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Effect of operational sex ratio on female–female versus male–male competitive aggression

Title:

Effect of operational sex ratio on female–female versus male–male competitive aggression

Grant, James W.A. and Foam, Patricia E. (2002) Effect of operational sex ratio on female–female versus male–male competitive aggression. Canadian Journal of Zoology, 80 (12). pp. 2242-2246. ISSN 0008-4301

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Official URL: http://dx.doi.org/10.1139/z02-217

Abstract

We compared the patterns of female–female and male–male competition in Japanese medaka (Oryzias latipes) in response to changes in the operational sex ratio (OSR), the ratio of sexually active members of one sex to sexually active members of the opposite sex. As expected, courtship behaviour and intrasexual aggression were more frequent in males than in females. However, the overall patterns of female–female and male–male aggression were similar: intrasexual aggression increased with the OSR (female/male OSR for females and male/female OSR for males), consistent with predictions of mating-systems theory. A comparative analysis of our data and those from three other studies indicated that the rate of intrasexual aggression was greater in males than in females, but the patterns of intrasexual aggression were similar: the rate increased linearly and with a common slope with increasing OSR over a range of 0.4–3.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Grant, James W.A. and Foam, Patricia E.
Journal or Publication:Canadian Journal of Zoology
Date:December 2002
ID Code:7546
Deposited By:DANIELLE DENNIE
Deposited On:10 May 2011 16:42
Last Modified:10 May 2011 16:42
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