Table 1 Partial tests in RDA of relationships between individual traits and OTU composition (in rows), and ecological parameters (elevation and habitat with elevation as a covariate).

Factor		Evol%	Elevation			Habitat
Factor		Evol%	AH	PC	%Ecol	AH	PC	%Ecol
Traits	All	14.7	0.016	0.010	9.5	ns	ns	14.2
	DSE	54.1	ns	ns	0.2	ns	ns	3.0
	AM	20.7	0.086	ns	2.6	0.008	0.014	9.3
	Fructan	73.2	ns	ns	0.6	ns	ns	0.4
	LCC	70.8	ns	ns	0.1	0.091	ns	0.5
	LNC	43.8	0.046	ns	0.7	ns	ns	0.8
	LPC	35.5	0.017	0.005	6.9	0.083	ns	0.1
	RNC	62.6	0.001	0.002	5.0	0.001	ns	2.0
	RPC	47.3	0.001	ns	1.9	0.006	ns	0.9
	Starch	99.1	ns	0.001	0.3	ns	ns	0.0
	FreeSug	42.8	ns	ns	0.6	ns	ns	1.4
	VF	77.5	0.001	0.001	4.2	0.001	0.075	1.7
	d13C	86.3	ns	ns	0.5	ns	ns	0.6
	d15N	35.3	ns	ns	0.7	0.006	0.093	7.6
OTU		23.1	0.038	0.034	9.2	0.039	ns	6.9

AH headed columns refer to ahistorical comparisons (i.e. without phylogenetic corrections), while PC headed columns refer to models with a correction for phylogenetic relatedness. Individual cells in AH and PC columns show Type I error probability estimates (adjusted by Bonferroni correction within test families) or ns when adjusted p ≥ 0.1. The percentage of trait variation explained by phylogenetic relatedness (Evol) between the species, and by the ecological factors (Ecol – either for Elevation or Habitat) in the phylogeny-corrected analyses, are shown. AMF – intensity of AMF colonization, DSE – intensity of DSE colonization, LCC - leaf carbon contents, LNC - leaf nitrogen contents, LPC - leaf phosphorus contents, RPC - root phosphorus contents, RNC - root nitrogen contents, d13C - leaf δ¹³C content, d15N - leaf δ¹⁵N content.

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