Conditioning film and initial biofilm formation on electrochemical CaCO<inf>3</inf> deposition on a metallic net in the marine environment

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Journal Article
Biofouling, 2009, 25 (7), pp. 675 - 683
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Electrochemical deposition of minerals is a unique technology for artificial reef constructions, relying on calcium carbonate (CaCO3) build-up over metallic structures through electrolysis of seawater. The present study traces the first 72 h following electric current termination on bacterial biofilm build-up on a metallic net covered with CaCO3. 16S rRNA clone libraries indicated a dynamic succession. Proteobacteria and Bacteroidetes were evident at all sampling times while Cyanobacteria appeared only within the first 8 h. A significant increase in total organic carbon (TOC) and total protein was observed after 48 h with a significant correlation (R2 = 0.74), indicating TOC is a good tool for characterizing initial biofilm formation. 18S rRNA gene sequences obtained 72 h following current termination indicated a significant presence of Cnidarians (51%). Understanding the dynamics among primary bacterial settlers is important because they play a crucial role in driving the colonization of sessile invertebrate communities on artificial, as well as natural surfaces. © 2009 Taylor & Francis.
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