Behavioral Ecology and Sociobiology

, Volume 59, Issue 5, pp 589–596

Impacts of flight distance on sex ratio and resource allocation to offspring in the leafcutter bee, Megachile rotundata

  • Jason H. Peterson
  • Bernard D. Roitberg
  • J. H. Peterson
Original Article

Abstract

Fisher's theoretical prediction of equal investment in each sex for a panmictic population (The genetical theory of natural selection. Clarendon, Oxford, 1930) can be altered by a number of factors. For example, the sex ratio theory predicts variation in equal investment in each sex when the maternal fitness gains from increased investment differ between sexes. Changing sex allocation because of changing payoffs may result from different ecological situations, such as foraging conditions. We investigated the impact of foraging travel cost on relative investment in sons vs daughters. Field studies were carried out with the central-place-foraging leafcutter bee Megachile rotundata (Fabricius), which has smaller males than females. Therefore, less investment is required to produce a viable son compared with a daughter. We found that with increased flight distance to resources, females produced a greater proportion of sons. Females also invested fewer resources in individual sons and daughters and produced fewer offspring with increased flight distance.

Keywords

Sex ratio Flight distance Central-place-forager Megachile rotundata Leafcutter bee 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Jason H. Peterson
    • 1
  • Bernard D. Roitberg
    • 1
  • J. H. Peterson
    • 2
  1. 1.Behavioral Ecology Research Group, Department of BiologySimon Fraser UniversityBurnabyCanada
  2. 2.Department of BiologyThe King's University CollegeEdmontonCanada

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