Fig 3. Major bacterial genera in the gut microbiome of four freshwater mussel species (in order shown: Cyclonaias asperata, Fusconaia cerina, Lampsilis ornata, and Obovaria unicolor) at six sites in the Sipsey River, AL, USA, and for suspended seston collected from the same sites, as determined by Illumina 16S rRNA gene sequencing.

Stacked bar plots are arranged with the most abundant genus overall (Clostridium sensu stricto) at the top. No O. unicolor samples were found at site 1. The 24 most abundant genera are shown and represent 73% of all sequencing reads that were identified to the genus level. Sequences classified at the genus level made up 35.7% of the total data. All other bacterial genera are grouped together as “other”.