Microbial Ecology

, Volume 6, Issue 4, pp 339–347 | Cite as

Effects of temperature, ph, salinity, and inorganic nitrogen on the rate of ammonium oxidation by nitrifiers isolated from wetland environments

  • R. D. Jones
  • Mary A. Hood


Ammonium-oxidizing bacteria were examined in two wetland environments, a freshwater marsh and an estuarine bay, during a 2-year period. Two predominant types were consistently isolated, one from each environment. Both isolates were identified as species ofNitrosomonas. Using a closed culture, high cell density assay, the effects of temperature, pH, salinity, Na+, K+, nitrite, nitrate, and ammonium concentrations on ammonium oxidation were determined. Maximum activity was observed for the freshwater isolate at 35°C, pH 8.5, salinities of 0.3 to 0.5% Na+ and K+, and ammonium concentrations greater than 0.5 g/l. For the estuarine isolate, maximum activity was observed at 40°C, pH 8.0, salinities of 0.5 to 1.0%, 1.0% Na+ and K+, and 0.2 g/l ammonium. The estuarine isolate had a Na+ requirement which could be partially substituted by the K+, suggesting that the organism is a true estuarine bacterium. Nitrite inhibited both isolates at concentrations greater than 5 mg/l, whereas nitrate had no significant effect on either isolate.


Nitrate Nitrite Cell Density Maximum Activity High Cell 
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Copyright information

© Springer-Verlag New York Inc. 1980

Authors and Affiliations

  • R. D. Jones
    • 1
  • Mary A. Hood
    • 1
  1. 1.Department of BiologyUniversity of West FloridaPensacola

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