Changes in microcystin content and environmental parameters over the course of a toxic cyanobacteria bloom in a hypertrophic regulated river, South Korea.
Cyanobacterial blooms and associated microcystins in hypertrophic stagnant West-Nakdong River were investigated at weekly intervals from April to August, 1999. Microcystis spp. accounted for over 85% of the numeric abundance of total phytoplankton. Microcystins were present in the blooms sampled between May and August. The peak of total microcystin (microcystin-LR + -RR) levels (maximum level; 612 microg g(-1)) was detected in the initial stage of the bloom (mid May), at the same time as high N/P ratio and high Microcystis biomass. This study indicated that total microcystins of this regulated river was positively correlated to Microcystis biomass, absolute nutrient concentration and TN/TP ratio.
Jung
Jong-Mun
JM
Pusan Water Quality Institute, Waterworks HQ, Busan, 617-042, South Korea. jmjung4356@empal.com
Lee
You-Jung
YJ
Park
Hong-Gi
HG
Jung
Eun-Young
EY
Jang
Min-Ho
MH
Ha
Kyong
K
Shin
Pan-Se
PS
Joo
Gea-Jae
GJ
D000458:Cyanobacteria / Q000737:chemistry / Q000254:growth & development*; D017753:Ecosystem; D007723:Korea; D052998:Microcystins; D010456:Peptides, Cyclic / Q000032:analysis*; D045483:Rivers; D014871:Water Microbiology
D052998:Microcystins; D010456:Peptides, Cyclic; C078588:microcystin