arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.1082q-bio.PE
收藏

随机复制子演化动力学中的秩丰度关系

Rank abundance relations in evolutionary dynamics of random replicators

Yoshimi Yoshino, Tobias Galla, Kei Tokita

摘要:

提出了随机群落生态学模型中秩多度关系的非平衡统计力学描述。具体来说,我们研究了一个多物种的复制子系统与淬火随机相互作用矩阵。我们在这里考虑对称相互作用以及非对称和反对称的情况。RAR是通过生成函数分析,描述一个小的一组序参数方面的系统的定点状态,并在依赖于对称性或其他相互作用和社会的生产力分析。我们的工作是Tokita [Phys. Rev. Lett. { \bf 93} 178102(2004)],其中在平衡设置内考虑对称相互作用的情况。在我们的模型中,物种多度分布是截断的正态分布或其变换,在某些情况下,类似于生态学中观察到的左偏分布。我们还讨论了稳定物种的食物网的相互作用结构,异质合作压力的情况下,以及有限的系统大小和高阶相互作用的影响。

英文摘要:

We present a non-equilibrium statistical mechanics description of rank abundance relations (RAR) in random community models of ecology. Specifically, we study a multi-species replicator system with quenched random interaction matrices. We here consider symmetric interactions as well as asymmetric and anti-symmetric cases. RARs are obtained analytically via a generating functional analysis, describing fixed-point states of the system in terms of a small set of order parameters, and in dependence on the symmetry or otherwise of interactions and on the productivity of the community. Our work is an extension of Tokita [Phys. Rev. Lett. {\bf 93} 178102 (2004)], where the case of symmetric interactions was considered within an equilibrium setup. The species abundance distribution in our model come out as truncated normal distributions or transformations thereof and, in some case, are similar to left-skewed distributions observed in ecology. We also discuss the interaction structure of the resulting food-web of stable species at stationarity, cases of heterogeneous co-operation pressures as well as effects of finite system size and of higher-order interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑