The bloom-forming cyanobacterium Microcystis aeruginosa Kütz 854 was cultured with 1.05 W·m-2 UV-B for 3 h every day, and its growth, pigments, and photosynthesis were investigated. The specific growth rates represented by chl a concentration and OD750 were inhibited 8% and 9% by UV-B exposure, respectively. Six days of UV-B treatment significantly reduced cellular contents of phycocyanin and allophycocyanin by 32% and 62%, respectively, and markedly increased the carotenoid content by 27%, but had little effect on the chl a content. The init...
