Hepatotoxic Micocystins and Neurotoxic Anatoxin-a in Cyanobacterial Blooms form Korean Lakes

다국어 초록 (Multilingual Abstract)

Cyanovacterial bloom samples were collected in the warm season during 1992-1995 from the 12lakes in Korea. Six species each of Micorcystis and Anabaena, and two of Oscillatoria were identified in these lakes. The cyanotoxins 47 samples collected from the lakes were identified as microcystins-RR, -YR,-LR; desmethyl-7-microcystin-LR(7-DMLR), plus anatoxin-a. Microcystins were the main components of these cyanltlxins, while anatoxin-a was detcted in samples from a few lakes. Thirty-four of the 47 samples, included microcystins and the total amunts of microcystin ranged between 20-1500 ㎍/g freeze-dried bloom material .In four of the 26 samples, the samples contained anatoxin-a, though the amounts varied. The total microcystin concentration in 30 samtles from the lakes was equal to the cellular microcystin in these lakes because no extracellular microcystin was detected. All the lakes except for Lakes Younglang and Mijae are a source of drinkinf water. so the presence of cvanotoxin can be a potential threat and requires more attention to water treatment.