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Sex, Size and Gender RolesEvolutionary Studies of Sexual Size Dimorphism$
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Daphne J. Fairbairn, Wolf U. Blanckenhorn, and Tamás Székely

Print publication date: 2007

Print ISBN-13: 9780199208784

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780199208784.001.0001

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Variation in selection, phenotypic plasticity, and the ecology of sexual size dimorphism in two seed-feeding beetles

Variation in selection, phenotypic plasticity, and the ecology of sexual size dimorphism in two seed-feeding beetles

Chapter:
(p.88) Chapter 8 Variation in selection, phenotypic plasticity, and the ecology of sexual size dimorphism in two seed-feeding beetles
Source:
Sex, Size and Gender Roles
Author(s):

Charles W. Fox

R. Craig Stillwell

Jordi Moya-Laraño

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199208784.003.0010

This chapter reviews recent studies on two seed beetle species with contrasting sexual size dimorphism (SSD): males are larger in Stator limbatus and females are larger in Callosobruchus maculatus. Male ejaculate size clearly affects male fitness in S. limbatus via both fecundity and sexual selection, but not in C. maculatus. Female S. limbatus lay more eggs when mating with large males, reflecting either direct nutritional benefits obtained from male ejaculates or increased female allocation of resources following mating with large males. This difference in patterns of sex-specific selection between the species contributes to explaining the difference in SSD between the two species. However, variation in SSD, both within and among species of seed beetles, is also caused by differential phenotypic plasticity of the sexes. The implications of this for overall patterns such as Rensch's rule are discussed.

Keywords:   ejaculate size, fecundity selection, fitness, Rensch's rule, sexual selection, Stator

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