Condition and reproductive investment in the western mosquitofish (Gambusia affinis): little evidence for condition-dependent sex-biased investment

Research output: Contribution to journalArticle


In sexually reproducing species, resources may theoretically be distributed with bias to the production of male or female offspring in response to the condition of the mother, commonly recognized as sex allocation. Using a recently characterized sex-specific molecular marker, we tested for maternal sex allocation (i.e. maternal primary sex ratio bias and sex-specific offspring investment) in captive laboratory-bred western mosquitofish (Gambusia affinis) at early stages of offspring development. We found no statistical evidence to support sex allocation in G. affinis, based on maternal condition. In addition, we found little evidence for correlations between maternal condition and investment in the condition (mass) of individual offspring (of one sex or the other), although we did find that larger mothers tended to have higher fecundity.


  • Alistair M. Senior
  • Jiahui N. Lim
  • Sofia Adolfsson
  • Dunja K. Lamatsch
  • Shinichi Nakagawa
External organisations
  • University of Otago
  • University of New South Wales
  • University of Sydney
  • University of Innsbruck
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Zoology


  • fecundity, life-history trade-off, maternal condition, maternal investment, offspring size, Poeciliid, reproductive correlations, sex allocation, sex ratio, Trivers–Willard
Original languageEnglish
Pages (from-to)430-435
Number of pages6
JournalBiological Journal of the Linnean Society
Issue number2
Publication statusPublished - 2016 Oct 1
Publication categoryResearch