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通过对淀山湖、黄浦江水系浮游藻类的种群构成和蓝藻毒素的季节变化进行周年监测，发现淀山湖藻类及其毒素的污染具有明显的季节性，７～９月份蓝藻大量繁殖，形成了一年中污染的高峰。优势种群已由隐藻被毒性较高的蓝藻所取代，而蓝藻中占优势的铜绿微囊藻、水华鱼腥藻等能产生一种具有强烈肝毒性的短肽，称为微囊藻毒素。应用ＥＬＩＳＡ方法对淀山湖水中的微囊藻毒素进行测定，结果表明水体中微囊藻毒素与蓝藻的变化规律呈正相关，夏、秋季水中毒素出现高峰，最高值达５５．４ｎｇ／ｍｌ，说明淀山湖藻类毒素的污染较为严重。通过对水体总磷、总氮、叶绿素ａ、ｐＨ值等因素的分析，讨论了影响该水系营养水平和藻类生长的主要因素。
Through the annual monitoring of the population composition of the planktonic algae in Dianshan Lake and the Huangpu River and the seasonal changes of the cyanobacterial toxin, it was found that the pollution of algae and their toxins in Dianshan Lake was obviously seasonal. The cyanobacteria multiplied in July-September and formed a year Pollution in the peak. The predominant population has been replaced by Cyanobacteria which are highly toxic by Cyanobacteria, while Microcystis aeruginosa and Anhydrous Anabaena which are dominant in Cyanobacteria can produce a short peptide with strong hepatotoxicity called microcystin . The microcystin in Dianshan Lake water was determined by ELISA. The results showed that there was a positive correlation between the change of microcystins and cyanobacteria in water. The peak value of water toxins in summer and autumn peaked at 55.4 ng / ml, indicating that Dianshan Lake algae toxins pollution is more serious. Based on the analysis of total phosphorus, total nitrogen, chlorophyll a, pH and other factors, the main factors affecting the nutrient level and algae growth were discussed.