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arXiv 2106.09183math.DS
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一类具有状态依赖成熟时滞的捕食者-食饵模型的全局动力学

Global Dynamics of a Predator-Prey Model with State-Dependent Maturation-Delay

Qianqian Zhang, Yuan Yuan, Yunfei Lv, Shengqiang Liu

摘要:

本文建立并分析了一类具有一般非线性功能反应的阶段结构捕食者-食饵模型。状态依赖时滞(state-dependent time delay,SDTD)是指捕食者从出生到成熟所需的时间,它是关于成熟捕食者数量的单调递增、连续可微、有界函数。该模型与以往的SDTD模型有很大的不同,在这个意义上,延迟对时间的导数涉及到模型。首先,我们已经证明,对于一大类常用的功能反应类型,包括Holling I型,II型和III型,Beddington-DeAngelis型,(以下简称BD型)等,捕食者与食饵永久共存当且仅当捕食者的净再生数大于一个单位;其次,讨论了该模型平衡点的局部稳定性;最后,对于BD型功能性反应的特殊情形,我们证明了如果系统是永久的,即SDTD对状态的导数足够小,捕食者干扰足够大,则共存平衡点是全局渐近稳定的.

英文摘要:

In this paper, a stage structured predator-prey model with general nonlinear type of functional response is established and analyzed. The state-dependent time delay (hereafter SDTD) is the time taken from predator's birth to its maturity, formatted as a monotonical (ly) increasing, continuous(ly) differentiable and bounded function on the number of mature predator. The model is quite different from many previous models with SDTD, in the sense that the derivative of delay on the time is involved in the model. First, we have shown that for a large class of commonly used types of functional responses, including Holling types I, II and III, Beddington-DeAngelis-type (hereafter BD-type), etc, the predator coexists with the prey permanently if and only if the predator's net reproduction number is larger than one unit; Secondly, we have discussed the local stability of the equilibria of the model; Finally, for the special case of BD-type functional response, we claim that if the system is permanent, that is, the derivative of SDTD on the state is small enough and the predator interference is large enough, then the coexistence equilibrium is globally asymptotically stable.

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