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<p>The occurrence of tetracyclines in the aquatic environment of a drainage with functions of irrigation and drainage poses potential threats to the coastal ecosystem. However, a lack of investigation and understand on the fate and transport of tetracyclines hampers the coastal management initiatives. We developed multimedia environmental models describing the fate and transport of tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC) from a downstream drainage to a coastal wetland where aquacultural areas provide shelter and food for marine organisms. Emission rates and contaminated areas were thus derived based on the field measurements of TC, OTC, and CTC. Tetracyclines were detected in the seawater samples collected from the oyster farms located approximately 1.6&#xa0;km offshore. Maximum concentrations of TC (439&#xa0;ng L<sup>−1</sup>), OTC (2310&#xa0;ng L<sup>−1</sup>), and CTC (393&#xa0;ng L<sup>−1</sup>) measured in drainage water were notably higher than those previously reported in rivers across Taiwan. In the sediment, tetracyclines concentrations were generally higher during summer than autumn, except for OTC levels estimated within drainage sediments. Our modeling results further indicated that approximately 49% of TC, 93% of OTC, and 25% of CTC present in drainage water were transported to coastal areas, where about 75% of TC, 48% of OTC, and 100% of CTC were subsequently accumulated in coastal wetland sediments. These findings provide valuable insights for managing antibiotic contaminants in coastal environment and highlight the need for greater attention to the ecological impacts of tetracyclines residues on organisms living in the environment.</p>

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Fate and Transport of Tetracyclines in a Coastal Ecosystem in Taiwan using a Field Data-Based Modeling Approach

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Tien-Hsuan Lu,
  • Yun-He Chen,
  • Yi-Lun Hung,
  • Yu-Shan Wang,
  • Pei-Yu Yang,
  • Jein-Wen Chen

摘要

The occurrence of tetracyclines in the aquatic environment of a drainage with functions of irrigation and drainage poses potential threats to the coastal ecosystem. However, a lack of investigation and understand on the fate and transport of tetracyclines hampers the coastal management initiatives. We developed multimedia environmental models describing the fate and transport of tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC) from a downstream drainage to a coastal wetland where aquacultural areas provide shelter and food for marine organisms. Emission rates and contaminated areas were thus derived based on the field measurements of TC, OTC, and CTC. Tetracyclines were detected in the seawater samples collected from the oyster farms located approximately 1.6 km offshore. Maximum concentrations of TC (439 ng L−1), OTC (2310 ng L−1), and CTC (393 ng L−1) measured in drainage water were notably higher than those previously reported in rivers across Taiwan. In the sediment, tetracyclines concentrations were generally higher during summer than autumn, except for OTC levels estimated within drainage sediments. Our modeling results further indicated that approximately 49% of TC, 93% of OTC, and 25% of CTC present in drainage water were transported to coastal areas, where about 75% of TC, 48% of OTC, and 100% of CTC were subsequently accumulated in coastal wetland sediments. These findings provide valuable insights for managing antibiotic contaminants in coastal environment and highlight the need for greater attention to the ecological impacts of tetracyclines residues on organisms living in the environment.