Measurements of culture cell density (cells L⁻¹×10⁶), dissolved nitrate+nitrite concentrations (NO₃⁻ + NO₂⁻, µmol L⁻¹) and N₂-fixation rates (fmol cell⁻¹ hr⁻¹) at different time points (hours since culture dilution) in cultures used in the short- and long-term exposure experiments.

<p>*calculated NO₃⁻ concentrations.</p><p>Error (±) represents the standard deviation on 3 culture replicates.</p><p>Measurements of culture cell density (cells L⁻¹×10⁶), dissolved nitrate+nitrite concentrations (NO₃⁻ + NO₂⁻, µmol L⁻¹) and N₂-fixation rates (fmol cell⁻¹ hr⁻¹) at different time points (hours since culture dilution) in cultures used in the short- and long-term exposure experiments.