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arXiv 1503.08168q-bio.PEnlin.AO
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复杂生态景观中的集合种群动态

Metapopulation dynamics in a complex ecological landscape

E. H. Colombo, C. Anteneodo

摘要:

本文提出了一个研究集合种群动态中空间扩散与环境时空波动相互作用的一般模型。有利斑块的生态景观就像Lévy灰尘一样产生,它允许建立一系列模式,从分散到聚集。在本地,动力学是由一个典型的人口密度的演变模型,包括一个逻辑表达式加上乘性噪声驱动。空间耦合是通过两种传播机制引入的:扩散扩散和选择性迁移驱动的补丁适合性。我们专注于长期的人口规模作为一个功能的栖息地配置,环境波动和耦合方案。我们得到了有利斑块的空间分布和耦合机制必须满足的条件,以保证种群的生存。我们观察到的基本现象是环境波动和防止灭绝的空间传播之间的正反馈。

英文摘要:

We propose a general model to study the interplay between spatial dispersal and environment spatiotemporal fluctuations in metapopulation dynamics. An ecological landscape of favorable patches is generated like a Lévy dust, which allows to build a range of patterns, from dispersed to clustered ones. Locally, the dynamics is driven by a canonical model for the evolution of the population density, consisting of a logistic expression plus multiplicative noises. Spatial coupling is introduced by means of two spreading mechanisms: diffusive dispersion and selective migration driven by patch suitability. We focus on the long-time population size as a function of habitat configurations, environment fluctuations and coupling schemes. We obtain the conditions, that the spatial distribution of favorable patches and the coupling mechanisms must fulfill, to grant population survival. The fundamental phenomenon that we observe is the positive feedback between environment fluctuations and spatial spread preventing extinction.

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。

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