Fig. 1

Structure of the symbiotic community in the major gut compartments of L. labralis analysed by 16S rRNA gene amplicon high-throughput sequencing. A Schematic of the L. labralis digestive tract with the site of the cutting between the different compartments indicated with a dashed line. B Richness (number of observed OTUs inferred using a sobs calculator) and diversity (inferred using the inverse of the Simpson diversity estimator) of bacterial communities in the different hindgut compartments. C Venn diagram of shared and unique OTUs in the different sections of the hindgut (P1-P5). Relative community abundance in different gut sections at the phylum (D) and class (E) levels