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• W2891874646 abstract "Neonicotinoid insecticide mixtures are frequently detected in aquatic environments in agricultural regions. Recent laboratory studies have indicated that neonicotinoid mixtures can elicit greater-than-additive toxicity in sensitive aquatic insects (e.g. Chironomus dilutus). However, this has yet to be validated under field conditions. In this study, we compared the chronic (28- and 56-day) toxicity of three neonicotinoids (imidacloprid, clothianidin, and thiamethoxam) and their mixtures to natural aquatic insect communities. Using experimental in-situ enclosures (limnocorrals), we exposed wetland insects to single-compounds and binary mixtures at equitoxic concentrations (1 toxic unit under the principle of Concentration Addition). We assessed the composition of all emerged insect taxa and the cumulative Chironomidae emergence and biomass over time. In treated limnocorrals, there were subtle shifts in community composition, with greater mean proportions of emergent Trichoptera and Odonata. Cumulative emergence and biomass increased over time and there was a significant interaction between time and treatment. At 28 days, cumulative Chironomidae emergence and biomass were not significantly different between neonicotinoid treatments and controls. However, cumulative emergence in the imidacloprid, clothianidin, and clothianidin-thiamethoxam treatments were 42%, 20%, and 44% lower than predicted from applied doses. At 56 days, effects on cumulative emergence and biomass were significant for imidacloprid, clothianidin, and the clothianidin-thiamethoxam mixture. Contrary to laboratory predictions, mixtures were not more toxic than single compounds under semi-controlled field settings. Furthermore, only clothianidin significantly shifted sex-ratios towards female-dominated populations. Results showed that the responses of natural Chironomidae populations to neonicotinoids and their mixtures cannot be adequately predicted from laboratory-derived single-species models, and although occasional overdosing may have influenced the magnitude of effects, reductions in Chironomidae emergence and biomass can occur at average neonicotinoid concentrations below some current water quality guidelines. Therefore, neonicotinoid guidelines should be revised to ensure that Chironomidae and other sensitive aquatic insects inhabiting agricultural wetlands are adequately protected." @default.
• W2891874646 created "2018-09-27" @default.
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• W2891874646 date "2018-12-01" @default.
• W2891874646 modified "2023-10-18" @default.
• W2891874646 title "Neonicotinoid insecticide mixtures: Evaluation of laboratory-based toxicity predictions under semi-controlled field conditions" @default.
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• W2891874646 doi "https://doi.org/10.1016/j.envpol.2018.09.008" @default.
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