Department System Ecotoxicology, Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15, D-04318 Leipzig, Germany.
Ecotoxicol Environ Saf. 2010 Mar;73(3):353-9. doi: 10.1016/j.ecoenv.2009.11.008. Epub 2009 Dec 23.
The responses of various suborganismal and organismal endpoints of Daphnia magna to pulse exposure to sublethal levels of the organophosphate paraoxon-methyl were compared. The changes and recovery of biochemical, metabolic, and behavioural variables, as well as physiological responses, were observed. The cholinesterase (ChE), filtration, and swimming activities were all affected in a concentration-dependent manner, and these effects reached significance at concentrations of 1.0, 1.5, and 0.7 microg L(-1), respectively. The levels of these variables recovered significantly after detoxification for 24h in clean medium. ChE and swimming activities were affected significantly by lower concentrations of paraoxon-methyl than filtration activity, which had the same threshold as the physiological responses ((15)N abundance and body size). This study showed that among the parameters studied, swimming activity was the most sensitive, whereas changes in filtration activity had the most significant physiological consequences, and were therefore important in terms of effects propagation to the population level.
比较了大型溞对亚致死水平的有机磷对氧磷甲基脉冲暴露的各种亚机体和机体终点的反应。观察了生化、代谢和行为变量以及生理反应的变化和恢复。在浓度依赖性的方式中，所有的胆碱酯酶（ChE）、过滤和游泳活动都受到影响，并且这些影响在浓度为 1.0、1.5 和 0.7 µg L（-1）时达到显著水平。在清洁介质中解毒 24 小时后，这些变量的水平显著恢复。ChE 和游泳活动受到比过滤活性更低浓度的对氧磷甲基的影响更显著，过滤活性与生理反应（（15）N 丰度和体型）具有相同的阈值。这项研究表明，在所研究的参数中，游泳活动是最敏感的，而过滤活性的变化具有最显著的生理后果，因此对于种群水平的影响传播具有重要意义。
