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Paint particles are a distinct and variable substrate for marine bacteria.

Alexander S Tagg1, Sonja Oberbeckmann1, Dieter Fischer2

  • 1Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock 18119, Germany.

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|August 21, 2019
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Summary

This study reveals unique microbial communities on paint microplastics. Certain paint biofilms are dominated by specific sulphate-reducing bacteria, offering new insights into microplastic-microbiological interactions.

Keywords:
16SBiofilmDesulfatitalea tepidiphiliaDesulfobacteraceaeMicroplasticSediment

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Area of Science:

  • Environmental microbiology
  • Marine science
  • Microplastic research

Background:

  • Paint particles are a significant, yet understudied, component of microplastics.
  • Microplastic-microbiological interactions, especially on paint particles, require further investigation.

Purpose of the Study:

  • To characterize biofilm communities on various paint microplastics from brackish sediment.
  • To compare paint-associated biofilms with those on natural and other synthetic particles.

Main Methods:

  • 16S rRNA gene sequencing was employed to analyze biofilm composition.
  • Surface chemistry of paint particles was analyzed using ATR FT-IR spectroscopy, Raman spectroscopy, and SEM-EDX.

Main Results:

  • Paint particle biofilm communities are distinct from natural, cellulose, and common microplastic biofilms.
  • A specific sulphate-reducing bacterium, *Desulfatitalea tepidiphilia* (Desulfobacteraceae), dominated four out of eight investigated paint biofilms.
  • The drivers for this dominance based on paint surface chemistry remain unclear.

Conclusions:

  • This is the first study to analyze microplastic-paint biofilm communities.
  • Paint microplastics harbor unique microbial communities, with potential implications for understanding microplastic fate and impact.
  • Further research is needed to elucidate the surface chemistry drivers influencing these specific microbial associations.