期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 46, 期 6, 页码 3480-3488出版社
AMER CHEMICAL SOC
DOI: 10.1021/es2041288
关键词
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资金
- National Science Foundation of China (NSFC) [41171368]
- Chinese Academy of Sciences [2010T2Z37]
- National Science Foundation (NSF) [ENG/CBET-0826819, OCE-0825466]
- NSF East Asia and Pacific Summer Institute (EAPSI) [OISE-0913942]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0826819] Funding Source: National Science Foundation
Whole lake monitoring of hypertrophic Lake Taihu, China, was conducted during the summers of 2009-2010, with the intent of identifying environmental factors influencing Microcystis bloom formation and promoting the growth of toxigenic strains (mcyE possessing). Low N:P ratios (replete N & P) appeared to select for toxigenic populations of Microcystis spp., whereas nontoxic Microcystis spp. strains were dominant in more nutrient limited regions of the lake. Chlorophyll a (Adj. R-2 = 0.83, p < 0.0001) was equally predicative of microcystin variance across the lake as fluorescence based realtime quantitative PCR (qPCR) measurements of microcystin synthetase E (mcyE) gene equivalents (Adj. R-2 = 0.85, p < 0.0001). Interestingly, chlorophyll a was identified as a more robust and useful metric for predicting microcystin concentrations than qPCR measurements enumerating the total Microcystis population based on c-phycocyanin (alpha subunit; cpcA) gene equivalents (Adj. R-2 = 0.61, p < 0.0001). Overall, the lakewide composition of Microcystis spp. was highly variable over time and space, and on average the population consisted of 36 +/- 12% potentially toxic cells. On the basis of this study's findings, a framework for the design and implementation of a water safety plan for Taihu water quality managers and public health officials is proposed.
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