![]() ![]() spinosulus displaying higher bacterial community diversity and distinctiveness than I. Our results confirm the hypothesized host-specific composition of bacterial communities between phylogenetically and spatially close sponge species in the Irciniidae family, with S. spinosulus was placed in an uncultured sponge-specific phylogenetic cluster with a close relationship to the genus Rhodovulum. One Alphaproteobacteria band specific to S. spinosulus fingerprints affiliated with one sponge-specific phylogenetic cluster in the phylum Chloroflexi and with sponge-derived sequences in the order Chromatiales ( Gammaproteobacteria), respectively. Two PCR-DGGE bands present exclusively in S. variabilis, and one present in both sponge species, affiliated with an uncultured sponge-specific phylogenetic cluster in the order Acidimicrobiales ( Actinobacteria). variabilis differed markedly from each other – with higher number of ribotypes observed in S. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) profiles of S. variabilis and that prokaryotic abundance in both species was about 4 orders of magnitude higher than in seawater. spinosulus hosted significantly more prokaryotic cells than I. ![]() Epifluorescence microscopy revealed that S. We address bacterial abundance and diversity of two temperate marine sponges belonging to the Irciniidae family - Sarcotragus spinosulus and Ircinia variabilis – in the Northeast Atlantic. Nevertheless, our understanding of this microbiota remains limited to a few host species found in restricted geographical localities, and the extent to which the sponge host determines the composition of its own microbiome remains a matter of debate. Recent studies have unravelled the diversity of sponge-associated bacteria that may play essential roles in sponge health and metabolism. ![]()
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