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

ABSTRACT: 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 (15)N2 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. How

SUBMITTER: Wilson ST 

PROVIDER: S-EPMC4271820 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature