Table 2. Two-way ANOVA to test for the effects of extracts from macroalgae [Canistrocarpus (=Dictyota) cervicornis (Can), Chlorodesmis fastigiata (Chlo), and Amansia glomerata (Ama)] grown under two CO₂ levels [ambient (Amb) and high] on effective quantum yield (EQY) of Acropora intermedia corals (as a measure of the potency of allelopathic extracts; Fig. 3).

Source of variation	df	MS	F	p-value	Conclusion (Tukey Test)
CO2	1	<0.001	0.111	Can: 0.037	Can: Ambient > High
				Chlo: 0.775	Chlo: ns
				Ama: 0.074	Ama: ns
Algae	2	0.006	3.511	Ambient: 0.078	Ambient: ns
				High: 0.025	High: Ama > Can = Chlo
CO2*Algae	2	0.005	3.073	0.052
Error	164	6.7