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Lookup NU author(s): Professor Sam Wilson
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The production of hydrogen (H2) is an inherent component of biological dinitrogen (N2) fixation, and there have been several studies quantifying H2 production relative to N2 fixation in cultures of diazotrophs. However, conducting the relevant measurements for a field population is more complex as shown by this study of N2 fixation, H2 consumption and dissolved H2 concentrations in the oligotrophic North Pacific Ocean. Measurements of H2 oxidation revealed microbial consumption of H2 was equivalent to 1-7% of ethylene produced during the acetylene reduction assay and 11-63% of 15N2 assimilation on a molar scale. Varying abundances of Crocosphaera and Trichodesmium as revealed by nifH gene abundances broadly corresponded with diel changes observed in both N2 fixation and H2 oxidation. However, no corresponding changes were observed in the dissolved H2 concentrations which remained consistently supersaturated (147-560%) relative to atmospheric equilibrium. The results from this field study allow the efficiency of H2 cycling by natural populations of diazotrophs to be compared to cultured representatives. The findings indicate that dissolved H2 concentrations may depend not only on the community composition of diazotrophs but also upon relevant environmental parameters such as light intensity or the presence of other H2-metabolizing microorganisms. © 2013 The Authors. Environmental Microbiology Reports published by John Wiley & Sons Ltd and Society for Applied Microbiology.
Author(s): Wilson ST, del Valle DA, Robidart JC, Zehr JP, Karl DM
Publication type: Article
Publication status: Published
Journal: Environmental Microbiology Reports
Year: 2013
Volume: 5
Issue: 5
Pages: 697-704
Print publication date: 02/10/2013
Online publication date: 13/05/2013
Date deposited: 08/12/2021
ISSN (print): 1462-2912
ISSN (electronic): 1758-2229
Publisher: Wiley-Blackwell Publishing Ltd.
URL: https://doi.org/10.1111/1758-2229.12069
DOI: 10.1111/1758-2229.12069
PubMed id: 24115620
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