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Dependence of nitrite oxidation on nitrite and oxygen in low-oxygen seawater

Author(s): Sun, Xin; Ji, Qixing; Jayakumar, Amal; Ward, Bess B

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Abstract: Nitrite oxidation is an essential step in transformations of fixed nitrogen. The physiology of nitrite oxidizing bacteria (NOB) implies that the rates of nitrite oxidation should be controlled by concentration of their substrate, nitrite, and the terminal electron acceptor, oxygen. The sensitivities of nitrite oxidation to oxygen and nitrite concentrations were investigated using 15N tracer incubations in the Eastern Tropical North Pacific. Nitrite stimulated nitrite oxidation under low in situ nitrite conditions, following Michaelis‐Menten kinetics, indicating that nitrite was the limiting substrate. The nitrite half‐saturation constant (Ks = 0.254 ± 0.161 μM) was 1–3 orders of magnitude lower than in cultivated NOB, indicating higher affinity of marine NOB for nitrite. The highest rates of nitrite oxidation were measured in the oxygen depleted zone (ODZ), and were partially inhibited by additions of oxygen. This oxygen sensitivity suggests that ODZ specialist NOB, adapted to low‐oxygen conditions, are responsible for apparently anaerobic nitrite oxidation.
Publication Date: 28-Jun-2017
Citation: Sun, Xin, Qixing Ji, Amal Jayakumar, and Bess B. Ward. "Dependence of nitrite oxidation on nitrite and oxygen in low‐oxygen seawater." Geophysical Research Letters 44, no. 15 (2017): 7883-7891. doi:10.1002/2017GL074355.
DOI: doi:10.1002/2017GL074355
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 7883 - 7891
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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