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Poster De Conférence Année : 2018

Variability in the sensitivity of nematodes species towards imidacloprid and diuron

Variabilité de la sensibilité d'espèces de nématodes exposés à l'imidaclopride et au diuron

Résumé

To assess the lethal effects of diuron (herbicide) and imidacloprid (insecticide) on ubiquist organisms at the basis of food webs, we performed multispecies toxicity tests using nematode species commonly found in soil and freshwater benthic ecosystems. Diuron and imidacloprid belong to the top 15 of the most frequently detected pesticides in French rivers. Both chemicals show an elevated DT50 (time to 50% degradation) in sediments, about 130 days for imidacloprid and more than 30 days for diuron. A standardized toxicity test with Caenorhabditis elegans, a representative for the response of nematode species to toxic stress, showed no significant response to imidacloprid at high concentrations up to 119 mg L-1 regarding growth or reproduction. Diuron inhibited 82% of reproduction success of C. elegans, but showed no significant effect on growth at high concentration (33 mg L-1). Then, we compared the lethal effects of diuron and imidacloprid on eight species of free-living nematodes: Aphelenchoides sp, Caenorhabditis elegans, Pristionchus pacificus, Diploscapter coronatus, Rhabditoides sp, Plectus velox, Plectus opisthocirculus, Plectus acuminatus. Nematodes were exposed in water for 48h to two concentrations (35 and 350 mg L-1 for imidacloprid and 10 and 100 mg L-1 for diuron). Results indicated a low risk of these pesticides to nematodes, as the chemicals did not affect significantly the survivorship at their solubility limit in water for every tested species.

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Dates et versions

hal-02607687 , version 1 (16-05-2020)

Identifiants

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Julie Neury-Ormanni, C. Doose, N. Majdi, Jacky Vedrenne, Soizic Morin, et al.. Variability in the sensitivity of nematodes species towards imidacloprid and diuron. 28th SETAC Europe Annual Meeting, May 2018, Rome, Italy. pp.1, 2018. ⟨hal-02607687⟩
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