Effects of UV-B radiation on the feeding of the rotifer Brachionus urceus

The feeding of the rotifer Brachionus urceus for six strains of marine microalgae(Chlorella sp., Pavlova uiridis, Tetraselmis chuii, Isochrysis galbana Park 8701, Chaetoceros muelleri Lermumerman and Nitzschia clostertum) under the treatment of UV-B radiation was studied. The results show that the feeding of the rotifer B. urceus is inhibited significantly by UV-B radiation treatment(P0.05). Compared with control, the filtering rate and feeding rate of the rotifer B. urceus are significantly lower(P0.05)with increasing dose of UV-B radiation. In addition, the filtering rate and feeding rate of the rotifer B. urceus vary with the studied marine microalgae. This result indicates that the rotifer B. urceus feeding is selective on the six strains of marine microalgae.