Present address: L. Lehmann, Department of Genetics, University of Cambridge, Cambridge, UK.
An evolutionary analysis of the relationship between spite and altruism
Article first published online: 12 MAY 2006
Journal of Evolutionary Biology
Volume 19, Issue 5, pages 1507–1516, September 2006
How to Cite
LEHMANN, L., BARGUM, K. and REUTER, M. (2006), An evolutionary analysis of the relationship between spite and altruism. Journal of Evolutionary Biology, 19: 1507–1516. doi: 10.1111/j.1420-9101.2006.01128.x
- Issue published online: 12 MAY 2006
- Article first published online: 12 MAY 2006
- Received 25 January 2006; revised 1 March 2006; accepted 3 March 2006
- game theory;
- Hamilton's rule;
- inclusive fitness;
- social evolution;
We investigate the selective pressures on a social trait when evolution occurs in a population of constant size. We show that any social trait that is spiteful simultaneously qualifies as altruistic. In other words, any trait that reduces the fitness of less related individuals necessarily increases that of related ones. Our analysis demonstrates that the distinction between ‘Hamiltonian spite’ and ‘Wilsonian spite’ is not justified on the basis of fitness effects. We illustrate this general result with an explicit model for the evolution of a social act that reduces the recipient's survival (‘harming trait’). This model shows that the evolution of harming is favoured if local demes are of small size and migration is low (philopatry). Further, deme size and migration rate determine whether harming evolves as a selfish strategy by increasing the fitness of the actor, or as a spiteful/altruistic strategy through its positive effect on the fitness of close kin.