BACKGROUND Biological dinitrogen (N2) fixation, the reduction of atmospheric N2 to
ammonia, is important for maintaining the fertility of the oceans by providing biologically …

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 …

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 …

Biodiversity of phytoplankton is important for ecosystem stability and marine
biogeochemistry. However, the large-scale patterns of diversity are not well understood and …

Persistent nitrogen depletion in sunlit open ocean waters provides a favorable ecological
niche for nitrogen-fixing (diazotrophic) cyanobacteria, some of which associate symbiotically …

Aerobic anoxygenic phototrophs (AAnPs) are common in marine environments and are
associated with photoheterotrophic activity. To date, AAnPs that possess the potential for …

In the open ocean, elevated carbon flux (ECF) events increase the delivery of particulate
carbon from surface waters to the seafloor by severalfold compared to other times of year …

In the surface ocean, phytoplankton transform inorganic substrates into organic matter that
fuels the activity of heterotrophic microorganisms, creating intricate metabolic networks that …

Bacteria and archaea are central to the production, consumption, and remineralization of
dissolved and particulate organic matter and contribute critically to carbon delivery, nutrient …

Marine microorganisms are immensely diverse and play fundamental roles in global
geochemical cycling. Recent metagenome-assembled genome studies, with particular …