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arXiv 1003.2427q-bio.PE
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循环共同进化的石头剪刀布动力学中的平均灭绝时间

Mean extinction times in cyclic coevolutionary rock-paper-scissors dynamics

Markus Schütt, Jens Christian Claussen

摘要:

能够稳定生物学中共存或多样性的动力学机制通常具有根本意义。与许多双策略进化游戏不同,具有三种策略和循环优势的游戏,如石头剪刀布游戏(RPS),稳定了共存,从而保护了系统中的生物多样性。在无限种群的限制下,类似于传统的演化博弈论,复制子方程预言相空间内部存在一个不动点。但在有限种群中,由于随机波动的影响,策略频率会超出不动点,甚至灭绝。对于三个不同的过程和零和和非零和RPS以及,我们提出了广泛的模拟结果的平均消光时间(MET),根据代理的数量N,我们介绍了两种分析方法的MET的推导。

英文摘要:

Dynamical mechanisms that can stabilize the coexistence or diversity in biology are generally of fundamental interest. In contrast to many two-strategy evolutionary games, games with three strategies and cyclic dominance like the rock-paper-scissors game (RPS) stabilize coexistence and thus preserve biodiversity in this system. In the limit of infinite populations, resembling the traditional picture of evolutionary game theory, replicator equations predict the existence of a fixed point in the interior of the phase space. But in finite populations, strategy frequencies will run out of the fixed point because of stochastic fluctuations, and strategies can even go extinct. For three different processes and for zero-sum and non-zero-sum RPS as well, we present results of extensive simulations for the mean extinction time (MET), depending on the number of agents N, and we introduce two analytical approaches for the derivation of the MET.

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