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Objectives:Cyanobacterial blooms in freshwater lakes have become one of the most widespread environmental problems and threaten the quality,safety,ecological integrity and sustainability of water resources all over the world.There are dozens of genera of cyanobacteria that form blooms in waters,including toxic and nontoxic ones.Previous researches of cyanobacteria blooms in Lake Taihu often focus on the variation patterns or abundance of one genus (especially Microcystis which is one of the most dominant genera of cyanobacteria in Lake Taihu) at one sampling site (such as Meiliang Bay which is one of the most eutrophic bays in Lake Taihu) during one season (the bloom season).