Effects of Nicosulfuron and Tfluralin on the Population Dynamics of Three Ciliates
In order to explore the effects of nicosulfuron and trifluralin on the population growth of free living ciliates,Euplotes vannus,Uronema marinum and Pseudokeronopsis carnea were used as experimental animals to determine the changes of population intrinsic growth rate,generation time and population density under different drug concentrations.The results showed that 10.0 mg/L nicosulfuron and 10.0 mg/L trifluralin have the most obvious inhibitory effects on the population growth of E.vannus.When the concentration of nicosulfuron and trifluralin was 6.5 mg/L and 5.5 mg/L,respectively,the maximum population density of U.marinum was significantly lower than that of the control,and the maximum population density was(7.87±1.11)× 105 ind./L and(1.37±0.23)× 106 ind./L,respectively.The population growth was significantly inhibited,and the population intrinsic growth rate and generation time were significantly different(P＜0.01)from those of the control.With the increase of the concentration of nicosulfuron and trifluralin,the population intrinsic growth rate of P.carnea showed a downward trend and the generation time showed an upward trend.The results showed that among the three ciliates,the most obvious effect of nicosulfuron is found in U.marinum,and the most obvious effect of trifluralin is found in P.carnea.At high concentrations,two drugs significantly inhibited the population growth of three ciliates.
万方数据
维普
