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Figure S1. Average distances to centroid for each dispersal mode group and the whole community data.

Figure S2. Environmental heterogeneity in the three study areas.

Table S1. Total numbers of taxa and proportion of singletons in each dispersal mode group and in each basin.

Table S2. A list of taxa detected in the field surveys (with frequency of occupancy and mean abundance). The taxa are grouped by study region and dispersal mode group.

Table S3. Number of species and information content within each dataset.

Table S4. Adjusted R2 values and p-values for environmental [a+b] and spatial [b+c] models.

Table S5. Pure environmental and pure spatial fractions for observed data, as well as when information content was taken into account (based on overland distances).

Table S6. Pure environmental and pure spatial fractions for observed data and when information content was taken into account (based on watercourse distances).

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