Permanence and extinction for a single-species system with jump-diffusion

Permanence and extinction for a single-species system with jump-diffusion
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具有跳跃扩散的单物种系统的持久性和灭绝

DOI:
10.1016/j.jmaa.2015.04.050
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发表时间:
2015-10
影响因子:
1.3
通讯作者:
Guohua Song
Guohua Song
中科院分区:
数学3区
文献类型:
--
作者:
Dan Li;Jing'an Cui;Guohua Song

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在本研究中,我们考虑了跳跃-扩散随机环境扰动对单物种扩散周期系统在差斑块环境中的持久性和灭绝的影响,并考虑了物种在斑块间扩散过程中损失的可能性。首先,我们证明了系统有一个唯一的全局正解,且该解具有任意初始正的概率为1,并得到了随机保证种群系统最终有界性和渐近多项式增长的充分条件。其次,给出了系统的均值几乎确定持久、随机持久和消光的充分条件。特别地,通过构造一个适当的积分因子,我们得到了贴片几乎确定弱持久的充分条件。所得到的永久条件推广了先前在无随机环境扰动的系统上建立的充分条件。最后,我们讨论了主要结果的生物学意义。
In this study, we consider the effect of jump-diffusion random environmental perturbations on the permanence and extinction of a single-species dispersal periodic system in poor patchy environments with the possibility of species loss during their dispersion among patches. First, we prove that there is a unique global positive solution to the system with any initial positive value with probability 1, and we obtain the sufficient conditions that stochastically ensure the ultimate boundedness as well as the asymptotic polynomial growth of the population system. Next, we establish the sufficient conditions for the almost sure permanence in the mean, stochastic permanence, and extinction of the system. In particular, by constructing an appropriate integrating factor, we obtain the sufficient conditions for the almost sure weak permanence of the patch. The conditions obtained for permanence generalize the sufficient conditions established previously on the system without random environmental perturbations. Finally, we discuss the biological implications of the main results.
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