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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Hamilton, W. D. The evolution of altruistic behaviour. Am. Nat. 97, 354–356 (1963).
Hamilton, W. D. The genetical evolution of social behaviour, I & II. J. Theor. Biol. 7, 1–52 ( 1964).
Grafen, A. in Behavioural Ecology: An Evolutionary Approach (eds Krebs, J. R. & Davies, N. B.) 62–84 (Blackwell Scientific, Oxford, 1984).
Murray, M. G. & Gerrard, R. J. Conflict in the neighbourhood: models where close relatives are in direct competition. J. Theor. Biol. 111, 237–246 ( 1984).
Wilson, D. S., Pollock, G. B. & Dugatkin, L. A. Can altruism evolve in purely viscous populations. Evol. Ecol. 6, 331–341 (1992).
Taylor, P. D. Altruism in viscous populations—an inclusive fitness model. Evol. Ecol. 6, 352–356 ( 1992).
Taylor, P. D. Inclusive fitness in a homogeneous environment. Proc. R. Soc. Lond. B 249, 299–302 ( 1992).
Queller, D. C. Does population viscosity promote kin selection? Trends Ecol. Evol. 7, 322–324 ( 1992).
Queller, D. C. Genetic relatedness in viscous populations. Evol. Ecol. 8, 70–73 (1994).
Frank, S. A. Foundations of Social Evolution (Princeton Univ. Press, Princeton, 1998).
Kelly, J. K. The effect of scale dependent processes on kin selection: mating and density regulation. Theor. Popul. Biol. 46, 32– 57 (1994).
Hamilton, W. D. in Reproductive Competition and Sexual Selection in Insects (eds Blum, M. S. & Blum, N. A.) 167–220 (Academic, New York, 1979).
Murray, M. G. The closed environment of the fig receptacle and its influence on male conflict in the Old World fig wasp, Philotrypesis pilosa. Anim. Behav. 35, 488–506 ( 1987).
Murray, M. G. Environmental constraints on fighting in flightless male fig wasps. Anim. Behav. 38, 186–193 (1989).
Herre, E. A. et al. in Social Competition and Cooperation in Insects and Arachnids Vol. I, The Evolution of Mating Systems (eds Choe, J. & Crespi, B. ) 226–239 (Princeton Univ. Press, Princeton, 1997).
West, S. A. & Herre, E. A. Partial local mate competition and the sex ratio: a study on non-pollinating fig wasps. J. Evol. Biol. 11, 531–548 ( 1998).
Enquist, M. & Leimar, O. The evolution of fatal fighting. Anim. Behav. 39, 1–9 (1990).
Vincent, S. L. Polymorphism and Fighting in Male Fig Wasps. Thesis, Rhodes Univ. (1991).
Harvey, P. H. & Pagel, M. D. The Comparative Method in Evolutionary Biology (Oxford Univ. Press, Oxford, 1991).
CluttonBrock, T. H. et al. Individual contributions to babysitting in a cooperative mongoose, Suricata suricatta. Proc. R. Soc. Lond. B 267, 301–305 (2000).
Carcamo, H. A. & Spence, J. R. Kin discrimination and cannibalism in water striders (Heteroptera: Gerridae): another look. Oikos 70, 412–416 ( 1994).
Dunn, P. O., Cockburn, A. & Mulder, R. A. Fairy-wren helpers often care for young to which they are unrelated. Proc. R. Soc. Lond. B 259, 339–343 (1995).
Magrath, R. D. & Whittingham, L. A. Subordinate males are more likely to help if unrelated to the breeding female in cooperatively breeding white-browed scrubwrens. Behav. Ecol. Sociobiol. 41, 185–192 (1997).
CluttonBrock, T. H. et al. Selfish sentinels in cooperative mammals. Science 284, 1640–1644 ( 1999).
Read, A. F., Anwar, M., Shutler, D. & Nee, S. Sex allocation and population structure in malaria and related parasitic protozoa. Proc. R. Soc. Lond. B. 260, 359–363 (1995).
West, S. A., Smith T. G. & Read, A. F. Sex allocation and population structure in apicomplexan (protozoa) parasites. Proc. R. Soc. Lond. B. 267, 257– 263 (2000).
Machado, C. A., Herre, E. A., McCafferty, S. & Bermingham, E. Molecular phylogenies of fig pollinating and non-pollinating wasps and the implications for the origin and evolution of the fig–fig wasp mutualism. J. Biogeogr. 23, 531–542 (1996).
Machado, C. A. Molecular Natural History of Fig Wasps. Thesis, Univ. California (1998).
Yang, Z. Estimating the pattern of nucleotide substitution. J. Mol. Evol. 39, 105–111 ( 1994).
Purvis, A. & Rambaut, A. Comparative analysis by independent contrasts (CAIC): an Apple Macintosh application for analysing comparative data. Comput. Applics Biosci. 11, 247– 251 (1995).
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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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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