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Appendix S1.Alignments and phylogenetic trees in NEXUS format. Environmental parameters and PCA axes.

Fig. S1. Accumulation curves for bacterial SSU rDNA sequences in biofilms from different geographic areas. The accumulation curves have been done at different SSU rDNA similarity cut-off values.

Fig. S2. Accumulation curves for eukaryotic SSU rDNA sequences in biofilms from different geographic areas. The accumulation curves have been done at different SSU rDNA similarity cut-off values.

Fig. S3. Species (OTU) rank–abundance distributions expressed as the cumulative frequencies.

Fig. S4. Phylogenetic tree of SSU rDNA sequences of Acidobacteria and Bacteroidetes identified in epilithic biofilms.

Fig. S5. Phylogenetic tree of proteobacterial SSU rDNA sequences identified in sunlight-exposed biofilms growing on mineral substrates.

Fig. S6. Principal component analysis (PCA) on the 18 environmental variables used to explain community compositions.

Table S1. Relationship between the NMDS and the environmental descriptors.

Table S2. Computational procedure for the partitioning model using constrained correspondence analyses with covariables.

FilenameFormatSizeDescription
MEC_5659_sm_Alignments.NEX767KSupporting info item
MEC_5659_sm_Phylogenetic-trees.NWC80KSupporting info item
MEC_5659_sm_Raw-environmental-data-PCA-axes.xls36KSupporting info item
MEC_5659_sm_Readme.txt1KSupporting info item
MEC_5659_sm_TableS1-S2-FigS1-S6.pdf1679KSupporting info item

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