Recent work has suggested that the oxygen deficient zone (ODZ) and overlying surface waters of the eastern tropical South Pacific (ETSP) is a potential niche for dinitrogen (N-2) fixation. Rates of dinitrogen fixation were measured in the ETSP above and within the ODZ in July 2013 using a modified N-15(2) bubble addition method, wherein a bubble was added, mixed, and then removed, and the isotopic enrichment of the dissolved N-2 was measured directly for each incubation. N-2 fixation rates in the euphotic zone ranged from below detection to 3.9 nmol L-1 d(-1) and were below detection at all depths surveyed within the ODZ. Depth-integrated rates ranged from below detection to 289.7 mu mol m(-2) d(-1). DNA and RNA of diverse nifH genes were detected at both surface waters and in the ODZ. However, the results of this study suggest that N-2 fixation rates were low and contribute little to N cycling in the ETSP.
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