摘要
The variations of environmental abundance and microcystin-LR （MC-LR） production ability of toxic Microcystis in the Nanquan region of Lake Taihu are investigated by real-time quantitative PCR （RTQ-PCR） and high performance liquid chromatography （HPLC） from May to December in 2009. Simultaneously, degrees of water pollution and eutrophication are monitored. The results indicate that the water quality in the Nanquan region of Lake Taihu is in a moderate degree of pollution and eutrophication. Algal density exceeds the threshold of bloom from May to November. The environmental abundance of toxic Microcystis is more than 40% from May to October and then significantly declines to 5.66% due to the obvious reduction in the water temperature in December. From May to December, the MC-LR production ability of toxic Microcystis ranges from 1.661 to 9.293 μg/108cells. With the significant drops in water temperature and algal density, the MC-LR production ability of toxic Microcystis is obviously increased from November to December. It is concluded that the lake presents Microcystis bloom and the toxic Microcystis becomes dominant during most of the year. The environmental abundance and the MC-LR production ability of toxic Microcystis have a close relationship with water temperature. The effective control of toxic Microcystis should be considered in both the bloom period and the non-bloom period of winter since the MC-LR production ability of toxic Microcystis obviously increases in winter.
采用实时荧光定量PCR和高效液相色谱技术对太湖南泉水域2009年5月至12月产毒微囊藻的环境丰度及其微囊藻毒素-LR产毒能力进行研究,并监测水质和富营养化程度.研究结果表明:南泉水域的水污染程度与富营养化程度均为中度;5月至11月蓝藻密度均超过水华的阈值;5月至10月产毒微囊藻的环境丰度均高于40%,随着温度的降低,产毒微囊藻的环境丰度迅速降低并在12月降到了5.66%;5月至12月产毒微囊藻的微囊藻毒素-LR产毒能力为1.661～9.293μg/亿细胞.11月至12月随着水温和藻密度的急速下降,产毒微囊藻的微囊藻毒素-LR产毒能力显著增强.结果提示太湖南泉水域全年大部分时间存在水华,产毒微囊藻为其优势藻,产毒微囊藻的环境丰度及其微囊藻毒素-LR产毒能力的动态变化和水温密切相关.冬季产毒微囊藻产毒能力的显著增强也提示在水华和非水华期内对其防制都应予以重视.
基金
The National Key Technologies R& D Program of Chinaduring the11th Five-Year Plan Period(No.2008ZX07101-011)
the National Natural Science Foundation of China(No.30972440)
the NaturalScience Foundation of Jiangsu Province(No.BK2008320)
the 333 Project Foundation of Jiangsu Province(No.07056)
