arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.06360q-bio.PEphysics.soc-ph
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具有首选移动方向的石头剪刀布模型

Rock-paper-scissors models with a preferred mobility direction

P. P. Avelino, B. F. de Oliveira, J. V. O. Silva

摘要:

我们研究了一个修改的空间随机Lotka-Volterra制定的石头剪刀布模型使用非格子随机模拟。在该模型中,一个物种优先在特定方向上移动-偏好水平由噪声强度参数$η\in [0, 1]$控制($η= 0$和$η= 1$分别对应于总偏好和无偏好)-而其他两个物种没有参考的运动方向。我们从随机初始条件开始研究系统的行为,表明具有非对称流动性的物种总是比其捕食者具有优势。我们还确定了噪声强度参数的最佳值,这使得该物种的最大优势。最后,我们发现,临界数量的个人,低于灭绝的概率变得显着,随着噪声水平的增加而减少,从而表明,在本论文中研究的一个优选的流动性方向的增加并不有利于共存。

英文摘要:

We investigate a modified spatial stochastic Lotka-Volterra formulation of the rock-paper-scissors model using off-lattice stochastic simulations. In this model one of the species moves preferentially in a specific direction -- the level of preference being controlled by a noise strength parameter $η\in [0, 1]$ ($η= 0$ and $η= 1$ corresponding to total preference and no preference, respectively) -- while the other two species have no referred direction of motion. We study the behaviour of the system starting from random initial conditions, showing that the species with asymmetric mobility has always an advantage over its predator. We also determine the optimal value of the noise strength parameter which gives the maximum advantage to that species. Finally, we find that the critical number of individuals, below which the probability of extinction becomes significant, decreases as the noise level increases, thus showing that the addition of a preferred mobility direction studied in the present paper does not favour coexistence.

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