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Cyclic dominance emerges from the evolution of two inter-linked cooperative behaviours in the social amoeba

View ORCID ProfileShota Shibasaki, Masakazu Shimada
doi: https://doi.org/10.1101/251553
Shota Shibasaki
1Department of General Systems Studies, Graduate School of Arts and Sciences, the University of Tokyo, Tokyo, 1538902, Japan
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Masakazu Shimada
1Department of General Systems Studies, Graduate School of Arts and Sciences, the University of Tokyo, Tokyo, 1538902, Japan
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Abstract

Evolution of cooperation has been one of the most important problems in sociobiology, and many researchers have revealed mechanisms that can facilitate the evolution of cooperation. However, most studies deal only with one cooperative behaviour, even though some organisms perform two or more cooperative behaviours. The social amoeba Dictyostelium discoideum performs two cooperative behaviours in starvation: fruiting body formation and macrocyst formation. Here, we constructed a model that couples these two behaviours, and we found that the two behaviours are maintained due to the emergence of cyclic dominance, although cooperation cannot evolve if only either of the two behaviours is performed. The common chemoattractant cyclic AMP is used in both fruiting body formation and macrocyst formation, providing a biological context for this coupling. Cyclic dominance emerges regardless of the existence of mating types or spatial structure in the model. In addition, cooperation can re-emerge in the population even after it goes extinct. These results indicate that the two cooperative behaviours of the social amoeba are maintained due to the common chemical signal that underlies both fruiting body formation and macrocyst formation. We demonstrate the importance of coupling multiple games when the underlying behaviours are associated with one another.

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Posted April 23, 2018.
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Cyclic dominance emerges from the evolution of two inter-linked cooperative behaviours in the social amoeba
Shota Shibasaki, Masakazu Shimada
bioRxiv 251553; doi: https://doi.org/10.1101/251553
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Cyclic dominance emerges from the evolution of two inter-linked cooperative behaviours in the social amoeba
Shota Shibasaki, Masakazu Shimada
bioRxiv 251553; doi: https://doi.org/10.1101/251553

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