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Experimental evidence of frequency-dependent selection on group behaviour

Nature Ecology & Evolutionvolume 3pages702707 (2019) | Download Citation

Abstract

Evolutionary ecologists often seek to identify the mechanisms maintaining intraspecific variation. In social animals, whole groups can exhibit between-group differences in their collective traits. We examined whether negative frequency-dependent selection (that is, a rare-type advantage) could help to maintain between-group variation. We engineered neighbourhoods of social spider colonies bearing bold or shy foraging phenotypes and monitored their fecundity in situ. We found that bold colonies enjoyed a rare-type advantage that is lost as the frequency of bold colonies in a neighbourhood increases. The success of shy colonies was not frequency dependent. These dynamics seem to be driven by a foraging advantage of bold colonies that is lost in bold neighbourhoods because prey become scarce, and shy colonies perform better than bold colonies under low-resource conditions. Thus, to understand selection on collective traits, it is insufficient to examine groups in isolation. The phenotypic environment in which groups reside and compete must also be considered.

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Data availability

The data used in this study are available from Dryad (https://doi.org/10.5061/dryad.m592p4g). Raw data are depicted in Fig. 3b,c and Supplementary Figs. 16.

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Acknowledgements

We thank A. Santoro, E. Eliason, H. Moeller, D. Fisher, A. Little and A. Radford for their help in improving previous versions of this manuscript. Funding was provided by NSF IOS grant numbers 1455895 to J.N.P., 1456010 to N.P.W., NIH GM115509 to N.P.W. and J.N.P., and the Tricounsel Agencies of Canada in association with a Canada 150 Research Chair Professorship to J.N.P.

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Affiliations

  1. Department of Ecology, Evolution & Marine Biology, University of California—Santa Barbara, Santa Barbara, CA, USA

    • Jonathan N. Pruitt
  2. Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, Ontario, Canada

    • Jonathan N. Pruitt
    •  & Brendan L. McEwen
  3. Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA

    • Steven T. Cassidy
  4. Department of Ecology & Evolutionary Biology, University of California—Los Angeles, Los Angeles, CA, USA

    • Gabriella M. Najm
    •  & Noa Pinter-Wollman

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All authors contributed to study design, data collection, statistical analysis, and composing of the manuscript. All authors were included in all aspects of the pipeline.

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The authors declare no competing interests.

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Correspondence to Jonathan N. Pruitt.

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https://doi.org/10.1038/s41559-019-0852-z