The conundrum of marine N2 fixation

The sensitivity of marine N2 fixation to dissolved inorganic nitrogen

The dominant process adding nitrogen (N) to the ocean, di-nitrogen (N(2)) fixation, is mediated by prokaryotes (diazotrophs) sensitive to a variety of environmental factors. In particular, it is often assumed that consequential rates of marine N(2) fixation do not occur where concentrations of nitrate (NO(-) (3)) and/or ammonium (NH(+) (4)) exceed 1μM because of the additional energetic cost as...

Fate of N2 fixation

Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract While we now know that marine N 2 fixation is a significant source of new nitrogen (N) in the marine environment, little is known about the fate of this production, de...

Interactions Between Changing pCO2, N2 Fixation, and Fe Limitation in the Marine Unicellular Cyanobacterium Crocosphaera

We examined the physiological responses of steady-state iron (Fe)-replete and Fe-limited cultures of the biogeochemically critical marine unicellular diazotrophic cyanobacterium Crocosphaera at glacial (19 Pa; 190 ppm), current (39 Pa; 380 ppm), and projected year 2100 (76 Pa; 750 ppm) CO2 levels. Rates of N2 and CO2 fixation and growth increased in step with increasing partial pressure of CO2 ...

Deep Into Oceanic N2 Fixation

THE CONUNDRUM OF EUTHANASIA