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Fig. 6 | Environmental Microbiome

Fig. 6

From: Landscape scale ecology of Tetracladium spp. fungal root endophytes

Fig. 6

Drivers of the combined mean relative abundance of the two OTUs. Path diagram of the piecewise structural equation model (PSEM) showing direct and indirect effects with standard estimates R2 values for linear correlations and R2 conditional values for mixed effects linear correlations. The R2 marginal values for nutrients, pH, soil structure, climate, and rotation are: 0.35, 0.20, 0.03, 0.01, 0.03. Dotted lines indicate non-significance in the path model. Arrow sizes indicate effect size whereas arrow colours indicate a positive or a negative relationship (red—positive, blue—negative). The multivariate PSEM linking soil structure, pH, rotation, climate, and soil nutrients with mean relative abundance of OTUs 19 and 1088 was well supported by the data (Fisher's C = 36.86, P =  < 0.001, degrees of freedom = 10). *p < 0.05; **p < 0.01; ***p < 0.001. Standardised effect size is shown from the linear mixed effects models where soil compartment and sampled location were used as random effect. Model fit indicators for the LMMs are shown in Additional file 2. Rotation values are reciprocal

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