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Published in: Environmental Earth Sciences 5/2014

01-03-2014 | Original Article

The occurrence of cyanobacteria and microcystins in the Hoan Kiem Lake and the Nui Coc reservoir (North Vietnam)

Authors: Thi Thuy Duong, Sabine Jähnichen, Thi Phuong Quynh Le, Cuong Tu Ho, Trung Kien Hoang, Trung Kien Nguyen, Thi Nguyet Vu, Dinh Kim Dang

Published in: Environmental Earth Sciences | Issue 5/2014

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Abstract

The occurrence of increasing blooms of toxic cyanobacteria in freshwaters has received much attention due to the ability of many cyanobacteria to produce potent cyanotoxins. In this paper, the occurrence of dominant cyanobacteria and the concentration of microcystins (MCs) analysis were investigated monthly from July 2008 to April 2009 in the Hoan Kiem Lake and from February to April 2009 in the Nui Coc reservoir. Concentrations of intracellular MCs from water, bloom samples, and isolated strains were quantified by using high performance liquid chromatography (HPLC). During the study period, the microscopic examination of the phytoplankton samples showed the dominance of the genus Microcystis in the water environment of the Hoan Kiem Lake and the Nui Coc reservoir. The toxin analysis by HPLC demonstrated the presence of two MC variants: MC-LR and MC-RR in water samples. Total concentrations of the toxins in filtered samples from surface water ranged from non-detected to 0.91 μg L−1 at Nui Coc reservoir and they ranged from 2.1 to 46.0 μg L−1 at Hoan Kiem Lake. The results of the HPLC analysis confirmed the production of MCs in bloom samples (ranged from 115.9 to 184.6 μg L−1 in the Hoan Kiem Lake and from 726.5 to 1116 μg L−1 in the Nui Coc reservoir) and isolated strains of Anabaena sp. and Microcystis with the concentration of MC ranging from 152 to 396.2 μg g−1 dry mass, respectively.

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Metadata
Title
The occurrence of cyanobacteria and microcystins in the Hoan Kiem Lake and the Nui Coc reservoir (North Vietnam)
Authors
Thi Thuy Duong
Sabine Jähnichen
Thi Phuong Quynh Le
Cuong Tu Ho
Trung Kien Hoang
Trung Kien Nguyen
Thi Nguyet Vu
Dinh Kim Dang
Publication date
01-03-2014
Publisher
Springer Berlin Heidelberg
Published in
Environmental Earth Sciences / Issue 5/2014
Print ISSN: 1866-6280
Electronic ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-013-2642-2

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