Dynamics of a general non-autonomous stochastic Lotka-Volterra model with delays

Dynamics of a general non-autonomous stochastic Lotka-Volterra model with delays
复制标题

具有时滞的一般非自治随机 Lotka-Volterra 模型的动力学

DOI:
10.11948/2016051
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发表时间:
2016
影响因子:
1.1
通讯作者:
Zhang Shuo
Zhang Shuo
中科院分区:
数学4区
文献类型:
--
作者:
Wang Qing;Yu Yongguang;Zhang Shuo

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摘要研究了一类具有时滞和随机扰动的非自治n种群Lotka-Volterra模型。对于该模型,建立了灭绝、平均非持久性、弱持久性和随机持久性的充分条件。讨论了随机噪声对随机模型性质的影响。在足够小的噪声和足够大的噪声可能导致模型灭绝的情况下,模型的性质持久性保持不变。得到了弱持续与灭绝之间的临界值。最后,通过数值仿真验证了理论分析结果。
Abstract In this paper, a general non-autonomous n-species Lotka-Volterra model with delays and stochastic perturbation is investigated. For this model, sufficient conditions for extinction, non-persistence in the mean, weak persistence and stochastic permanence are established. The influences of the stochastic noises to the properties of the stochastic model are discussed. The property permanence for the model is preserved with the sufficiently small noise and sufficiently large noise may cause extinction of the model. The critical value between weak persistence and extinction is obtained. Finally, numerical simulations are given to support the theoretical analysis results.
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