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Microbial carbon monoxide consumption in salt marsh sediments.

Gary M King1

  • 1University of Maine, Walpole, ME 04573, USA. gking@maine.edu

FEMS Microbiology Ecology
|October 25, 2006
PubMed
Summary

Marine salt marsh sediments are active sites of carbon monoxide (CO) metabolism. Both microbial communities and plant roots contribute to CO cycling, influencing its production and consumption in estuarine environments.

Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Carbon monoxide (CO) metabolism in marine environments, particularly salt marshes, remains poorly understood.
  • Salt marshes are critical estuarine ecosystems influencing global biogeochemical cycles.

Purpose of the Study:

  • To investigate CO production and consumption pathways in a Maine fringing salt marsh.
  • To elucidate the roles of microbial communities and plant roots in estuarine CO cycling.

Main Methods:

  • Incubation of intact marsh cores and sediment slurries under oxic and anoxic conditions.
  • Kinetic analysis of CO uptake and inhibition studies with various substrates and inhibitors.
  • Aerobic oxidation experiments using sediment-free plant roots.

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Main Results:

  • Salt marsh sediments exhibit both CO production (enhanced by light) and consumption.
  • Aerobic CO consumption by surface sediments is mediated by non-ammonia/methane oxidizers and is substrate-dependent.
  • Anaerobic CO consumption is linked to sulfidogens and acetogens, not nitrate reducers or methanogens.
  • Plant roots, especially Spartina patens and Limonium carolinianum, actively oxidize CO.

Conclusions:

  • Marine salt marsh sediments are dynamic environments for CO metabolism.
  • Microbial consortia and plant roots play significant, distinct roles in estuarine CO cycling.
  • Understanding these processes is crucial for accurate estuarine carbon budget estimations.