The Effect of River Water Circulation on the Distribution and Functioning of Reservoir Microbial Communities as Determined by a Relative Distance Approach
The Effect of River Water Circulation on the Distribution and Functioning of Reservoir Microbial Communities as Determined by a Relative Distance Approach
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DOI：
10.1007/s10021-010-9388-4
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发表时间：
2010
期刊：
影响因子：
3.7
通讯作者：
K. Šimek;M. Comerma;Juan C. García;J. Nedoma;R. Marcé;J. Armengol
中科院分区：
文献类型：
--
作者：
K. Šimek;M. Comerma;Juan C. García;J. Nedoma;R. Marcé;J. Armengol
在富营养化的Sau水库（加泰罗尼亚，西班牙东北部）的河流水质，其流入速度，和温度对浮游食物网的组成和活动的影响进行了研究。我们分析了1996年7月和1999年4月之间进行的8个纵向断面，涵盖了广泛的季节和空间环流模式的变化。为了客观地比较季节性水位波动和不同类型的水循环模式下的生物纵向梯度，我们应用了一个模型的基础上，从河流流入的采样站的相对距离。即使在不同的水文情景下，该模型能够表征epilimnetic食物链演替和细菌，异养nanoflagellates，纤毛虫，浮游植物和浮游动物的峰值位置沿纵向梯度沿着。微生物峰的振幅与富营养化和富有机碳河水混入水库表层的比例直接相关。在春季和夏季，主要是在河水溢出事件时，大部分的河流直接混合到上层的微生物的丰度和活动增强检测。因此，相对输入的河水建议是一个有用的预测的振幅的发展的epilimnetic微生物食物网在高负荷的峡谷形水库。这些结果可能有重要的影响，在全球变化的背景下，在地中海地区，预计减少径流可能会深刻影响水库的河水循环模式，从而在这些生态系统中的有机碳循环。
The effect of river water quality, its inflow rate, and temperature on planktonic food web composition and activities were studied in the eutrophic Sau Reservoir (Catalonia, NE Spain). We analyzed 8 longitudinal transects conducted between July 1996 and April 1999 covering a wide range of variability in both seasonal and spatial circulation patterns. To compare objectively the biological longitudinal gradients under seasonally fluctuating water levels and different types of water circulation patterns, we applied a model based on the relative distance of a sampling station from the river inflow. Even under different hydrological scenarios, the model was able to characterize epilimnetic food chain successions and locations of peaks of bacteria, heterotrophic nanoflagellates, ciliates, phytoplankton, and zooplankton along the longitudinal gradient. The amplitude of microbial peaks was directly related to the proportion of nutrient and organic carbon rich river water that mixed into the reservoir epilimnion. Enhanced abundances and activities of microbes were detected in spring and summer periods, mainly during events of river water overflow when a large proportion of the river was directly mixed into the epilimnion. Thus, the relative input of river water is suggested to be a useful predictor of the amplitude of the development of the epilimnetic microbial food webs in highly loaded canyon-shaped reservoirs. These results may have important implications in the context of global change in Mediterranean regions, where expected reductions in runoff may profoundly affect river water circulation patterns in reservoirs and hence organic carbon cycling in these ecosystems.