Ancestral Monogamy Shows Kin Selection Is Key to the Evolution of Eusociality

Published on May 30, 2008in Science47.728
· DOI :10.1126/SCIENCE.1156108
William O. H. Hughes45
Estimated H-index: 45
(University of Leeds),
Benjamin P. Oldroyd64
Estimated H-index: 64
(USYD: University of Sydney)
+ 1 AuthorsFrancis L. W. Ratnieks82
Estimated H-index: 82
(University of Sussex)
Close relatedness has long been considered crucial to the evolution of eusociality. However, it has recently been suggested that close relatedness may be a consequence, rather than a cause, of eusociality. We tested this idea with a comparative analysis of female mating frequencies in 267 species of eusocial bees, wasps, and ants. We found that mating with a single male, which maximizes relatedness, is ancestral for all eight independent eusocial lineages that we investigated. Mating with multiple males is always derived. Furthermore, we found that high polyandry (>2 effective mates) occurs only in lineages whose workers have lost reproductive totipotency. These results provide the first evidence that monogamy was critical in the evolution of eusociality, strongly supporting the prediction of inclusive fitness theory.
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