Group selection may be defined as selection caused by the differential extinction or proliferation of groups1,2. The socially polymorphic spider Anelosimus studiosus exhibits a behavioural polymorphism in which females exhibit either a ‘docile’ or ‘aggressive’ behavioural phenotype3,4. Natural colonies are composed of a mixture of related docile and aggressive individuals, and populations differ in colonies’ characteristic docile:aggressive ratios5,6. Using experimentally constructed colonies of known composition, here we demonstrate that population-level divergence in docile:aggressive ratios is driven by site-specific selection at the group level—certain ratios yield high survivorship at some sites but not others. Our data also indicate that colonies responded to the risk of extinction: perturbed colonies tended to adjust their composition over two generations to match the ratio characteristic of their native site, thus promoting their long-term survival in their natal habitat. However, colonies of displaced individuals continued to shift their compositions towards mixtures that would have promoted their survival had they remained at their home sites, regardless of their contemporary environment. Thus, the regulatory mechanisms that colonies use to adjust their composition appear to be locally adapted. Our data provide experimental evidence of group selection driving collective traits in wild populations.
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We are indebted to S. E. Riechert for her assistance with the design and implementation of this experiment, and to J. Troupe and J. Taylor for their assistance with establishing and censusing colonies. J. E. Strassmann and W. P. Carson were invaluable in aiding in the submission of this paper. We thank M. Rebeiz for recommending that we compare colonies composed of native versus foreign individuals. S. M. Bertram, E. M. Jakob, C. N. Keiser, C. M. Wright, N. Pinter-Wollman, J. M. Jandt and A.P. Modlmeier provided helpful comments on this paper. Funding for this work was provided by a National Science Foundation grant to J.N.P. (IOS #1352705).
The authors declare no competing financial interests.
The source data for this manuscript have been deposited in the Dryad Digital Repository (http://dx.doi.org/10.5061/dryad.87g80).
Extended data figures and tables
Extended Data Figure 1 The heritability of the docile/aggressive phenotype as estimated by offspring on mid-parent regression.
Dams and sires were mated randomly and three female offspring were randomly selected from each brood for assays. The average inter-individual distance score of the three female offspring was regressed on mid-parent inter-individual distance. The slope of the resulting regression provides the estimate of heritability (h 2 = 0.66).
Extended Data Figure 2 The average group size, number of social parasites, numbers of prey captured in colonies’ webs, and the proportion of egg cases cannibalized at the height of the reproductive season for three high-resource sites and three low-resource sites.
The sites looked at were Little River (LR), Melton Hill (MH), Moccasin Creek (MC), Clinch River (CR) Don Carter (DC), Norris Dam (NR). Data presented here represent the averages obtained from 20 randomly selected naturally occurring colonies at each site. Error bars represent standard error of the mean.
Extended Data Figure 3 A figure depicting the relationship between colony extinction and two ecological variables: the number of social parasites (heterospecific spiders) and the proportion of egg cases cannibalized at the time of colony extinction.
Colony extinction events were associated with social parasite presence in high resource populations and egg case cannibalism in low resource populations. Error bars represent standard error of the mean.
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Pruitt, J., Goodnight, C. Site-specific group selection drives locally adapted group compositions. Nature 514, 359–362 (2014). https://doi.org/10.1038/nature13811
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