Resumen de Phenotypic characterization of culturable marine luminous bacteria isolated from coastal waters of the southern Adriatic Sea (Otranto, Italy)

F Bagordo, F Serio, F Lugoli, T Grassi, A Idolo, G Gabutti, A. De Donno

• español

  Con el fin de determinar la abundancia y composición de especies de bacterias luminosas en aguas costeras del sur del marAdriático (Otranto, Italia), se recolectaron muestras en tres sitios con diferente grado de contaminación antropogénica. Se aislaron 116 cepas debacterias luminosas marinas y se sometieron a 36 pruebas bioquímicas para su caracterización fenotípica. El análisis numérico de los datosmostró cinco grupos con > 86% de similitud, los cuales fueron identificados como Photobacterium leiognathi, Vibrio fischeri, Vibrio harveyi,Vibrio splendidus biovar I y Shewanella hanedai. La abundancia relativa de cada especie muestra que las bacterias luminosas cultivables en lasaguas analizadas consisten principalmente de V. harveyi (69.0%), V. f i s c h e r i (13.8%) y P. leiognathi (12.1%). Además, la actividad humanaparece afectar la abundancia total de bacterias luminosas pero no la selección de especies individuales, ya que las frecuencias de las bacteriasfueron similares en todos los sitios estudiados.

• English

  To determine the abundance and species composition of luminous bacteria in the coastal waters of the southern Adriatic Sea(Otranto, Italy), samples were collected from three sites affected by different degrees of anthropogenic pollution. A total of 116 strains ofmarine luminous bacteria were isolated and subjected to phenotypic characterization, which included 36 biochemical tests. Numerical analysisof the data revealed five clusters with > 86% similarity, which were readily identified as Photobacterium leiognathi, Vibrio fischeri, Vi b r i oharveyi, Vibrio splendidus biovar I, and Shewanella hanedai. The relative abundance of each species shows that culturable luminous bacteria inthe monitored waters are composed mainly of V. h a r v e y i (69.0%), followed by V. f i s c h e r i (13.8%) and P. leiognathi (12.1%). In addition, humanactivity appears to affect the total abundance of luminous bacteria but not the selection of individual species, since the frequencies of thebacteria were similar at all examined sites