Fig. 4From: The short-term effects of elevated CO2 and ammonium concentrations on physiological responses in Gracilariopsis lemaneiformis (Rhodophyta)Ammonium uptake rates (μmol NH4 + g−1 FW h−1) of Gracilariopsis lemaneiformis under different pH levels and NH4 + treatments. Bars not labeled with same letter indicate significant differences among culture conditions at p < 0.05. Values are means ± SD (n = 4)Back to article page