The results of ecological investigation of Microcystis blooms and their toxicity in a eutrophic park pond (where the annual average of total nitrogen and total phosphorus was 6.1 mg (.) L-1 and 1.79 mg (.) L-1, respectively) are presented. The blooms were mainly contributed by M. aeruginosa occurring in the period from May to October when water temperature ranged from 16 to 33 degreesC. Three remarkable growth peaks of Microcystis during the period were observed with chlorophyll a level of 0.73 mg (.) L-1, 1.44 mg (.) L-1, and 1.30 mg (.) L-1, respectively. The blooms were independent of phosp...
