Description of freshwater bacterial assemblages from the Upper Paraná River floodpulse system, Brazil
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Michael J. Lemke [1] ; E. Kurt Lienau [2] ; Jean Rothe ; Thomaz A. Pagioro [3] ; Jeff Rosenfeld ; Rob DeSalle
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[1] University of Illinois at Springfield
University of Illinois at Springfield
Township of Capital, Estados Unidos
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[2] New York University
New York University
Estados Unidos
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[3] Universidade Tecnológica Federal do Paraná
Universidade Tecnológica Federal do Paraná
Brasil
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- Localización: Microbial ecology, ISSN-e 1432-184X, ISSN 0095-3628, Vol. 57, Nº. 1, 2009, págs. 94-103
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Bacteria were identified from a large, seasonally flooded river (Paraná River, Brazil) and two floodplain habitats that were part of the same river system yet very different in nature: clearwater Garças Lagoon and the highly humic waters of Patos Lagoon. Bacterioplankton were collected during mid-summer (Jan. 2002) from water samples (2 l) filtered first through a 1.2-μm filter then a 0.2-μm membrane filter representing the particle-attached and free-living sub-communities, respectively. DNA was extracted from filters and purified and a 16S rRNA clone library established for each habitat. Over 300 clones were sequenced and checked for similarity to existing 16S sequences in GenBank using the BLAST algorithm with default parameters. Further classification of clones was done using a species “backbone” attachment followed by parsimony analysis. The majority (85%) of sequences, referred to here as operational taxonomic units (OTUs), were most similar to uncultured bacterium 16S sequences. OTUs from each Proteobacteria sub-phylum (α, β, γ, δ, ɛ) were present in the Upper Paraná River system, as well as members of the Bacteroidetes. The microbial assemblage from Patos Lagoon was least like other samples in that it had no Firmicutes present and was dominated by Actinobacteria. Verrucomicrobia OTUs were only found in the free-living assemblage. This study documents the presence of globally distributed phyla in Upper Paraná River and taxa unique to habitat and particle attachment.
