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arXiv 2007.16140math.DSnlin.CD
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具有离散时滞的简单捕食模型的混沌动力学

Chaotic dynamics in a simple predator-prey model with discrete delay

Guihong Fan, Gail S. K. Wolkowicz

摘要:

在最简单的经典Gause型捕食-被捕食模型中,引入了一个离散时滞来描述捕获猎物和将其转化为可生存生物量之间的时间,该模型具有无时滞的平衡动力学.当时滞从零开始增加时,共存平衡态经历了一个超临界Hopf分岔,两个极限环的鞍结分岔,以及一系列的周期分岔,最终导致混沌.由此产生的周期轨道和奇怪的吸引子类似于麦基-格拉斯方程的对应物。由于无时滞系统的全局稳定性,这些复杂的动态特性可以完全归因于时滞的引入。由于许多模型包括捕食者-猎物一样的相互作用作为子模型,本研究强调了理解的重要性,忽略延迟在这样的模型的可靠性基于模型的预测,特别是因为温度是已知的影响,某些延迟的长度。

英文摘要:

A discrete delay is included to model the time between the capture of the prey and its conversion to viable biomass in the simplest classical Gause type predator-prey model that has equilibrium dynamics without delay. As the delay increases from zero, the coexistence equilibrium undergoes a supercritical Hopf bifurcation, two saddle-node bifurcations of limit cycles, and a cascade of period doublings, eventu1ally leading to chaos. The resulting periodic orbits and the strange attractor resemble their counterparts for the Mackey-Glass equation. Due to the global stability of the system without delay, these complicated dynamics can be solely attributed to the introduction of the delay. Since many models include predator-prey like interactions as submodels, this study emphasizes the importance of understanding the implications of overlooking delay in such models on the reliability of the model-based predictions, especially since the temperature is known to have an effect on the length of certain delays.

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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