Fig. 2

Intestinal microbiota taxonomic structure. Bar chart representing the mean relative abundance of bacterial phyla (A) and families (B) in each one of the sampling groups (n = 5). Only the 15 most abundant phyla or families are represented. Different letters indicate significant differences among the groups (Kruskal–Wallis + Dunn’s post-test, P < 0.05). Taxa presenting significant differences are marked with an asterisk in the legend. U. stands for unchacterized. t1, t2, t3 stand for the different samplings performed at 2, 5 and 10 weeks post-exposure, respectively. W and S stand for the different trials performed in winter and summer, respectively. C and R stand for control and parasite-exposed fish, respectively