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Adaptive survival movement strategy to local epidemic outbreaks in cyclic models

J. MenezesB. MouraE. Rangel
Jul 2022
摘要
We study the generalised rock-paper-scissors game with five species whoseorganisms face local epidemic outbreaks. As an evolutionary behaviouralsurvival strategy, organisms of one out of the species move in the directionwith more enemies of their enemies to benefit from protection againstselection. We consider that each organism scans the environment, performingsocial distancing instead of agglomerating when perceiving that the density ofsick organisms is higher than a tolerable threshold. Running stochasticsimulations, we study the interference of the adaptive movement survivalstrategy in spatial pattern formation, calculating the characteristic lengthscale of the typical spatial domains inhabited by organisms of each species. Wecompute how social distancing trigger impacts the chances of an individualbeing killed in the cyclic game and contaminated by the disease. The outcomesshow that the species predominates in the cyclic game because of the organisms'local adaptation. The territory occupied by the species grows with theproportion of individuals learning to trigger the social distancing tactic. Wealso show that organisms that perceive large distances more properly executethe adaptive strategy, promptly triggering the social distancing tactic andchoosing the correct direction to move. Our findings may contribute tounderstanding the role of adaptive behaviour when environmental changesthreaten biodiversity.
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