The effect of UV-B radiation enhancement on the growth competition between Alexandriun tamarense and Heterosigma akashiwo
UV-B辐射增强对亚历山大藻和赤潮异弯藻种群竞争的影响

The responses of the interspecific competition between Alexandrium tamarense and Heterosigma akashiwo to UV-Bradiation enhancement was studied by co-culture method. The results demonstrated that the different inoculative proportions of Alexandrium tamarense and Heterosigma akashiwo had apparent effects on interspecific competition between them. When the inoculative proportion of Alexandrium tamarense and Heterosigma akashiwo was A:H=1:4, Heterosigma akashiwo would be in predominance in the competition. However, Alexandrium tamarense would be in predominance when A:H=1:1 and A:H=4:1. The UV-Bradiation treatment could change the competition between Alexandrium tamarense and Heterosigma akashiwo, and it could promote the competitive dominance of Alexandrium tamarense. Therefore, the competitive dominance of Alexandrium tamarense changed more remarkable under UV-Bradiation treatment when A:H=1:1 and A:H=4:1.