Behaviour moderates the impacts of food‐web structure on species coexistence,Ecology Letters

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Behaviour moderates the impacts of food‐web structure on species coexistence
Ecology Letters ( IF 7.6 ) Pub Date : 2020-11-18 , DOI: 10.1111/ele.13643
Hsi‐Cheng Ho ₁ , Jason M. Tylianakis ₂ , Samraat Pawar ₁

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How species coexistence (mathematical ‘feasibility’) in food webs emerges from species' trophic interactions remains a long‐standing open question. Here we investigate how structure (network topology and body‐size structure) and behaviour (foraging strategy and spatial dimensionality of interactions) interactively affect feasibility in food webs. Metabolically‐constrained modelling of food‐web dynamics based on whole‐organism consumption revealed that feasibility is promoted in systems dominated by large‐eat‐small foraging (consumers eating smaller resources) whenever (1) many top consumers are present, (2) grazing or sit‐and‐wait foraging strategies are common, and (3) species engage in two‐dimensional interactions. Congruently, the first two conditions were associated with dominance of large‐eat‐small foraging in 74 well‐resolved (primarily aquatic) real‐world food webs. Our findings provide a new, mechanistic understanding of how behavioural properties can modulate the effects of structural properties on species coexistence in food webs, and suggest that ‘being feasible’ constrains the spectra of behavioural and structural properties seen in natural food webs.

中文翻译：

行为减轻了食物网结构对物种共存的影响

食物网中的物种共存（数学上的“可行性”）如何从物种的营养相互作用中出现仍然是一个长期存在的未决问题。在这里，我们研究结构（网络拓扑结构和体型结构）和行为（互动的觅食策略和空间维度）如何交互影响食物网的可行性。基于全有机物消耗的食物网络动力学的代谢限制模型表明，只要（1）存在许多顶级消费者，（2）放牧，以大吃小觅食（消费者消耗较少资源）为主导的系统就会提高可行性。或静坐觅食的策略很常见，（3）物种参与二维相互作用。一致地，前两个条件与在74个分辨率良好（主要是水生）的现实世界食物网中以大吃小觅食为主。我们的发现为行为特性如何调节结构特性对食物网中物种共存的影响提供了一种新的，机械的理解，并表明“可行”限制了天然食物网中行为和结构特性的范围。

更新日期：2021-01-11

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