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Dragonflies and DamselfliesModel Organisms for Ecological and Evolutionary Research$
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Alex Córdoba-Aguilar

Print publication date: 2008

Print ISBN-13: 9780199230693

Published to Oxford Scholarship Online: September 2008

DOI: 10.1093/acprof:oso/9780199230693.001.0001

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Sexual size dimorphism: patterns and processes

Sexual size dimorphism: patterns and processes

(p.231) CHAPTER 18 Sexual size dimorphism: patterns and processes
Dragonflies and Damselflies

Martín Alejandro Serrano-Meneses

Alex Córdoba-Aguilar

Tamás Székely (Contributor Webpage)

Oxford University Press

Odonates provide excellent model organisms for testing functional explanations of sexual size dimorphism (SSD) because of their wide variety of habitats, morphology, development, feeding behaviour, and mating strategies. This chapter discusses three major functional hypotheses of SSD and uses data on 133 odonate species to describe their patterns of SSD. It shows that SSD centres around monomorphism in dragonflies, whereas SSD is mostly male-biased in damselflies. Interestingly, phylogenetic comparative analyses suggest that damselflies — but not dragonflies — exhibit allometry consistent with Rensch's rule. Sexual selection acts mainly on males, whereas fecundity selection appears to influence female body size. Further tests, however, are essential, in particular of fecundity selection and the differential niche-utilization.

Keywords:   allometry, differential niche-utilisation, fecundity selection, Rensch's rule, sexual selection, sexual size dimorphism

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