The sediment-contact test using the ostracod Heterocypris incongruens: Effect of fine sediments and determination of toxicity thresholds - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Chemosphere Année : 2016

The sediment-contact test using the ostracod Heterocypris incongruens: Effect of fine sediments and determination of toxicity thresholds

Résumé

The toxicity test using freshwater ostracods of the species Heterocypris incongruens is a sub-chronic static test that exposes individuals to whole sediments over a period of 6 d, the endpoints being mortality and growth. We tested the hypothesis that endpoints of the sediment bioassay using Heterocypris incongruens are affected by the presence of fine sediment particles by testing control sediment supplied with the commercial test kit with increasing proportions of kaolin clay as a proxy for fines. While mortality was not affected, the results showed that increasing the presence of clay reduced ostracod growth. Based on the variability in growth, a sublethal toxicity threshold of 35% is proposed to distinguish effects due to sediment properties from those due to toxicity. The relevance of this threshold was verified using data from toxicity tests of ambient sediment samples with low levels of contamination.

Dates et versions

hal-01780462 , version 1 (27-04-2018)

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M Carmen Casado-Martinez, Karen Burga-Perez, Rebecca Bebon, Jean-François Ferard, Etienne Vermeirssen, et al.. The sediment-contact test using the ostracod Heterocypris incongruens: Effect of fine sediments and determination of toxicity thresholds. Chemosphere, 2016, 151, pp.220 - 224. ⟨10.1016/j.chemosphere.2016.01.126⟩. ⟨hal-01780462⟩
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