Sex allocation and interactions between relatives in the bean beetle, Callosobruchus maculatus

S E Reece, R N Wherry, J M G Bloor

Research output: Contribution to journalArticlepeer-review

Abstract

When a small number of females contribute offspring to a discrete mating group, sex allocation (Local Mate Competition: LMC) theory predicts that females should bias their offspring sex ratio towards daughters, which avoids the fitness costs of their sons competing with each other. Conversely, when a large number of females contribute offspring to a patch, they are expected to invest equally in sons and daughters. Furthermore, sex ratios of species that regularly experience variable foundress numbers are closer to those predicted by LMC theory than species that encounter less variable foundress number scenarios. Due to their patterns of resource use, female Callosobruchus maculatus are likely to experience a broad range of foundress number scenarios. We carried out three experiments to test whether female C. maculatus adjust their sex ratios in response to foundress number and two other indicators of LMC: ovipositing on pre-parasitised patches and ovipositing with sisters. We did not find any evidence of the predicted sex ratio adjustment, but we did find evidence of kin biased behaviour. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)282-288
Number of pages7
JournalBehavioural Processes
Volume70
Issue number3
DOIs
Publication statusPublished - 1 Nov 2005

Keywords

  • bruchid
  • kin discriminatiom
  • local mate competition
  • sex allocation
  • LOCAL MATE COMPETITION
  • BRUCHID SEED-PREDATOR
  • RATIO ADJUSTMENT
  • PARASITIC WASP
  • COLEOPTERA
  • CONSTRAINTS
  • EVOLUTION
  • EXTRAORDINARY
  • ADAPTATION
  • BEHAVIOR

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