Diversity and activity of nitrogen-fixing communities across ocean basins

  title={Diversity and activity of nitrogen-fixing communities across ocean basins},
  author={Mary R. Gradoville and Deniz Bombar and Byron C Crump and Ricardo Letelier and Jonathan P. Zehr and Angelicque E. White},
Recent observations of N2 fixation rates (NFR) and the presence of nitrogenase (nifH) genes from heterotrophic N2-fixing (diazotrophic) prokaryotes in unusual habitats challenge the paradigm that pelagic marine N2 fixation is constrained to cyanobacteria in warm, oligotrophic, surface waters. Here, we compare NFR and diazotrophic diversity (assessed via high-throughput nifH sequencing) from a region known to be dominated by cyanobacterial diazotrophs (the North Pacific Subtropical Gyre, NPSG… CONTINUE READING


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