| Title |
Characteristics of Harmful Cyanobacteria Occurrence and Toxin Residual in Agricultural Reservoirs of Southern Gyeonggi |
| Authors |
김민주 ( Kim Minju ) ; 김영기 ( Kim Young-kee ) |
| DOI |
https://doi.org/10.15681/KSWE.2024.40.1.1 |
| Keywords |
Agricultural reservoirs; Anabaena; Cyanotoxin; Harmful cyanobacteria; Microcystis; Oscillatoria |
| Abstract |
Algal blooms occur seasonally in the eutrophicated rivers or reservoirs, and some harmful cyanobacteria species produce toxic substances, which are directly or indirectly harmful to the ecosystem and terrestrial animals. So, the monitoring and control of harmful cyanobacteria occurrence and toxins residual in the aquasystem are important to preserve the water environment and secure public health. In this study, the four harmful cyanobacteria occurrences and toxic substance concentrations of two agricultural reservoirs in the southern part of Gyeonggi Province were investigated from August to October 2022. Among four harmful cyanobacteria (Microcystis sp., Anabaena sp., Oscillatoria sp., Aphanizomenon sp.), three kinds of cyanobacteria except Oscillatoria sp. were observed, and Microcystis sp. was the dominant cyanobacteria except for Anabaena sp. dominant result of a sample collected on October at reservoir B. The cell density of cyanobacteria was influenced by season and weather due to the length of daytime and concentrations of organic carbon and nitrogen. Three kinds of microcystin and anatoxin-a were quantitatively analyzed as total (in the cell body and water) and extracellular (in water) concentrations. The maximum total concentrations of anatoxin-a, microcystin-LR, microcystin-RR, and microcystin-YR were 0.1291 μg/L, 0.2776 μg/L, 0.3721 μg/L, and 0.0306 μg/L, respectively, in reservoir A and 0.3274 μg/L, 0.1495 μg/L, 0.2037 μg/L, and 0.0153 μg/L, respectively, in reservoir B. |