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Haplodiploidy and the evolution of eusociality: worker revolution

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Joao Alpedrinha, Andy Gardner, Stuart A. West

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Abstract

Hamilton suggested that inflated relatedness between sisters promotes the evolution of eusociality in haplodiploid populations. Trivers and Hare observed that for this to occur, workers have to direct helping preferentially toward the production of sisters. Building on this, they proposed two biological scenarios whereby haplodiploidy could act to promote the evolution of eusociality: (a) workers biasing the sex allocation of the queen's brood toward females and (b) workers replacing the queen's sons with their own sons. This "worker revolution," whereby the worker class seizes control of sex allocation and reproduction, is expected to lead to helping being promoted in worker-controlled colonies. Here, we use a kin-selection approach to model the two scenarios suggested by Trivers and Hare. We show that (1) worker control of sex allocation may promote helping, but this effect is likely to be weak and short lived; and (2) worker reproduction tends to inhibit rather than promote helping. Furthermore, the promotion of helping is reduced by a number of biologically likely factors, including the presence of workers increasing colony productivity, workers being unmated, and worker control of sex allocation being underpinned by many loci each having a small effect. Overall, our results suggest that haplodiploidy has had a negligible influence on the evolution of eusociality.

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Original languageEnglish
Pages (from-to)303-317
Number of pages15
JournalAmerican Naturalist
Volume184
Issue number3
Early online date4 Aug 2014
DOIs
Publication statusPublished - Sep 2014

    Research areas

  • Kin selection, Sex allocation, Inclusive fitness, Social evolution, Helping, Altruism, Sex-ratio selection, Social insects, Hymenoptera, Populations, Monogamy, Model, Reproduction

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