Table 3. Two-way ANOVA tests analysing direct and combined effects of low pH and thermal-stress (+2 °C) on three coralline species: Neogoniolithon sp. (rhodolith), Amphiroa tribulus (articulated) and the CCA Lithothamnion sp. P_max, maximum gross photosynthesis (μmol O₂ cm⁻² h⁻¹); R_L, Post-illumination Respiration (μmol O₂ cm⁻² h⁻¹); and G_max, maximum calcification rate (μmol CaCO₃ cm⁻² h⁻¹).

	Rodoliths		F	P	Articulated		F	P	CCA	MS	F	P
	df	MS			df	MS			df
Source of variation
Pmax
pH	1	0.564	3.35	0.08	1	0.255	1.75	0.199	1	<0.001	0.001	0.981
Temp.	1	5.319	31.5	<0.05*	1	6.298	43.44	<0.05*	1	0.603	83.014	<0.05*
pH*temp.	1	0.254	1.5	0.232	1	0.001	0.009	0.926	25	0.003	0.428	0.519
Error	24	0.168			21	0.145				0.007
RL
pH	1	0.07	1.804	0.192	1	0.012	0.677	0.419	1	0.005	1.522	0.229
Temp.	1	1.173	30.393	<0.05*	1	1.478	84.274	<0.05*	1	0.112	36.563	<0.05*
pH*temp.	1	0.005	0.132	0.72	1	0.028	1.619	0.216	1	<0.001	0.023	0.882
Error	24	0.039			21	0.018			25	0.003
Gmax
pH	1	0.308	19.17	<0.05*	1	0.074	29.6	<0.05*	1	0.029	18.235	<0.05*
Temp.	1	0.59	36.62	<0.05*	1	1.207	483.14	<0.05*	1	0.111	69.577	<0.05*
pH*temp.	1	0.001	0.056	0.816	1	0.089	35.58	<0.05*	1	<0.001	0.074	0.788
Error	16	0.016			22	0.002			23	0.002