Optimal harvesting policy of a stochastic two-species competitive model with Lévy noise in a polluted environment

Optimal harvesting policy of a stochastic two-species competitive model with Lévy noise in a polluted environment
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污染环境中带有 Lévy 噪声的随机两物种竞争模型的最优采伐策略

DOI:
10.1016/j.physa.2017.02.019
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发表时间:
2017-07
期刊:
Physica A
影响因子:
--
通讯作者:
Sanling Yuan
Sanling Yuan
中科院分区:
其他
文献类型:
--
作者:
Yu Zhao;Sanling Yuan

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众所周知,突如其来的环境冲击和毒物会影响鱼类物种的种群动态,因此需要发展对突发性环境变化和毒物如何影响最优捕捞政策的机械性理解。本文研究了污染环境中具有L噪声的随机两种群竞争模型的最优收获问题,其中L噪声用来描述气候突变。由于L噪声的不连续性,经典的基于福克-普朗克方程显式解的最优捕获方法是无效的。本文的目的是填补这一空白,制定最优的收获策略。利用聚集和遍历的方法,得到了最优收获努力和可持续产量的最大期望的近似值。数值模拟结果支持了这些理论结果。我们的分析表明,L噪声和生物体内毒物的平均应激措施可能会对最优收获策略产生显著影响。
As well known that the sudden environmental shocks and toxicant can affect the population dynamics of fish species, a mechanistic understanding of how sudden environmental change and toxicant influence the optimal harvesting policy requires development. This paper presents the optimal harvesting of a stochastic two-species competitive model with Lévy noise in a polluted environment, where the Lévy noise is used to describe the sudden climate change. Due to the discontinuity of the Lévy noise, the classical optimal harvesting methods based on the explicit solution of the corresponding Fokker–Planck equation are invalid. The object of this paper is to fill up this gap and establish the optimal harvesting policy. By using of aggregation and ergodic methods, the approximation of the optimal harvesting effort and maximum expectation of sustainable yields are obtained. Numerical simulations are carried out to support these theoretical results. Our analysis shows that the Lévy noise and the mean stress measure of toxicant in organism may affect the optimal harvesting policy significantly.
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