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具有比率依赖和Holling III型功能反应的捕食者-猎物模型中灭绝附近的复杂动力学

Complex dynamics near extinction in a predator-prey model with ratio dependence and Holling type III functional response

K. B. Blyuss, Y. N. Kyrychko, O. B. Blyuss

AI总结:

该研究分析带比率依赖和Holling III型功能反应的捕食者-猎物模型的灭绝附近动力学,通过变换解析稳态存在性,探明参数对稳定性的影响及多稳态共存、周期振荡等行为,并用数值模拟验证。

摘要:

本文分析了近期提出的一类具有比率依赖和Holling III型功能反应的捕食者-猎物模型,重点研究灭绝状态附近的动力学行为。通过Briot-Bouquet变换,我们将原模型转化为一个新系统,其中灭绝稳态可对应至多3个不同的稳态,这些稳态的存在性由相应Lambert W函数的取值决定。我们探究了捕食率、捕食者繁殖力以及表征功能反应强度的参数如何影响灭绝稳态和共存稳态的稳定性。结果表明,当捕食率足够高且捕食者繁殖力足够低时,灭绝稳态可以是稳定的。此外,在特定参数区间内,稳定的灭绝稳态可与稳定的仅猎物平衡态或稳定的共存平衡态共存,此时初始条件决定了猎物种群和捕食者种群是维持在某一稳定水平,还是二者均会灭绝。另一种可能是共存稳态不稳定,此时会观测到围绕该稳态的持续周期振荡。我们通过数值模拟展示了所有动力学区间的行为,并在每种情形下给出了变换后系统的相应相平面,以验证其与稳定、不稳定灭绝稳态的对应关系。

英文摘要:

In this paper, we analyse a recently proposed predator-prey model with ratio dependence and Holling type III functional response, with particular emphasis on the dynamics close to extinction. By using Briot-Bouquet transformation we transform the model into a system, where the extinction steady state is represented by up to three distinct steady states, whose existence is determined by the values of appropriate Lambert W functions. We investigate how stability of extinction and coexistence steady states is affected by the rate of predation, predator fecundity, and the parameter characterising the strength of functional response. The results suggest that the extinction steady state can be stable for sufficiently high predation rate and for sufficiently small predator fecundity. Moreover, in certain parameter regimes, a stable extinction steady state can coexist with a stable prey-only equilibrium or with a stable coexistence equilibrium, and it is rather the initial conditions that determine whether prey and predator populations will be maintained at some steady level, or both of them will become extinct. Another possibility is for coexistence steady state to be unstable, in which case sustained periodic oscillations around it are observed. Numerical simulations are performed to illustrate the behaviour for all dynamical regimes, and in each case a corresponding phase plane of the transformed system is presented to show a correspondence with stable and unstable extinction steady state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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