Nitrate uptake rate did not differ among the salinity treatments (ANOVA, d.f. = 11,
F = 2.814, P = 0.112; Table 1). The FSW used for the NO3
− uptake experiments initially
contained ∼6MNH4
+. The algae took up this NH4
+ during the experiment, leaving less
than 1Mafter 120 min except in the controls (no algae enclosed). Incidentally, in all three
treatments, nitrate uptake rate gradually increased over the first 120 min before remaining
roughly constant.