Table 2 PERMANOVA results for phylogenetic oomycetes (a) and fungal pathogens (b).

From: Root pathogen diversity and composition varies with climate in undisturbed grasslands, but less so in anthropogenically disturbed grasslands

Subset of samples	Predictor variables	R² value	p value
(a) Oomycetes
All samples	Disturbance	0.061	0.000
	Mean annual precipitation	0.092	0.000
	Mean annual temperature	0.044	0.001
	Bray 2 phosphorus	0.054	0.000
	Potassium	0.035	0.007
	Calcium	0.029	0.023
	Soil pH	0.012	0.621
	Disturbance × Mean annual precipitation	0.038	0.003
	Disturbance × Mean annual temperature	0.019	0.188
	Disturbance × Bray 2 phosphorus	0.024	0.052
	Disturbance × Potassium	0.022	0.093
	Disturbance × Calcium	0.025	0.042
	Disturbance × Soil pH	0.020	0.153
	Sequence number	0.053	0.000
Remnant samples only	Mean annual precipitation	0.030	0.314
	Mean annual temperature	0.056	0.027
	Bray 2 phosphorus	0.048	0.050
	Potassium	0.037	0.137
	Calcium	0.050	0.043
	Soil pH	0.043	0.084
	Sequence number	0.052	0.030
	Mean annual precipitation × Temperature	0.023	0.879
Disturbed samples only	Mean annual precipitation	0.061	0.109
	Mean annual temperature	0.064	0.100
	Bray 2 phosphorus	0.062	0.109
	Potassium	0.060	0.122
	Calcium	0.066	0.090
	Soil pH	0.054	0.175
	Sequence number	0.044	0.309
	Mean annual precipitation × Temperature	0.048	0.203
(b) Fungal pathogens
All samples	Disturbance	0.065	0.000
	Mean annual precipitation	0.096	0.000
	Mean annual temperature	0.055	0.001
	Bray 2 phosphorus	0.050	0.002
	Potassium	0.056	0.001
	Calcium	0.011	0.671
	Soil pH	0.018	0.274
	Disturbance × Mean annual precipitation	0.028	0.057
	Disturbance × Mean annual temperature	0.016	0.344
	Disturbance × Bray 2 phosphorus	0.014	0.473
	Disturbance × Potassium	0.018	0.300
	Disturbance × Calcium	0.016	0.403
	Disturbance × Soil pH	0.035	0.017
	Sequence number	0.027	0.057
Remnant samples only	Mean annual precipitation	0.050	0.053
	Mean annual temperature	0.074	0.005
	Bray 2 phosphorus	0.073	0.006
	Potassium	0.056	0.029
	Calcium	0.067	0.011
	Soil pH	0.070	0.007
	Sequence number	0.023	0.463
	Mean annual precipitation × Temperature	0.049	0.042
Disturbed samples only	Mean annual precipitation	0.044	0.455
	Mean annual temperature	0.050	0.400
	Bray 2 phosphorus	0.049	0.406
	Potassium	0.046	0.432
	Calcium	0.052	0.379
	Soil pH	0.045	0.444
	Sequence number	0.056	0.272
	Mean annual precipitation × Temperature	0.099	0.028
(c) Fungal saprotrophs
All samples	Disturbance	0.099	0.000
	Mean annual precipitation	0.169	0.000
	Mean annual temperature	0.053	0.000
	Bray 2 phosphorus	0.081	0.000
	Potassium	0.033	0.006
	Calcium	0.035	0.003
	Soil pH	0.022	0.066
	Disturbance × Mean annual precipitation	0.016	0.195
	Disturbance × Mean annual temperature	0.014	0.270
	Disturbance × Bray 2 phosphorus	0.021	0.067
	Disturbance × Potassium	0.010	0.536
	Disturbance × Calcium	0.015	0.265
	Disturbance × Soil pH	0.020	0.087
	Sequence number	0.012	0.439
Remnant samples only	Mean annual precipitation	0.023	0.329
	Mean annual temperature	0.052	0.013
	Bray 2 phosphorus	0.050	0.015
	Potassium	0.033	0.097
	Calcium	0.052	0.012
	Soil pH	0.047	0.021
	Sequence number	0.026	0.219
	Mean annual precipitation × Temperature	0.025	0.238
Disturbed samples only	Mean annual precipitation	0.039	0.404
	Mean annual temperature	0.037	0.479
	Bray 2 phosphorus	0.037	0.470
	Potassium	0.040	0.402
	Calcium	0.031	0.597
	Soil pH	0.048	0.210
	Sequence number	0.036	0.415
	Mean annual precipitation × Temperature	0.039	0.340

Separate tests were run within each oomycetes (a), fungal pathogens (b) and fungal saprotrophs (c) for all, remnant and disturbed sites; a second set of analyses was run for remnant and disturbed sites to test for the interaction between temperature and precipitation. All significant predictors are in bold.

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Table 2 PERMANOVA results for phylogenetic oomycetes (a) and fungal pathogens (b).

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