Behaviour moderates the impacts of food-web structure on species coexistence
Behaviour moderates the impacts of food-web structure on species coexistence
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DOI：
10.1111/ele.13643
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发表时间：
2020-11-18
期刊：
影响因子：
8.8
通讯作者：
Pawar, Samraat
中科院分区：
文献类型：
--
作者：
Ho, Hsi-Cheng;Tylianakis, Jason M.;Pawar, Samraat
食物网中的物种共存（数学“可行性”）如何从物种的营养相互作用中产生仍然是一个长期悬而未决的问题。在这里，我们研究结构（网络拓扑和体型结构）和行为（觅食策略和相互作用的空间维度）如何交互影响食物网的可行性。基于整体生物体消耗的食物网动态代谢约束模型表明，只要（1）存在许多顶级消费者，（2）放牧或静坐等待觅食策略很常见，以及（3）物种参与二维相互作用，在以大吃小觅食（消费者吃较小资源）为主的系统中，可行性就会得到提升。一致地，前两个条件与 74 个解析良好（主要是水生）的现实世界食物网中大吃小觅食的主导地位有关。我们的研究结果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。
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.