title: Dominant genera of cyanobacteria in Lake Taihu and their relationships with environmental factors.
abstract: Cyanobacterial blooms in freshwaters have become one of the most widespread of environmental problems and threaten water resources worldwide. Previous studies on cyanobacteria in Lake Taihu often collected samples from one site (like Meiliang Bay or Zhushan Bay) and focused on the variation in patterns or abundance of Microcystis during the blooming season. However, the distribution of cyanobacteria in Lake Taihu shows differing pattern in various seasons. In this study, water samples were collected monthly for one year at five sites in Lake Taihu with different trophic status and a physicochemical analysis and denaturing gradient gel electrophoresis (DGGE) were conducted. DGGE fingerprint analysis showed that Microcystis (7/35 bands) and Synechococcus (12/35 bands) were the two most dominant genera present during the study period at all five sites. Cyanobium (3/35 bands) was the third most common genus which has seldom been previously reported in Lake Taihu. Redundancy analysis (RDA) indicated that the cyanobacterial community structure was significantly correlated with NO3 (-)-N, CODMn, and NH4 (+)-N in the winter and spring, whereas it was correlated with water temperature in the summer and autumn. Limiting the nutrient input (especially of N and C loading) in Lake Taihu would be a key factor in controlling the growth of different genera of cyanobacteria.
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Feng
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Shiyou
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Wenxian
authors.initials: W
authors.lastname: Wu
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Jiawen
authors.initials: J
authors.lastname: Ma
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Pei
authors.initials: P
authors.lastname: Li
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Hailing
authors.initials: H
authors.lastname: Xu
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China. nli@ecust.edu.cn.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
authors.forename: Yaoyu
authors.initials: Y
authors.lastname: Feng
mesh_terms: D002681:China; D000458:Cyanobacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D058645:Denaturing Gradient Gel Electrophoresis; D017753:Ecosystem; D004784:Environmental Monitoring; D060106:Lakes / Q000737:chemistry / Q000382:microbiology*; D010802:Phylogeny; D012621:Seasons
keywords: Lake Taihu; Microcystis; Synechococcus; cyanobacterial bloom; cyanobacterial community structure