title: Factors affecting temporal and spatial variations of microcystins in Gonghu Bay of Lake Taihu, with potential risk of microcystin contamination to human health.
abstract: A field survey of the seasonal variation of microcystin (MC) concentration was performed in Gonghu Bay (a total of 15 sampling sites) of Lake Taihu from January to December 2008. Microcystis spp. biomass and intra-/extracellular MCs were significantly correlated with water temperature, suggesting the importance of temperature in cyanobacterial blooming in the lake. Higher MC concentration was found in summer and autumn, and peaks of Microcystis biomass and intra-/extracellular MC concentrations were all present in October. Spatially, risk of MCs was higher in littoral zones than in the pelagic area. There were significant correlations between N or P concentrations, and Microcystis biomass or MC content, suggesting that N and P levels affected MC production through influencing Microcystis biomass. Intra-/extracellular MCs and Microcystis biomass had negative exponential relationships with TN:TP, and the maximum values all occurred when TN:TP was <25. Multivariate analyses by PCCA indicated that intra- and extracellular MC concentrations had better correlations with biological factors (such as Microcystis biomass and chl-a) than with physicochemical factors. The maximum MC concentration reached up to 17 micrograms/L MC-LReq, considerably higher than the drinking water safety standard (1 micrograms/L) recommended by the WHO. So it is necessary to take measures to reduce the exposure risk of cyanobacterial toxins to human beings.
authors.affiliation: Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, People’s Republic of China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Niu
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Zhimei
authors.initials: Z
authors.lastname: Ma
authors.forename: Min
authors.initials: M
authors.lastname: Tao
authors.forename: Min
authors.initials: M
authors.lastname: Qi
authors.forename: Laiyan
authors.initials: L
authors.lastname: Wu
authors.forename: Longgen
authors.initials: L
authors.lastname: Guo
mesh_terms: D018533:Biomass; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis*; D005843:Geography; D006801:Humans; D052998:Microcystins / Q000032:analysis* / Q000378:metabolism; D046931:Microcystis / Q000254:growth & development / Q000378:metabolism*; D011634:Public Health; D012044:Regression Analysis; D018570:Risk Assessment; D012307:Risk Factors; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism; D014877:Water Pollution, Chemical / Q000032:analysis
chemical_list: D052998:Microcystins; D014874:Water Pollutants, Chemical