BioControl

, Volume 57, Issue 6, pp 759–766 | Cite as

Body size and fitness relation in male and female Diaeretiella rapae

  • R. Kant
  • M. A. Minor
  • S. A. Trewick
  • W. R. M. Sandanayaka
Article

Abstract

A strong relationship exists between body size and fitness in parasitoids. However, it is unclear whether the relationship is symmetric or asymmetric in males and females. The present study investigated the body size and fitness relationship in Diaeretiella rapae emerged from small and large nymphs of cabbage aphid Brevicoryne brassicae. A positive relationship existed between the size of the aphid host and growth of parasitoid larva developing in it. The fitness gain in males and females was not proportionate to their body size gain. Females mated with larger males produced 10 % more female offspring than females mated with smaller males. However, females that developed in large hosts produced 62 % more offspring (total male and female) than the females emerged from smaller hosts. The findings suggest that the number of offspring and the progeny sex ratio were affected by the body size of both male and female D. rapae.

Keywords

Diaeretiella rapae Parasitoid Body size Resource allocation Sex ratio Fitness 

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Copyright information

© International Organization for Biological Control (IOBC) 2012

Authors and Affiliations

  • R. Kant
    • 1
  • M. A. Minor
    • 1
  • S. A. Trewick
    • 1
  • W. R. M. Sandanayaka
    • 2
  1. 1.Ecology, Institute of Natural ResourcesMassey UniversityPalmerston NorthNew Zealand
  2. 2.The New Zealand Institute for Plant and Food Research LimitedAucklandNew Zealand

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