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

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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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Acknowledgments

The authors are grateful for the financial supports from the NAFOSTED 106.16-2010.71 (the Vietnam’s National Foundation for Science and Technology Development (NAFOSTED). The authors would like to thank the DAAD (German Academic Exchange Service) and the colleagues from the Institute of Hydrobiology and the Ecological Research Station Neunzehnhain, TU Dresden, Germany for their helps and collaborations. We thank Mr Joost Hegger for improvements to the native style of the manuscript. We gratefully acknowledge the anonymous reviewers whose comments and suggestions significantly improved the manuscript.

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Authors and Affiliations

  1. Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam

    Thi Thuy Duong, Cuong Tu Ho, Trung Kien Hoang, Trung Kien Nguyen, Thi Nguyet Vu & Dinh Kim Dang

  2. Dresden University of Technology, Institute of Hydrobiology, 01062, Dresden, Germany

    Sabine Jähnichen

  3. Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam

    Thi Phuong Quynh Le

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  1. Thi Thuy Duong
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  2. Sabine Jähnichen
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Duong, T.T., Jähnichen, S., Le, T.P.Q. et al. The occurrence of cyanobacteria and microcystins in the Hoan Kiem Lake and the Nui Coc reservoir (North Vietnam). Environ Earth Sci 71, 2419–2427 (2014). https://doi.org/10.1007/s12665-013-2642-2

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