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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18848

Title: Sexual Selection on Females: Comparing Two Estimates of Mating Success in a Sex-role Reversed Insect
Authors: Robson, Laura J.
Advisor: Gwynne, Darryl Trevor
Department: Ecology and Evolutionary Biology
Keywords: insect behaviour
sexual selection
sex-role reversal
Anabrus simplex
selection analysis
Issue Date: 15-Feb-2010
Abstract: While there has long been interest in the form of sexual selection in males, studies characterizing this selection in females remain sparse. Sexual selection on females is predicted for sex-role reversed Mormon crickets, where males are choosy of mates and nutrient-deprived females compete for matings to gain nutritious nuptial gifts. I used selection analyses to describe the strength and form of sexual selection on female morphology. There was no positive sexual selection on the female body size traits predicted to be associated with male preferences and female competition. Instead, I detected selection for decreasing head width and mandible length. Additionally, I tested the validity of a commonly-used instantaneous measure of mating success (mated vs. unmated) by comparing selection results with those determined using a more detailed fitness measure (cumulative mating rate). The two fitness measures yielded similar patterns of selection, supporting the common sampling method comparing mated and unmated fractions.
URI: http://hdl.handle.net/1807/18848
Appears in Collections:Master
Department of Ecology & Evolutionary Biology - Master theses

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