资源生产率的变化驱动了集团内部掠夺系统中的社区动态
1School of Mathematical Science, Yangzhou University, Yangzhou 225002 China.
Bio Systems
|December 24, 2025
概括
资源生产率的波动显著影响食物网. 更高的幅度变化,而不是其周期,驱动了捕食者动态,导致生物质转移和潜在的崩,影响了整体生态系统的稳定性.
科学领域:
- 生态生态学 生态生态学
- 生态系统动力学 生态系统动力学
- 理论生态学理论生态学
背景情况:
- 热带能量转移对于社区结构和稳定性至关重要.
- 初级生产率的波动可能会威胁到物种在更高的食物营养水平的持续存在.
研究的目的:
- 为了研究资源生产率的变化如何影响食用相互作用和生物质分布,使用一个内掠食模型.
- 确定这些生态动态的关键驱动因素 (幅度与周期).
主要方法:
- 利用一个阶段结构的协会内部掠食模型,结合了资源,消费者和掠食者动态.
- 分析了不同资源生产率幅度 (ψ) 和周期 (Y) 对人口生物质和稳定性的影响.
- 检查了最大资源密度 (Rmax) 和捕食者天生饮食转移 (θ) 对系统平衡状态的影响.
主要成果:
- 资源生产率波动的幅度 (ψ),而不是周期 (Y),主要驱动生态动态.
- 增加的 ψ 导致捕食者生物量从幼转向成年主导地位,导致饥饿恢复周期并调节消费者生物量.
- 热带反应是不对称的:资源生物量保持稳定,消费者生物量略有增加,但掠食者生物量随着 ψ 的增加而下降,在 ψ > 0.5.5 时崩.
- 系统平衡状态 (例如,共存,捕食者-资源) 由Rmax和 θ确定, ψ调节这些相互作用.
结论:
- 资源生产率的变化,特别是它的幅度,深刻地重塑了生态社区中的食用相互作用和生物质分布.
- 捕食者种群对资源波动高度敏感,经历繁荣和衰退的周期,可能导致崩.
- 资源可用性 (Rmax) 和捕食者生命史特征 (θ) 之间的相互作用决定了生态系统的稳定性,变性 (ψ) 作为一个关键的调节器.
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