太湖微囊藻毒素年变化及其与浮游生物的关系

 应用酶联免疫吸附法,对太湖 6 个样点进行了为期 1 年的微囊藻毒素(MC)的监测,探讨了微囊藻毒素随时间变化的趋势及其与浮游生物的关系.结果表明,微囊藻毒素在湖体中的全年变化趋势和藻类生长繁殖的全年变化趋势有共同之处,均表现为夏、秋季高.但微囊藻毒素含量的峰值比藻类生物量的峰值略有滞后,并且在夏、秋季藻毒素含量总体水平较高的时期内,有明显的起伏;微囊藻毒素含量与蓝藻生物量呈高度相关,如果该样点藻类优势种为蓝藻,则微囊藻毒素含量与藻类总生物量亦相关;和浮游植物存在捕食关系的浮游动物(轮虫和原生动物)与藻毒素含量也存在相关性.

Periodical change of microcystin in Taihu Lake and its relationship with plankton

An enzyme-limited immunosorbent assay (ELISA) was used to monitor in one year the microcystin (MC) in six sampling cites in Taihu Lake. The tendency of the MC changed with time and relationship with the planktons were explored. In the lake water body the annual tendency of MC was same with that of algae growth, all displaying higher in summer and autumn; but the peak content of microcystin was lag a little to the peak of algae biomass. There was obvious fluctuations during the period of higher total content of microcystin in summer and autumn. The microcystin content was related significantly with Cyanobacteria biomass; and also with the total algae biomass, if the Cyanobacteria was the dominated species of the algae in the sampling site. The zooplankton such as rotifer and protozoan which prey upon phytoplankton also related to the content of microcystin.