Synchrony is more than its top-down and climatic parts: interacting Moran effects on phytoplankton in British seas
Synchrony is more than its top-down and climatic parts: interacting Moran effects on phytoplankton in British seas
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DOI：
10.1371/journal.pcbi.1006744
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发表时间：
2019-03
影响因子：
4.3
通讯作者：
Lawrence W. Sheppard;Emma J. Defriez;P. C. Reid;D. Reuman
中科院分区：
文献类型：
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作者：
Lawrence W. Sheppard;Emma J. Defriez;P. C. Reid;D. Reuman
大尺度空间同步性在生态学中是普遍存在的。我们研究了56年的数据，代表叶绿素密度在26个地区在英国海域监测的连续浮游生物记录仪调查。我们使用小波方法分解同步波动的时间尺度，并确定同步的驱动程序包括生物和非生物变量。我们通过与空间同步替代数据的比较，测试了这些驱动因素的统计显著性。确定同步的原因不同于并超越了确定当地人口动态的驱动因素。我们生成了时间尺度特定的模型，在叶绿素密度指数中占61%的长时间尺度（> 4年）同步，但只有3%的观察到的短时间尺度（<4年）同步。因此，同步性及其原因是特定于时间尺度的。长时间尺度叶绿素同步的主要来源是密切相关的海面温度，通过气候莫兰效应，虽然可能通过复杂的海洋学机制。自上而下的行动的哲水蚤finmarchicus捕食增强了这种环境同步机制，并与它的非加性相互作用，以产生更多的长期尺度的同步比自上而下和气候驱动程序将独立产生。因此，我们的主要结果是一个示范的莫兰驱动程序的同步，同步的新机制，可能会影响许多生态系统在大的空间尺度之间的相互作用。
Large-scale spatial synchrony is ubiquitous in ecology. We examined 56 years of data representing chlorophyll density in 26 areas in British seas monitored by the Continuous Plankton Recorder survey. We used wavelet methods to disaggregate synchronous fluctuations by timescale and determine that drivers of synchrony include both biotic and abiotic variables. We tested these drivers for statistical significance by comparison with spatially synchronous surrogate data. Identification of causes of synchrony is distinct from, and goes beyond, determining drivers of local population dynamics. We generated timescale-specific models, accounting for 61% of long-timescale (> 4yrs) synchrony in a chlorophyll density index, but only 3% of observed short-timescale (< 4yrs) synchrony. Thus synchrony and its causes are timescale-specific. The dominant source of long-timescale chlorophyll synchrony was closely related to sea surface temperature, through a climatic Moran effect, though likely via complex oceanographic mechanisms. The top-down action of Calanus finmarchicus predation enhances this environmental synchronising mechanism and interacts with it non-additively to produce more long-timescale synchrony than top-down and climatic drivers would produce independently. Our principal result is therefore a demonstration of interaction effects between Moran drivers of synchrony, a new mechanism for synchrony that may influence many ecosystems at large spatial scales.