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Production of inhibitory substances among bacterial biofilms on marine substrates. A study was made of antagonistic relations among benthic bacteria that form biofilms in different marine substrates. A total of 29 strains isolated from the seaweed Lessonia nigrescens and artificial substrates used for scallop Argopecten purpuratus , and abalone Haliotis discus hannai larval settlement were examined for antagonistic activity against other bacteria isolated from the same substrates.

Antibiosis assays of all isolates were carried out against a bacterium known to produce inhibitory substances Vibrio C The results confirmed the occurrence of antagonistic interactions among microorganisms isolated from microbiota attached to the marine surfaces In the inhibition tests, auto-inhibition activity among the selected morphotypes was not detected.

Inhibitory activity among the bacteria isolated from scallop collectors was observed only with one Vibrio sp. Evaluating the effect of strain Vibrio C33 against the 29 isolates, we detected a prominent antibacterial effect against Inhibitory effects were not detected in antibiosis assays done on strains isolated from seaweed and abalone collectors.

Results indicate that production of inhibitory substances is a common phenomenon among bacteria isolated from bacterial biofilms, giving them a competitive advantage over other bacteria and playing an important controlling function in epiphytic microhabitats. Key words : antagonism, biofilm, marine bacteria.

En el caso de comunidades microbianas adheridas a substratos naturales y artificiales, Armstrong et al. Aislamiento de bacterias. Bioensayos de la capacidad inhibitoria de las bacterias seleccionadas. Tabla 1. Strains used in this study, isolated from seaweed and artificial substrates used for scallop and abalone larval settlement. Tabla 2. Factorial matrix design for bacterial inhibition tests. Esto difiere con los resultados reportados por Lemos et al. El espectro de actividad inhibitoria es alto y se manifiesta en halos de entre 10 a 12 mm.

Tabla 3. Number and percentage of bacterial strains with inhibitory activity isolated from different artificial marine substrates. En general, los porcentajes de bacterias marinas productoras de substancias inhibitorias en macroalgas muestran valores fluctuantes dependiendo en gran parte del origen de las cepas. Lemos et al. Lodeiros et al. Boyd et al. Considerando que Vibrio C33 es una bacteria asociada a la microbiota nativa de A.

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Number and percentage of bacterial strains with inhibitory activity isolated from different artificial marine substrates En general, los porcentajes de bacterias marinas productoras de substancias inhibitorias en macroalgas muestran valores fluctuantes dependiendo en gran parte del origen de las cepas.








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