Fig. 5From: The short-term effects of elevated CO2 and ammonium concentrations on physiological responses in Gracilariopsis lemaneiformis (Rhodophyta)Photosynthetic efficiency (F v/F m) of Gracilariopsis lemaneiformis at 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