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Methods for Characterizing the Co-development of Biofilm and Habitat Heterogeneity
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Hyperbaric biofilms on engineering surfaces formed in the deep sea.

Alexandra Meier1, Nefeli-Maria Tsaloglou, Matthew C Mowlem

  • 1a National Oceanography Centre, University of Southampton , Southampton , UK .

Biofouling
|August 23, 2013
PubMed
Summary

Biofouling significantly impacts deep-sea sensors, with varied microbial communities colonizing different materials like glass, copper, and PMMA. Understanding these biofilms is crucial for long-term marine sensor deployment.

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Area of Science:

  • Marine Biology
  • Microbiology
  • Materials Science

Background:

  • Biofouling poses a significant challenge for the long-term operation of sensors in marine environments.
  • Understanding microbial colonization on artificial surfaces is essential for sensor reliability.

Purpose of the Study:

  • To investigate biofilm formation on various artificial materials deployed in the deep sea.
  • To characterize the microbial communities colonizing these materials using molecular analyses.

Main Methods:

  • Deployment of glass, copper, Delrin™, and poly-methyl methacrylate (PMMA) sensors at 4700m depth in the Cayman Trough for 10 days.
  • Quantification of biofilm surface coverage as an indicator of biomass.
  • Molecular analyses including Denaturing Gradient Gel Electrophoresis (DGGE) and sequence alignment to identify microbial communities.

Main Results:

  • Copper and PMMA exhibited the lowest biofilm coverage.
  • Bacterial dominance was observed on copper, Delrin™, and PMMA biofilms.
  • Archaea dominated glass surfaces simulating interior sensor conditions, while Eukarya were most abundant on exterior-simulating glass surfaces.
  • DGGE analysis revealed distinct microbial community structures for glass and PMMA, differing from copper and Delrin™.
  • Identified uncultivable microorganisms, with specific sequences linked to Cowellia sp. and Alterominidaceae (γ-proteobacteria).

Conclusions:

  • Deep-sea biofilm formation varies significantly across different materials.
  • Microbial community composition is material-dependent, influencing sensor performance.
  • Mitigation strategies are necessary for reliable long-term deep-sea sensor deployment.