Species relationships in the extremes and their influence on community stability
Species relationships in the extremes and their influence on community stability
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DOI：
10.1098/rstb.2020.0343
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发表时间：
2021-10-11
影响因子：
6.3
通讯作者：
Reuman, Daniel C.
中科院分区：
文献类型：
--
作者：
Ghosh, Shyamolina;Cottingham, Kathryn L.;Reuman, Daniel C.
多个共存物种的种群波动之间的同步性对群落稳定性有重大影响，即对聚集特性（如群落总生物量）的相对时间恒定性有重大影响。然而，同步性及其影响通常使用协方差方法来测量，这并不说明物种丰度是否可能在物种相对常见时比在物种稀少时更相关，反之亦然。最近的研究表明，物种通常表现出这种“不对称的尾巴协会”。我们在这里考虑的影响，不对称的尾部协会对社区的稳定性。我们开发了一个“偏度比”，量化多少物种的关系和尾协会修改稳定性。偏度比补充了经典的方差比和相关度量。使用几十年的草原数据集，我们表明，占尾协会提供了新的观点，同步性和稳定性，例如物种协会可以改变社区稳定性差异社区崩溃或爆炸到高值，以前没有检测到的事实。物种关联可以缓解群落丰富度向高值的爆炸，增加稳定性的一个方面，同时加剧向低值的崩溃，降低稳定性的另一个方面;反之亦然。我们的工作开创了一个新的，更灵活的模式，探索物种关系和社区稳定性。这篇文章是“同步和节奏互动：从大脑到行为生态学”主题的一部分。
Synchrony among population fluctuations of multiple coexisting species has a major impact on community stability, i.e. on the relative temporal constancy of aggregate properties such as total community biomass. However, synchrony and its impacts are usually measured using covariance methods, which do not account for whether species abundances may be more correlated when species are relatively common than when they are scarce, or vice versa. Recent work showed that species commonly exhibit such 'asymmetric tail associations'. We here consider the influence of asymmetric tail associations on community stability. We develop a 'skewness ratio' which quantifies how much species relationships and tail associations modify stability. The skewness ratio complements the classic variance ratio and related metrics. Using multi-decadal grassland datasets, we show that accounting for tail associations gives new viewpoints on synchrony and stability; e.g. species associations can alter community stability differentially for community crashes or explosions to high values, a fact not previously detectable. Species associations can mitigate explosions of community abundance to high values, increasing one aspect of stability, while simultaneously exacerbating crashes to low values, decreasing another aspect of stability; or vice versa. Our work initiates a new, more flexible paradigm for exploring species relationships and community stability. This article is part of the theme issue 'Synchrony and rhythm interaction: from the brain to behavioural ecology'.