Cite this paper:
Libin HAN, Qiuhua LI, Wensheng CHEN, Xing WANG, Shihui ZHOU, Mengshu HAN, Anton BRANCELJ. The key environmental factors driving the succession of phytoplankton functional groups in Hongfeng Reservoir, southwest China[J]. Journal of Oceanology and Limnology, 2022, 40(4): 1472-1484

The key environmental factors driving the succession of phytoplankton functional groups in Hongfeng Reservoir, southwest China

Libin HAN1,2, Qiuhua LI1,2, Wensheng CHEN1, Xing WANG1,2, Shihui ZHOU1,2, Mengshu HAN2,3, Anton BRANCELJ2,4
1 Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001, China;
2 Guizhou International Science&Technology Cooperation Base-International Joint Research Centre for Aquatic Ecology, Guizhou Normal University, Guiyang 550001, China;
3 Key Laboratory for Information and Computing Science of Guizhou Province, Guizhou Normal University, Guiyang 550001, China;
4 National Institute of Biology, Vecna pot 111, Ljubljana 1000, Slovenia
Reservoirs are an important water source in many densely populated areas in southwest China. Phytoplankton play an essential role in maintaining the structure and function of reservoir ecosystems. Understanding the succession in phytoplankton communities and the factors driving it are essential for effective water quality management in drinking water reservoirs. In this study, water samples were collected monthly at the surface layers from March 2016 to December 2019 in Hongfeng Reservoir, southwest China. The relationship between functional group succession was analyzed based on nonmetric multidimensional scaling analysis (NMDS), redundancy analysis (RDA), succession rate, and other analysis methods. The results showed distinct shifts in the community structure of phytoplankton functional groups within study period. The Cyclotella sp. was dominant in 2016 and 2017, and Pseudanabaena limnetica was the dominant group in 2018 and 2019. It appears that the phytoplankton composition and biomass are closely related to the water temperature and nutrient status in this reservoir. The results clearly showed that the permanganate index (CODMn) was the key factor of dramatic phytoplankton functional group succession, and the change in succession rates was closely caused by total nitrogen concentration (TN). Therefore, the succession pattern and key factors of Hongfeng Reservoir revealed in this study were important guidance for the management of drinking water reservoirs in southwest China. A reasonable limit on exogenous nutrient input should be a priority, especially in high water temperature period.
Key words:    phytoplankton functional groups|driving factors|nonmetric multidimensional scaling|succession rates|Redundancy analysis   
Received: 2021-04-11   Revised:
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