Oecologia

, Volume 108, Issue 1, pp 88–94 | Cite as

Clutch size manipulations in two seed beetles: consequences for progeny fitness

  • Chales W. Fox
  • John D. Martin
  • Monica S. Thakar
  • Timothy A. Mousseau
Population Ecology

Abstract

Seed beetles (Coleoptera: Bruchidae) lay their eggs on discrete resource patches, such that competition among larvae for food is an important component of their biology. Most seed beetles, including Stator limbatus, lay eggs singly on individual seeds and avoid superparasitism except when seeds are limiting. In contrast, S. beali, a closely related congener, lays eggs in clutches on a single seed. We tested the hypothesis that natural selection on larval life history characters favors small clutches (selection against large clutches) in S. limbatus, but that selection against large clutches is relaxed in S. beali because of the large size of its host's seeds. We manipulated clutch size and examined its relationship to offspring fitness. Clutch size affected the survivorship of S. limbatus larvae(r2=0.14), but had no detectable effect on the survivorship of S. beali larvae (r2=0.04). Also, clutch size had a large effect on development time and body weight of S. limbatus, but not of S. beali. We discuss the implications of this result for the evolution of clutch size in S. limbatus and S. beali.

Key words

Bruchidae Resource patches Clutch size Larval survival Larval development 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Chales W. Fox
    • 1
  • John D. Martin
    • 1
  • Monica S. Thakar
    • 1
  • Timothy A. Mousseau
    • 1
  1. 1.Department of Biology of Biological SciencesUniversity of South CarolinaColumbiaUSA
  2. 2.The Louis Calder Center of Fordham UniversityArmonkUSA

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