Ursula Gaedke,Xiaoxiao Li,Christian Guill,Lia Hemerik,Peter C. de Ruiter.   Seasonal Shifts in Trophic Interaction Strength Drive Stability of Natural Food Webs. Ecology Letters, 2025; 28:e70075 .  https://doi.org/10.1111/ele.70075

Correspondence: Ursula Gaedke (gaedke@uni-potsdam.de)

Received: 2 September 2024 | Revised: 7 January 2025 | Accepted: 8 January 2025

【理论研究】营养互作强度的季节性变化驱动了(湖泊)天然食物网的稳定性[Ecology Letters,2025]

【摘要翻译】要理解为什么尽管环境因素和种群密度变化很大，但自然界的食物网却非常稳定仍然是一项挑战。我们通过对康斯坦茨湖浮游食物网的生物量和产量进行长达 7 年的高频观测，研究了其结构和稳定性的动态变化，从而得出了 59 个季节性定量食物网描述。通过最大循环权重评估了渐近食物网稳定性的动态变化，揭示了潜在的稳定性机制。 尽管生物量、通量和生产力都有明显的动态变化，但最大环重(Maximum Loop Weight)显示出一种反复出现的季节性模式，并具有持续的高稳定性。这种稳定性来自食物网的季节性重组，其驱动力是环内的能量限制及其嵌入食物网结构。这种稳定的结构调整是由于在一个多样化的牧草动物群落中，新陈代谢活动和竞争性/捕食敏感性对环重量的反作用。 这强调了功能多样性在促进食物网稳定性方面的作用。

ABSTRACT: It remains challenging to understand why natural food webs are remarkably stable despite highly variable environmental factors and population densities. We investigated the dynamics in the structure and stability of Lake Constance's pelagic food web using 7 years of high- frequency observations of biomasses and production, leading to 59 seasonally resolved quantitative food web descriptions. We assessed the dynamics in asymptotic food web stability through maximum loop weight, which revealed underlying stability mechanisms. Maximum loop weight showed a recurrent seasonal pattern with a consistently high stability despite pronounced dynamics in biomasses, fluxes and productivity. This stability resulted from seasonal rewiring of the food web, driven by energetic constraints within loops and their embedding into food web structure. The stabilising restructuring emerged from counter- acting effects of metabolic activity and competitiveness/susceptibility to predation within a diverse grazer community on loop weight. This underscores the role of functional diversity in promoting food web stability.

Keywords: asymptotic stability | diversity and stability | energetic feasibility | food web structure | long- term data | mass- balanced network | maximum loop weight | pelagic food web | seasonal and interannual dynamics | trophic interaction loops

关键词：渐近稳定性|多样性和稳定性|能量可行性|食物网结构|长期数据|质量平衡网络|最大值环重|远洋食物网|季节和年际动态|营养相互作用环

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