The role of selective extinction in promoting cooperation in a many demes model

•Diffusion approximation captures evolutionary dynamics.,•Uniform extinction suppresses cooperation in structured populations.,•Targeted extinction can promote cooperation.,•Extinction rate’s impact depends on payoff asymmetry (T−R vs. P−S). This study investigates the evolution of cooperation in a...

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Published inJournal of theoretical biology Vol. 613; p. 112212
Main Author Kroumi, Dhaker
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 07.10.2025
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Abstract •Diffusion approximation captures evolutionary dynamics.,•Uniform extinction suppresses cooperation in structured populations.,•Targeted extinction can promote cooperation.,•Extinction rate’s impact depends on payoff asymmetry (T−R vs. P−S). This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner’s Dilemma. Reproduction is payoff-dependent, and demes contribute to a global migrant pool proportionally to their fecundity. Deme extinction occurs with a baseline probability plus an additional probability term that is proportional to the fraction of defectors in the deme, modulated by a parameter α. Extinct demes are then repopulated from the migrant pool. A two-timescale analysis, valid in the limit of a large number of demes, reveals that the system’s evolutionary dynamics are well-approximated by a continuous-time diffusion process. Using this diffusion approximation, we show that uniform extinction (α=0) suppresses cooperation. However, extinction targeting defector-dominated demes can significantly promote cooperation, establishing critical thresholds of α that determine when cooperation dominates. The study further explores how varying extinction rates and reproductive dynamics impact cooperation’s persistence and evolutionary success in structured populations.
AbstractList •Diffusion approximation captures evolutionary dynamics.,•Uniform extinction suppresses cooperation in structured populations.,•Targeted extinction can promote cooperation.,•Extinction rate’s impact depends on payoff asymmetry (T−R vs. P−S). This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner’s Dilemma. Reproduction is payoff-dependent, and demes contribute to a global migrant pool proportionally to their fecundity. Deme extinction occurs with a baseline probability plus an additional probability term that is proportional to the fraction of defectors in the deme, modulated by a parameter α. Extinct demes are then repopulated from the migrant pool. A two-timescale analysis, valid in the limit of a large number of demes, reveals that the system’s evolutionary dynamics are well-approximated by a continuous-time diffusion process. Using this diffusion approximation, we show that uniform extinction (α=0) suppresses cooperation. However, extinction targeting defector-dominated demes can significantly promote cooperation, establishing critical thresholds of α that determine when cooperation dominates. The study further explores how varying extinction rates and reproductive dynamics impact cooperation’s persistence and evolutionary success in structured populations.
This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner's Dilemma. Reproduction is payoff-dependent, and demes contribute to a global migrant pool proportionally to their fecundity. Deme extinction occurs with a baseline probability plus an additional probability term that is proportional to the fraction of defectors in the deme, modulated by a parameter α. Extinct demes are then repopulated from the migrant pool. A two-timescale analysis, valid in the limit of a large number of demes, reveals that the system's evolutionary dynamics are well-approximated by a continuous-time diffusion process. Using this diffusion approximation, we show that uniform extinction (α=0) suppresses cooperation. However, extinction targeting defector-dominated demes can significantly promote cooperation, establishing critical thresholds of α that determine when cooperation dominates. The study further explores how varying extinction rates and reproductive dynamics impact cooperation's persistence and evolutionary success in structured populations.This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner's Dilemma. Reproduction is payoff-dependent, and demes contribute to a global migrant pool proportionally to their fecundity. Deme extinction occurs with a baseline probability plus an additional probability term that is proportional to the fraction of defectors in the deme, modulated by a parameter α. Extinct demes are then repopulated from the migrant pool. A two-timescale analysis, valid in the limit of a large number of demes, reveals that the system's evolutionary dynamics are well-approximated by a continuous-time diffusion process. Using this diffusion approximation, we show that uniform extinction (α=0) suppresses cooperation. However, extinction targeting defector-dominated demes can significantly promote cooperation, establishing critical thresholds of α that determine when cooperation dominates. The study further explores how varying extinction rates and reproductive dynamics impact cooperation's persistence and evolutionary success in structured populations.
This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner's Dilemma. Reproduction is payoff-dependent, and demes contribute to a global migrant pool proportionally to their fecundity. Deme extinction occurs with a baseline probability plus an additional probability term that is proportional to the fraction of defectors in the deme, modulated by a parameter α. Extinct demes are then repopulated from the migrant pool. A two-timescale analysis, valid in the limit of a large number of demes, reveals that the system's evolutionary dynamics are well-approximated by a continuous-time diffusion process. Using this diffusion approximation, we show that uniform extinction (α=0) suppresses cooperation. However, extinction targeting defector-dominated demes can significantly promote cooperation, establishing critical thresholds of α that determine when cooperation dominates. The study further explores how varying extinction rates and reproductive dynamics impact cooperation's persistence and evolutionary success in structured populations.
ArticleNumber 112212
Author Kroumi, Dhaker
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Keywords Diffusion approximation
Secondary 60J70
Prisoner’s dilemma
Island model
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Identity by descent
Extinction-recolonization Mathematics Subject Classification
Fixation probability
Language English
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Snippet •Diffusion approximation captures evolutionary dynamics.,•Uniform extinction suppresses cooperation in structured populations.,•Targeted extinction can promote...
This study investigates the evolution of cooperation in a deme-structured population where individuals interact via the Prisoner's Dilemma. Reproduction is...
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StartPage 112212
SubjectTerms Animals
Biological Evolution
Cooperative Behavior
Diffusion approximation
Extinction, Biological
Extinction-recolonization Mathematics Subject Classification
Fixation probability
Humans
Identity by descent
Island model
Models, Biological
Population Dynamics
Primary 91A25
Prisoner Dilemma
Prisoner’s dilemma
Reproduction
Secondary 60J70
Title The role of selective extinction in promoting cooperation in a many demes model
URI https://dx.doi.org/10.1016/j.jtbi.2025.112212
https://www.ncbi.nlm.nih.gov/pubmed/40659180
https://www.proquest.com/docview/3230215051
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