Susceptibility of Chordodes nobilii (Gordiida, Nematomorpha) to three pesticides: Influence of the water used for dilution on endpoints in an ecotoxicity bioassay

Environmental Pollution
Cecilia L AchiornoLucrecia Ferrari

Abstract

The increased use of pesticides during recent years necessitates a reevaluation of the effect of those compounds by extending the range of nontarget species commonly used in risk assessment. In the present work, we thus determined the impact of the pesticides glyphosate, carbendazim, and malathion on the parasite Chordodes nobilii in both natural and reconstituted freshwater as the assay medium and tested the sensitivity of three of this species's ecologically relevant parameters-e. g., embryo nonviablity and the infective capability of larvae exposed for 48 or 96 h either in ovo or after hatching via the infection index mean abundance-to compare those parameters to data from previous trials with reconstituted freshwater. In natural-freshwater assays, at environmentally relevant concentrations, all three pesticides inhibited the preparasitic-stage endpoints; with carbendazim being the most toxic pesticide and the subsequent infectivity of larvae exposed in ovo the most sensitive endpoint. In general, the 50%-inhibitory concentrations assayed in reconstituted freshwater were higher than those obtained in natural freshwater, indicating a certain protective effect; whereas the maximal toxicity of the three pesticides in both aqueo...Continue Reading

Citations

Aug 30, 2019·Environmental Science and Pollution Research International·Guangqiu LuHongbin Wang
Mar 4, 2020·Scientific Reports·Laetitia PoirierEric Chabrière

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