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arXiv 1407.0621q-bio.PEcond-mat.stat-mechnlin.PSq-bio.QM
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空间石头剪刀布游戏中螺旋图案的表征

Characterization of spiraling patterns in spatial rock-paper-scissors games

Bartosz Szczesny, Mauro Mobilia, Alastair M. Rucklidge

摘要:

种群间相互作用的时空格局往往影响着物种多样性〈动〉性<动>的维持,是一个研究热点。在这里,我们研究的时空格局所产生的三个物种之间的循环竞争在两个维度。受最近实验的启发,我们考虑了一个通用的集合种群模型,包括通过显性去除和替换,繁殖,突变,配对交换和跳跃的个人的“石头剪刀布”的相互作用。通过结合分析和数值方法,我们得到了模型的相图附近的Hopf分岔和定量表征的螺旋图案在每个阶段中出现的属性。还研究了远离Hopf分岔(低突变率)的循环竞争阶段。我们的分析方法依赖于仔细分析的复杂的Ginzburg-Landau方程的属性,通过控制(微扰)多尺度扩展模型的Hopf分叉。我们的研究结果使我们能够澄清空间的“石头剪刀布”竞争时,导致稳定的螺旋波,在何种情况下,他们受到非线性流动性。

英文摘要:

The spatio-temporal arrangement of interacting populations often influences the maintenance of species diversity and is a subject of intense research. Here, we study the spatio-temporal patterns arising from the cyclic competition between three species in two dimensions. Inspired by recent experiments, we consider a generic metapopulation model comprising "rock-paper-scissors" interactions via dominance removal and replacement, reproduction, mutations, pair-exchange and hopping of individuals. By combining analytical and numerical methods, we obtain the model's phase diagram near its Hopf bifurcation and quantitatively characterize the properties of the spiraling patterns arising in each phase. The phases characterizing the cyclic competition away far from the Hopf bifurcation (at low mutation rate) are also investigated. Our analytical approach relies on the careful analysis of the properties of the complex Ginzburg-Landau equation derived through a controlled (perturbative) multiscale expansion around the model's Hopf bifurcation. Our results allows us to clarify when spatial "rock-paper-scissors" competition leads to stable spiral waves and under which circumstances they are influenced by nonlinear mobility.

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