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Public and Environmental Health Microbiology

Temporal Stability of the Microbial Community in Sewage-Polluted Seawater Exposed to Natural Sunlight Cycles and Marine Microbiota

Lauren M. Sassoubre, Kevan M. Yamahara, Alexandria B. Boehm
H. L. Drake, Editor
Lauren M. Sassoubre
Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA
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Kevan M. Yamahara
Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA
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Alexandria B. Boehm
Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA
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H. L. Drake
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DOI: 10.1128/AEM.03950-14
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ABSTRACT

Billions of gallons of untreated wastewater enter the coastal ocean each year. Once sewage microorganisms are in the marine environment, they are exposed to environmental stressors, such as sunlight and predation. Previous research has investigated the fate of individual sewage microorganisms in seawater but not the entire sewage microbial community. The present study used next-generation sequencing (NGS) to examine how the microbial community in sewage-impacted seawater changes over 48 h when exposed to natural sunlight cycles and marine microbiota. We compared the results from microcosms composed of unfiltered seawater (containing naturally occurring marine microbiota) and filtered seawater (containing no marine microbiota) to investigate the effect of marine microbiota. We also compared the results from microcosms that were exposed to natural sunlight cycles with those from microcosms kept in the dark to investigate the effect of sunlight. The microbial community composition and the relative abundance of operational taxonomic units (OTUs) changed over 48 h in all microcosms. Exposure to sunlight had a significant effect on both community composition and OTU abundance. The effect of marine microbiota, however, was minimal. The proportion of sewage-derived microorganisms present in the microcosms decreased rapidly within 48 h, and the decrease was the most pronounced in the presence of both sunlight and marine microbiota, where the proportion decreased from 85% to 3% of the total microbial community. The results from this study demonstrate the strong effect that sunlight has on microbial community composition, as measured by NGS, and the importance of considering temporal effects in future applications of NGS to identify microbial pollution sources.

FOOTNOTES

    • Received 4 December 2014.
    • Accepted 7 January 2015.
    • Accepted manuscript posted online 9 January 2015.
  • Supplemental material for this article may be found at http://dx.doi.org/10.1128/AEM.03950-14.

  • Copyright © 2015, American Society for Microbiology. All Rights Reserved.
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Temporal Stability of the Microbial Community in Sewage-Polluted Seawater Exposed to Natural Sunlight Cycles and Marine Microbiota
Lauren M. Sassoubre, Kevan M. Yamahara, Alexandria B. Boehm
Appl. Environ. Microbiol. Feb 2015, 81 (6) 2107-2116; DOI: 10.1128/AEM.03950-14

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Temporal Stability of the Microbial Community in Sewage-Polluted Seawater Exposed to Natural Sunlight Cycles and Marine Microbiota
Lauren M. Sassoubre, Kevan M. Yamahara, Alexandria B. Boehm
Appl. Environ. Microbiol. Feb 2015, 81 (6) 2107-2116; DOI: 10.1128/AEM.03950-14
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