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Responses of Aquatic Nontarget Organisms in Experiments Simulating a Scenario of Contamination by Imidacloprid in a Freshwater Environment

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Abstract

Several studies have indicated the presence of the neonicotinoid insecticide imidacloprid (IMI) in aquatic ecosystems in concentrations up to 320.0 µg L−1. In the present study, we evaluated the effects of the highest IMI concentration detected in surface water (320.0 µg L−1) on the survival of Chironomus sancticaroli, Daphnia similis, and Danio rerio in three different scenarios of water contamination. The enzymatic activities of glutathione S-transferase (GST), catalase (CAT), and ascorbate peroxidase (APX) in D. rerio also were determined. For this evaluation, we have simulated a lotic environment using an indoor system of artificial channels developed for the present study. In this system, three scenarios of contamination by IMI (320.0 µg L−1) were reproduced: one using reconstituted water (RW) and the other two using water samples collected in unpolluted (UW) and polluted (DW) areas of a river. The results indicated that the tested concentration was not able to cause mortality in D. similis and D. rerio in any proposed treatment (RW, UW, and DW). However, C. sancticaroli showed 100% of mortality in the presence of IMI in the three proposed treatments, demonstrating its potential to impact the community of aquatic nontarget insects negatively. Low IMI concentrations did not offer risks to D. rerio survival. However, we observed alterations in GST, CAT, and APX activities in treatments that used IMI and water with no evidence of pollution (i.e., RW and UW). These last results demonstrated that fish are more susceptible to the effects of IMI in unpolluted environments.

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Availability of Data and Material

The raw data are stored in a data repository at the University of São Paulo and can be made available upon request to the author (lucasgoncalvesqueiroz@gmail.com).

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Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.

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Authors and Affiliations

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Contributions

LGQ conceived the presented idea, designed and performed ecotoxicological experiments, created and built the indoor system of artificial channels, analyzed the data, elaborated tables, and figures and wrote the article; CCAP performed the activity enzymatic experiments and helped in the analysis of these results; ECA, FAD, and EP performed the chromatographic analysis and helped in the analysis of these results; FTS responsible for Laboratory of Ecotoxicology; TCBP supervised the project.

Corresponding author

Correspondence to Lucas Gonçalves Queiroz.

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Conflict of interest

The opinions presented in the present study are those of the authors. There was no financial support that could have influenced its outcome, and there are no known conflicts of interest related to this publication. All named authors approved the manuscript and the order of authors listed.

Ethics Approval

Experimental procedures were previously approved by the Ethics Committee on Animals Use of the Biosciences Institute of the University of São Paulo (CEUA no. 310/2018).

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Queiroz, L.G., do Prado, C.C.A., de Almeida, É.C. et al. Responses of Aquatic Nontarget Organisms in Experiments Simulating a Scenario of Contamination by Imidacloprid in a Freshwater Environment. Arch Environ Contam Toxicol 80, 437–449 (2021). https://doi.org/10.1007/s00244-020-00782-3

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  • DOI: https://doi.org/10.1007/s00244-020-00782-3

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