Directional trends in species composition over time can lead to a widespread overemphasis of year‐to‐year asynchrony
Directional trends in species composition over time can lead to a widespread overemphasis of year‐to‐year asynchrony
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物种组成随时间变化的方向趋势可能导致普遍过分强调年份间的异步性
DOI：
10.1111/jvs.12916
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发表时间：
2020
影响因子：
2.8
通讯作者：
Estiarte, Marc
中科院分区：
文献类型：
--
作者：
Valencia, Enrique;de Bello, Francesco;Lepš, Jan;Galland, Thomas;E‐Vojtkó, Anna;Conti, Luisa;Danihelka, Jiří;Dengler, Jürgen;Eldridge, David J.;Estiarte, Marc
补偿动态被描述为增加群落稳定性的主要机制之一，例如，一些物种的逐年减少被其他物种的增加所抵消。因此，物种之间的完全同步（同步）的偏差被认为是生物多样性对稳定性影响的一个重要机制。然而，目前尚不清楚现有的同步性措施在多大程度上实际上捕捉到了物种丰度和组成存在长期方向性趋势（下文称为物种方向性趋势）的年度物种波动信号。这种方向性的趋势可能会导致误解的指数通常用于反映年到年synchrony.MethodsAn方法的基础上，三个长期的本地样方方差（T3），评估人口的变化，在一个为期三年的移动窗口，被用来克服物种的方向性趋势的影响。这种“去趋势”的方法被应用到全球范围内收集的77个时间植物群落数据集，包括近7,800个单独的地块采样至少六年的同步性的共同指数。包括情节保持不变的"控制"条件下，随着时间的推移，或进行不同的管理或干扰treatment.ResultsAccounting的方向趋势增加了检测的年到年的同步模式在所有同步指数考虑。具体来说，同步值在~40%的数据集中显著增加，而在~10%的数据集中同步性下降。对于38项研究的控制和操纵条件下，同步值的增加是更强的较长的时间序列，特别是以下实验manipulation.ConclusionsSpecies的长期方向性趋势可能会影响同步性和稳定性措施可能掩盖生态机制，造成每年的波动。因此，以前关于群落稳定性的研究可能过分强调了补偿动态在真实的世界生态系统中的作用，特别是在操纵条件下，而没有考虑长期方向性趋势可能的压倒性影响。
QuestionsCompensatory dynamics are described as one of the main mechanisms that increase community stability, e.g., where decreases of some species on a year‐to‐year basis are offset by an increase in others. Deviations from perfect synchrony between species (asynchrony) have therefore been advocated as an important mechanism underlying biodiversity effects on stability. However, it is unclear to what extent existing measures of synchrony actually capture the signal of year‐to‐year species fluctuations in the presence of long‐term directional trends in both species abundance and composition (species directional trends hereafter). Such directional trends may lead to a misinterpretation of indices commonly used to reflect year‐to‐year synchrony.MethodsAn approach based on three‐term local quadrat variance (T3) which assesses population variability in a three‐year moving window, was used to overcome species directional trend effects. This “detrending” approach was applied to common indices of synchrony across a worldwide collection of 77 temporal plant community datasets comprising almost 7,800 individual plots sampled for at least six years. Plots included were either maintained under constant “control” conditions over time or were subjected to different management or disturbance treatments.ResultsAccounting for directional trends increased the detection of year‐to‐year synchronous patterns in all synchrony indices considered. Specifically, synchrony values increased significantly in ~40% of the datasets with theT3 detrending approach while in ~10% synchrony decreased. For the 38 studies with both control and manipulated conditions, the increase in synchrony values was stronger for longer time series, particularly following experimental manipulation.ConclusionsSpecies’ long‐term directional trends can affect synchrony and stability measures potentially masking the ecological mechanism causing year‐to‐year fluctuations. As such, previous studies on community stability might have overemphasised the role of compensatory dynamics in real‐world ecosystems, and particularly in manipulative conditions, when not considering the possible overriding effects of long‐term directional trends.
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食草和干旱在稀树草原林下群落中产生短期随机性和长期稳定性。
DOI：
10.1002/eap.1649
发表时间：
2018
期刊：
Ecological applications : a publication of the Ecological Society of America
影响因子：
--
作者：
C. Riginos;Lauren M. Porensky;K. Veblen;T. Young
通讯作者：
T. Young
论坛：在不断变化的世界中维持生态系统功能：呼吁采取综合方法
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
H. Tomimatsu;Takehiro Sasaki;H. Kurokawa;J. Bridle;C. Fontaine;J. Kitano;Daniel B. Stouffer;M. Vellend;T. Bezemer;T. Fukami;E. Hadly;M. V. D. Heijden;M. Kawata;S. Kéfi;Nathan J B Kraft;K. McCann;P. Mumby;T. Nakashizuka;Owen L. Petchey;T. Romanuk;K. Suding;G. Takimoto;J. Urabe;S. Yachi
通讯作者：
S. Yachi
DOI：
--
发表时间：
1974
期刊：
影响因子：
--
作者：
T. Rabotnov
通讯作者：
T. Rabotnov
高海拔草原植物群落对草食动物排斥的长期反应
影响因子：
3.4
作者：
Iker Pardo;D. Doak;R. García;D. Gómez;María B. García
通讯作者：
María B. García
决定半干旱草原优势物种同步性的是环境响应，而不是物种相互作用
影响因子：
4.8
作者：
Tredennick, Andrew T.;de Mazancourt, Claire;Loreau, Michel;Adler, Peter B.
通讯作者：
Adler, Peter B.