Role of chemical and physical variables in regulating microcystin-LR concentration in phytoplankton of eutrophic lakes
Role of chemical and physical variables in regulating microcystin-LR concentration in phytoplankton of eutrophic lakes
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DOI：
10.1139/cjfas-57-8-1584
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发表时间：
2000-08-01
影响因子：
2.4
通讯作者：
Hrudey, SE
中科院分区：
文献类型：
--
作者：
Kotak, BG;Lam, AKY;Hrudey, SE
对艾伯塔省中部富营养化到富营养化的硬水湖进行了调查，以检验蓝藻毒素微囊藻毒素-LR(MC-LR)在浮游植物中的浓度受到环境因素的调节，环境因素既影响该毒素的主要生产者铜绿微囊藻的生物量，又影响该毒素在细胞中的浓度。在所考察的所有环境因素中，总磷与铜绿假单胞菌生物量和细胞MC-LR(以微克/克铜绿假单胞菌表示)之间的相关性最强。铜绿微囊藻的生物量与总氮磷比(TN：TP)和无机氮(NO2-+NO3-，NH4+)呈显著负相关。TN：TP的单变量回归模型解释了混合浮游植物群落中MC-LR浓度(以每升细胞毒素纳克表示)的最大差异。本研究表明，湖泊浮游植物MC-LR的动态变化与磷、氮的浓度和比例的变化有关。
A survey of eutrophic to hypereutrophic hardwater lakes in central Alberta was conducted to test the hypotheses that the concentration of the cyanobacterial toxin microcystin-LR (MC-LR) in phytoplankton is regulated by environmental factors that affect both the biomass of the main producer of the toxin, Microcystis aeruginosa, and the concentration of the toxin in the cells. Of all environmental factors examined, total phosphorus was the strongest correlate of both M. aeruginosa biomass and cellular MC-LR (expressed as micrograms per gram of M. aeruginosa). Microcystis aeruginosa biomass was also strongly negatively related to the total nitrogen to total phosphorus ratio (TN:TP) and inorganic nitrogen (NO2- + NO3-, NH4+). A univariate regression model of TN:TP explained the most variation in MC-LR concentration (expressed as nanograms of cellular toxin per litre) in mixed phytoplankton communities. This study indicated that MC-LR dynamics in phytoplankton of lakes was related to changes in the concentration and ratio of phosphorus and nitrogen.