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To estimate the release of DON (dissolved orDOM release from planktonic alqae has been examganic nitrogen) by freshwater planktonic algae, we modified ined using dissolved organic carbon (DO(-) or disthe Bronk & Glibert method used for marine planktonic algae, solved organic nitrogen (DON). DOC release has been by adding NaCl (3.5%) to the freshwater samples and using ,on retardation resin columns to separate DON from inorganic studied mostly using I4c tracers (Fogg et al. 1965, Watt nitrogen in the solutions. Clear separation and high recover1966, Nalewajko & Schindler 1976, Lancelot 1979, ies oiamino acids indicate that the ion retardation resin colMaaue et al. 1980. Giordano et al. 1994) and DON d umn method can be a ~ ~ h e d to freshwater We derelease using 1 5 ~ tracers (Axle1 & Reuter 1986, Bronk rived equations for the calculation of DON release and net DIN (dissolved inorganic nitrogen) assimilation which enable & Glibert 1991, 1993b, 1994, Glibert & Bronk 1994). the estimation of the TNR (total nitrogen release) and NNA DON release in freshwater environments (Axler & (net nitrogen assimilation). Further, we derived equations to Reuter 1986) has only been peripherally examined A estimate RANR (recently assirmlated nitrogen release; release to'marine of DON produced from DIN assimilated dunng ISN incubation), and PANR (previously assimilated nitrogen release; reIn most of the previous studies on DOM release, exlease of DON produced before the incubation). Using the tracellular DIM (dissolved inorganic matter) has been modified method and equations, we examined time courses of used as the tracer source (e.g. Fogg et al. 1965, Watt DON release from the cyanobacterium Microcystis novacekii. 1966). Release of total DOM has been estimated by the Both TNR and NNA increased with time during 15N incubacalculation analogous to that for DIM uptake ( ~ ~ ~ d ~ l ~ tion, with more than 91 % of the TNR consisting of RANR. & Goering 1967) when stable isotopes are used as trac

A modified 15N tracer method and new calculation for estimating release of dissolved organic nitrogen by freshwater planktonic algae