title: Influence of blooms of phytoplankton on concentrations of hydrophobic organic chemicals in sediments and snails in a hyper-eutrophic, freshwater lake.
abstract: Blooms of phytoplankton, which are common in freshwater ecosystems, might not only affect quality of water but also influence biogeochemical processing of pollutants. Based on three years of field observations in sediments of Tai Lake, China, concentrations of organochlorine (OC) pesticides and polycyclic aromatic hydrocarbons (PAHs) in areas where blooms occurred were 2.4 and 3.4 times greater than concentrations in areas without blooms. Concentrations of octylphenol (OP), nonylphenol (NP) and bisphenol A (BPA) in areas where blooms did not occur were 3.8, 4.4 and 2.6 times greater than concentrations in areas where blooms did occur. To explain the differences, simultaneous, seasonally determinations of the water-sediment-phytoplankton-snails disequilibria were determined empirically. Greater sinking and lesser diffusion were shown to be probable drivers of the burial of δ-HCH, 4-ring and 5-ring PAHs in surface sediments of areas in which blooms occurred, being as much as 0.58, 38 and 45 g month-1. Large biodegradation and low burial was shown to be the probable reason of the inverse proportion of NP, OP and BPA in both water and sediment to biomass which might be due to the enhanced metabolic capacity of bacterial community associated with algae blooms. These phenomena further influence the persistent hydrophobic organic chemicals in the snail species (Bellamya quadrata) being greater in winter but lesser in summer, which is probably due to the positive relationship with the concentrations in sediment when snails were dormant and with the concentrations in water after dormancy. Thus, in Tai Lake, the fate and distribution of persistent and biodegradable contaminants in sediments and snails is influenced by blooms of phytoplankton, which should be included in models of environmental fates of contaminants.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Nanyang
authors.initials: N
authors.lastname: Yu
authors.affiliation: Key Laboratory of Environmental Protection of Lake Pollution Control, Chinese Research Academy of Environmental Science, Beijing, People's Republic of China.
authors.forename: Xia
authors.initials: X
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China; Ministry Environment Protection China, Nanjing Institute Environment Science, Nanjing, People's Republic of China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Han
authors.affiliation: Key Laboratory of Environmental Protection of Lake Pollution Control, Chinese Research Academy of Environmental Science, Beijing, People's Republic of China.
authors.forename: Shuhang
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China. Electronic address: zhangxw@nju.edu.cn.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China.
authors.forename: Si
authors.initials: S
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China; Department of Veterinary Biomedical Sciences, Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; Department of Zoology, Center for Integrative Toxicology, Michigan State University, East Lansing, MI, USA; School of Biological Sciences, University of Hong Kong, Hong Kong Special Administrative Region; Department of Biology and Chemistry, State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong Special Administrative Region.
authors.forename: John P
authors.initials: JP
authors.lastname: Giesy
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, People's Republic of China. Electronic address: yuhx@nju.edu.cn.
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yu
mesh_terms: D000818:Animals; D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D060106:Lakes / Q000737:chemistry*; D009930:Organic Chemicals; D010839:Phytoplankton; D012908:Snails; D014874:Water Pollutants, Chemical
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical
keywords: Biodegradable contaminants; Chemodynamics; Eutrophication; Pesticides; Polycyclic aromatic hydrocarbons; Sedimentation