群体防御下消费者资源系统中的局部交互影响资源扩散

IF 1.2 4区 环境科学与生态学 Q4 ECOLOGY
Jorge Arroyo-Esqu, A. Hastings, Marissa L. Baskett
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引用次数: 0

摘要

积分差分方程是一个离散的时间-空间显式模型,描述了生态种群在空间中的扩散。该框架有助于研究生物体的传播动力学以及生态相互作用如何影响其传播。在研究消费等相互作用时,传播率可能会随着生命周期阶段的不同而变化,例如分散的青少年和固着的成年人。在非分散阶段,资源可能会进行群体防御,以保护自己免受消耗。这些局部的非分散性相互作用可能会限制产生的分散新兵的数量,从而影响种群的传播速度。我们使用整合参考框架提出了一个空间消费者资源系统,其成年阶段和群体防御机制在资源群体中的移动有限。我们使用IV型霍林功能反应对群体防御进行建模,这限制了成年资源群体的生存,并提高了青少年消费者的生产。我们发现,固着成虫的高死亡率会破坏资源的承载能力。此外,我们发现,在高资源密度下,由于种内竞争超过了消耗对资源增长的影响,群体防御导致新入侵地区资源的局部增长放缓。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Local Interactions Affect Spread of Resource in a Consumer-resource System With Group Defense
Integrodifference equations are a discrete time spatially explicit model that describes dispersal of ecological populations through space. This framework is useful to study spread dynamics of organisms and how ecological interactions can affect their spread. When studying interactions such as consumption, dispersal rates might vary with life cycle stage, such as cases with dispersive juveniles and sessile adults. In the non-dispersive stage, resources may engage in group defense to protect themselves from consumption. These local nondispersive interactions may limit the number of dispersing recruits that are produced and therefore affect how fast populations can spread. We present a spatial consumer-resource system using an integrodifference framework with limited movement of their adult stages and group defense mechanisms in the resource population. We model group defense using a Type IV Holling functional response, which limits survival of adult resource population and enhances juvenile consumers production. We find that high mortality levels for sessile adults can destabilize resource at carrying capacity. Furthermore, we find that at high resource densities, group defense leads to a slower local growth of resource in newly invaded regions due to intraspecific competition outweighing the effect of consumption on resource growth.
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来源期刊
Theoretical Ecology
Theoretical Ecology 环境科学-生态学
CiteScore
3.30
自引率
6.20%
发文量
23
审稿时长
>12 weeks
期刊介绍: Theoretical Ecology publishes innovative research in theoretical ecology, broadly defined. Papers should use theoretical approaches to answer questions of ecological interest and appeal to and be readable by a broad audience of ecologists. Work that uses mathematical, statistical, computational, or conceptual approaches is all welcomed, provided that the goal is to increase ecological understanding. Papers that only use existing approaches to analyze data, or are only mathematical analyses that do not further ecological understanding, are not appropriate. Work that bridges disciplinary boundaries, such as the intersection between quantitative social sciences and ecology, or physical influences on ecological processes, will also be particularly welcome. All areas of theoretical ecology, including ecophysiology, population ecology, behavioral ecology, evolutionary ecology, ecosystem ecology, community ecology, and ecosystem and landscape ecology are all appropriate. Theoretical papers that focus on applied ecological questions are also of particular interest.
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