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Water 2017, 9(5), 326; doi:10.3390/w9050326

Effect of Fe and EDTA on Freshwater Cyanobacteria Bloom Formation

National Engineering Laboratory for Circular Economy, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
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Author to whom correspondence should be addressed.
Academic Editor: Yung-Tse Hung
Received: 19 February 2017 / Revised: 13 April 2017 / Accepted: 2 May 2017 / Published: 5 May 2017
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Abstract

Due to the fact that not all eutrophic lakes have cyanobacteria blooms, we hypothesized Fe may be another important limiting factor which regulates cyanobacteria bloom formation. We tested the hypothesis by batch cultures of bloom-forming Cyanobacterium, Microcystis aeruginosa with different ethylenediaminetetraacetic acid (EDTA)-Fe concentrations (0.5–6.0 mg/L), three levels of initial biomass, and excessive N and P (N = 4.2 mg/L, P = 0.186 mg/L) to simulate dynamically a cyanobacteria bloom in eutrophic conditions. The effect of EDTA and Fe uptake kinetics by M. aeruginosa were also examined. Results showed M. aeruginosa growth rate positively correlated with EDTA-Fe concentration and negatively correlated with biomass. Maximal biomass of M. aeruginosa was determined by Fe availability and initial biomass. EDTA could decrease both Fe availability and toxicity. Based on experimental results, a conceptual model of how Fe availability regulates cyanobacterial biomass in eutrophic lakes was developed. This study demonstrated bioavailable Fe is a potential limiting factor in eutrophic lakes that should be included in eutrophication management strategies. View Full-Text
Keywords: Microcystis; eutrophication control; freshwater; Fe availability Microcystis; eutrophication control; freshwater; Fe availability
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Zhang, T.; He, J.; Luo, X. Effect of Fe and EDTA on Freshwater Cyanobacteria Bloom Formation. Water 2017, 9, 326.

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