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Induced development of oxytetracycline tolerance in bacterial communities from soil amended with well-aged cow manure

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Abstract

The use of animal manure as organic fertilizer is a common agricultural practice that can improve soil health and crop yield. However, antibiotics and their metabolites are often present in animal manure and, hence, in manure-amended soil. The aim of this study was to assess the induced development of oxytetracycline (OTC) tolerance in soil bacterial communities as a result of the addition of OTC to soil amended with well-aged cow manure. To this purpose, soil amended with well-aged cow manure was repeatedly – three times – spiked with different OTC concentrations (0, 2, 20, 60, 150, and 500 mg OTC kg−1 dry weight soil, each time) according to a pollution-induced community tolerance (PICT) assay. The PICT detection phase was conducted in Biolog EcoPlatesTM in the presence of the following OTC concentration gradient in the wells: 0, 5, 20, 40, 60, and 100 mg L−1. For all treatments, the application of OTC in the PICT selection phase resulted in lower values of bacterial metabolic activity (i.e., lower values of average well color development) in the PICT detection phase. A significant increase in OTC tolerance was observed in soil bacterial communities that had been exposed three times to ≥ 20 mg OTC kg−1 DW soil during the PICT selection phase. In general, higher levels of OTC exposure during the PICT selection phase resulted in bacterial tolerance to higher OTC concentrations during the PICT detection phase, pointing to a dose-dependent induced tolerance. It is important to (i) rationalize the amount of antibiotics administered to livestock, and (ii) treat properly the antibiotic-containing manure before its application to agricultural soil as fertilizer.

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Acknowledgements

The authors thank Dr. Itziar Alkorta, Coordinator of the Euskampus JRL - Environmental Antibiotic Resistance, for helpful discussions.

Author contributions

LJ: Formal analysis, Investigation, Writing-original draft. LE: Conceptualization, Writing: Review & Editing. MA: Formal analysis, Investigation. FB: Methodology. CG: Conceptualization, Writing: Review & Editing.

Funding

This work was financially supported by the Basque Government (URAGAN 18-00044 and KONTRAE-Elkartek-KK-2020-0000 projects) and the Spanish Ministry of Science and Innovation (PRADA PID2019-110055RB-C21 project). LJ was the recipient of a predoctoral fellowship from the Basque Government.

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Correspondence to Lur Epelde.

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The authors declare no competing interests.

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Jauregi, L., Epelde, L., Artamendi, M. et al. Induced development of oxytetracycline tolerance in bacterial communities from soil amended with well-aged cow manure. Ecotoxicology 32, 418–428 (2023). https://doi.org/10.1007/s10646-023-02650-x

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  • DOI: https://doi.org/10.1007/s10646-023-02650-x

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