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Rethinking mutualism stability: cheaters and the evolution of sanctions
1Department of Ecology & Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3G5, Canada. m.frederickson@utoronto.ca
The Quarterly Review of Biology
|February 21, 2014
Summary
Cooperation evolves through partner choice and sanctions, but cheaters rarely drive these mechanisms in species interactions. Sanctions likely evolved for other reasons, offering new insights into mutualism.
Area of Science:
- Evolutionary Biology
- Ecology
- Behavioral Ecology
Background:
- Cooperation is a fundamental biological phenomenon observed across diverse taxa.
- Understanding the persistence of cooperation and the prevention of cheating is a central question in evolutionary biology.
- Mutualisms, or interspecies cooperation, involve feedback loops that can align partner fitness interests.
Purpose of the Study:
- To investigate the evolutionary origins and stability of mutualisms, focusing on the role of sanctions and partner choice.
- To critically evaluate the hypothesis that sanctions evolve primarily as a response to cheating symbionts.
- To explore alternative explanations for the evolution of host sanctions and their impact on mutualism stability.
Main Methods:
- Review of empirical evidence from well-studied mutualisms, including yucca-yucca moth, fig-fig wasp, and legume-rhizobium systems.
- Analysis of the prevalence of cheating and the selective pressures exerted by cheaters in these mutualistic interactions.
- Examination of the timing and potential functions of host sanctions in relation to the evolution of cheating.
Main Results:
- Empirical evidence suggests that cheating is uncommon in the reviewed mutualisms, casting doubt on sanctions evolving primarily for retaliation.
- Host sanctions and partner choice mechanisms may have evolved for reasons independent of, or prior to, the evolution of cheating.
- The prevalence and evolution of mutualism may be influenced by factors other than direct selection against cheaters.
Conclusions:
- Sanctions in mutualisms likely evolved for functions other than punishing cheaters, offering new perspectives on coevolutionary dynamics.
- Understanding the non-retaliatory functions of sanctions provides insights into why mutualism evolves in some lineages but not others.
- Alternative selective pressures may be more significant drivers of mutualism stability and the evolution of cooperative traits.
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