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Estuaries and Coasts

, Volume 41, Issue 8, pp 2289–2303 | Cite as

Impact of Climate Change on Vibrio vulnificus Abundance and Exposure Risk

  • Reem Deeb
  • Daniel Tufford
  • Geoffrey I. Scott
  • Janet Gooch Moore
  • Kirstin Dow
Article

Abstract

Vibrio species are marine bacteria that occur in estuaries worldwide; many are virulent human pathogens with high levels of antibiotic resistance. The average annual incidence of all Vibrio infections has increased by 41% between 1996 and 2005. V. vulnificus (Vv), a species associated with shellfish and occurring in the US Southeast, has ranges of temperature (16–33 °C) and salinity (5–20 ppt) dependencies for optimal growth. Increased water temperatures caused by atmospheric warming and increased salinity gradients caused by sea level rise raise concerns for the effect of climate change on the geographic range of Vv and the potential for increased exposure risk. This research combined monthly field sampling, laboratory analysis, and modeling to identify the current occurrence of Vv in the Winyah Bay estuary (South Carolina, USA) and assess the possible effects of climate change on future geographic range and exposure risk in the estuary. Vv concentrations ranged from 0 to 58 colony forming units (CFU)/mL, salinities ranged from 0 to 28 ppt, and temperature from 18 to 31 °C. A significant empirical relationship was found between Vv concentration and salinity and temperature that fit well with published optimal ranges for growth for these environmental parameters. These results, when coupled with an existing model of future specific conductance, indicated that sea level rise has a greater impact on exposure risk than temperature increases in the estuary. Risk increased by as much as four times compared to current conditions with the largest temporally widespread increase at the most upriver site where currently there is minimal risk.

Keywords

Vibrio vulnificus Climate change Risk Salinity Temperature Model 

Notes

Acknowledgements

This research was funded by a grant from the National Oceanic and Atmospheric Administration (NOAA) Climate Program Office (grant NA11OAR4310148). The authors wish to acknowledge essential assistance from several staff at the NOAA Center for Coastal Environmental Health and Biomolecular Research, especially Mike Fulton and Marie DeLorenzo who helped direct portions of the microbial research analysis as well as James Daugomah and Blaine West who provided exceptional assistance in the collection of field data. Alison Pierce, a graduate student at the University of South Carolina, also assisted with the laboratory analysis of the Vibrio isolates. Paul Conrads (US Geological Survey) provided assistance with integrating this research with the PRISM2 model. This article is dedicated to the memory of Paul Conrads (d. December 2, 2017), our frequent collaborator and friend.

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Copyright information

© Coastal and Estuarine Research Federation 2018

Authors and Affiliations

  1. 1.School of Earth, Ocean and EnvironmentUniversity of South CarolinaColumbiaUSA
  2. 2.Baruch Institute for Marine and Coastal SciencesUniversity of South CarolinaColumbiaUSA
  3. 3.Arnold School of Public Health, Department of Environmental Health SciencesUniversity of South CarolinaColumbiaUSA
  4. 4.National Oceanic and Atmospheric Administration, Center for Coastal Environmental Health and Biomolecular ResearchCharlestonUSA
  5. 5.Department of GeographyUniversity of South CarolinaColumbiaUSA

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