NO₃^- reduction and N₂O production rates.

<p>NO₃^- reduction rate (black bars; left y-axis) and N₂O production rates (white bars; right y-axis) during the measurement of the denitrification potential for the different treatments (mean ± SE; cop. = copepods; cop. + dia. = copepod+ diatom). The different letters above the bar indicate significant differences (P<0.05; DTK) between the treatments. Light conditions (not shown) did not affect the outcome of treatments.