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Competitive aggression in male and female Japanese medaka (Oryzias latipes) in relation to the operational sex resource ratio

Title:

Competitive aggression in male and female Japanese medaka (Oryzias latipes) in relation to the operational sex resource ratio

Clark, Lia (2009) Competitive aggression in male and female Japanese medaka (Oryzias latipes) in relation to the operational sex resource ratio. Masters thesis, Concordia University.

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Abstract

Because of the fundamental asymmetry between the sexes, males typically compete for access to females. Hence, most studies on intra-sexual mating aggression have focused only on males, and have shown increasing aggression with increasing operational sex ratio (OSR). However, one study documented a "dome-shaped" relationship between aggression and OSR, presumably because aggression became ineffective at high competitor densities as predicted by resource defence theory. The few studies that have investigated female intra-sexual aggression have used only a narrow range of OSR. The purpose of my study was to investigate the patterns of both male and female mating aggression over a broad range of OSR. I also compared how females competed for two different resources, food and mates. Male and female aggression initially increasing with OSR, peaked and then levelled off. For a given value of OSR, however, the rate of male aggression was higher than female aggression. The rate of male aggression was consistent with a dome-shaped pattern, whereas the rate of female aggression did not decrease at high levels of OSR. In contrast, courtship rates for both males and females decreased with increasing OSR in a linear manner. The pattern of male and female intra-sexual aggression were broadly consistent with the predictions of resource defence theory.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Thesis (Masters)
Authors:Clark, Lia
Pagination:vii, 37 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:M. Sc.
Program:Biology
Date:2009
Thesis Supervisor(s):Grant, Jim
ID Code:976647
Deposited By: Concordia University Library
Deposited On:22 Jan 2013 16:30
Last Modified:18 Jan 2018 17:42
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