中文摘要：

对暴露于不同浓度的甲胺磷（0．01、0．1、1．0、10．0、100．0、1000．0和10000．0μg·L^-1）和17β-雌二醇（0．001、0．01、0．1、1．0、10．0、100．0、和1000．0μg·L^-1）溶液中的萼花臂尾轮虫的种群动态进行了研究．结果表明：甲胺磷和17β-雌二醇对轮虫种群动态的影响存在差异．甲胺磷和17β-雌二醇对实验期间轮虫的平均种群增长率均有显著影响，但对轮虫种群中的混交雌体受精率的平均值无显著影响；甲胺磷对实验期间轮虫种群中的携卵雌体数／非携卵雌体数和混交雌体百分率的平均值均有显著影响，而17β-雌二醇则无显著影响；甲胺磷对实验期间轮虫的休眠卵总产量无显著影响，而17β-雌二醇的影响较显著．与对照相比，10．0～10000．0μg·L^-1的甲胺磷和100．0μg·L^-1的17β-雌二醇均使轮虫的平均种群增长率显著提高；0．1～10000．0和10．0μg·L^-1的甲胺磷分别显著地降低了实验期间轮虫种群中的携卵雌体数／非携卵雌体数和混交雌体百分率的平均值；1000．0μg·L^-1的17β-雌二醇显著降低了轮虫的休眠卵总产量．在实验浓度范围内，轮虫平均种群增长率（Y，d^-1）与甲胺磷浓度（X，μg·L^-1）之间的关系为Y=-2×10^-8X^2＋0．0002X＋0．3474．种群增长率可用于监测和评价甲胺磷对轮虫种群动态的影响．

英文摘要：

The study on the dynamics of experimental population of freshwater rotifer Brachionus calyciflorus under exposure of different concentrations of methamidophos （0. 01, 0. 1, 1.0, 10.0, 100.0, 1 000.0 and 10 000.0 μg·L^-1） and 17β-estradiol （0.001, 0.01, 0.1, 1.0, 10.0, 100. 0 and 1 000. 0μg·L^-1） showed that both methamidophos and 17β-estradiol had significant effects on the mean growth rate of the population, but less affected the mean fertilization rate of mictic females. Methamidophos affected the mean ratio of ovigerous to non-ovigerous females and the mean mictic rate significantly but had less effect on the total resting egg production, while 17β-estradiol was in adverse. Compared with the controls, both 10. 0-10 000. 0μg·L^-1 of methamidophos and 100. 0 μg·L^-1of 17β-estradiol increased the mean population growth rate significantly. 0. 1-10 000. 0 and 10. 0μg·L^-1 of methamidophos decreased significantly the average ratio of ovigerous to non-ovigerous females and the average mictic rate, respectively, and 1000. 0 μg·L^-1 of 17β-estradiol decreased the total resting egg production significantly. Within the range of test concentrations of methamidophos, the relationship between the mean population growth rate （Y, d^-1） and the concentration （X, μg·L^-1） of methamidophos could be described as Y= -2 × 10^-8 X^2 ＋ 0. 0002X ＋ 0. 3474. The population growth rate could be used to assess the effects of methamidophos on the population dynamics of the rotifer.