For the richness estimates, spatial autocorrelation was positive and highly significant (Moran’s I of 0.71 for AM and 0.64 for EcM), whereas spatial autocorrelation was low in model residuals for both fungal types (Moran’s I of 0.11 for AM and 0.23 for EcM; Supplementary Fig. 1 ), similar to a previous study that reported limited effects of geographical distance on fungal alpha diversity 39 .
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