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Abundance and Bioactivity of Cultured Sponge-Associated Bacteria from the Mediterranean Sea

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Abstract

In this study, the search for new antibiotics was combined with quantitative ecological studies. The cultured fraction of the associated bacterial communities from ten different Mediterranean sponge species was investigated. To obtain quantitative and qualitative data of sponge-associated bacterial communities and to expand the cultured diversity, different media were used. The largest morphological diversity and highest yield of isolates was obtained by using oligotrophic media, which consisted of natural habitat seawater amended with (1% additional carbon sources. The dominant bacterial morphotypes were determined and bacterial isolates were tested for antimicrobial activity and identified using 16S rDNA sequencing. The sponge-associated most abundant morphotypes were all affiliated to the Alphaproteobacteria and showed antimicrobial activity against at least one of the tested strains. In contrast, the ambient seawater was dominated by Gammaproteobacteria. One single alphaproteobacterium, which was related to Pseudovibrio denitrificans, was shown to dominate the cultured community of at least six of the sponges. This designated MBIC3368-like alphaproteobacterium has been isolated from sponges before and seems to be restricted to associations with members of the phylum Porifera. It displays a weak and unstable antimicrobial activity, which gets easily lost during cultivation. However, this bioactive bacterium was present in the sponges by up to 106 cells per gram wet-weight sponge tissue and dominated the cultured fraction with up to 74%. The association of this alphaproteobacterium with sponges is probably evolutionary young and facultative and possibly involves biologically active secondary metabolites. Besides a demonstrated vertical transfer, additional horizontal transfer between the sponges is assumed. Members of the genus Bacillus displaying antimicrobial activity were found regularly, too. However, actinomycetes, which are known for their production of bioactive substances, were present in very low abundance.

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  1. Leibniz-Institut für Meereswissenschaften IFM-GEOMAR, Düsternbrooker Weg 20, 24105, Kiel, Germany

    Albrecht Muscholl-Silberhorn, Vera Thiel & Johannes F. Imhoff

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  1. Albrecht Muscholl-Silberhorn
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  2. Vera Thiel
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  3. Johannes F. Imhoff
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Correspondence to Johannes F. Imhoff.

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Muscholl-Silberhorn, A., Thiel, V. & Imhoff, J.F. Abundance and Bioactivity of Cultured Sponge-Associated Bacteria from the Mediterranean Sea. Microb Ecol 55, 94–106 (2008). https://doi.org/10.1007/s00248-007-9255-9

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