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Impact of biochar on persistence and diffusion of antibiotic resistance genes in sediment from an aquaculture pond

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Abstract

Aquaculture sediments are a purported sizable pool of antibiotic resistance genes (ARGs). However, the pathways for transmission of ARGs from sediments to animals and humans remain unclear. We conducted an ARG survey in sediments from a bullfrog production facility located in Guangdong, China, and simulated zebrafish breeding systems were constructed, with or without biochar addition in sediments, to explore the effects of biochar on ARGs and their precursors of the sediment and zebrafish gut. After 60 days, 6 subtypes of ARGs and intI1 were detected, with sediments harboring more ARGs than zebrafish gut. The addition of biochar reduced the abundance of ARGs in the sediment and zebrafish gut, as well as suppressed the horizontal transmission of ARGs from sediment to zebrafish gut. Network analysis and partial least squares path modeling revealed that ARG enrichment was mainly affected by bacterial groups dominated by Nitrospirae, Gemmatimonades, Chloroflexi, and Cyanobacteria and intI1. Our findings provide insights into the transmission of ARGs from sediment to animals and highlight the efficacy of biochar amendments to aquaculture sediments to reduce the transmission of ARGs.

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Fig. 1

source water), S2 = bullfrog pond, and S3 = gutterway (wastewater discharge)

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Data availability

All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Acknowledgements

We thank zebrafish breeding center of Medical College of South China University of Technology for providing helpful suggestions.

Funding

This research was supported financially by the Ministry of Science and Technology of China for State Key Research and Development Project (2016YFC0400702), and the Overseas Outstanding Teacher Project from the Department of Science and Technology of Guangdong Province (No. 2020A1414010108).

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Authors and Affiliations

Authors

Contributions

Fengjie Hu: conceptualization, methodology, software, data curation, writing—original draft preparation. Randy Dahlgren: visualization, investigation. Taiping Zhang: writing—reviewing and editing. Jinni Liang: validation. Jiahui Xiao: validation. Zidan Liu: investigation, visualization.

Corresponding author

Correspondence to Taiping Zhang.

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Ethics approval and consent to participate

All experiments were performed according to the guidelines laid down by the Institutional Animal Care and Use Committee of South China University of Technology.

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Not applicable.

Conflict of interest

The authors declare no competing interests.

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Responsible Editor: Zhihong Xu

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Highlights

• Amendment of biochar decreases ARGs abundance in bullfrog breeding sediment and guts of zebrafishes.

• Biochar’s impacts on inhibiting ability for all ARGs weaken after excessive addition.

• IntI1 significantly affected the horizontal gene transfer of ARGs in sediment.

• Possible transfer mechanism and pathway of ARGs between sediment and animals were proposed.

Supplementary Information

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Supplementary file1 (DOC 10102 KB)

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Hu, F., Zhang, T., Liang, J. et al. Impact of biochar on persistence and diffusion of antibiotic resistance genes in sediment from an aquaculture pond. Environ Sci Pollut Res 29, 57918–57930 (2022). https://doi.org/10.1007/s11356-022-19700-2

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  • DOI: https://doi.org/10.1007/s11356-022-19700-2

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