title: Pollution impacts on bacterioplankton diversity in a tropical urban coastal lagoon system.
abstract: Despite a great number of published studies addressing estuarine, freshwater and marine bacterial diversity, few have examined urban coastal lagoons in tropical habitats. There is an increasing interest in monitoring opportunistic pathogens as well as indigenous microbial community members in these water bodies by current molecular and microbiological approaches. In this work, bacterial isolates were obtained through selective plate dilution methods to evaluate antibiotic resistances. In addition, 16S rRNA gene libraries were prepared from environmental waters and mixed cultures grown in BHI medium inoculated with Jacarepaguá lagoon waters. Denaturing gradient gel electrophoresis (DGGE) analyses showed distinct community profiles between environmental communities from each studied site and their cultured counterparts. A total of 497 bacterial sequences were analyzed by MOTHUR, yielding 245 operational taxonomic units (OTUs) grouped at 97% similarity. CCA diagrams showcased how several environmental variables affect the distribution of 18 bacterial orders throughout the three distinct habitats. UniFrac metrics and Venn diagrams revealed that bacterial communities retrieved through each experimental approach were significantly different and that only one OTU, closely related to Vibrio cholerae, was shared between them. Potentially pathogenic bacteria were isolated from most sampled environments, fifty percent of which showed antibiotic resistance.
authors.affiliation: Laboratório de Microrganismos de Referência, Instituto Nacional de Controle de Qualidade em Saúde, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil.
authors.forename: Gigliola R B
authors.initials: GR
authors.lastname: Salloto
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Cardoso
authors.forename: Felipe H
authors.initials: FH
authors.lastname: Coutinho
authors.forename: Leonardo H
authors.initials: LH
authors.lastname: Pinto
authors.forename: Ricardo P
authors.initials: RP
authors.lastname: Vieira
authors.forename: Catia
authors.initials: C
authors.lastname: Chaia
authors.forename: Joyce L
authors.initials: JL
authors.lastname: Lima
authors.forename: Rodolpho M
authors.initials: RM
authors.lastname: Albano
authors.forename: Orlando B
authors.initials: OB
authors.lastname: Martins
authors.forename: Maysa M
authors.initials: MM
authors.lastname: Clementino
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000145:classification / Q000187:drug effects / Q000235:genetics*; D044822:Biodiversity; D001938:Brazil; D002947:Cities; D058645:Denaturing Gradient Gel Electrophoresis; D004777:Environment; D015723:Gene Library; D005843:Geography; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D010802:Phylogeny; D010933:Plankton / Q000145:classification / Q000187:drug effects / Q000235:genetics*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D014329:Tropical Climate; D014867:Water / Q000737:chemistry; D014871:Water Microbiology; D014876:Water Pollution / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D012336:RNA, Ribosomal, 16S; D014867:Water