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Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs

Author

Listed:
  • Jan Komdeur

    (University of Groningen
    Department of Wildlife Ecology
    University of Melbourne)

  • Serge Daan

    (University of Groningen)

  • Joost Tinbergen

    (University of Groningen)

  • Christa Mateman

    (Centre for Terrestrial Ecology)

Abstract

Young Seychelles warblers Acrocephalus sechellensis often remain in their natal territories as helpers. Helpers on low-quality territories (as measured by food availability) reduce their parents' reproductive success, whereas 1–2 helpers on high-quality territories increase their parents' reproductive success, thereby enhancing their inclusive fitness, in addition to gaining experience1,2, and opportunities for co-breeding3. Helpers are mostly females, and we have previously suggested that parents may adjust the sex of their single egg to territory quality4. We therefore took blood samples from nestlings, and determined sex using random amplified polymorphic DNA (RAPD) markers. We show that biased hatching sex ratios are caused by biased production and not by differential embryo mortality. Unhelped breeding pairs on low-quality territories produce 77% sons, whereas unhelped pairs on high-quality territories produce 13% sons. Breeding pairs that were transferred from low- to high-quality territories switched from the production of male to female eggs. Breeding pairs occupying high-quality territories switched from producing female eggs when no or one helper was present, to producing male eggs when two helpers were present in the territory.

Suggested Citation

  • Jan Komdeur & Serge Daan & Joost Tinbergen & Christa Mateman, 1997. "Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs," Nature, Nature, vol. 385(6616), pages 522-525, February.
    • Handle: RePEc:nat:nature:v:385:y:1997:i:6616:d:10.1038_385522a0
    DOI: 10.1038/385522a0
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    Cited by:

    1. Ferenc Molnár Jr & Thomas Caraco & Gyorgy Korniss, 2012. "Extraordinary Sex Ratios: Cultural Effects on Ecological Consequences," PLOS ONE, Public Library of Science, vol. 7(8), pages 1-12, August.

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