Fig. 2

Changes in the composition of gut bacterial communities after 28 days of exposure. a, b PCoA using the weighted (a) or unweighted (b) UniFrac distances on fish gut bacterial community in the five treatments. c Relative abundance of bacterial phyla across treatments. d Relative abundance of Firmicutes members (family level). Firmicutes are mainly represented by the Erysipelotrichaceae family, and a single ASV (ASV1662). Colored horizontal bars represent the different treatments (see Fig. 1). e Significant ASVs from the linear discriminant analysis (LDA) effect size (LEfSe) with a LDA score above 3.5, and their relative abundances across d28 treatments. The colored boxes on the y-axis represent the treatment where each ASV is most abundant; dots represent the average relative abundance; line spreads over the range of observed values. Only dominant ASVs, i.e., representing at least 10% of reads in at least one sample were further considered