数学物理学报 ›› 2021, Vol. 41 ›› Issue (4): 1192-1203.

• 论文 • 上一篇    下一篇

具有Crowley-Martin型功能反应的捕食者-食饵模型的复杂动力学和随机敏感性分析

王腾飞(),冯涛(),孟新柱*()   

  1. 山东科技大学 数学与系统科学学院 山东青岛 266590
  • 收稿日期:2019-10-29 出版日期:2021-08-26 发布日期:2021-08-09
  • 通讯作者: 孟新柱 E-mail:tengfei_wang2014@126.com;tfeng.math@gmail.com;skdmxz12@163.com
  • 作者简介:王腾飞, E-mail: tengfei_wang2014@126.com|冯涛, E-mail: tfeng.math@gmail.com
  • 基金资助:
    山东省自然科学基金项目(ZR2019MA003);山东省泰山学者项目研究基金

Complex Dynamics and Stochastic Sensitivity Analysis of a Predator-Prey Model with Crowley-Martin Type Functional Response

Tengfei Wang(),Tao Feng(),Xinzhu Meng*()   

  1. College of Mathematics and Systems Science, Shandong University of Science and Technology, Shandong Qingdao 266590
  • Received:2019-10-29 Online:2021-08-26 Published:2021-08-09
  • Contact: Xinzhu Meng E-mail:tengfei_wang2014@126.com;tfeng.math@gmail.com;skdmxz12@163.com
  • Supported by:
    the NSF of Shandong Province(ZR2019MA003);the Research Fund for the Taishan Scholar Project of Shandong Province

摘要:

捕食者与食饵的相互作用在保护物种多样性方面起着关键作用.该文提出了一个具有Crowley-Martin型功能反应的随机捕食者-食饵模型.结果表明,当$λ$ < 0时,捕食者种群有灭绝的趋势,食饵种群的解弱收敛到一个不变的概率分布.当$λ$>0时,发现随机系统存在唯一一个遍历平稳分布.此外,该文还提出了随机敏感性分析方法来研究噪声对捕食者-食饵种群动力学的影响.研究结果表明,较小强度的噪声可以抑制种群规模的扩大,而较大强度的噪声则会导致种群的灭绝.

关键词: 捕食者-食饵相互作用, 随机模型, 随机敏感性分析, 遍历性, 平稳分布

Abstract:

Predator-prey interactions serve a pivotal role in protecting species diversity. In this study, the parameter $λ$ is presented to show the stochastic dynamics of a predator-prey model. The results show that the predator population tends to become extinct if $λ$ < 0. Furthermore, the solution of the prey population converges weakly to an invariant probability distribution. If $λ$>0, we find that the stochastic system admits a unique ergodic stationary distribution. In addition, stochastic sensitivity analysis is proposed to study the effects of noise on the dynamics of predator-prey populations. Our findings suggest that small-intensity noise can suppress population size enlargement, while large-intensity noise can lead to the extinction of populations.

Key words: Predator-prey interaction, Stochastic model, Stochastic sensitivity analysis, Ergodic property, Stationary distribution

中图分类号: 

  • O175