Table 3. The effects of time of sampling (morning vs. afternoon) and treatment factors (light vs shade) on water chemistry in the laboratory experiment.

		pH		DO			ALK		DIC		DOC		Si		SRP
	df	F	p	F	p	df	F	p	F	p	F	p	F	p	F	p
Irradiance	1	66.2	<0.0001	703	<0.0001	1	29.7	<0.0001	38.4	<0.0001	0.418	0.5251	2.81	0.1092	0.056	0.8151
Time	1	40.5	<0.0001	162	<0.0001	1	14.8	0.0010	16.5	0.0006	0.639	0.4336	0.477	0.4979	2.41	0.1360
Irradiance:Time	1	19.2	<0.0001	88.8	<0.0001	1	2.44	0.1337	3.49	0.0765	0.009	0.9252	11.2	0.0033	0.017	0.8966
Residuals	109					20

pH, dissolved oxygen saturation (DO, %), alkalinity (ALK, µEq/kg), concentrations of dissolved inorganic carbon (DIC, µM), dissolved organic carbon (DOC, mg L⁻¹) silicic acid (Si, µM) and soluble reactive phosphorus (SRP, µM) in the treatment units. Results of linear mixed-effects models comparing controls only (no algal water added; treatment  =  light versus shade).