Fig. 3

Gut microbiota structure and diversity of D. vulgaris investigated across a large geographic range in the NW Mediterranean Sea (Large-scale dataset). A Principal Component Analysis ordination representing the gut bacterial communities of specimens from the three geographic regions (BA, CR and BO). The distances were obtained by calculating the Aitchinson’s distances on the centered log-ratio (CLR) transformed abundances of the ASV (not agglomerated at higher taxonomical levels). B Stacked barplot representing the relative abundances of the core bacterial genera characterizing the gut microbiota of D. vulgaris in the NW Mediterranean Sea. Only the bacterial genera occurring in more than 75% of the individuals and representing more than 0.01% of their community were included in the core microbiota. C Boxplot of the Shannon alpha diversity index (at the ASV level) compared between the three different regions