中文摘要：

采用群体累积培养方法，研究了不同浓度（0．03、0．3、3、30和300μg·L^-1）的三氯杀螨醇和不同食物密度（3．0和5．0×10^6cells·ml^-1）的斜生栅藻（Scenedesmus obliquus）对萼花臂尾轮虫（Brachionus calyciflorus）种群增长影响。结果表明：藻类食物密度、三氯杀螨醇浓度以及二者的交互作用对轮虫种群增长率均有显著影响（P〈0．05）；藻类食物密度和三氯杀螨醇浓度对轮虫最大种群密度也有显著影响（P〈0．01），但二者的交互作用对其却无显著作用（P〉0．05）；与空白对照组相比，在3．0×10^6cells·ml^-1藻密度下，0．03～30μg·L^-1的三氯杀螨醇显著提高了轮虫种群增长率，3μg·L^-1的三氯杀螨醇显著降低了轮虫的最大种群密度，而300μg·L^-1的三氯杀螨醇则极显著提高了轮虫的最大种群密度；在5．0×10^6cells·ml^-1藻密度下，三氯杀螨醇对萼花臂尾轮虫种群增长率和最大种群密度均无显著影响；高密度的藻类食物降低了0．03～30μg·L^-1和300μg·L^-1的三氯杀螨醇分别对萼花臂尾轮虫种群增长率和最大种群密度所具有的促进作用，以及3μg·L^-1的三氯杀螨醇对轮虫最大种群密度所具有的抑制作用。

英文摘要：

By the method of population accumulative culture, this paper studied the etiects of dit： ferent concentration （0.03, 0.3, 3.0, 30 and 300 μg · L^-1 ） of dieofol and different algal food densities （3.0 and 5.0 × 10^6 cells · ml^-1 of Scenedesmus obliquus ） on the population growth of rotifer Brachionus calyciflorus. The results showed that dicofol concentration, algal food density, and their interaction had significant effects on the population growth rate of the rotifer （P 〈 0.05）. Both algal food density and dicofol concentration affected the maximal population density （P 〈0.01 ） significantly, but the reverse was found for their interaction （P 〉0.05）. Compared with the control, when the algal density was 3.0× 10^6 cells · ml^-1, the population growth rate of the rotifer had a significant increase at 0.03-30 μg · L^-1 of dicofol, and its maximal population density was decreased at 3μg · L^- 1 of dicofol but increased at 300 μg· L^-1 of dicofol significantly. However, when the algal density was 5.0 ×10^6 cells · ml ^-1 , dieofol had no significant effects both on the population growth rate and on the maximal population density of the rotifer. The results suggested that higher algal food densities mitigated the stimulating effects of dicofol at 0.03-30 μg· L^-1 and 300 μg· L^-1 on the population growth rate and maximal population density of B. calyciflorus, and the repressing effect of dicofol at 3 μg· L^-1 on the maximal population density of the rotifer.