Ecosystem size and complexity as extrinsic drivers of food chain length in branching ecosystems

Ecosystem size and complexity as extrinsic drivers of food chain length in branching ecosystems
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生态系统规模和复杂性作为分支生态系统食物链长度的外在驱动因素

DOI:
10.1002/ecs2.4648
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发表时间:
2023
期刊:
影响因子:
2.7
通讯作者:
Terui, Akira
Terui, Akira
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Pomeranz, Justin P. F.;Finlay, Jacques C.;Terui, Akira

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自从埃尔顿在20世纪初提出“食物周期”以来,了解自然群落中食物链长度的驱动因素一直引起生态学家的兴趣。食物链长度的驱动因素包括生产力、干扰机制、生态系统规模和营养杂食动物。然而,目前的理论在很大程度上假设了简单的二维栖息地结构,可能不足以预测具有复杂分支结构的生态系统中的食物链长度。在这里,我们开发了一个空间明确的理论模型,提供了一个完整的框架,了解分支网络中的食物链长度的变化。我们表现出独立的,积极的影响,生态系统的大小和复杂性(如分支特性)对食物链的长度。然而,生态系统规模和复杂性的影响取决于其他因素,在高干扰和高生产力的制度中表现得更明显。我们的研究结果表明,生态系统的复杂性是一个重要的,但被忽视的驱动程序的食物链长度,可能会增加对人为环境变化的弹性。
Understanding the drivers of food chain length in natural communities has intrigued ecologists since Elton publicized “food cycles” in the early 20th century. Proposed drivers of food chain length have included productivity, disturbance regime, ecosystem size, and trophic omnivory. However, current theories have largely assumed simple, two‐dimensional habitat architectures and may not be adequate to predict food chain length in ecosystems with a complex, branching structure. Here, we develop a spatially explicit theoretical model that provides an integrated framework for understanding variation in food chain length in branching networks. We show independent, positive influences of ecosystem size and complexity (as indicated by branching properties) on food chain length. However, the effects of ecosystem size and complexity were contingent upon other factors, appearing more clearly in high‐disturbance and high‐productivity regimes. Our results suggest that ecosystem complexity is an important yet overlooked driver of food chain length that may increase the resilience to anthropogenic environmental changes.
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