The termite worker phenotype evolved as a dispersal strategy for fertile wingless individuals before eusociality

T. Bourguignon, R.A. Chisholm, Theo Evans

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    © 2016 by The University of Chicago. Termites are eusocial insects that evolved from solitary cockroaches. It is not known precisely what factors drove the evolution of termite eusociality, that is, skewed reproduction with distinct winged reproductive and wingless worker phenotypes. In other eusocial insects (bees and wasps), reproductive skew evolved first and phenotype differences evolved second. We propose that the reverse pattern occurred in termites, that is, that the winged-wingless diphenism evolved before eusociality. We discuss existing phylogenetic and pheromonal evidence supporting our hypothesis. We provide new experimental evidence from themost basal termite species (Mastotermes darwiniensis), suggesting that the ancestral state was indeed diphenic but presocial.Wepropose that the mechanismpromoting awinged-wingless diphenism—in the absence of eusociality—was greater predation of aerial than terrestrial dispersers, and we support this with a game theoretic model.Weaugment our hypothesis with a novel explanation for the evolution of the developmental pathways leading to winged and wingless phenotypes in termites. An added benefit of our hypothesis is that it neatly explains the origin of termite eusociality itself: in the pre-eusocial ancestral species, the poor dispersal ability of the wingless phenotype would have led to clustering of relatives around shared resources—a prerequisite for nonparental care of close relatives.
    Original languageEnglish
    Pages (from-to)372-387
    Number of pages16
    JournalAmerican Naturalist
    Volume187
    Issue number3
    DOIs
    Publication statusPublished - Mar 2016

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