米氏凯伦藻对蒙古裸腹溞的毒性及致毒途径分析

米氏凯伦藻(Karenia mikimotoi Hasen)是一种典型的鱼毒性赤潮藻,近年来在我国频繁爆发,给水产养殖业带了严重的经济损失.在实验室条件下,采用混合培养、隔离培养等手段研究了米氏凯伦藻及不同细胞组分对枝角类蒙古裸腹溞(Moina mongolica)摄食与生存的影响,分析了其致毒途径.结果表明,随着混合...

Toxicity Analysis of Karenia mikimotoi to Moina mongolica

Karenia mikimotoi Hasen is one of the HAB|causing organisms, which can result in the serve mortality of fishes and invertebrates, and harm to the cultivation and ecological system. To provide more information on the formation mechanism of K. mikimotoi causing HAB, in this study, effects of K. mikimotoion grazing and survival of Moina mongolica were studied using mixture and isolation feeding experiments in laboratory. The results show that the grazing rate of M. mongolica to P. subcordiformis decreased significantly with the increase of cell density of K. mikimotoi in mixture culture, suggesting that K. mikimotoi might inhibit the grazing of M. mongolica to P. subcordiformis. Survival rate of M. mongolica fed with K. mikimotoi was lower than that of the control (M. mongolica cultured in f/2 medium only), starved group (M. mongolica cultured with K. mikimotoi in the same beaker but separated by a filter) and isolated group (M. mongolica cultured with the mixed culture of K. mikimotoi and M. mongolica in the same beaker but separated by a filter). This indicates that toxicity of K. mikimotoi to M. mongolica might be from intracellular substances. However, various processes of cultures were non|toxic to M. mongolica and P. subcordiformis. The toxicity of K. mikimotoi on M. mongolica probably resulted from some unstable intracellular toxins or direct contacting with live alga cells.