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Proc Biol Sci. 2000 July 22; 267(1451): 1439–1444.
PMCID: PMC1690684

Reproductive alliances and posthumous fitness enhancement in male ants.

Abstract

Ants provide excellent opportunities for studying the evolutionary aspects of reproductive conflict. Relatedness asymmetries owing to the haplodiploid sex determination of Hymenoptera create substantial fitness incentives for gaining control over sex allocation, often at the expense of the fitness interests of nest-mates. Under worker-controlled split sex ratios either the reproductive interests of the mother queen (when workers male bias the sex ratio) or the father (when workers female bias the sex ratio), but never that of both parents simultaneously, are fulfilled. When workers bias sex ratios according to the frequency of queen mating, males which co-sire a colony have a joint interest in manipulating their daughter workers into rearing a more female-biased sex ratio. Here we show that males of the ant Formica truncorum achieve such manipulation by partial sperm clumping, so that the cohort-specific relatedness asymmetry of the workers in colonies with multiple fathers is higher than the cumulative relatedness asymmetry across worker cohorts. This occurs because a single male fathers the majority of the offspring within a cohort. Colonies with higher average cohort-specific relatedness asymmetry produce more female-biased sex ratios. Posthumously expressed male genes are thus able to oppose the reproductive interests of the genes expressed in queens and the latter apparently lack mechanisms for enforcing full control over sperm mixing and sperm allocation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Chapuisat M. Characterization of microsatellite loci in Formica lugubris B and their variability in other ant species. Mol Ecol. 1996 Aug;5(4):599–601. [PubMed]
  • Evans JD. Relatedness threshold for the production of female sexuals in colonies of a polygynous ant, Myrmica tahoensis, as revealed by microsatellite DNA analysis. Proc Natl Acad Sci U S A. 1995 Jul 3;92(14):6514–6517. [PubMed]
  • Laidlaw HH, Page RE. Polyandry in Honey Bees (APIS MELLIFERA L.): Sperm Utilization and Intracolony Genetic Relationships. Genetics. 1984 Dec;108(4):985–997. [PubMed]
  • Sundstrom L, Chapuisat M, Keller L. Conditional Manipulation of Sex Ratios by Ant Workers: A Test of Kin Selection Theory. Science. 1996 Nov 8;274(5289):993–995. [PubMed]
  • Trivers RL, Hare H. Haploidploidy and the evolution of the social insect. Science. 1976 Jan 23;191(4224):249–263. [PubMed]

Articles from Proceedings of the Royal Society B: Biological Sciences are provided here courtesy of The Royal Society