Asymptotic Behaviour and Extinction of Delay Lotka-Volterra Model with Jump-Diffusion

Asymptotic Behaviour and Extinction of Delay Lotka-Volterra Model with Jump-Diffusion
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跳跃扩散延迟Lotka-Volterra模型的渐近行为和消退

DOI:
10.1155/2014/249504
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发表时间:
2014-01
影响因子:
--
通讯作者:
Song Guohua
Song Guohua
中科院分区:
--
文献类型:
--
作者:
Li Dan;Cui Jing'an;Song Guohua

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本文研究了跳跃-扩散随机环境扰动对Lotka-Volterra种群动力学的渐近行为和消光的影响。本文的贡献在于:(a)为了考虑具有跳变的时滞随机微分方程,我们引入了一个适当的初始数据空间,其中初始数据可以是具有向下跳变的不连续函数;(b)证明了与模型相关的具有跳跃的时滞随机微分方程具有唯一的全局正解,并给出了保证模型随机最终有界性、时间矩平均有界性和渐近多项式增长的充分条件;(c)得到了系统灭绝的充分条件,推广了之前的结果,表明足够大的随机跳跃幅度和强度(跳跃事件到达的平均速率)可能导致种群灭绝。
This paper studies the effect of jump-diffusion random environmental perturbations on the asymptotic behaviour and extinction of Lotka-Volterra population dynamics with delays. The contributions of this paper lie in the following: (a) to consider delay stochastic differential equation with jumps, we introduce a proper initial data space, in which the initial data may be discontinuous function with downward jumps; (b) we show that the delay stochastic differential equation with jumps associated with our model has a unique global positive solution and give sufficient conditions that ensure stochastically ultimate boundedness, moment average boundedness in time, and asymptotic polynomial growth of our model; (c) the sufficient conditions for the extinction of the system are obtained, which generalized the former results and showed that the sufficiently large random jump magnitudes and intensity (average rate of jump events arrival) may lead to extinction of the population.
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