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

文献类型： 外文期刊

作者： Gao, Wenqi 1 ; Xiong, Fangyuan 1 ; Lu, Ying 1 ; Xin, Wei 1 ; Wang, Haihua 3 ; Feng, Gangpeng 3 ; Kong, Chiping 4 ; Fang, Lei 4 ; Gao, Xiaoping 4 ; Chen, Yushun 1 ;

作者机构： 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Jiangxi Inst Fisheries Sci, Poyang Lake Fisheries Res Ctr Jiangxi Prov, Nanchang 330039, Peoples R China

4.Jiujiang Inst Agr Sci, Jiujiang 332005, Jiangxi, Peoples R China

5.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

关键词： Yangtze River; Phytoplankton; Functional group; Water quality; Physical habitat

期刊名称：ECOLOGICAL PROCESSES （ 影响因子：4.8； 五年影响因子：4.6 ）

ISSN：

年卷期： 2024 年 13 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundAlthough 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.ResultsMajor 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 (NO3-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.ConclusionsResults 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.

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