Breakdown of average Bray-Curtis dissimilarities (untransformed data) indicating the contributions of different taxa to 90% of the average between-group dissimilarity for each studied type of variation.

–δ = average contribution of taxon i to between-group dissimilarities; –δ% = average percentage contribution of taxon i; Σ–δ% = cumulative average percentage contribution at the level of taxon i. The contribution of each taxon was averaged across all between-group pairwise comparisons.