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Table 2 Results from two-way ANOVA of physiological activities (relative growth rate (% day−1), extent of variation in pH, photosynthetic oxygen evolution rate (μmol O2 g−1 FW h−1), ammonium uptake rate (μmol NH4 + g−1 FW h−1), and photosynthetic efficiency (F v/F m)) by samples of Gracilariopsis lemaneiformis

From: The short-term effects of elevated CO2 and ammonium concentrations on physiological responses in Gracilariopsis lemaneiformis (Rhodophyta)

Parameter/source of variation df MS F value p value
Relative growth rate
 pH level 1 0.69 21.50 <0.01
 NH4 + concentration 2 4.26 132.54 <0.01
 pH level × NH4 + concentration 2 0.12 3.66 0.04
Extent of variation in pH
 pH level 1 1.09 166.48 <0.01
 NH4 + concentration 2 0.38 57.63 <0.01
 pH × NH4 + 2 0.01 0.10 0.90
Photosynthetic oxygen evolution rate
 pH level 1 198.72 68.85 <0.01
 NH4 + concentration 2 3678.60 1274.53 <0.01
 pH × NH4 + 2 22.50 7.80 <0.01
NH4 + uptake rate     
 pH level 1 0.17 24.72 <0.01
 NH4 + concentration 2 85.78 12,108.59 <0.01
 pH × NH4 + 2 0.13 18.95 <0.01
Photosynthetic efficiency
 pH level 1 <0.01 0.58 0.46
 NH4 + concentration 2 0.13 51.60 <0.01
 pH × NH4 + 2 <0.01 0.92 0.42