title: Large scale distribution of bacterial communities in the upper Paraná River floodplain.
abstract: A bacterial community has a central role in nutrient cycle in aquatic habitats. Therefore, it is important to analyze how this community is distributed throughout different locations. Thirty-six different sites in the upper Paraná River floodplain were surveyed to determine the influence of environmental variable in bacterial community composition. The sites are classified as rivers, channels, and floodplain lakes connected or unconnected to the main river channel. The bacterial community structure was analyzed by fluorescent in situ hybridization (FISH) technique, based on frequency of the main domains Bacteria and Archaea, and subdivisions of the phylum Proteobacteria (Alpha-proteobacteria, Beta-proteobacteria, Gamma-proteobacteria) and the Cytophaga-Flavobacterium cluster. It has been demonstrated that the bacterial community differed in density and frequency of the studied groups. And these differences responded to distinct characteristics of the three main rivers of the floodplain as well as to the classification of the environments found in this floodplain. We conclude that dissimilarities in the bacterial community structure are related to environmental heterogeneity, and the limnological variables that most predicted bacterial communities in the upper Paraná River floodplain was total and ammoniacal nitrogen, orthophosphate and chlorophyll-a.
authors.affiliation: Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais Universidade Estadual de Maringá MaringáPR Brazil Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Josiane Barros
authors.initials: JB
authors.lastname: Chiaramonte
authors.affiliation: Programa de Pós Graduação em Ecologia de Ambientes Aquáticos Continentais Departamento de Biologia, Núcleo de Pesquisa em Limnologia Ictiologia e Aquicultura Universidade Estadual de Maringá MaringáPR Brazil Programa de Pós Graduação em Ecologia de Ambientes Aquáticos Continentais, Departamento de Biologia, Núcleo de Pesquisa em Limnologia Ictiologia e Aquicultura, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Maria do Carmo
authors.initials: Mdo C
authors.lastname: Roberto
authors.affiliation: Departamento Acadêmico de Química e Biologia Universidade Tecnológica Federal do Paraná CuritibaPR Brazil Departamento Acadêmico de Química e Biologia, Universidade Tecnológica Federal do Paraná, Curitiba, PR, Brazil.
authors.forename: Thomaz Aurélio
authors.initials: TA
authors.lastname: Pagioro
mesh_terms: D001105:Archaea / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D001419:Bacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D058448:Biota; D001938:Brazil; D017404:In Situ Hybridization, Fluorescence; D045483:Rivers; D014871:Water Microbiology
keywords: bacterioplankton distribution; floodplain; fluorescent in situ hybridization