塔玛亚历山大藻和赤潮异弯藻对黑褐新糠虾和卤虫的急性毒性作用

以黑褐新糠虾和卤虫为实验材料,研究了两种典型有毒有害赤潮藻,塔玛亚历山大藻和赤潮异弯藻的毒性.结果表明塔玛亚历山大藻和赤潮异弯藻都能影响糠虾的存活,在9 h内塔玛亚历山大藻和赤湖异弯藻对糠虾的半致死浓度分别约为7000和450 000个/cm3;在24 h内塔玛亚历山大藻和赤潮异弯藻对卤虫存活没有显著影响,而赤潮异弯藻能对卤虫的活力产生强烈的抑制作用,0.1,1.5,5和24 h的半抑制浓度分别为15 000,7500,4500,3000个/cm3,但在赤潮异弯藻较低浓度为3000个/cm3时,经过48 h卤虫的运动能力能够恢复到正常水平.结果表明,这两种有害藻对同一种生物的毒性大小存在差异,而这两种甲壳类生物对同一种有害藻的反应也不相同.

The toxicity study of Alexandrium tamarense and Heterosigma akashiwo to two crustacean species Neomysis awatschensis and Artemia salina

The toxicities of two typical HAB species Alexandrium tamarense and Heterosigma akashiwo were studied by two standard experimental organisms: Neomysis awatschensis and Artemia salina as test organisms. The results show that both A. tamarense and H. akashiwo affected the survival of N. awatschensis during 96 h exposure. The 96 h LC_(50) of A. tamarense and H. akashiwo on N. awatschensis are about 7 000 cells/cm~3 and 450 000 cells/cm~3, respectively. While A. tamarense and H. akashiwo do not show any impact on the survival of Artemia salina during 24 h exposure. However, H. akashiwo can inhibit the activity of the Artemia salina significantly. The 96 h EC_(50) at 0, 1, 1.5, 5 and 24 h are 15 000, 7 500, 4 500, 3 000 cells/cm~3, respectively. But at the low densities of 3 000 cells/cm~3, the activity of the Artemia salina can recover to the normal degree after 48 h. The results indicate the two HAB species have different toxicities to the same organism and the two crustaceans can have different responses to the same species.