Table 3.

Estimates from general linear models on OTU richness.

Coefficient	Overall richness	Burkholderiaceae	Acidobacteriaceae	Acetobacteraceae
Control-Vc	0.896‡	12.8	9.34	0.754
Control-Tv	0.831‡	14.3	-4.67	−2.61
Control-Hf	0.776‡	13.6	10.5	3.85
Vc-Tv	0.928‡	1.44	-14.0	−3.36
Vc-Hf	0.866‡	0.814	1.21	3.10
Tv-Hf	0.933‡	−0.627	15.2	6.46
Bagley–Garth	0.933‡	−17.7	−0.725	7.16
Bagley–Tintern	1.118‡	−10.7	3.52	6.04
Bagley–Usk	0.801‡	−10.4	−2.73	4.66
Bagley–Whitestone	1.0978‡	−15.1	−3.19	3.74
Bagley–Wytham	0.967‡	−9.89	4.03	8.01
Garth–Tintern	1.199‡	7.00	4.24	−1.12
Garth–Usk	0.859‡	7.27	−2.01	−2.51
Garth–Whitestone	1.177‡	2.52	−2.47	−3.42
Garth–Wytham	1.0371‡	7.75	4.76	0.846
Tintern–Usk	0.716‡	0.275	−6.25	−1.39
Tintern–Whitestone	0.982‡	−4.48	6.71	−2.30
Tintern–Wytham	0.865‡	0.758	0.516	1.97
Usk–Whitestone	1.371‡	−4.75	−0.462	−0.911
Usk–Wytham	1.208‡	0.483	6.76	3.35
Whitestone–Wytham	0.881‡	5.23	7.23	4.27
Wood pH	1.395‡	−16.8	−11.3	−4.52
Soil pH	1.0981‡	−3.60	−5.67	−4.51
Sequencing depth	1.0000176‡	0.000526	0.000495	0.000312

For the overall richness model, estimates were obtained by backtransforming coefficients from the model (marked ‡). Values represent the ratios of geometric means when moving between levels (categorical predictors, i.e. Vc has 89.6% richness of the control) or for a one unit increase in the predictor (continuous predictors, i.e. a one-unit increase in wood pH corresponds to a 39.5% increase in OTUs). The individual family models did not require transformation, so each estimate simply represents the average increase in OTU numbers between levels (categorical predictors) or the average increase in OTU numbers for a one-unit increase in the predictor (continuous predictors). All numbers are given to three significant figures. Abbreviations are control (C), Vulleminia comedens (Vc), Trametes versicolor (Tv), Hypholoma fasciculare (Hf).