Modeling effects of diquat under realistic exposure patterns in genetically differentiated populations of the gastropod Lymnaea stagnalis

Abstract : Pesticide use leads to complex exposure and response patterns in non-target aquatic species, so that the analysis of data from standard toxicity tests may result in unrealistic risk forecasts. Developing models that are able to capture such complexity from toxicity test data is thus a crucial issue for pesticide risk assessment. In this study, freshwater snails from two genetically differentiated populations of Lymnaea stagnalis were exposed to repeated acute applications of environmentally realistic concentrations of the herbicide diquat, from the embryo to the adult stage. Hatching rate, embryonic development duration, juvenile mortality, feeding rate and age at first spawning were investigated during both exposure and recovery periods. Effects of diquat on mortality were analysed using a threshold hazard model accounting for time-varying herbicide concentrations. All endpoints were significantly impaired at diquat environmental concentrations in both populations. Snail evolutionary history had no significant impact on their sensitivity and responsiveness to diquat, whereas food acted as a modulating factor of toxicant-induced mortality. The time course of effects was adequately described by the model, which thus appears suitable to analyse long-term effects of complex exposure patterns based upon full life cycle experiment data. Obtained model outputs (e.g. no-effect concentrations) could be directly used for chemical risk assessment.
Document type :
Journal articles
Complete list of metadatas

https://hal-ineris.archives-ouvertes.fr/ineris-00963252
Contributor : Gestionnaire Civs <>
Submitted on : Friday, March 21, 2014 - 2:21:55 PM
Last modification on : Monday, March 26, 2018 - 4:44:01 PM

Links full text

Identifiers

Collections

Citation

Virginie Ducrot, Alexandre Pery, Laurent Lagadic. Modeling effects of diquat under realistic exposure patterns in genetically differentiated populations of the gastropod Lymnaea stagnalis. Philosophical Transactions of the Royal Society B: Biological Sciences, Royal Society, The, 2010, 365 (1557), pp.3485-3494. ⟨10.1098/rstb.2010.0047⟩. ⟨ineris-00963252⟩

Share

Metrics

Record views

182