Helping in cooperatively breeding long-tailed tits: A test of references

Ben J. Hatchwell, Philippa R. Gullett, Mark J. Adams

Research output: Contribution to journalArticlepeer-review

Abstract

Inclusive fitness theory provides the conceptual framework for our current understanding of social evolution, and empirical studies suggest that kin selection is a critical process in the evolution of animal sociality. A key prediction of inclusive fitness theory is that altruistic behaviour evolves when the costs incurred by an altruist (c) are outweighed by the benefit to the recipient (b), weighted by the relatedness of altruist to recipient (r), i.e. Hamilton's rule rb> c. Despite its central importance in social evolution theory, there have been relatively few empirical tests of Hamilton's rule, and hardly any among cooperatively breeding vertebrates, leading some authors to question its utility. Here, we use data from a long-term study of cooperatively breeding long-tailed tits Aegithalos caudatus to examine whether helping behaviour satisfies Hamilton's condition for the evolution of altruism.We showthat helpers are altruistic because they incur survival costs through the provision of alloparental care for offspring. However, they also accrue substantial benefits through increased survival of related breeders and offspring, and despite the low average relatedness of helpers to recipients, these benefits of helping outweigh the costs incurred.We conclude that Hamilton's rule for the evolution of altruistic helping behaviour is satisfied in this species.

Original languageEnglish
Article number20130565
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume369
Issue number1642
DOIs
Publication statusPublished - 19 May 2014

Keywords

  • Aegithalos caudatus
  • Altruism
  • Inclusive fitness
  • Kin selection
  • Relatedness
  • Social evolution

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