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Community dynamics and functional characteristics of naphthalene‐degrading populations in contaminated surface sediments and hypoxic/anoxic groundwater

Journal Article · · Environmental Microbiology
 [1];  [2];  [3];  [4]
  1. Soil and Crop Sciences, School of Integrative Plant Science Cornell University Ithaca NY 14853 USA
  2. Department of Microbiology and Ecosystem Science University of Vienna Vienna Austria
  3. Cornell SIMS Laboratory, Department of Earth and Atmospheric Sciences Cornell University Ithaca NY 14853 USA
  4. Department of Microbiology Cornell University Ithaca NY 14853 USA
Summary

Earlier research on the biogeochemical factors affecting natural attenuation in coal‐tar contaminated groundwater, at South Glens Falls, NY, revealed the importance of anaerobic metabolism and trophic interactions between degrader and bacterivore populations. Field‐based characterizations of both phenomena have proven challenging, but advances in stable isotope probing (SIP), single‐cell imaging and shotgun metagenomics now provide cultivation‐independent tools for their study. We tracked carbon from 13 C‐labelled naphthalene through microbial populations in contaminated surface sediments over 6 days using respiration assays, secondary ion mass spectrometry imaging and shotgun metagenomics to disentangle the contaminant‐based trophic web. Contaminant‐exposed communities in hypoxic/anoxic groundwater were contrasted with those from oxic surface sediments to identify putative features of anaerobic catabolism of naphthalene. In total, six bacteria were responsible for naphthalene degradation. Cupriavidus , Ralstonia and Sphingomonas predominated at the earliest stages of SIP incubations and were succeeded in later stages by Stenotrophomonas and Rhodococcus. Metagenome‐assembled genomes provided evidence for the ecological and functional characteristics underlying these temporal shifts. Identical species of Stenotrophomonas and Rhodococcus were abundant in the most contaminated, anoxic groundwater. Apparent increases in bacterivorous protozoa were observed following exposure to naphthalene, though insignificant amounts of carbon were transferred between bacterial degraders and populations of secondary feeders.

Sponsoring Organization:
USDOE
OSTI ID:
1467755
Journal Information:
Environmental Microbiology, Journal Name: Environmental Microbiology Journal Issue: 10 Vol. 20; ISSN 1462-2912
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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