Abstract
Toxic cyanobacteria (TCB) are well-known worldwide for their adverse impacts on humans. Species compositions and seasonal variations of TCB in reservoirs depend on interactions between physical and chemical factors. This study was conducted to evaluate the water quality in the Aha Reservoir, Southwest China, focusing on cyanobacteria and cyanotoxins. Water samples were collected weekly or biweekly from May to September of 2015 and used to delineate temporal variations in density and distribution of toxic cyanobacteria and cyanotoxins in the reservoir. Toxic cyanobacteria identified consisted of Aphanizomenon flos-aquae, Pseudanabaena limnetica, Cylindrospermopsis sp., and Microcystis sp., with Aphanizomenon flos-aquae and Pseudanabaena limnetica being the most common and significant toxic genera. The total biomass of cyanobacteria was 17.0 mg/L. Identification and quantification of microcystin variants were conducted by high performance liquid chromatography (HPLC) using a system equipped with a photodiode array detector. Microcystin levels were between 0–3.0 μg/L, MC-RR was around 0–3.0 μg/L and MC-LR was approximately 0–0.9 μg/L. Overall, the results of this study indicate that the investigated reservoirs should be monitored regularly to minimize potential health risks to the human population.
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Supported by the Department of Science and Technology of Guizhou Province (Nos. [2015]2001, [2017]2863.... [2018]5805), the Education Department of Guizhou Province (No. KY[2017]032), and the Water Resources Department of Guizhou Province (No. KT201401)
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Han, M., Li, Q., Chen, H. et al. Spatial and temporal variations in cyanobacteria and microcystins in Aha Reservoir, Southwest China. J. Ocean. Limnol. 36, 1126–1131 (2018). https://doi.org/10.1007/s00343-018-7178-6
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DOI: https://doi.org/10.1007/s00343-018-7178-6