Abstract
The effect of phosphate (PO4+3) and pH in regulating nitrate (NO3) and ammonia (NH3+) uptake by phytoplankton was investigated in two Oklahoma lakes using 15N tracers. Addition of PO4+3 above ambient concentrations had a negligible effect on the rate of uptake of NO3− or NH3+. Manipulation of pH of lake water had little effect on uptake of either NO3− or NH3+. A correlation analysis suggested that NO3− is not used by phytoplankton when NH3+ concentrations exceed about 210 µg NH3+-N(1)−1.
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