Park, H. Shinshu University,

TOXIC CYANOBACTERIA BLOOMS AND MICROCYSTIN CONCENTRATION IN DRINKING WATER LAKE, LAKE BIWA, JAPAN Park, H.-D., Dept. of Environmental Sciences, Shinshu University, Matsumoto 390-0802, Japan,; Watanabe, M.F., Faculty of Geo-environmental Sciences, Risshou University, Kumagaya 360-0194, Japan; Nakajima, T., Lake Biwa Research Institute, Otsu 520-0806, Japan.
Temporal and spatial variability in the cyanobacteria blooms and concentration of toxic heptapeptide microcystin were studied during the warm season in a largest lake (Lake Biwa) in Japan. The lake water is supplied to fourteen millions residents as tap water in surrounding prefectures. Lake water samples (ca. 5 liters) were filtered to measure the quantity of microcystin in lake water. Total concentration of microcystin were measured with a high performance liquid chromatography. Five species of Microcystis were identified from cyanobacteria blooms and M. aeruginosa predominated during the warm season in this lake. The microcystins of the lake were detected as microcystins-RR, -YR and -LR. Microcystins-RR and -LR were the main components of cyanotoxin in the lake. The total microcystin concentration ranged from 0.04 to 5.8 ug per liter. Total microcystin content of cyanobacteria blooms ranged from 180 to 2337 ug per gram. Lake Biwa is a source of drinking water, so the presence of microcystin can be a potential threat and requires more attention to water treatment.
Day: Friday, Feb. 5
Time: 10:45 - 11:00am
Location: Eldorado Hotel
Code: SS42FR1045E