钼对多刺裸腹溞的毒性

运用急性毒性和生命表实验方法,研究了钼对多刺裸腹溞(Moina macrocopa)的急性毒性和生命表统计学参数的影响。结果表明,钼对多刺裸腹溞的48hLC50值为134.46mg·L-1,95%置信区间为107.05～194.53mg·L-1;在2.0～15.0mg·L-1的浓度范围内,钼对多刺裸腹溞的生命期望、世代时间、平均寿命和净生殖率均无显著影响,但对种群内禀增长率有显著影响。空白对照组中,多刺裸腹溞的种群内禀增长率为0.0448±0.0033h-1,显著高于6.4、8.4、11.2和15.0mg·L-1钼浓度下多刺裸腹溞的种群内禀增长率(分别为0.0334±0.0007、0.0327±0.0010、0.0335±0.0003和0.0346±0.0005h-1)。与其他已测试的物种相比,多刺裸腹溞对钼具有较强的敏感性;在所研究的生命表统计学参数中,种群内禀增长率是最敏感的指标。

Toxicity of molybdenum to cladoceran Moina macrocopa

By means of acute toxicity and life-table experiments, this paper studied the acute toxicity of molybdenum (Mo) to Moina macrocopa and the effects of Mo on the life-table demographic parameters of M. macrocopa. The 48 h LC50 of M. macrocopa for Mo was 134.46 mg·L-1, with the 95% confidence interval of 107.05-194.53 mg·L-1. At concentrations of 2.0-15.0 mg·L-1, Mo had no significant effects on the life expectancy at birth, generation time, average life span, and net reproduction rate, but affected the intrinsic rate of M. macrocopa population increase significantly. In the control, the intrinsic rate of M. macrocopa population increase was 0.0448±0.0033 h-1, which was higher than that when the M. macrocopa was exposed to 6.4, 8.4, 11.2, and 15.0 mg·L-1 of Mo (0.0334±0.0007, 0.0327±0.0010, 0.0335±0.0003, and 0.0346±0.0005 h-1, respectively). Compared with other test organisms, M. macrocopa was more sensitive to Mo, and among all the life-table demographic parameters, the intrinsic rate of population increase was the most sensitive.