The way that nutrients cycle through atmospheric, terrestrial, oceanic and associated biotic
reservoirs can constrain rates of biological production and help structure ecosystems on …

The dominant process adding nitrogen (N) to the ocean, di-nitrogen (N2) fixation, is
mediated by prokaryotes (diazotrophs) sensitive to a variety of environmental factors. In …

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 …

Oceanic fixed-nitrogen concentrations are controlled by the balance between nitrogen
fixation and denitrification,,,. A number of factors, including iron limitation,,, can restrict …

Biological dinitrogen fixation provides the largest input of nitrogen to the oceans, therefore
exerting important control on the ocean's nitrogen inventory and primary productivity …

Marine N2 fixation supports a significant portion of oceanic primary production by making N2
bioavailable to planktonic communities, in the process influencing atmosphere-ocean …

Nutrients are supplied to the mixed layer of the open ocean by either atmospheric deposition
or mixing from deeper waters, and these nutrients drive nitrogen and carbon fixation. To …

Nitrogen, as a building block in the structures of nucleic and amino acids, porphyrins, and
amino sugars, is a fundamental player in many biogeochemical cycles. 1 It also shares with …

Over the last 30 years, immense progress has been made in understanding the global
significance of marine nitrogen (N~ 2~) fixation. Development of enzymological, isotopic and …

Oceanic subtropical gyres are considered biological deserts because of the extremely low
availability of nutrients and thus minimum productivities. The major source of nutrient …