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Spatial covariation of microbial community composition and polycyclic aromatic hydrocarbon concentration in a creosote-polluted soil

Author:
  • Niklas Törneman
  • Xiuhong Yang
  • Erland Bååth
  • Göran Bengtsson
Publishing year: 2008
Language: English
Pages: 1039-1046
Publication/Series: Environmental Toxicology and Chemistry
Volume: 27
Issue: 5
Document type: Journal article
Publisher: SETAC and Alliance Communications Group

Abstract english

Little is known about the spatial connection between soil microbial community composition and polycyclic aromatic hydrocarbon (PAH) concentration. A spatially explicit survey at a creosote-contaminated site demonstrated that microbial biomass (total concentration of phospholipid fatty acids [PLFAs]) and microbial community composition (PLFA fingerprints) were spatially autocorrelated, mostly within a distance of 25 m, and covaried with PAH concentrations. The concentration of PLFAs indicative of gram-negative bacteria (16:1 omega 7c, 16:1 omega 7t, 18:1 omega 7, cy17:0, and cy19:0) increased in the PAH hot spots, whereas PLFAs representing fungi and gram-positive bacteria (including actinomycetes) were negatively correlated to PAH concentrations. Most PLFAs were spatially autocorrelated, with distances varying between 4 and 25 m. Those PLFAs that increased in PAH-contaminated soil had autocorrelation ranges between 4 and 16 m, whereas the fungal indicator PLEA 18:2 omega 6,9 had the largest autocorrelation range (25 in). Bacterial strains isolated using a spray-plate technique and with the same PLFA composition as that in contaminated soil samples were capable of degrading phenanthrene, fluoranthene, and pyrene, indicating that the main PAH degraders could be isolated.

Keywords

  • Ecology
  • Biological Sciences
  • autocorrelation
  • aromatic hydrocarbon degraders
  • polycyclic
  • geostatistics
  • phospholipid fatty acids
  • heterogeneity

Other

Published
  • Microbial Ecology
  • ISSN: 0730-7268
Erland Bååth
E-mail: erland [dot] baath [at] biol [dot] lu [dot] se

Professor emeritus

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