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Dynamic processing of DOM: Insight from Exometabolomics, Fluorescence Spectroscopy, and Mass Spectrometry.

H J Smith1, M Tigges2, J D'Andrilli3

  • 1Center for Biofilm Engineering and Department of Chemistry, Bozeman, Montana 59717, USA.

Limnology and Oceanography Letters
|October 31, 2018
PubMed
Summary
This summary is machine-generated.

Glacially derived dissolved organic matter (DOM) is chemically labile but cannot sustain microbial respiration. Its impact on downstream ecosystems depends on DOM reactivity and heterogeneity over time.

Keywords:
FT-ICR MSbiological labilitycarbon cyclingdissolved organic matterexometabolomics

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Dissolved organic matter (DOM) in freshwater is a key carbon source for bacterial respiration.
  • Glaciers and ice sheets store vast amounts of organic carbon, with released DOM believed to stimulate downstream environments.
  • Glacial DOM is considered an important component of global carbon cycling.

Purpose of the Study:

  • To investigate the processing of glacially derived dissolved organic matter (DOM) by a single microbial species.
  • To determine if labile glacial DOM can support sustained bacterial respiration in freshwater environments.

Main Methods:

  • Utilized a single, environmentally relevant microbial organism.
  • Analyzed the processing of compositionally diverse DOM, including glacially derived sources.
  • Assessed the ability of glacial DOM to support sustained microbial respiration.

Main Results:

  • The studied organism processed diverse DOM compositions.
  • Glacially derived DOM, despite being chemically labile, did not support sustained respiration.
  • Microbial processing of DOM is complex and influenced by community interactions.

Conclusions:

  • Glacial DOM's contribution to downstream biogeochemical processes is not solely dependent on its release.
  • The reactivity and heterogeneity of liberated DOM, along with temporal factors, are critical.
  • Projected increases in glacial DOM export may have complex, context-dependent impacts on aquatic ecosystems.