Alteration of dominant cyanobacteria in different bloom periods caused by abiotic factors and species interactions  

作　　者：Zhenyan Zhang Xiaoji Fan WJ.G.M.Peijnenburg Meng Zhang Liwei Sun Yujia Zhai Qi Yu Juan Wu Tao Lu Haifeng Qian 

机构地区：[1]College of Environment,Zhejiang University of Technology,Hangzhou 310032,China [2]College of Biotechnology and Bioengineering,Zhejiang University of Technology,Hangzhou 310032,China [3]Institute of Environmental Sciences(CML),Leiden University,2300 RA,Leiden,the Netherlands [4]National institute of Public Health and the Environment(RIVM),Center for Safety of Substances and Products,P.O.Box 1,Bilthoven,the Netherlands

出　　处：《Journal of Environmental Sciences》2021年第1期1-9,共9页环境科学学报（英文版）

基　　金：National Natural Science Foundation of China(Nos.21577128,21777144);the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT17R97)。

摘　　要：Freshwater cyanobacterial blooms have drawn public attention because they threaten the safety of water resources and human health worldwide.Heavy cyanobacterial blooms outbreak in Lake Taihu in summer annually and vanish in other months.To find out the factors impacting the cyanobacterial blooms,the present study measured the physicochemical parameters of water and investigated the composition of microbial community using the 16S rRNA gene and internal transcribed spacer amplicon sequencing in the months with or without bloom.The most interesting finding is that two major cyanobacteria,Planktothrix and Microcystis,dramatically alternated during a cyanobacterial bloom in 2016,which is less mentioned in previous studies.When the temperature of the water began increasing in July,Planktothrix appeared first and showed as a superior competitor for M.aeruginosa in NO3^−-rich conditions.Microcystis became the dominant genus when the water temperature increased further in August.Laboratory experiments confirmed the influence of temperature and the total dissolved nitrogen(TDN)form on the growth of Planktothrix and Microcystis in a co-culture system.Besides,species interactions between cyanobacteria and non-cyanobacterial microorganisms,especially the prokaryotes,also played a key role in the alteration of Planktothrix and Microcystis.The present study exhibited the alteration of two dominant cyanobacteria in the different bloom periods caused by the temperature,TDN forms as well as the species interactions.These results helped the better understanding of cyanobacterial blooms and the factors which contribute to them.

关 键 词：Cyanobacterial bloom Temperature Nitrogen condition Species interaction 

分 类 号：X52[环境科学与工程—环境工程] X17