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Evolution of direct reciprocity in group-structured populations

People tend to have their social interactions with members of their own community. Such group-structured interactions can have a profound impact on the behaviors that evolve. Group structure affects the way people cooperate, and how they reciprocate each other’s cooperative actions. Past work has sh...

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Autores principales: Murase, Yohsuke, Hilbe, Christian, Baek, Seung Ki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9636277/
https://www.ncbi.nlm.nih.gov/pubmed/36333592
http://dx.doi.org/10.1038/s41598-022-23467-4
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author Murase, Yohsuke
Hilbe, Christian
Baek, Seung Ki
author_facet Murase, Yohsuke
Hilbe, Christian
Baek, Seung Ki
author_sort Murase, Yohsuke
collection PubMed
description People tend to have their social interactions with members of their own community. Such group-structured interactions can have a profound impact on the behaviors that evolve. Group structure affects the way people cooperate, and how they reciprocate each other’s cooperative actions. Past work has shown that population structure and reciprocity can both promote the evolution of cooperation. Yet the impact of these mechanisms has been typically studied in isolation. In this work, we study how the two mechanisms interact. Using a game-theoretic model, we explore how people engage in reciprocal cooperation in group-structured populations, compared to well-mixed populations of equal size. In this model, the population is subdivided into groups. Individuals engage in pairwise interactions within groups while they also have chances to imitate strategies outside the groups. To derive analytical results, we focus on two scenarios. In the first scenario, we assume a complete separation of time scales. Mutations are rare compared to between-group comparisons, which themselves are rare compared to within-group comparisons. In the second scenario, there is a partial separation of time scales, where mutations and between-group comparisons occur at a comparable rate. In both scenarios, we find that the effect of population structure depends on the benefit of cooperation. When this benefit is small, group-structured populations are more cooperative. But when the benefit is large, well-mixed populations result in more cooperation. Overall, our results reveal how group structure can sometimes enhance and sometimes suppress the evolution of cooperation.
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spelling pubmed-96362772022-11-06 Evolution of direct reciprocity in group-structured populations Murase, Yohsuke Hilbe, Christian Baek, Seung Ki Sci Rep Article People tend to have their social interactions with members of their own community. Such group-structured interactions can have a profound impact on the behaviors that evolve. Group structure affects the way people cooperate, and how they reciprocate each other’s cooperative actions. Past work has shown that population structure and reciprocity can both promote the evolution of cooperation. Yet the impact of these mechanisms has been typically studied in isolation. In this work, we study how the two mechanisms interact. Using a game-theoretic model, we explore how people engage in reciprocal cooperation in group-structured populations, compared to well-mixed populations of equal size. In this model, the population is subdivided into groups. Individuals engage in pairwise interactions within groups while they also have chances to imitate strategies outside the groups. To derive analytical results, we focus on two scenarios. In the first scenario, we assume a complete separation of time scales. Mutations are rare compared to between-group comparisons, which themselves are rare compared to within-group comparisons. In the second scenario, there is a partial separation of time scales, where mutations and between-group comparisons occur at a comparable rate. In both scenarios, we find that the effect of population structure depends on the benefit of cooperation. When this benefit is small, group-structured populations are more cooperative. But when the benefit is large, well-mixed populations result in more cooperation. Overall, our results reveal how group structure can sometimes enhance and sometimes suppress the evolution of cooperation. Nature Publishing Group UK 2022-11-04 /pmc/articles/PMC9636277/ /pubmed/36333592 http://dx.doi.org/10.1038/s41598-022-23467-4 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Murase, Yohsuke
Hilbe, Christian
Baek, Seung Ki
Evolution of direct reciprocity in group-structured populations
title Evolution of direct reciprocity in group-structured populations
title_full Evolution of direct reciprocity in group-structured populations
title_fullStr Evolution of direct reciprocity in group-structured populations
title_full_unstemmed Evolution of direct reciprocity in group-structured populations
title_short Evolution of direct reciprocity in group-structured populations
title_sort evolution of direct reciprocity in group-structured populations
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9636277/
https://www.ncbi.nlm.nih.gov/pubmed/36333592
http://dx.doi.org/10.1038/s41598-022-23467-4
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