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Microbial nitrogen cycling processes in oxygen minimum zones.

Phyllis Lam1, Marcel M M Kuypers

  • 1Nutrient Group, Max Planck Institute for Marine Microbiology, D-28359 Bremen, Germany. plam@mpi-bremen.de

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Oxygen minimum zones (OMZs) drive significant nitrogen loss through microbial processes like anammox and denitrification. Understanding these complex nitrogen cycles is crucial for predicting oceanic responses to global change.

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Area of Science:

  • Marine microbial ecology
  • Biogeochemical cycles
  • Oceanography

Background:

  • Oxygen minimum zones (OMZs) are critical oceanic regions characterized by low oxygen levels.
  • These zones host unique microbial communities with specialized respiratory metabolisms.
  • OMZs play a significant role in global nitrogen cycling and nutrient budgets.

Purpose of the Study:

  • To elucidate the interconnected nitrogen (N) cycle processes within OMZs.
  • To understand the microbial drivers of N-loss and remineralization in OMZs.
  • To highlight challenges in measuring microbial functions and predicting OMZ responses to environmental change.

Main Methods:

  • Review and synthesis of existing research on OMZ biogeochemistry.
  • Analysis of microbial metabolic pathways involved in nitrogen cycling.
  • Discussion of ecophysiological and biogeochemical measurement challenges.

Main Results:

  • OMZs facilitate a nearly complete nitrogen cycle with substantial N-loss via anammox and denitrification.
  • Key remineralization pathways include nitrate reduction to nitrite and dissimilatory nitrate reduction to ammonium.
  • Nitrification also occurs, converting ammonium to N-oxides, linking organic N to N-loss.
  • Microbial communities exhibit versatile metabolic potentials, complicating activity assessments.

Conclusions:

  • The interplay of microbial processes in OMZs creates a direct pathway for organic nitrogen to be lost from the ocean.
  • Accurate prediction of oceanic nitrogen balance under global change requires overcoming challenges in measuring microbial activities in OMZs.
  • Further research is needed to understand the ecophysiology and biogeochemistry of OMZ microbes.