Restricting mutualistic partners to enforce trade reliance

Gregory A. K. Wyatt (), E. Toby Kiers, Andy Gardner and Stuart A. West
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Gregory A. K. Wyatt: University of Oxford
E. Toby Kiers: Institute of Ecological Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit
Andy Gardner: School of Biology, University of St Andrews, Dyers Brae
Stuart A. West: University of Oxford

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Mutualisms are cooperative interactions between members of different species, often involving the trade of resources. Here, we suggest that otherwise-cooperative mutualists might be able to gain a benefit from actively restricting their partners’ ability to obtain resources directly, hampering the ability of the restricted partner to survive and/or reproduce without the help of the restricting mutualist. We show that (i) restriction can be favoured when it makes the resources of the restricting individual more valuable to their partner, and thus allows them to receive more favourable terms of trade; (ii) restriction maintains cooperation in conditions where cooperative behaviour would otherwise collapse; and (iii) restriction can lead to either an increase or decrease in a restricted individual’s fitness. We discuss the applicability of this scenario to mutualisms such as those between plants and mycorrhizal fungi. These results identify a novel conflict in mutualisms as well as several public goods dilemmas, but also demonstrate how conflict can help maintain cooperation.

Date: 2016
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DOI: 10.1038/ncomms10322

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