title: Description of new filamentous toxic Cyanobacteria (Oscillatoriales) colonizing the sulfidic periphyton mat in marine mangroves.
abstract: In this multidisciplinary study, we combined morphological, physiological, and phylogenetic approaches to identify three dominant water bloom-forming Cyanobacteria in a tropical marine mangrove in Guadeloupe (French West Indies). Phylogenetic analysis based on 16S rRNA gene sequences place these marine Cyanobacteria in the genera Oscillatoria (Oscillatoria sp. clone gwada, strain OG) or Planktothricoides ('Candidatus Planktothricoides niger' strain OB and 'Candidatus Planktothricoides rosea' strain OP; both provisionally novel species within the genus Planktothricoides). Bioassays showed that 'Candidatus Planktothricoides niger' and 'Candidatus Planktothricoides rosea' are toxin-producing organisms. This is the first report of the characterization of Cyanobacteria colonizing periphyton mats of a tropical marine mangrove. We describe two novel benthic marine species and provide new insight into Oscillatoriaceae and their potential role in marine sulfide-rich environments such as mangroves.
authors.affiliation: Institut de Biologie Paris-Seine, C.N.R.S, Institut de Biologie Paris-Seine, Sorbonne Universités Paris VI, Paris, France; Equipe Biologie de la Mangrove, UMR 7138 - Evolution Paris-Seine, Paris, France.
authors.forename: Chantal
authors.initials: C
authors.lastname: Guidi-Rontani
authors.forename: Maïtena R N
authors.initials: MR
authors.lastname: Jean
authors.forename: Silvina
authors.initials: S
authors.lastname: Gonzalez-Rizzo
authors.forename: Susanne
authors.initials: S
authors.lastname: Bolte-Kluge
authors.forename: Olivier
authors.initials: O
authors.lastname: Gros
mesh_terms: D000458:Cyanobacteria / Q000166:cytology / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D004275:DNA, Ribosomal / Q000235:genetics; D020459:Genes, rRNA; D019430:Guadeloupe; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D014871:Water Microbiology; D053833:Wetlands
chemical_list: D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S
keywords: Oscillatoriales; marine mangrove; periphyton mats; phylogeny; toxicity