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<p>Total hydrolyzable particulate amino acids (PAA) and total dissolved amino acids (TDAA) were analyzed to assess the bioavailability and diagenetic status of organic matter in the East Sea. Dissolved organic carbon concentrations were significantly higher in the deep layer (222 ± 84&#xa0;μM at ≥ 1000&#xa0;m) than that in the upper layer (89 ± 19&#xa0;μM at 0–100&#xa0;m; <i>p</i> &lt; 0.05), while carbon-normalized yields of TDAA were lower in the deep layer (<i>p</i> &lt; 0.05). The molar percentages of D-amino acids (D-AA (mol %)) and the D/L ratio of TDAA were elevated in the deep layer (<i>p</i> &lt; 0.05). These results indicate that early diagenesis and active microbial processes in the deep layer were potentially stimulated by the influx of organic matter from the benthic boundary layer or by physical processes such as eddy or lateral transport. Maximum values of D-AA (mol %) and the D/L ratio in both PAA and TDAA were observed at 1000&#xa0;m, indicating rapid incorporation and alteration of amino acids within the organic matter pool. Overall, this study highlights the potential of amino acid-based indices to trace microbial processing and diagenetic transformation of organic matter, offering novel insights into deep-sea biogeochemical cycling.</p>

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Amino Acid-Based Assessment of Bioavailability and Alteration of Organic Matter in the East Sea

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Boyeon Lee,
  • Jun-Oh Min,
  • Chorom Shim,
  • Sun-Yong Ha,
  • Bo Kyung Kim,
  • Jaeill Yoo,
  • Kyung-Hoon Shin

摘要

Total hydrolyzable particulate amino acids (PAA) and total dissolved amino acids (TDAA) were analyzed to assess the bioavailability and diagenetic status of organic matter in the East Sea. Dissolved organic carbon concentrations were significantly higher in the deep layer (222 ± 84 μM at ≥ 1000 m) than that in the upper layer (89 ± 19 μM at 0–100 m; p < 0.05), while carbon-normalized yields of TDAA were lower in the deep layer (p < 0.05). The molar percentages of D-amino acids (D-AA (mol %)) and the D/L ratio of TDAA were elevated in the deep layer (p < 0.05). These results indicate that early diagenesis and active microbial processes in the deep layer were potentially stimulated by the influx of organic matter from the benthic boundary layer or by physical processes such as eddy or lateral transport. Maximum values of D-AA (mol %) and the D/L ratio in both PAA and TDAA were observed at 1000 m, indicating rapid incorporation and alteration of amino acids within the organic matter pool. Overall, this study highlights the potential of amino acid-based indices to trace microbial processing and diagenetic transformation of organic matter, offering novel insights into deep-sea biogeochemical cycling.