
If references are entirely missing, you can add them using this form.