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

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 …

Phosphorus is an obligate requirement for the growth of all organisms; major biochemical
reservoirs of phosphorus in marine plankton include nucleic acids and phospholipids …

Phosphorus (P) is a required element for life. Its various chemical forms are found
throughout the lithosphere and hydrosphere, where they are acted on by numerous abiotic …

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 …

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 …

Climate change will alter concurrently many environmental factors that exert control over
oceanic phytoplankton. Recent laboratory culture work, shipboard experiments, and field …

Land to ocean transfer of material largely controls the chemical composition of seawater and
the global element cycles. Overall this transfer is dominated by the riverine transport of …

Phosphorus is an essential macronutrient for all marine microorganisms. Dissolved organic
phosphorus (DOP) is an integral, dynamic part of the marine organic matter pool and of the …

Marine plankton elemental stoichiometric ratios can deviate from the Redfield ratio (106C:
16N: 1P); here, we examine physiological and biogeochemical mechanisms that lead to the …