Fig. 1: Sedimentary habitats affect microbiome structure and assembly.

a Representative images of sample collection indicating GFS and adjacent epilithic biofilm (left) with images of epilithic biofilms (right). Photo credits: Martina Schön and Matteo Tolosano. Ordination analyses of the epipsammic (n = 27 biologically independent samples) and epilithic (n = 21 biologically independent samples) biofilm based on prokaryote (b) and eukaryote (c) metabarcoding profiles from Southern Alps and Caucasus. Microbial richness across geographic locations and sample types in (d) prokaryotes and (e) eukaryotes. The statistical analyses was performed on 27 epipsammic and 21 epilithic samples using a two-sided non-parametric t test. Bonferroni-corrected p values are indicated by *, i.e., *** represents p < 0.001. Boxplots represent the median richness with the 25th and 75th quartiles observed within the samples.