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Phenanthrene degradation by estuarine surface microlayer and bulk water microbial populations

Abstract

Paired surface microlayer and bulk water samples from five sites in the Great Bay Estuary, New Hampshire, were examined with regard to numbers of bacteria,14C-phenanthrene biodegradation potentials, and organic and inorganic chemical characteristics. Microlayer samples were generally enriched in nutrients (N and P), dissolved organic matter, and culturable heterotrophic bacteria compared with their corresponding bulk waters. Microlayer samples from marina environments were also enriched in aromatic hydrocarbons, as determined by UV spectrophotometric and fluorometric analyses, and demonstrated substantial phenanthrene biodegradation activity in the assay employed. Biodegradation activity of marina bulk water samples ranged from nil to levels exceeding those exhibited by microlayer samples. No diminution of biodegradation activity was observed after filtration (1.2 μm effective retention) of microlayer water, indicating that the responsible organisms were not particle-associated. Phenanthrene-degrading bacteria, enumerated by counting clearing zones in a crystalline phenanthrene overlay after colony development on a phenanthrene/toluene agar (PTA) medium, were superior to epifluorescence direct counts or standard plate counts on PTA or estuarine nutrient agar in predicting14C-phenanthrene biodegradative activity.

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Guerin, W.F. Phenanthrene degradation by estuarine surface microlayer and bulk water microbial populations. Microb Ecol 17, 89–104 (1989). https://doi.org/10.1007/BF02025596

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Keywords

  • Phenanthrene
  • Dissolve Organic Matter
  • Bulk Water
  • Surface Microlayer
  • Standard Plate Count