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Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China

1
Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(3), 340; https://doi.org/10.3390/w13030340
Received: 23 November 2020 / Revised: 17 January 2021 / Accepted: 26 January 2021 / Published: 29 January 2021
(This article belongs to the Section Hydrology)
The resting stages of phytoplankton are usually regarded as the seed bank and source of harmful algal blooms because of the recruitment of phytoplankton from sediment to the water column under suitable environmental conditions. Information about resting stages of phytoplankton is abundant in shallow lakes and littoral sea; yet, studies on river–reservoir systems are rare. The river–reservoir continuum shows a unique structuring of longitudinal gradients of hydrological and hydrodynamic conditions. We hypothesized that the seed bank and algal blooms in reservoirs are influenced by the hydrodynamic conditions of each reservoir. We used Illumina Miseq sequencing to examine the spatio-temporal variation in the phytoplankton community in the sediment as reservoir drawdown and in surface water during algal blooms in Pengxi River, a tributary of China’s Three Gorges Reservoir. The results show that the cyanobacteria community in sediment is significantly influenced by temperature, total carbon, maximum flow velocity, and total phosphorous, the eukaryotic phytoplankton community in sediment is significantly influenced by total phosphorous, temperature, total carbon, maximum flow velocity, and total nitrogen. Additionally, the dominant species in sediment is significantly different from that in surface water during algal blooms. Our results suggest that the dominant species in surface water during algal blooms is more influenced by the environmental factors and hydrodynamic conditions in the water column than the seeds in the sediment. These findings are fundamental for further research on the influence of hydrodynamic conditions on algal blooms in artificially regulated river-reservoir systems. View Full-Text
Keywords: phytoplankton community; reservoir drawdown; algal blooms; seed bank; hydrodynamic condition; Three Gorges Reservoir phytoplankton community; reservoir drawdown; algal blooms; seed bank; hydrodynamic condition; Three Gorges Reservoir
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MDPI and ACS Style

Ouyang, W.; Li, Z.; Yang, J.; Lu, L.; Guo, J. Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China. Water 2021, 13, 340. https://doi.org/10.3390/w13030340

AMA Style

Ouyang W, Li Z, Yang J, Lu L, Guo J. Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China. Water. 2021; 13(3):340. https://doi.org/10.3390/w13030340

Chicago/Turabian Style

Ouyang, Wenjuan, Zhe Li, Jixiang Yang, Lunhui Lu, and Jinsong Guo. 2021. "Spatio-Temporal Variations in Phytoplankton Communities in Sediment and Surface Water as Reservoir Drawdown—A Case Study of Pengxi River in Three Gorges Reservoir, China" Water 13, no. 3: 340. https://doi.org/10.3390/w13030340

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