Robust permanence for ecological equations with internal and external feedbacks.

Robust permanence for ecological equations with internal and external feedbacks.
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DOI:
10.1007/s00285-017-1187-5
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发表时间:
2018-07
影响因子:
1.9
通讯作者:
Schreiber SJ
Schreiber SJ
中科院分区:
数学4区
文献类型:
--
作者:
Patel S;Schreiber SJ

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物种既经历与性状进化等内源性因素的内部反馈,又经历与天气等外源性因素的外部反馈。这些反馈可以在确定种群是否持续存在或物种群落是否共存方面发挥重要作用。为了提供一个一般的数学框架,研究这些影响,我们开发了一个定理的共存生态模型占内部和外部反馈。具体而言,我们使用平均李雅普诺夫函数和莫尔斯分解发展强大的持久性,一种形式的共存强大的人口密度的大扰动和小结构扰动的模型的充分和必要条件。我们说明了我们的研究结果可以应用于验证持久性的非自治模型,结构化的人口模型,包括那些与频率相关的反馈,和生态进化动力学模型。在这些应用中,我们讨论了我们的结果与以前的结果与特定类型的反馈模型。
Species experience both internal feedbacks with endogenous factors such as trait evolution and external feedbacks with exogenous factors such as weather. These feedbacks can play an important role in determining whether populations persist or communities of species coexist. To provide a general mathematical framework for studying these effects, we develop a theorem for coexistence for ecological models accounting for internal and external feedbacks. Specifically, we use average Lyapunov functions and Morse decompositions to develop sufficient and necessary conditions for robust permanence, a form of coexistence robust to large perturbations of the population densities and small structural perturbations of the models. We illustrate how our results can be applied to verify permanence in non-autonomous models, structured population models, including those with frequency-dependent feedbacks, and models of eco-evolutionary dynamics. In these applications, we discuss how our results relate to previous results for models with particular types of feedbacks.
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