Testing Hamilton's rule with competition between relatives

Abstract

Hamilton’s1,2 theory of kin selection suggests that individuals should show less aggression, and more altruism, towards closer kin. Recent theoretical work has, however, suggested that competition between relatives can counteract kin selection for altruism3,4,5,6,7,8,9,10,11. Unfortunately, factors that tend to increase the average relatedness of interacting individuals—such as limited dispersal—also tend to increase the amount of competition between relatives. Therefore, in most natural systems, the conflicting influences of increased competition and increased relatedness are confounded, limiting attempts to test theory4,8,9,10. Fig wasp taxa exhibit varying levels of aggression among non-dispersing males that show a range of average relatedness levels. Thus, across species, the effects of relatedness and competition between relatives can be separated. Here we report that—contrary to Hamilton's original prediction1,2,12 but in agreement with recent theory5,6,7,8,9,10,11—the level of fighting between males shows no correlation with the estimated relatedness of interacting males, but is negatively correlated with future mating opportunities.

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Figure 1: Mean injury level contrasts plotted against estimated relatedness contrasts.
Figure 2: Mean injury level (LEI) contrasts plotted against the mean number of females developing in a fruit (log10 transformed) contrasts.
Figure 3: Hamilton's rule with relatedness and competition between relatives.

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Acknowledgements

We thank S. Frank, S. Nee, S. Reece and R. Trivers for comments that improved the clarity of our manuscript. This work was supported by the BBSRC, STRI and NERC.

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Correspondence to Stuart A. West.

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West, S., Murray, M., Machado, C. et al. Testing Hamilton's rule with competition between relatives. Nature 409, 510–513 (2001). https://doi.org/10.1038/35054057

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