Abstract
To understand the functioning of sponges, knowledge of the structure of their associated microbial communities is necessary. However, our perception of sponge-associated microbiomes remains mainly restricted to marine ecosystems. Here, we report on the molecular diversity and composition of bacteria in the freshwater sponge Ephydatia fluviatilis inhabiting the artificial lake Vinkeveense Plassen, Utrecht, The Netherlands. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) fingerprints revealed that the apparent diversities within the domain Bacteria and the phylum Actinobacteria were lower in E. fluviatilis than in bulk water. Enrichment of specific PCR-DGGE bands in E. fluviatilis was detected. Furthermore, sponge- and bulk water-derived bacterial clone libraries differed with respect to bacterial community composition at the phylum level. E. fluviatilis-derived sequences were affiliated with six recognized phyla, i.e., Proteobacteria, Planctomycetes, Actinobacteria, Bacteroidetes, Chlamydiae and Verrucomicrobia, in order of relative abundance; next to the uncultured candidate phylum TM7 and one deeply rooted bacterial lineage of undefined taxonomy (BLUT). Actinobacteria, Proteobacteria, and Bacteroidetes were the dominant bacterial phyla in the freshwater clone library whereas sequences affiliated with Planctomycetes, Verrucomicrobia, Acidobacteria and Armatimonadetes were found at lower frequencies. Fine-tuned phylogenetic inference showed no or negligible overlaps between the E. fluviatilis and water-derived phylotypes within bacterial taxa such as Alphaproteobacteria, Bacteroidetes and Actinobacteria. We also ascertained the status of two alphaproteobacterial lineages as freshwater sponge-specific phylogenetic clusters, and report on high distinctiveness of other E. fluviatilis specific phylotypes, especially within the Bacteroidetes, Planctomycetes and Chlamydia taxa. This study supports the contention that the composition and diversity of bacteria in E. fluviatilis is partially driven by the host organism.
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Acknowledgements
R. Costa was supported by the Soil Biotechnology Foundation and by the Portuguese Foundation of Science and Technology (FCT). T. Keller-Costa received a research fellowship from the Federation of European Microbiological Societies (FEMS) to perform this work. We thank Dr. Joana B.T. Xavier for the identification of the sponge specimens collected in this study. We are grateful to the late Niels Cox and Albert Ellens for their assistance during sampling.
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Fig. S1
Location (arrow in a) and satellite image (b), and limnological parameters (c) of the Vinkeveense Plassen lake Utrecht, The Netherlands, measured on sampling day at 8 m depth. The arrow in b shows the E. fluviatilis sampling location (DOCX 589 kb)
Figure S2
Phylogenetic inference of Planctomycetes 16S rRNA gene sequences by Maximum Likelihood (ML), with sequences retrieved in this study highlighted in bold. Values in brackets give the number of clone sequences from this study, if more than one, in each tree leaf. Closest relatives to all E. fluviatilis and lake water sequences have been included in the analysis. Numbers at tree nodes are bootstrap values calculated in ML analysis, and values ≥70% are shown. Scale bar: number of nucleotide substitutions per site (GIF 51 kb)
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Costa, R., Keller-Costa, T., Gomes, N.C.M. et al. Evidence for Selective Bacterial Community Structuring in the Freshwater Sponge Ephydatia fluviatilis . Microb Ecol 65, 232–244 (2013). https://doi.org/10.1007/s00248-012-0102-2
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DOI: https://doi.org/10.1007/s00248-012-0102-2