Population Dynamics of Raphidiopsis raciborskii and Cylindrospermopsin Concentration in Ea Nhai Reservoir in Dak Lak Province, Vietnam
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Institute of Biotechnology, Hue University, Road 10, Phu Thuong, Phu Vang, Thua Thien Hue Province 49100, Vietnam
Institute of Biotechnology and Environment, Tay Nguyen University, 567 Le Duan Street, Buon Ma Thuot City, Dak Lak Province 63000, Vietnam
Department of Biology, University of Science, Hue University, 77 Nguyen Hue, Thua Thien Hue Province 49100, Vietnam
Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi Capital 10000, Vietnam
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi Capital 10000, Vietnam
Department of Environmental Sciences, Saigon University, 273 An Duong Vuong Street, District 5, Ho Chi Minh City 70000, Vietnam
Ha Manh Bui   

Environmental Sciences, Sai Gon University, 273 An Duong Vuong Street, 700000, Ho Chi Minh, Viet Nam
Submission date: 2021-10-19
Final revision date: 2022-01-25
Acceptance date: 2022-02-14
Online publication date: 2022-05-17
Publication date: 2022-07-12
Pol. J. Environ. Stud. 2022;31(4):3723–3734
Raphidiopsis raciborskii is a globally distributed bloom-forming cyanobacterium and produces toxin cylindrospermopsin (CYN), which results in public and environmental health consequences. piece of evidence To understand their blooming dynamics and to identify the environmental factors that determine their success in the tropical reservoir, a monthly monitoring program was conducted from May 2019 to April 2020. Variations in phytoplankton communities, environmental parameters (temperature, pH, dissolved oxygen, turbidity, dissolved inorganic nutrients) and CYN were simultaneously determined from a total of 36 samples in the Ea Nhai reservoir in Vietnam. The phytoplankton is composed of a dominant cyanobacteria community formed mainly by filamentous R. raciborskii with the biovolume of up to 66.8 mm3 L-1. PCA and Pearson correlation results showed the biovolume and variation of R. raciborskii in the Ea Nhai reservoir were mainly related to temperature and nutrients (N-NH4, P-PO4, TP, TN). Analysis of the toxins by ELISA demonstrated the presence of CYN in all water samples with an average value of 1.24 μg L-1 and it was significantly correlated with the biovolume of the invasive species R. raciborskii. The results of the HPLC analysis confirmed the production of CYN in nine isolated Raphidiopsis strains with concentrations ranging from 0.054 to 0.584 μg g-1DW. The relatively high biovolume of R. raciborskii that is associated with the level of CYN in the water and the capacity to produce CYN of the isolated R. raciborskii strains represent a potential threat to the public health and the life of domestic and wild animals in the reservoir catchment.