title: MIB-producing cyanobacteria (Planktothrix sp.) in a drinking water reservoir: distribution and odor producing potential.
abstract: The production of odorant 2-methylisoborneol (MIB) in water bodies by Planktothrix sp. have not been understood very well. Through a four-year investigation in Miyun Reservoir, a huge mesotrophic drinking water reservoir known to have the MIB episodes, we found that the Planktothrix sp. bloomed during September and October causing the high levels of MIB in the reservoir. The concentration of MIB and the biomass of MIB-producing cyanobacteria Planktothrix were measured (n = 887) at different sites and depths during different seasons. The results indicated that the shallow region of the reservoir is the major habitat for Planktothrix sp. due to that the light is able to penetrate down to the relatively high concentrations of nutrients close to the sediments. Quantile regression analysis between Planktothrix biomass and MIB concentration shows that the risk of MIB exceeding the odor threshold (15 ng L⁻¹) in water was as high as 90% when the Planktothrix density was more than 4.0 × 10⁵ cells L⁻¹, while the risk was reduced to 10% when the Planktothrix density remained below 1.6 × 10⁴ cells L⁻¹. This study will improve the understanding of the environmental behaviors of Planktothrix sp., and can provide useful information for better management of drinking water lakes/reservoirs experiencing the taste and odor (T&O) problems caused by deep living cyanobacterial species.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, China. ming.su@rcees.ac.cn
authors.forename: Ming
authors.initials: M
authors.lastname: Su
authors.forename: Jianwei
authors.initials: J
authors.lastname: Yu
authors.forename: Junzhi
authors.initials: J
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: An
authors.forename: Rolf D
authors.initials: RD
authors.lastname: Vogt
authors.forename: Tom
authors.initials: T
authors.lastname: Andersen
authors.forename: Dongmin
authors.initials: D
authors.lastname: Jia
authors.forename: Jingshi
authors.initials: J
authors.lastname: Wang
authors.forename: Min
authors.initials: M
authors.lastname: Yang
mesh_terms: D018533:Biomass; D001892:Camphanes / Q000032:analysis* / Q000378:metabolism; D002681:China; D000458:Cyanobacteria / Q000378:metabolism*; D060766:Drinking Water / Q000737:chemistry* / Q000382:microbiology; D017753:Ecosystem; D009812:Odorants; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism; D014881:Water Supply
chemical_list: D001892:Camphanes; D060766:Drinking Water; D014874:Water Pollutants, Chemical; C005536:2-methylisoborneol