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Impact of repeated irrigation of lettuce cultures with municipal wastewater on soil bacterial community diversity and composition

  • ECOTOX, Aquatic and Terrestrial Ecotoxicology Considering the Soil: Water Continuum in the Anthropocene Context
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Abstract

The effect of wastewater irrigation on the diversity and composition of bacterial communities of soil mesocosms planted with lettuces was studied over an experiment made of five cultivation campaigns. A limited effect of irrigation with either raw or treated wastewater was observed in both α-diversity and β-diversity of soil bacterial communities. However, the irrigation with wastewater fortified with a complex mixture of fourteen relevant chemicals at 10 μg/L each, including pharmaceutical, biocide, and pesticide active substances, led to a drift in the composition of soil bacterial community. One hundred operational taxonomic units (OTUs) were identified as responsible for changes between treated and fortified wastewater irrigation treatments. Our findings indicate that under a realistic agronomical scenario, the irrigation of vegetables with domestic (treated or raw) wastewater has no effect on soil bacterial communities. Nevertheless, under the worst-case scenario tested here (i.e., wastewater fortified with a mixture of chemicals), non-resilient changes were observed suggesting that continuous/repeated irrigation with wastewater could lead to the accumulation of contaminants in soil and induce changes in bacterial communities with unknown functional consequences.

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Data Availability

All the nucleotidic sequences generated in this study have been deposited in the GenBank and are freely available.

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Acknowledgements

We thank Pr Damià Barceló for the coordination of the AWARE project and for scientific discussions.

Funding

This study was financially supported by the EU through the WaterJPI-2015 AWARE project (PCIN-2017-067). The Post-Doc of Dr Sara Gallego was funded by the AWARE project.

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Authors and Affiliations

Authors

Contributions

Contribution of each co-author is described below:

Sara Gallego: methodology, validation, formal analysis, investigation, data curation, writing original draft.

Monica Brienza: methodology.

Jérémie Béguet: methodology, data acquisition, and analysis.

Serge Chiron: conceptualization, investigation, writing—review and editing, supervision, project administration, funding acquisition.

Fabrice Martin-Laurent: conceptualization, investigation, writing—review and editing, supervision, project administration, funding acquisition.

Corresponding author

Correspondence to Fabrice Martin-Laurent.

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Ethical approval

This study did not involve human participants, human material, or human data so it does not need ethical approval document.

Consent to participate

All authors have agreed to participate to this study and were participants of the EU project AWARE funded by the Water JPI-2015 program.

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All authors have agreed to be coauthors of this manuscript.

Competing interests

The authors declare no competing interests.

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Responsible Editor: Diane Purchase

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Gallego, S., Brienza, M., Béguet, J. et al. Impact of repeated irrigation of lettuce cultures with municipal wastewater on soil bacterial community diversity and composition. Environ Sci Pollut Res 29, 29236–29243 (2022). https://doi.org/10.1007/s11356-021-14734-4

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  • DOI: https://doi.org/10.1007/s11356-021-14734-4

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