Seasonal and inter-annual variation in the chlorophyll content of three co-existing Sphagnum species exceeds the effect of solar UV reduction in a subarctic peatland

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Table 1 Effect of UVB treatment, species, and sampling date on concentration of chlorophyll a and b, total chlorophyll (a + b) and a/b ratio

Source	Chl a		Chl b		Chl a + b		Chl a/b
Source	F	p value	F	p value	F	p value	F	p value
Treatment	4.3	0.017	2.8	0.067	3.8	0.025	0.5	0.636
Species	52.1	<0.001	63.8	<0.001	56.4	<0.001	13.4	<0.001
Date	90.7	<0.001	79.9	0.000	90.8	<0.001	7.3	<0.001
Treatment × species	1.0	0.391	0.7	0.620	0.8	0.500	0.4	0.776
Treatment × date	3.4	0.003	2.3	0.037	3.2	0.005	1.7	0.124
Species × date	11.1	<0.001	7.2	<0.001	10.1	<0.001	8.3	<0.001
Treatment × species × date	2.0	0.050	1.6	0.127	1.8	0.088	4.7	<0.001

For each effect and their interactions F values and statistical significance of mixed linear model analysis are presented