不同暴露时间下Zn^(2+)和Cd^(2+)对萼花臂尾轮虫种群增长的毒性影响

The Toxicity of Zn^(2+) and Cd^(2+) to the Population Growth of Brachionus Calyciflorus under Different Exposure Time

采用群体累积培养方法,考察不同亚致死浓度水平的Zn^(2+)、Cd^(2+)和Zn^(2+)-Cd^(2+)在不同暴露时间下对萼花臂尾轮虫3 d种群增长率的影响。结果表明,随着暴露时间的延长,各处理组对轮虫种群增长的抑制作用在增加。Zn^(2+)-Cd^(2+)在中、低浓度处理组及短的暴露时间条件下表现为拮抗效应,而在高浓度处理组中表现为协同效应,且随着暴露时间的增加,协同作用效应在增加。

The toxic effects of Zn2+,Cd2+,and Zn2+Cd2+on the population growth rate of the freshwater rotifer Brachionus calyciflorus were evaluated under different exposure time using the 3 d population cumulative culture method.The results showed that the inhibition of population growth of the rotifers increased with the extension of the exposure time.The toxic effect of Zn2+Cd2+was antagonism under medium and low concentrations and shorter exposure time.However,the combined effect was synergistic under high concentrations,and increased with the extension of the exposure time.