双变型立体系统中的分叉值:以避难所为媒介的临界过渡和延迟诱导的振荡模式
1School of Mathematics and Statistics, Chongqing Jiaotong University, Chongqing 400074, PR China.
Mathematical biosciences
|October 13, 2025
概括
种类使用避难所来避开捕食者,但过多或过少的避难所可能会破坏种群的稳定. 时间延迟和避难级别极大地影响了生态动态和稳定.
科学领域:
- 生态生态学 生态生态学
- 数学生物学 数学生物学
- 人口动态 人口动态
背景情况:
- 种类相互作用形成复杂的生态网络.
- 捕食风险驱动适应性生存策略,如使用避难所.
- 了解这些动态对于生态系统的稳定至关重要.
研究的目的:
- 为了建模一个带有时间延迟和避难机制的双营养链.
- 分析参数如何影响人口动态和进化模式.
- 研究不同条件下的生态平衡的稳定性.
主要方法:
- 开发了一种双的食物链化器模型.
- 执行系统平衡的稳定性分析.
- 利用了分叉分析 (跨临界和Hopf) 和中心多重体理论.
主要成果:
- 避难参数对人口稳定性有重大影响;两种极端 (过多/过少) 都会破坏稳定.
- 时间延迟可以诱导霍普夫分叉,导致人口振荡.
- 两叉分析揭示了从稳定的平衡过渡到持续的振荡.
结论:
- 难民战略对人口平衡有双重影响.
- 时间延迟是生态不稳定的重要驱动因素.
- 模型预测通过跨多种参数模式的数值模拟来验证.
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