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Título del libro: Dragonflies And Damselflies: Model Organisms For Ecological And Evolutionary Research
Título del capítulo: Sexual size dimorphism: Patterns and processes

Autores UNAM:
ALEJANDRO CORDOBA AGUILAR;
Autores externos:

Idioma:
Inglés
Año de publicación:
2008
Palabras clave:

Allometry; Differential niche-utilisation; Fecundity selection; Rensch's rule; Sexual selection; Sexual size dimorphism


Resumen:

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. © Oxford University Press 2008. All rights reserved.


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