Thorne, A D, Pexton, J J, Dytham, C and Mayhew, P J (2006) Small body size in an insect shifts development, prior to adult eclosion, towards early reproduction. Proceedings of the Royal Society B: Biological Sciences. pp. 1099-1103. ISSN 1471-2954Full text available as:
Life-history theory has suggested that individual body size can strongly affect the allocation of resources to reproduction and away from other traits such as survival. In many insects, adults eclose with a proportion of their potential lifetime egg production that is already mature (the ovigeny index). We establish for the solitary parasitoid wasp Aphaereta genevensis that the ovigeny index decreases with adult body size, despite both initial egg load and potential lifetime fecundity increasing with body size. This outcome is predicted by adaptive models and is the first unequivocal intraspecific demonstration. Evidence suggests that a high ovigeny index carries a cost of reduced longevity in insects. Our results therefore contribute to the emerging evidence that small body size can favour a developmental shift in juveniles that favours early reproduction, but which has adverse late-life consequences. These findings are likely to have important implications for developmental biologists and population biologists.
|Copyright, Publisher and Additional Information:||© 2006 The Royal Society|
|Keywords:||adaptation, ecological developmental biology, Hymenoptera, life histories, oogenesis, ovigeny index, LIFE-HISTORY EVOLUTION, PARASITOID WASPS, GREGARIOUS DEVELOPMENT, EGG MATURATION, ASOBARA-TABIDA, PLASTICITY, STRATEGY, ALLOCATION, FITNESS, OVIGENY|
|Academic Units:||The University of York > Biology (York)|
|Depositing User:||Repository Officer|
|Date Deposited:||13 Jun 2006|
|Last Modified:||17 Oct 2013 14:19|