Table 1.

Mixed effect linear model results for biomass and proportion of species plus the Shannon evenness index (E′)

lme model	Block (random)			Summer	Winter	Year	Water depth	Summer × Winter	Summer × Year	Summer × Depth	Winter × Year	Winter × Depth	Year × Depth	Month/Year
	Δdf	1	df	1,226	1,226	3,226	1,226	1,226	3,226	1,226	3,226	1,226	3,226	4,226
Potamogeton pectinatus d.w.	LR	<0.001	F	412.833	3.061	10.129	2.406	1.358	6.889	0.006	1.122	0.018	2.867	16.197
3√d.w. (g)	P	>0.999	P	<0.001	0.082	<0.001	0.122	0.245	<0.001	0.938	0.341	0.894	0.037	<0.001
P. pectinatus %	LR	0.162	F	36.955	4.877	22.571	8.258	0.948	9.330	5.396	1.083	0.806	4.840	1.899
Arcsine√(fraction)	P	0.688	P	<0.001	0.028	<0.001	0.004	0.331	<0.001	0.021	0.357	0.370	0.003	0.112
Potamogeton pusillus d.w.	LR	0.094	F	35.224	4.208	16.303	8.305	5.693	5.768	32.071	0.339	0.435	8.619	35.971
3√d.w. (g)	P	0.759	P	<0.001	0.041	<0.001	0.004	0.018	0.001	<0.001	0.797	0.510	<0.001	<0.001
P. pusillus %	LR	0.001	F	31.354	3.025	21.636	6.285	2.033	7.857	6.362	1.176	0.509	6.110	3.258
Arcsine√(fraction)	P	0.975	P	<0.001	0.083	<0.001	0.013	0.155	<0.001	0.012	0.320	0.477	<0.001	0.013
Zannichellia palustris d.w..	LR	<0.001	F	0.224	16.746	33.681	48.180	2.317	5.034	17.036	1.749	1.103	0.634	5.984
3√d.w. (g)	P	>0.999	P	0.637	<0.001	<0.001	<0.001	0.129	0.002	<0.001	0.158	0.295	0.594	<0.001
Z. palustris %	LR	<0.001	F	26.451	7.173	8.507	29.962	0.383	4.414	0.023	0.680	0.551	2.514	5.170
Arcsine√(fraction)	P	>0.999	P	<0.001	0.008	<0.001	<0.001	0.536	0.005	0.880	0.565	0.459	0.059	0.001
Evenness	LR	<0.001	F	22.955	0.252	5.041	13.718	2.281	3.405	6.265	0.575	0.383	2.788	3.715
E′	P	>0.999	P	<0.001	0.617	0.002	<0.001	0.132	0.019	0.013	0.632	0.537	0.042	0.006

Main effects and two-way interactions are included. Significance of the random variable plot was assessed through elimination and comparison of the goodness of fit using a likelihood ratio (LR) test. Significant effects are indicated in bold

d.w. Dry weight