Drivers of spatial and temporal variability in estuarine food webs
Drivers of spatial and temporal variability in estuarine food webs
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DOI：
10.3354/meps11389
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发表时间：
2015-08-06
影响因子：
2.5
通讯作者：
Garritt, Robert
中科院分区：
文献类型：
--
作者：
Nelson, James A.;Deegan, Linda;Garritt, Robert
理解生态系统对人为驱动因素的响应的一个关键挑战是描述食物网动态控制的时空变异性。我们使用了长期（9年）的同位素调查和社区公制同位素的方法来确定影响能源的河口食物网的主要物理因素。总体而言，整个河口的食物网结构相似，但存在一些空间差异。我们观察到更大的整体变化，初级生产源的食物网在河口上游（这是更多的淡水输入的影响）相比，中部和下部河口。一个优势种，mummichog底heteroclitus，营养水平也高度相关的潮汐高度，控制高沼泽访问中河口。我们还观察到了强烈的影响，淡水输入上河口的底栖-中上层耦合。我们的工作表明，在河口系统的食物网的时间和空间变异性是高度耦合的物理驱动程序。
A critical challenge to understanding the response of ecosystems to anthropogenic drivers is characterizing the spatial and temporal variability of controls on food web dynamics. We used a long-term (9 yr) isotope survey and a community metric isotope approach to determine the major physical factors influencing the source of energy to estuarine food webs. Overall, food web architecture was similar throughout the estuary, but there were some spatial differences. We observed greater overall variability in the primary production source to the food web in the upper estuary (which is more influenced by freshwater inputs) compared with the middle and lower estuary. The trophic level of one dominant species, mummichog Fundulus heteroclitus, was also highly correlated with tidal height, which controls high marsh access in the middle estuary. We also observed a strong influence of freshwater input on the benthic-pelagic coupling in the upper estuary. Our work demonstrates that the temporal and spatial variability of food webs in estuarine systems is highly coupled to physical drivers.