Abstract

INSECT societies have long served as useful models in the study of two often intertwined issues in evolutionary biology: the levels at which natural selection operates1, and the phenomena of competition and cooperation in animal societies2. Hamilton3–5 provided a darwinian explanation for the evolution of cooperation by invoking natural selection for increased inclusive fitness, whereas Trivers and Hare6 showed how asymmetrical genetic relationships among members of hymenopteran societies result in differential fitness among queens and workers and can lead to conflict over the production of males. Here we provide evidence for competition among workers of the honey bee, Apis mellifera, in the production of female reproductives, a consequence of the genetic structure of colonies resulting from polyandry7, genotypic biases in components of cooperative behaviour associated with division of labour8–10, and kin recognition11–13. We also propose that nepotistic behaviour by honey bees is influenced by both kin- and colony-level selection.

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