The micronutrient iron is now recognized to be important in regulating the magnitude and
dynamics of ocean primary productivity, making it an integral component of the ocean's …

Microbial activity is a fundamental component of oceanic nutrient cycles. Photosynthetic
microbes, collectively termed phytoplankton, are responsible for the vast majority of primary …

Nutrient availability limits phytoplankton growth throughout much of the global ocean. Here
we synthesize available experimental data to identify three dominant nutrient limitation …

Advances in iron biogeochemistry have transformed our understanding of the oceanic iron
cycle over the past three decades: multiple sources of iron to the ocean were discovered …

Abstract Subtropical gyres cover 26%–29% of the world's surface ocean and are
conventionally regarded as ocean deserts due to their permanent stratification, depleted …

Biological N2 fixation is an important part of the marine nitrogen cycle as it provides a source
of new nitrogen that can support biological carbon export and sequestration. Research in …

The ocean's nitrogen cycle is driven by complex microbial transformations, including
nitrogen fixation, assimilation, nitrification, anammox and denitrification. Dinitrogen is the …

Discrepancies between estimates of oceanic N 2 fixation and nitrogen (N) losses through
denitrification have focused research on identifying N 2-fixing cyanobacteria and quantifying …

We report a new synthesis of best estimates of the inputs of fixed nitrogen to the world ocean
via atmospheric deposition and compare this to fluvial inputs and dinitrogen fixation. We …

Nitrogen fixation is critical for the biological productivity of the ocean, but clear mechanistic
controls on this process remain elusive. Here, we investigate the abundance, activity, and …