Fig. 3. Mesocosm experiments recapitulate the establishment of phycosphere communities by Cr across soil types and growth media.

a PCoA analysis of Bray–Curtis dissimilarities of bacterial community profiles (ASV-level), constrained by condition (17.9% of the variance; P < 0.001), showing a significant separation between start inocula (soil washes, depicted in brown; n = 12), phycosphere communities (green; n = 158), and soil washes incubated in minimal media (blue; n = 112), or media supplemented with artificial photoassimilates (APs, depicted in orange; n = 144). b Dynamic changes in the phycosphere community composition in terms of the aggregated relative abundances of ASVs enriched in each condition (n = 158) with respect to the start inocula (n = 12). Error bars represent the standard deviation of the data. Corresponds to experiment C (Supplementary Fig. 1c and Supplementary Table 1).