The diversity of 16S rRNA genes in the microbial community of endemic sponge Lubomirskia baicalensis with bleached patches of tissue was studied. Eight bacterial phyla were identified in the sponge microbiome: Cyanobacteria (27.3%; n = 36; 2 OTU, operational taxonomic unit), Proteobacteria (22.7%; n = 30; 5 OTU), Actinobacteria (16.7%; n = 22; 7 OTU), Verrucomicrobia (15.2%; n = 20; 4 OTU), Planctomycetes (9%; n = 12; 3 OTU), Bacteroidetes (4.5%; n = 6; 3 OTU), WS5 (3%; n = 4; 1 OTU), and TM7 (1.5%; n = 2; 1 OTU). The basic phyla typical for freshwater sponge microbiomes are present in the community. However, in contrast to previously studied L. baicalensis bacterial associations in the bleached sponge community, a dominance of Cyanobacteria and a low number of representatives of the Bacteroidetes and Betaproteobacteria were observed. Phylotypes exhibiting a high percentage of similarity with the microorganisms inhabiting substrates rich in organic matter were also found. Clearly, the bleaching processes of Baikal sponges affect the composition and the ratio of the major taxonomic groups of sponge-associated bacteria.
Russian Journal of Genetics – Springer Journals
Published: Nov 13, 2015
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