Nitrogen (N) is used in many of life's fundamental biomolecules, and it is also a participant in
environmental redox chemistry. Biogeochemical processes control the amount and form of N …

Nitrogen (N) is one of the primary nutrients required to build biomass and is therefore in high
demand in aquatic ecosystems. Estuaries, however, are frequently inundated with high …

Marine diazotrophs convert dinitrogen (N 2) gas into bioavailable nitrogen (N), supporting
life in the global ocean. In 2012, the first version of the global oceanic diazotroph database …

Background N fixation is one of the most important microbially driven ecosystem processes
on Earth, allowing N to enter the soil from the atmosphere, and regulating plant productivity …

Iron is an essential nutrient that regulates productivity in~ 30% of the ocean. Compared with
deep (> 2000 meter) hydrothermal activity at mid-ocean ridges that provide iron to the …

The role of iron in enhancing phytoplankton productivity in high nutrient, low chlorophyll
oceanic regions was demonstrated first through iron-addition bioassay experiments and …

Marine N 2 fixing microorganisms, termed diazotrophs, are a key functional group in marine
pelagic ecosystems. The biological fixation of dinitrogen (N 2) to bioavailable nitrogen …

The surface water of the marine environment has traditionally been viewed as a nitrogen (N)
limited habitat, and this has guided the development of conceptual biogeochemical models …

The two commonly applied methods to assess dinitrogen (N2) fixation rates are the 15N2-
tracer addition and the acetylene reduction assay (ARA). Discrepancies between the two …

The broad distribution and often high densities of the cyanobacterium Trichodesmium spp.
in oligotrophic waters imply a substantial role for this one taxon in the oceanic N cycle of the …