SciELO - Scientific Electronic Library Online

vol.47 issue1Embryonic development, larval morphology and juvenile growth of the sea cucumber Athyonidium chilensis (Holothuroidea: Dendrochirotida)Structural characteristics of mangrove forests in Brazilian estuaries: A comparative study author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista de biología marina y oceanografía

On-line version ISSN 0718-1957


GOECKE, Franz; LABES, Antje; WIESE, Jutta  and  IMHOFF, Johannes F. Dual effect of macroalgal extracts on growth of bacteria in Western Baltic Sea. Rev. biol. mar. oceanogr. [online]. 2012, vol.47, n.1, pp.75-86. ISSN 0718-1957.

It is assumed that the biological characteristics of the bacterial strains used in bioactivity tests have strong influences on their susceptibility against antibacterial compounds. Therefore, the selection of bacterial test strains may rush conclusions on the effect of macroalgal extracts and metabolites on bacteria. To proof this assumption, we have analysed the biological activities of crude extracts of 16 macroalgae from the coastal waters of Kiel Fjord (Germany), and tested their effect against a panel of 10 microorganisms comprising 5 standard test strains of bacteria and 5 macroalga-associated bacteria. Fourteen macroalgae (88%) displayed antibacterial activity against at least one of the test strains. Despite the high proportion of extracts exhibiting antimicrobial activity, only 3 strains of the standard set were susceptible to macroalgal extracts and the overall activities were low (less than 80% of inhibition). Most of active extracts inhibited Bacillus subtilis, while no inhibition effects were found against Erwinia amylovora, Escherichia coli, and the macroalga-associated bacteria. In contrast, all extracts produced stimulatory growth effects of at least two of the tested bacteria. While growth stimulation of standard set of bacteria was rare (22.5% of total tests) with exception of plant pathogen Erwinia amylovora and two cases of Staphylococcus lentus, it was common among bacteria associated with macroalgae (77.5%), especially Bacillus algicola, Pseudomonas marincola and both algal-pathogenic bacteria. This study demonstrates that macroalgal extracts can display different effects, i.e., inhibition or stimulation of bacterial growth depending on the origin of the test strains, which are derived from a standard panel or from the marine environment, respectively.

Keywords : Marine algae; antibacterial activities; stimulation of bacterial growth; Kiel fjord.

        · abstract in Spanish     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License