Phytoplankton Community Structure Dynamics in Relation to Water Environmental Factors in Zhalong Wetland

Xiaoyu Li, Yuxi Zhao (), Fangying Chai, Hongxian Yu (), Xu Sun and Di Liu
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Xiaoyu Li: School of Fishery, Zhejiang Ocean University, Zhoushan 316022, China
Yuxi Zhao: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Fangying Chai: School of Management, Heilongjiang University of Science and Technology, Harbin 150020, China
Hongxian Yu: College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, China
Xu Sun: College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, China
Di Liu: Heilongjiang Provincial Water Conservancy and Hydroelectric Power Investigation Design and Research Institute, Harbin 150080, China

IJERPH, 2022, vol. 19, issue 22, 1-18

Abstract: Phytoplankton, as the primary producer of the wetland water ecosystem’s food chain, are very sensitive to environmental changes. In order to explore the significance of phytoplankton in protecting ecosystem integrity, the wetland ecosystem in Zhalong wetland, one of the most important international wetlands, was selected as the research area. For the study, 81 sampling sites were set up in the whole wetland, and phytoplankton samples and water quality environmental factors were measured in spring, summer, and autumn of 2019. The phytoplankton community structure and water environmental factors were evaluated by canonical correspondence analysis (CCA). The main research findings are as follows: a total of 292 species and variants of phytoplankton belonging to 8 phyla and 110 genera were identified within Zhalong wetland in spring, summer, and autumn 2019. The total phytoplankton abundance and biomass in summer were higher than in spring and autumn, and Cyclotella meneghiniana was the most dominant species in three seasons and three areas. The results of random forest are generally consistent with the results of CCA in spring, when the main environmental factors affecting phytoplankton were NTU and WT; the result in summer and autumn agreed with those of CCA, which awaits further study. In addition, the phytoplankton is mainly affected by WT, depth, and DO in the lake area, TP, DO, and NTU in the river area, and WT in the wetland area.

Keywords: phytoplankton; water environmental factors; Zhalong wetland; canonical correspondence analysis (CCA); random forest (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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