中文摘要：

研究了有机磷农药敌百虫对中肋骨条藻Skeletonema costatum生长的影响。相对于水生甲壳类和鱼类,敌百虫对中肋骨条藻毒性较低,72 h半抑制浓度（EC50）为84.8 mg/L。在31 d的亚慢性暴露下,低浓度组（≤10 mg/L）藻细胞生长趋势与对照组相似;50 mg/L的敌百虫在暴露初期对骨条藻的生长具有明显抑制作用,但在暴露15 d后,该浓度组藻细胞密度仍保持增长,最大细胞密度为2.77×107cells/mL,是对照组的137.7%。100 mg/L则能完全抑制藻细胞的生长。本实验结果说明敌百虫等有机磷农药的广泛使用可能会刺激浮游植物的生长,从而增加引发赤潮的风险。

英文摘要：

The effects of trichlorfon, an organophosphorus pesticide, on the growth of Skeletonema costatum were studied trader laboratory conditions. The 72 h ECs0 value of trichlorfon to S. costatum was 84.8 mg/L, which was far lower than that to aquatic crustaceans and fishes. The growth of S. costatum at the low concentration of trichlorfon （less than 10 mg/L） was similar to that in the control group during the 31 d chronic exposure. The growth was significantly inhibited by trichlorfon at the concentration of 50 mg/L for the first 14 d exposure; however the cell numbers kept on increasing after 15 d exposure when those in the other treatments declined. The maximum cell density in this group was up to 2.77×107 cells/mL, which was 137.7% of the control group. The growth at 100 mg/L was completely inhibited. The results suggested that the wide use of the organophosphorus pesticides such as trichlorfon would stimulate the growth of phytoplankton, and thus increase the rick of algal blooms.