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Aquatic nitrogen transformations at low oxygen concentrations.

M T Downes1

  • 1Taupo Research Laboratory, Department of Scientific and Industrial Research, New Zealand.

Applied and Environmental Microbiology
|January 1, 1988
PubMed
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In Lake Rotoiti, nitrite and nitrous oxide comprised 40% of nitrogen before anoxia. Ammonium-oxidizing bacteria produced these gases, with nitrous oxide resulting from nitrifier denitrification.

Area of Science:

  • Environmental microbiology
  • Aquatic chemistry
  • Limnology

Background:

  • Hypolimnetic anoxia significantly alters nitrogen cycling in lakes.
  • Dissolved inorganic nitrogen (DIN) dynamics are crucial for understanding lake eutrophication and biogeochemical processes.

Purpose of the Study:

  • To investigate the contribution of nitrite and nitrous oxide to DIN in a mesotrophic lake prior to anoxia.
  • To identify the microbial processes responsible for nitrite and nitrous oxide accumulation under low dissolved oxygen conditions.

Main Methods:

  • Measurement of dissolved oxygen, nitrite, nitrous oxide, and dissolved inorganic nitrogen concentrations.
  • Assays of water column nitrification potentials.
  • Determination of relative rates of nitrate and nitrite reduction.

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Main Results:

  • Nitrite and nitrous oxide constituted 40% of hypolimnetic DIN before anoxia.
  • Accumulations of up to 120 mg N m-3 nitrite and 20 mg N m-3 nitrous oxide were observed.
  • Dissolved oxygen was depleted from 1.0-0.2 g m-3 to zero during anoxia.

Conclusions:

  • Ammonium-oxidizing bacteria are the primary producers of nitrite and nitrous oxide at low dissolved oxygen levels.
  • Nitrous oxide is a product of nitrifier denitrification under these conditions.
  • These findings highlight the importance of microbial processes in nitrogen cycling during the onset of lake anoxia.