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Relative to inorganic nitrogen, concentrations of dissolved organic nitrogen(DON) are often high, even in regions believed to be nitrogen-limited. Thepersistence of these high concentrations led to the view that the DON poolwas largely refractory and therefore unimportant to plankton nutrition. AnyDON that was utilized was believed to fuel bacterial production. More recentwork, however, indicates that fluxes into and out of the DON pool can belarge, and that the constancy in concentration is a function of tightlycoupled production and consumption processes. Evidence is also accumulatingwhich indicates that phytoplankton, including a number of harmful species,may obtain a substantial part of their nitrogen nutrition from organiccompounds. Ongoing research includes ways to discriminate betweenautotrophic and heterotrophic utilization, as well as a number ofmechanisms, such as cell surface enzymes and photochemical decomposition,that could facilitate phytoplankton use of DON components

DON as a source of bioavailable nitrogen for phytoplankton