Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1897/05-032R1.1 |
| Document | Shareable Link |
| Title (Primary) | Effects of the organophosphate paraoxon-methyl on survival and reproduction of Daphnia magna: importance of exposure duration and recovery |
| Author | Duquesne, S.; Reynaldi, S.; Liess, M. |
| Source Titel | Environmental Toxicology and Chemistry |
| Year | 2006 |
| Department | OEKOTOX |
| Volume | 25 |
| Issue | 5 |
| Page From | 1196 |
| Page To | 1199 |
| Language | englisch |
| Keywords | exposure duration; insecticide; sublethal effect; recovery |
| Abstract | The aim of this study was to determine the influence of exposure duration (1 h, 24 h, continuous) to paraoxon-methyl on the magnitude of lethal and sublethal effects, the shape of the concentration-response relationships and the recovery processes in Daphnia magna. Survival was more severely reduced in the continuous than in the pulse exposure regimes. The lethal concentrations (3d median lethal concentration [LC50] values) were 233, 2.33, and 1.14 mu g/L after 1-h, 24-h, and continuous exposure, respectively. The shapes of the concentration-response relationships for survival were significantly different after 1 h of exposure than after 24-h and continuous exposure. Indeed, the slopes of the curves defined by the ratios LC90/LC10 (ratio of 90 and 10% lethal concentrations) were 100, 1.74, and 1.97 for 1-h, 24-h, and continuous exposure, respectively. The large difference between 1 h and longer durations of exposure shows that the population is partially affected (10-90%) over a much broader range of concentrations when exposure is short. Negative effects on reproductive outputs occurred mostly at concentrations affecting partly the survival and therefore also over a broad range of concentrations after 1 h of exposure. However, these effects were only transient in the pulse exposure regimes as individual performances recovered. By contrast, reproductive outputs of survivors exposed continuously remained impaired. These results suggest that a refined risk assessment should consider exposure duration because it influences the magnitude of effects and recovery. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=2590 |
| Duquesne, S., Reynaldi, S., Liess, M. (2006): Effects of the organophosphate paraoxon-methyl on survival and reproduction of Daphnia magna: importance of exposure duration and recovery Environ. Toxicol. Chem. 25 (5), 1196 - 1199 10.1897/05-032R1.1 |
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