一类具有Lévy跳的随机三种群食物网模型
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国家自然科学基金(11471197)


A stochastic three-species food web model with Lévy jumps
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    摘要:

    为了深入研究具有双参数扰动及Lévy跳的随机三种群食物网模型的动力学性质,首先给出了模型全局正解的存在唯一性;然后通过构造Lyapunov函数,并且应用It公式和Chebyshev不等式证明了该模型的随机最终有界性;接着利用指数鞅不等式和Borel-Cantelli引理分析了种群灭绝的充分条件;最后运用数值模拟验证了相应理论结果的合理性。研究结果表明,在Lévy噪声的影响下模型是随机最终有界的,并且较大的Lévy噪声可以导致种群的灭绝。研究方法在理论证明和数值模拟方面都得到了良好的预期结果,对于探究其他随机种群模型的一些问题具有一定的借鉴意义。

    Abstract:

    For a stochastic three-species food web model with double parameters perturbation and Lévy jumps, we give the existence and uniqueness of global positive solution,which is beneficial to further study its dynamic properties. Then, by constructing Lyapunov function and applying It′s formula and Chebyshev’s inequality, it is found that the model is stochastic and ultimately bounded. Moreover, the sufficient conditions of extinction are obtained by using exponential martingale inequality and Borel-Cantelli’s lemma. Finally, some numerical simulations are introduced to illustrate the rationality of the theoretical results. The results show that the model is stochastic and ultimately bounded under the influence of Lévy noise, and large Lévy noise can lead to the extinction of populations. The algorithm has obtained good results both in theory and numerical simulations, which provides certain significance for many problems of stochastic population models.

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冀 星,刘桂荣.一类具有Lévy跳的随机三种群食物网模型[J].河北科技大学学报,2019,40(4):301-306

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  • 收稿日期:2019-05-09
  • 最后修改日期:2019-06-17
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  • 在线发布日期: 2019-08-30
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