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Ammonium (NH4+, bars, μmol/L), nitrate (NO3−, squares, μmol/L), and phosphate (PO43−, circles, μmol/L) (a) heterotrophic bacteria (HB, line, cells/mL) and chitinase activity (NAG, nM/h, bars) (b) plotted against chlorophyll a levels (area, μg/L) during the course of IMPACTS.
