Bacteria of the genus Endozoicomonas dominate the microbiome of the Mediterranean gorgonian coral Eunicella cavolini

Abstract

Forming dense beds that provide the structural basis of a distinct ecosystem, the gor- gonian Eunicella cavolini (Octocorallia) is an important species in the Mediterranean Sea. Despite the importance and prevalence of this temperate gorgonian, little is known about its microbial assemblage, although bacteria are well known to be important to hard and soft coral functioning. Here, we used massively parallel pyrosequencing of 16S rRNA genes to determine the composi- tion and relative abundances of bacteria associated with E. cavolini collected from different depths at a site on the French Mediterranean coast. We found that whereas the bacterial assem- blages of E. cavolini were distinct and less diverse than those of the surrounding water column, the water depth did not affect the bacterial assemblages of this gorgonian. Our data show that E. cavolini's microbiome contains only a few shared species and that it is highly dominated by bac- teria from the genus Endozoicomonas, a Gammaproteobacteria that is frequently found to associ- ate with marine invertebrates.