Articles | Volume 19, issue 14
Biogeosciences, 19, 3425–3444, 2022
Biogeosciences, 19, 3425–3444, 2022
Research article
20 Jul 2022
Research article | 20 Jul 2022

Controls on nitrite oxidation in the upper Southern Ocean: insights from winter kinetics experiments in the Indian sector

Mhlangabezi Mdutyana et al.

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Cited articles

Amin, S. A., Moffett, J. W., Martens-Habbena, W., Jacquot, J. E., Han, Y., Devol, A., Ingalls, A. E., Stahl, D. A., and Armbrust, E. V.: Copper requirements of the ammonia-oxidizing archaeon Nitrosopumilus maritimus SCM1 and implications for nitrification in the marine environment, Limnol. Oceanogr., 58, 2037–2045,, 2013. 
Archontoulis, S. V. and Miguez, F. E.: Nonlinear regression models and applications in agricultural research, Agron. J., 107, 786–798,, 2014. 
Arp, D. J., Sayavedra-Soto, L. A., and Hommes, N. G.: Molecular biology and biochemistry of ammonia oxidation by Nitrosomonas europaea, Arch. Microbiol., 178, 250–255,, 2002. 
Baer, S. E., Connelly, T. L., Sipler, R. E., Yager, P. L., and Bronk, D. A.: Effect of temperature on rates of ammonium uptake and nitrification in the western coastal Arctic during winter, spring, and summer, Global Biogeochem. Cy., 28, 1455–1466,, 2014. 
Bayer, B., Saito, M. A., McIlvin, M. R., Lücker, S., Moran, D. M., Lankiewicz, T. S., Dupont, C. L., and Santoro, A. E.: Metabolic versatility of the nitrite-oxidizing bacterium Nitrospira marina and its proteomic response to oxygen-limited conditions, ISME J., 15, 1025–1039,, 2021. 
Short summary
Nitrite-oxidizing bacteria in the winter Southern Ocean show a high affinity for nitrite but require a minimum (i.e., "threshold") concentration before they increase their rates of nitrite oxidation significantly. The classic Michaelis–Menten model thus cannot be used to derive the kinetic parameters, so a modified equation was employed that also yields the threshold nitrite concentration. Dissolved iron availability may play an important role in limiting nitrite oxidation.
Final-revised paper