PERMANOVA main tests of bacterial community composition based on Bray-Curtis dissimilarities of OTUs (16S ribosomal amplicon pyrosequencing; ‘no dilution’ and ‘serial dilution’).

1Significant results (p (perm)<0.05) are highlighted in bold.
Displayed are tests for the factors ‘season’, ‘dilution’, ‘pH’ and their interactions and the partitioning of multivariate variation for ’no dilution’ and ‘serial dilution’ treatments. p-values were obtained using type III sums of squares and 999 permutations under the full model. d.f.: degrees of freedom, SS: sums of squares, Sq. root: square root of the component of variation attributable to that factor in the model, in units of Bray-Curtis dissimilarities.