Water quality and habitat drive phytoplankton taxonomic and functional group patterns in the Yangtze River  

作　　者：Wenqi Gao Fangyuan Xiong Ying Lu Wei Xin Haihua Wang Gangpeng Feng Chiping Kong Lei Fang Xiaoping Gao Yushun Chen 

机构地区：[1]State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,Hubei,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Jiangxi Institute for Fisheries Sciences,Poyang Lake Fisheries Research Centre of Jiangxi Province,Nanchang 330039,Jiangxi,China [4]Jiujiang Institute of Agricultural Sciences,Jiujiang 332005,Jiangxi,China [5]East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China

出　　处：《Ecological Processes》2024年第1期144-158,共15页生态过程(英文)

基　　金：supported by National Key Research and Development Program of China(2023YFC3209002,2019YFD0901203);Chinese Academy of Sciences(ZDRW-ZS-2017-3-2);supported by the Innovative and Entrepreneurial Talents Project of Jiangxi Province(JXSQ2020102109)

摘　　要：Background Although phytoplankton are important primary producers in food webs,they are relatively less studied in large rivers compared to other types of systems.To fill this research gap,we studied phytoplankton taxonomic and functional composition and their relationships with water quality,habitat,climate,and land use across 30 river sections in the middle and lower reaches of the Yangtze River during 2017–2018.Results Major observed phytoplankton groups were cyanobacteria,bacillariophyta,and chlorophyta.Phytoplankton total abundance,total biomass,and species richness significantly decreased in the dry season compared to the wet season,with the species and functional composition differing significantly between seasons.Phytoplankton species differences between seasons were mainly contributed by Oscillatoria sp.,Pseudanabaena sp.,and Melosira granulata.The dfferences in phytoplankton functional groups between seasons were mainly contributed by P(including Closterium sp.,Melosira sp.),Lo(including Merismopedia sp.,Peridinium sp.,Ceratium sp.,and Gymnodinium sp.),and J(including Pediastrum sp.,Tetraedron sp.,Crucigenia sp.,Scenedesmus sp.,and Coelastrum sp.).The variance partitioning showed that water quality(NO_(3)-N,total suspended solids,turbidity)and habitat(water flow,river bank and river channel conditions)were critical factors in shaping phytoplankton patterns,followed by climate and land use.Conclusions Results indicated that there was significant seasonal variation of phytoplankton in the Yangtze River,with water quality and habitat primarily driving phytoplankton patterns.Our study contributes to the understanding of natural and anthropogenic factors that drive seasonal successional processes of phytoplankton in the Yangtze River.These findings have important implications for environmental management as well as towards the ecological restoration of large rivers.

关 键 词：Yangtze River PHYTOPLANKTON Functional group Water quality Physical habitat 

分 类 号：Q948.8[生物学—植物学]