不同暴露时间下Zn2+和Cd2+对萼花臂尾轮虫种群增长的毒性影响

摘要

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 in creased with the extension of the exposure time.%采用群体累积培养方法,考察不同亚致死浓度水平的Zn2+、Cd2+和Zn2+-Cd2+在不同暴露时间下对萼花臂尾轮虫3d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.Zn2+-Cd2+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.