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arXiv 2302.02582math.DS
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猎物生长中具有生殖Allee效应的猎物-捕食者模型中静止与动态模式的解析检测

Analytical detection of stationary and dynamic patterns in a prey-predator model with reproductive Allee effect in prey growth

Subrata Dey, S Ghorai, Malay Banerjee

AI总结:

本文研究含生殖Allee效应与Beddington-DeAngelis功能反应的猎物-捕食者模型,通过分岔分析和数值模拟揭示静止、局部化及行波、混沌等动态模式的形成机制。

摘要:

种群动力学中的Allee效应通过全局分岔对抑制富化悖论具有重要影响,并且能够产生高度复杂的动力学。本文研究了生殖Allee效应的影响,该效应被纳入具有Beddington-DeAngelis功能反应的猎物-捕食者模型中猎物的生长率内。首先识别了时间模型的初步局部分岔和全局分岔。针对适当的参数取值范围,建立了时空系统非均匀稳态解的存在性与不存在性。该时空模型满足Turing不稳定性条件,但数值研究表明,与不稳定Turing本征模相对应的非均匀模式充当一种瞬态模式。在猎物种群中纳入生殖Allee效应对共存平衡具有失稳作用。在一系列参数取值下,利用数值分岔技术识别了静止解的多个分支,包括依赖于模的Turing解和局部化模式解。在特定参数和扩散率范围以及适当初始条件选择下,该模型还能够产生一些复杂的动态模式,如行波、移动脉冲解和时空混沌。对Beddington-DeAngelis功能反应参数化的合理选择,有助于推断具有Holling II型功能反应和比率依赖功能反应的类似猎物-捕食者模型所产生的模式。

英文摘要:

Allee effect in population dynamics has a major impact in suppressing the paradox of enrichment through global bifurcation, and it can generate highly complex dynamics. The influence of the reproductive Allee effect, incorporated in the prey's growth rate of a prey-predator model with Beddington-DeAngelis functional response, is investigated here. Preliminary local and global bifurcations are identified of the temporal model. Existence and non-existence of heterogeneous steady-state solutions of the spatio-temporal system are established for suitable ranges of parameter values. The spatio-temporal model satisfies Turing instability conditions, but numerical investigation reveals that the heterogeneous patterns corresponding to unstable Turing eigen modes acts as a transitory pattern. Inclusion of the reproductive Allee effect in the prey population has a destabilising effect on the coexistence equilibrium. For a range of parameter values, various branches of stationary solutions including mode-dependent Turing solutions and localized pattern solutions are identified using numerical bifurcation technique. The model is also capable to produce some complex dynamic patterns such as travelling wave, moving pulse solution, and spatio-temporal chaos for certain range of parameters and diffusivity along with appropriate choice of initial conditions Judicious choices of parametrization for the Beddington-DeAngelis functional response help us to infer about the resulting patterns for similar prey-predator models with Holling type-II functional response and ratio-dependent functional response.

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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