Nitrogen fixation in eastern tropical South Pacific

Using biological and geochemical measurements, a study finds that rates of nitrogen fixation, a major source of nitrogen in the ocean, in the eastern tropical South Pacific (ETSP) ocean are a minor fraction of previously modeled rates, which predict that the ETSP ocean hosts the highest marine nitrogen fixation rates in the world, and the results instead suggest that low oceanic iron concentrations may limit regional nitrogen fixation. - See at PNAS.org

Article #15-15641: “Low rates of nitrogen fixation in eastern tropical South Pacific surface waters,” by Angela N. Knapp, Karen L. Casciotti, William M. Berelson, Maria G. Prokopenko, and Douglas G. Capone.