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Do bio-insecticides affect only insect species? Behavior, regeneration, and sexual reproduction of a non-target freshwater planarian

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Abstract

Bio-insecticides have been increasingly used worldwide as ecofriendly alternatives to pesticides, but data on their effects in non-target freshwater organisms is still scarce and limited to insects. The aim of this study was to determine the lethal and sub-lethal effects of the bio-insecticides Bac Control (based on Bacillus thuringiensis kurstaki—Btk) and Boveril (based on Beauveria bassiana—Bb) on regeneration, behavioral, and reproductive endpoints of the freshwater planarian Girardia tigrina. The estimated LC50–48h were > 800 mg a.i./L for Btk and 60.74 mg a.i./L for Bb. In addition, exposure to Btk significantly decreased locomotion and feeding activities of planarians (lowest observed effect concentration (LOEC) of 12.5 mg a.i./L Btk) and fecundity rate (LOEC = 3.12 mg a.i./L Btk), whereas exposure to Bb significantly delayed regeneration (LOEC = 0.75 mg a.i./L Bb) and decreased fecundity rate (1.5 mg a.i./L Bb) of planarians. Thus, both bio-insecticides induced deleterious sub-lethal effects on a non-insect freshwater invertebrate species. However, only Bb-based formulation affected the survival, fecundity rate, and regeneration at concentrations below the maximum predicted environmental concentration (PEC = 247 mg/L). Thus, care should be taken when using such formulations as alternatives to chemical insecticides near aquatic ecosystems.

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Acknowledgements

The authors thank the Instituto Federal de Educação, Ciência e Tecnologia Goiano–Campus Campos Belos, Brazil, for its support and partnership.

Data and materials availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Funding

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil (Edital 71/2013, Programa Ciência Sem Fronteiras, Modalidade Pesquisador Visitante Especial-PVE, Projeto: A058_2013). Thanks are due to FCT/MCTES for the financial support provided to CESAM (UIDP/50017/2020+UIDB/50017/2020), through national funds and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020. Renato A. Sarmento received a scholarship from Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq, Brazil (Produtividade em Pesquisa, Projeto: 306652/2018-8).

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LCRS conducted experiments, analyzed data, and wrote the manuscript (writing—original draft, review and editing). ASPD conducted experiments. ASS, ASPD, CG, JLTP, AMVMS, and RAS analyzed data and review and edit the manuscript; RAS and AMVMS conceived (funding acquisition) and designed research. All authors read, made corrections, and approved the manuscript.

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Correspondence to Renato Almeida Sarmento.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Silva, .C.R., Dornelas, A.S.P., de Souza Saraiva, A. et al. Do bio-insecticides affect only insect species? Behavior, regeneration, and sexual reproduction of a non-target freshwater planarian . Environ Sci Pollut Res 29, 10665–10674 (2022). https://doi.org/10.1007/s11356-021-16493-8

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  • DOI: https://doi.org/10.1007/s11356-021-16493-8

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