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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
	Ouyang, Wenjuan1,2; Li, Zhe1; Yang, Jixiang1; Lu, Lunhui1; Guo, Jinsong3
	2021-02-01
摘要	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.
关键词	phytoplankton community reservoir drawdown algal blooms seed bank hydrodynamic condition Three Gorges Reservoir
DOI	10.3390/w13030340
发表期刊	WATER
卷号	13期号:3页码:15
通讯作者	Guo, Jinsong(jsguo_submit@163.com)
收录类别	SCI
WOS记录号	WOS:000615632900001
语种	英语