Ant workers selfishly bias sex ratios by manipulating female development

Hammond, R. L., Bruford, Michael William ORCID: https://orcid.org/0000-0001-6357-6080 and Bourke, A. F. G. 2002. Ant workers selfishly bias sex ratios by manipulating female development. Proceedings of the Royal Society B: Biological Sciences 269 (1487) , pp. 173-178. 10.1098/rspb.2001.1860

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Abstract

Kin selection theory predicts that social insects should perform selfish manipulations as a function of colony genetic structure. We describe a novel mechanism by which this occurs. First, we use microsatellite analyses to show that, in a population of the ant Leptothorax acervorum, workers' relatedness asymmetry (ratio of relatedness to females and relatedness to males) is significantly higher in monogynous (single–queen) colonies than in polygynous (multiple–queen) colonies. Workers rear mainly queens in monogynous colonies and males in polygynous colonies. Therefore, split sex ratios in this population are correlated with workers' relatedness asymmetry. Together with significant female bias in the population numerical and investment sex ratios, this finding strongly supports kin–selection theory. Second, by determining the primary sex ratio using microsatellite markers to sex eggs, we show that the ratio of male to female eggs is the same in both monogynous and polygynous colonies and equals the overall ratio of haploids (males) to diploids (queens and workers) among adults. In contrast to workers of species with selective destruction of male brood, L. acervorum workers therefore rear eggs randomly with respect to sex and must achieve their favoured sex ratios by selectively biasing the final caste (queen or worker) of developing females.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Sustainable Places Research Institute (PLACES)
Publisher:	Royal Society
ISSN:	0962-8452
Last Modified:	06 Jan 2024 02:55
URI:	https://orca.cardiff.ac.uk/id/eprint/63910

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