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- W4328132694 abstract "Dissolved organic matter (DOM) in the ocean is one of the largest carbon pools on Earth. Microbial metabolism is an important process that shapes the marine DOM pool. Current studies on the interactions between microorganisms and DOM focus mainly on oxic environments. Few studies have addressed the molecular characteristics of DOM in microbial-mediated transformation under anoxic/hypoxic conditions. As a result of deteriorating water quality due to eutrophication and global warming, anoxia occurs frequently in coastal waters. In this study, we performed an experiment to investigate changes in microbial community responses and the molecular characteristics of DOM in microbial-mediated transformation under hypoxic conditions. We compared microbial-mediated DOM transformation at different dissolved oxygen levels (7, 5, and 2 mg L −1) and in different media (natural and artificial seawater with and without laminarin). We also investigated differences in DOM composition between groups using spectroscopic analysis and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry. The results showed decreased microbial metabolic activity and delayed community succession at low oxygen (⩽2 mg L −1) in natural seawater supplemented with laminarin. The growth of strictly aerobic bacteria such as Pseudomonadaceae and Sphingomonadaceae was inhibited and the total organic carbon utilization rate was reduced by 36.9–6.7% from 4 to 32 days. Moreover, tyrosine-like and tryptophan-like components were preserved, while DOM humification and modified aromaticity index were significantly reduced under low oxygen conditions. This experiment provides justification for further study of the processes and mechanisms of improved labile DOM preservation in anoxic estuarine and coastal waters." @default.
- W4328132694 created "2023-03-22" @default.
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- W4328132694 date "2023-03-15" @default.
- W4328132694 modified "2023-09-29" @default.
- W4328132694 title "Molecular characterization of organic matter transformation mediated by microorganisms under anoxic/hypoxic conditions" @default.
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