Phytoplankton community assembly mechanisms and driving factors during wet seasons in Lake Poyang

It is of great significance to reveal the mechanism of phytoplankton community structure in aquatic ecosystem for effective prevention of harmful algal blooms and scientific management of aquatic ecosystem. In order to reveal the mechanism and its driving factors in Lake Poyang, one of the river-connected lakes in the middle and lower reaches of the Yangtze River, the phytoplankton and its functional groups and the environmental factors of 38 sampling sites were investigated in August 2020 in the lake. A total of 91 species in 59 genera from 7 phyla were detected, among which Chlorophyla (27 genera and 46 species), Bacillariophyta (13 genera and 22 species) and Cyanobacteria (8 genera and 11 species) accounted for 50.5%, 24.2% and 12.1%) of the total species, respectively. Phytoplankton can be divided into 23 functional groups, with N, G, P, Wl and L0 as the dominant ones, indicating that Lake Poyang was at the risk of eutrophication. The phytoplankton community structure varied significantly between in the bay and the main channel area of the lake, with higher values of Shannon-Wiener diversity index, Simpson diversity index and Pielou evenness index of phytoplankton in llie bay area (Mann-Whitney U test, P © 2024 by Journal of Lake Sciences.