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Trading public goods stabilizes interspecific mutualism.
Marco Archetti1, István Scheuring
1Economic Theory, Faculty of Business and Economics, University of Basel, Peter Merian-Weg 6, Basel 4002, Switzerland. marco.archetti@unibas.ch
Journal of Theoretical Biology
|October 30, 2012
Summary
This study explains how species maintain cooperation (mutualism) even without punishing defectors. It shows that trading non-linear public goods stabilizes these interactions, supporting the evolution of mutualism.
Area of Science:
- Evolutionary Biology
- Game Theory
- Ecology
Background:
- Cooperation between species (mutualism) presents an evolutionary puzzle, particularly when individuals cannot distinguish or penalize non-cooperative partners.
- Traditional models often rely on mechanisms like partner fidelity or direct punishment to maintain mutualism.
Purpose of the Study:
- To explain the stability of mutualistic interactions in the absence of partner discrimination.
- To investigate the role of public goods exchange in maintaining interspecific cooperation.
Main Methods:
- Utilized game theory, specifically the theory of public goods.
- Modeled scenarios where individuals trade goods with non-linear contributions.
Main Results:
- Demonstrated that mutualism can be stable when partners exchange non-linear public goods, even without the ability to punish defectors.
- Showed that defectors can persist at significant frequencies within these stable mutualistic systems.
Conclusions:
- The exchange of non-linear public goods provides a theoretical framework for understanding the evolution of mutualism without direct partner control.
- This model offers testable predictions for empirical studies on the stability of interspecific cooperation.
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