Table 1.

Linear mixed-effect model results for the effects of temperature and species on the plant growth and sediment pore water nutrient parameters, plant traits and RCR.

Category	Parameters	Factors	df	F	p	Means comparison among species
Plant growth	Shoot biomass	Temperature	1, 13	211.93	<0.001	P. lucens > V. spiralis = E. nuttallii
		Species	2, 110	82.45	<0.001
		Temp.* Species	2, 110	43.68	<0.001
	Root biomass	Temperature	1, 13	56.99	<0.001	P. lucens = V. spiralis > E. nuttallii
		Species	2, 110	131.39	<0.001
		Temp.* Species	2, 110	20.87	<0.001
	Growth rate	Temperature	1, 13	43.45	<0.001	P. lucens > V. spiralis > E. nuttallii
		Species	2, 110	429.65	<0.001
		Temp.* Species	2, 110	8.47	<0.001
	Root:Shoot ratio	Temperature	1, 13	4.54	0.053	V. spiralis > P. lucens > E. nuttallii
		Species	2, 110	419.52	<0.001
		Temp.* Species	2, 110	23.27	<0.001
Porewater nutrients	TINa	Temperature	1, 13	3.68	0.077	E. nuttallii > P. lucens = V. spiralis
		Species	2, 26	12.62	<0.001
		Temp.* Species	2, 26	2.05	0.149
	PO${}_4^{3-}$	Temperature	1, 13	16.76	0.001	E. nuttallii > P. lucens = V. spiralis
		Species	2, 26	8.78	0.001
		Temp.* Species	2, 26	3.17	0.059
Palatability	RCRb	Temperature	1, 13	4.01	0.067	P. lucens = V. spiralis > E. nuttallii
		Species	2, 112	8.42	<0.001
Traits	Dry matter content	Temperature	1, 13	2.15	0.166	P. lucens > E. nuttallii > V. spiralis
		Species	2, 110	448.82	<0.001
		Temp.* Species	2, 110	8.80	<0.001
	C content	Temperature	1, 13	0.83	0.378	P. lucens > E. nuttallii = V. spiralis
		Species	2, 110	67.57	<0.001
		Temp.* Species	2, 110	16.70	<0.001
	N content	Temperature	1, 13	5.57	0.035	E. nuttallii > P. lucens > V. spiralis
		Species	2, 110	17.51	<0.001
		Temp.* Species	2, 110	6.85	0.002
	P content	Temperature	1, 13	4.82	0.047	V. spiralis > E. nuttallii > P. lucens
		Species	2, 110	58.84	<0.001
		Temp.* Species	2, 110	17.33	<0.001
	C:N ratio	Temperature	1, 13	3.02	0.106	P. lucens = V. spiralis > E. nuttallii
		Species	2, 110	9.37	<0.001
		Temp.* Species	2, 110	4.32	0.016
	C:P ratio	Temperature	1, 13	7.14	0.019	P. lucens > E. nuttallii > V. spiralis
		Species	2, 110	68.50	<0.001
		Temp.* Species	2, 110	18.88	<0.001
	N:P ratio	Temperature	1, 13	0.99	0.338	P. lucens > E. nuttallii > V. spiralis
		Species	2, 110	116.01	<0.001
		Temp.* Species	2, 110	14.64	<0.001
	Total phenolics content	Temperature	1, 13	1.55	0.235	P. lucens > E. nuttallii = V. spiralis
		Species	2, 110	318.23	<0.001
		Temp.* Species	2, 110	9.23	<0.001
	N:Phenolics ratio	Temperature	1, 13	4.13	0.063	E. nuttallii = V. spiralis > P. lucens
		Species	2, 110	69.74	<0.001
		Temp.* Species	2, 110	6.51	0.002

Means comparison among species was done by a Tukey post-hoc test after each linear mixed-effect model test. Temp. indicates the factor temperature.

^aTIN means total dissolved inorganic nitrogen.

^bRCR means plant relative consumption rate. Bold numbers indicate a significance of p < 0.05.