Antibiotic Resistance Genes in Chaohu Lake: Researchers Uncover Spatiotemporal Distributions and Relationships with Pesticides and Pharmaceuticals

Strategic Insights -

Researchers from Anhui Medical University have conducted a study on the spatiotemporal distributions of microorganisms and antibiotic resistance genes (ARGs) in Chaohu Lake, revealing significant correlations between microbiota and ARGs in lake water and intestinal contents, but weaker associations in sediments. The study identified 53 types of pesticides and 25 types of pharmaceuticals and personal care products (PPCPs) in the lake's water and sediments, with tebuconazole and amantadine showing the highest concentrations. The research highlights the impact of seasonal hydrological changes and non-antibiotic pollutants on the dissemination of ARGs, and the importance of considering these factors in the assessment of antibiotic resistance risks.

Key Takeaways:

  • The study explored the spatiotemporal distributions of microorganisms and ARGs in Chaohu Lake's surface water, sediments, and fish intestinal contents, revealing significant correlations between microbiota and ARGs in lake water and IC.
  • 53 types of pesticides and 25 types of PPCPs were identified in the river-lake system basin, with tebuconazole (1142.36 ng/L) and amantadine (851.41 ng/L) showing the highest concentrations.
  • Seasonal variations impacted lake water and IC more profoundly than sediments, with b-lactam and multidrug-resistant genes being widely found across the three environmental media.
  • Co-occurrence network analysis revealed that Proteobacteria were identified as a stable host, and non-antibiotic pollutants such as amantadine and terbuthylazine displayed significant positive correlations with ARGs.
  • The research concluded that seasonal hydrological changes and non-antibiotic pollutants play important roles in the dissemination of ARGs, prompting the need for further investigation into the assessment of antibiotic resistance risks.

Statistics:

  • 53 types of pesticides were identified in the river-lake system basin.
  • 25 types of PPCPs were identified in the river-lake system basin.
  • Tebuconazole (1142.36 ng/L) was the most concentrated pesticide detected in the lake's water.
  • Amantadine (851.41 ng/L) was the second-most concentrated pesticide detected in the lake's water.
  • B-lactam and multidrug-resistant genes were widespread in the three environmental media.
  • Non-antibiotic pollutants such as amantadine and terbuthylazine displayed significant positive correlations with ARGs.

Sources:

  • "Antibiotic resistance genes in multi-matrices of Chaohu Lake: Spatiotemporal variation and correlation with pesticides and PPCPs." Journal of Hazardous Materials, 2025;497:139604.
  • Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands.
  • NewsRx. Researchers at Anhui Medical University Release New Data on Chemicals and Chemistry (Antibiotic resistance genes in multi-matrices of Chaohu Lake: Spatiotemporal variation and correlation with pesticides and PPCPs). Chemicals & Chemistry. September 19, 2025; p 3991.