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Feeding behavior of early life stages of the zebrafish Danio rerio is altered by exposure to glyphosate

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Abstract

Glyphosate levels and the transfer of glyphosate across trophic levels have rarely been studied in zooplankton. The food preferences of zebrafish during the first-feeding stage (which is critical for the survival of organisms), were analyzed because of the requirement for live food. Larval survival begins to be affected when glyphosate intake exceeds 0.3666 µg/larvae/day, in the case that only the food is contaminated; if the medium is also contaminated, the effects on survival start from 0.2456 µg/larvae/day. It was shown that glyphosate was more likely to be incorporated through the medium than through the food (zooplankton), which supports the results of previous studies that have ruled out the potential for biomagnification. The bioconcentration factor (BCF) of glyphosate was determined using an ELISA tests specific to measure glyphosate in the fish D. rerio, the rotifers Brachionus calyciflorus and Lecane papuana, and the cladoceran Ceriodaphnia dubia. The experimental design consisted in exposing seven zebrafish adults per replica (four replicates) in three treatments 1, 5, and 10 mg/L of glyphosate for 96 h to obtain bioconcentration factors in the gills, liver, and muscle. These concentrations were selected as potential glyphosate concentrations right after application as double highest reported concentration. Glyphosate levels in zooplankton can represent up to 6.26% of the total weight of rotifers (BFC = 60.35) and in zebrafish adult organs were less than 8 µg/mg of tissue (BCF values < 6). Although glyphosate does not biomagnify, our results suggest that glyphosate affected the dynamics between zooplankton and zebrafish larvae, diminishing survival and feeding rates, given that zooplankton species bioconcentrate glyphosate in large quantities. The BCF values found in this contribution are higher than expected. Glyphosate exposure affected energy metabolism and feeding behavior of zebrafish larvae, which presented high mortality rates at environmentally relevant concentrations.

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The database generated in the present study are available from corresponding authors on reasonable request.

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Acknowledgements

This contribution is part of the PhD thesis of GBAS that was supported by Consejo Nacional de Ciencia y Tecno1logía, CONACyT (No. 666012) and project (CB2016 288306). Authors thank the Sistema Nacional de Investigadores and Cátedras CONACYT for their support. We thank Andrea Lievana MacTavish for English language editing.

Funding

This work was supported by the Consejo Nacional de Ciencia y Tecnología CONACYT [grant numbers CB2016 288306 and doctoral scholarship 666012], and Institutional projects (UAA, PIT17-4, and PIT19-4).

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GBAS: conceptualization, investigation, writing-original draft, formal analysis, data curation, methology, writing—review and editing; MSB: conceptualization, writing—review and editing; MAAC: investigation, formal analysis, writing—review and editing; ALCH: investigation, methodology, writing—review and editing; BYR: conceptualization, funding acquisition, writing—review and editing, supervision; RRM: conceptualization, funding acquisition, writing—review and editing, supervision. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Beatriz Yáñez-Rivera or Roberto Rico-Martínez.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. In the case of Dario rerio methodology, the Bioethical Committee of the Universidad Autónoma de Aguascalientes approved these procedures.

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The authors declare no competing interests.

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Responsible Editor: Bruno Nunes

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Beatriz Yáñez-Rivera and Roberto Rico-Martínez are both PhD thesis co-directors of Gabriela Beatriz Alvarado-Suárez.

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Alvarado-Suárez, G.B., Silva-Briano, M., Arzate-Cárdenas, M.A. et al. Feeding behavior of early life stages of the zebrafish Danio rerio is altered by exposure to glyphosate. Environ Sci Pollut Res 29, 85172–85184 (2022). https://doi.org/10.1007/s11356-022-21790-x

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  • DOI: https://doi.org/10.1007/s11356-022-21790-x

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