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Environmental Microbiology | Spotlight

Global Comparison of the Bacterial Communities of Bilge Water, Boat Surfaces, and External Port Water

Laura G. Schaerer, Ryan B. Ghannam, Timothy M. Butler, Stephen M. Techtmann
Shuang-Jiang Liu, Editor
Laura G. Schaerer
Department of Biological Sciences, Michigan Technological University, Houghton, Michigan, USA
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Ryan B. Ghannam
Department of Biological Sciences, Michigan Technological University, Houghton, Michigan, USA
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Timothy M. Butler
Department of Biological Sciences, Michigan Technological University, Houghton, Michigan, USA
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Stephen M. Techtmann
Department of Biological Sciences, Michigan Technological University, Houghton, Michigan, USA
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Shuang-Jiang Liu
Chinese Academy of Sciences
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DOI: 10.1128/AEM.01804-19
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ABSTRACT

In the past, ballast water has been a key vector in the ship-mediated dispersal of invasive species. Here, we evaluate the potential for port microorganisms to enter and colonize the hull and bilge water of ships. Due to the small size and ubiquitous nature of bacteria, they also have the potential to be spread through hull fouling and bilge water discharge. The goal of this study was to identify the extent to which the boat microbial community is shaped by the microbial community in the port water where the boat spends most of its time. Here, we compared the microbial communities of the hull and bilge compartments of 20 boats to those of the port water in 20 different ports in five regions around the world. We found that there was a significant difference in microbial diversity between boat and port microbial communities. Despite these differences, we found that Cyanobacteria were present at high abundances in the bilge water of most vessels. Due to the limited light in the bilge, the presence of Cyanobacteria suggests that port microorganisms can enter the bilge. Using source-tracking software, we found that, on average, 40% of the bilge and 52% of the hull microbial communities were derived from water. These findings suggest that the bilge of a vessel contains a diverse microbial community that is influenced by the port microbial community and has the potential to serve as an underappreciated vector for dispersal of life.

IMPORTANCE Invasive species have been a worldwide problem for many years. However, the potential for microorganisms to become invasive is relatively underexplored. As the tools to study bacterial communities become more affordable, we are able to perform large-scale studies and examine bacterial communities in higher resolution than was previously practical. This study looked at the potential for bacteria to colonize both boat surfaces and bilge water. We describe the bacterial communities on boats in 20 shipping ports in five regions around the world, describing how these microorganisms were similar to microorganisms found in port water. This suggests that the water influences the bacterial community of a boat and that microorganisms living on a boat could be moved from place to place when the boat travels.

FOOTNOTES

    • Received 6 August 2019.
    • Accepted 16 September 2019.
    • Accepted manuscript posted online 4 October 2019.
  • Supplemental material for this article may be found at https://doi.org/10.1128/AEM.01804-19.

  • Copyright © 2019 American Society for Microbiology.

All Rights Reserved.

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Global Comparison of the Bacterial Communities of Bilge Water, Boat Surfaces, and External Port Water
Laura G. Schaerer, Ryan B. Ghannam, Timothy M. Butler, Stephen M. Techtmann
Applied and Environmental Microbiology Nov 2019, 85 (24) e01804-19; DOI: 10.1128/AEM.01804-19

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Global Comparison of the Bacterial Communities of Bilge Water, Boat Surfaces, and External Port Water
Laura G. Schaerer, Ryan B. Ghannam, Timothy M. Butler, Stephen M. Techtmann
Applied and Environmental Microbiology Nov 2019, 85 (24) e01804-19; DOI: 10.1128/AEM.01804-19
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KEYWORDS

microbial community composition
bilge water
vessels
port water microbes
microbial communities
ships

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Print ISSN: 0099-2240; Online ISSN: 1098-5336