Sex ratios, local fitness enhancement and eusociality in the allodapine bee Exoneura richardsoni

Adam L. Cronin, Michael P. Schwarz

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    Previous studies of a facultatively eusocial allodapine bee, Exoneura richardsoni Rayment, indicated that high levels of cooperative nesting among close relatives seem to be maintained by benefits that lead to increases in per capita brood production. These traits could lead to local fitness enhancement, which in turn could select for female-biased sex ratios. We show here that sex investment ratios in this species are female-biased in small colony sizes, becoming progressively male-biased in larger colonies, consistent with expectations for local fitness enhancement, but not explainable by alternative models. Our results support previous suggestions that local fitness enhancement can lead to sex ratio bias in primitively social Hymenoptera, but differ from previous studies by suggesting that patterns of bias could lower selective thresholds for sub-directed altruism in small colonies, but have an opposing effect in large colonies.

    Original languageEnglish
    Pages (from-to)567-577
    Number of pages11
    JournalEVOLUTIONARY ECOLOGY
    Volume11
    DOIs
    Publication statusPublished - Sep 1997

    Keywords

    • Eusociality
    • Exoneura
    • Local fitness enhancement
    • Sex allocation
    • Social evolution

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