arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.05802q-bio.PEcond-mat.dis-nncond-mat.stat-mech
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基于非线性反馈的随机广义Lotka-Volterra动力学的生态群落

Ecological communities from random generalised Lotka-Volterra dynamics with non-linear feedback

Laura Sidhom, Tobias Galla

摘要:

我们调查的结果广义Lotka-Volterra动力学的生态社区的随机相互作用系数和非线性反馈。我们在模拟中表明,非线性反馈的饱和稳定的动态。这是证实了在分析生成功能的方法,广义Lotka-Volterra方程与分段线性饱和响应。对于这样的系统,我们能够得到自洽的关系,管理稳定的固定点相,并进行线性稳定性分析,以预测发病的不稳定行为。我们详细研究了随机相互作用系数的均值、方差和协方差以及非线性响应的饱和值的综合影响。我们发现,稳定性和多样性的增加与引入非线性反馈,其中降低饱和值具有类似的效果,以降低协方差。我们还发现,合作不再具有非线性反馈的稳定性的不利影响,和顺序参数意味着丰度和多样性是更少依赖于更强的饱和度的相互作用的对称性。

英文摘要:

We investigate the outcome of generalised Lotka-Volterra dynamics of ecological communities with random interaction coefficients and non-linear feedback. We show in simulations that the saturation of non-linear feedback stabilises the dynamics. This is confirmed in an analytical generating-functional approach to generalised Lotka-Volterra equations with piecewise linear saturating response. For such systems we are able to derive self-consistent relations governing the stable fixed-point phase, and to carry out a linear stability analysis to predict the onset of unstable behaviour. We investigate in detail the combined effects of the mean, variance and co-variance of the random interaction coefficients, and the saturation value of the non-linear response. We find that stability and diversity increases with the introduction of non-linear feedback, where decreasing the saturation value has a similar effect to decreasing the co-variance. We also find co-operation to no longer have a detrimental effect on stability with non-linear feedback, and the order parameters mean abundance and diversity to be less dependent on the symmetry of interactions with stronger saturation.

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