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| Content Provider | OECD iLibrary |
|---|---|
| Organization | OECD |
| Abstract | Cette Ligne directrice est conçue pour évaluer les effets d’une exposition prolongée à des produits chimiques sur des larves Chironomus sp., un diptère vivant dans les sédiments d’eau douce. Des chironomes au premier stade larvaire sont exposés à au moins cinq concentrations de la substance d'essai dans un système sédiment-eau. La substance d'essai est incorporée au sédiment et des larves au premier stade sont introduites dans des béchers où les concentrations d'eau et de sédiment ont été stabilisées. Le taux d'apparition et de développement des chironomes est mesuré à la fin de l'essai. La durée maximum d'exposition est de 28 jours pour C. riparius, C. yoshimatsui, et 65 jours pour C. tentans. L'essai limite correspond à un niveau de dose de 1000 mg/kg. La survie et le poids des larves peuvent également être mesurés, si nécessaire, après 10 jours (en ajoutant le nombre d'expériences identiques requis). Le rapport d'essai inclut la durée du développement et le nombre total de moucherons totalement émergés (le sexe et le nombre sont enregistrés quotidiennement), l'observation de tout comportement anormal, le nombre de pupes visibles n'ayant pas réussi à émerger et la présence de tout amas d'oeufs déposés. Les données sont analysées soit à l'aide d'un modèle de régression pour estimer la concentration qui entraînerait une réduction de x% de l'émergence, de la survie des larves ou de leur croissance, soit par la vérification d'une hypothèse statistique afin de déterminer une CSEO/CMEO. |
| Page Count | 21 |
| ISSN | 20745826 |
| e-ISBN | 9789264070271 |
| Language | French |
| Publisher | OECD Publishing |
| Publisher Date | 2004-11-23 |
| Access Restriction | Open |
| Subject Keyword | Environment |
| Content Type | Text |
| Resource Type | Book |
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