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Dissolved hydrogen and nitrogen fixation in the oligotrophic North Pacific Subtropical Gyre.


ABSTRACT: SummaryThe production of hydrogen (H) is an inherent component of biological dinitrogen (N) fixation, and there have been several studies quantifying H production relative to N fixation in cultures of diazotrophs. However, conducting the relevant measurements for a field population is more complex as shown by this study of N fixation, H consumption and dissolved H concentrations in the oligotrophic North Pacific Ocean. Measurements of H oxidation revealed microbial consumption of H was equivalent to 1–7% of ethylene produced during the acetylene reduction assay and 11–63% of N assimilation on a molar scale. Varying abundances of C and T as revealed by H gene abundances broadly corresponded with diel changes observed in both N fixation and H oxidation. However, no corresponding changes were observed in the dissolved H concentrations which remained consistently supersaturated (147–560%) relative to atmospheric equilibrium. The results from this field study allow the efficiency of H cycling by natural populations of diazotrophs to be compared to cultured representatives. The findings indicate that dissolved H 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 H‐metabolizing microorganisms.

SUBMITTER: Wilson ST 

PROVIDER: S-EPMC4809409 | biostudies-other | 2013 Oct

REPOSITORIES: biostudies-other

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