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. 2019 Mar 25;13(8):1960–1974. doi: 10.1038/s41396-019-0386-z

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© The Author(s) 2019

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Fig. 4 — Ammonium dynamics in surface waters during N-depletion. Added ¹⁵N-ammonium decreased exponentially with time (a) and was mostly recovered in the biomass filtered onto GF/F filters (b), while total ammonium concentrations (measured after ¹⁵N-ammonium was added) remained at steady-state (c). Data are given as mean ± s.d. (n = 3) and are shown for incubations from June 2012 (a–c). Gross ammonium production and consumption rates (measured in June 2012 and August 2013) were positively correlated, following a close to 1:1 ratio (dashed line) (d). The rapid ammonium turn-over due to ammonium regeneration within 1 h could substantially sustain the N-demand for primary production (e)