Document Detail

Trophic regulation of Vibrio cholerae in coastal marine waters.
MedLine Citation:
PMID:  16343318     Owner:  NLM     Status:  MEDLINE    
Cholera disease, caused by the bacterium Vibrio cholerae, afflicts hundreds of thousands worldwide each year. Endemic to aquatic environments, V. cholerae's proliferation and dynamics in marine systems are not well understood. Here, we show that under a variety of coastal seawater conditions V. cholerae remained primarily in a free-living state as opposed to attaching to particles. Growth rates of free-living V. cholerae (micro: 0.6-2.9 day(-1)) were high (similar to reported values for the bacterial assemblages; 0.3-2.5 day(-1)) particularly in phytoplankton bloom waters. However, these populations were subject to heavy grazing-mortality by protozoan predators. Thus, grazing-mortality counterbalanced growth, keeping V. cholerae populations in check. Net population gains were observed under particularly intense bloom conditions when V. cholerae proliferated, overcoming grazing pressure terms in part via rapid growth (> 4 doublings day(-1)). Our results show V. cholerae is subject to protozoan control and capable of utilizing multiple proliferation pathways in the marine environment. These findings suggest food web effects play a significant role controlling this pathogen's proliferation in coastal waters and should be considered in predictive models of disease risk.
Alexandra Z Worden; Michael Seidel; Steven Smriga; Arne Wick; Francesca Malfatti; Douglas Bartlett; Farooq Azam
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Environmental microbiology     Volume:  8     ISSN:  1462-2912     ISO Abbreviation:  Environ. Microbiol.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-12-13     Completed Date:  2006-09-01     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  100883692     Medline TA:  Environ Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  21-9     Citation Subset:  IM    
Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, 92093-0202, USA.
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MeSH Terms
Chlorophyll / metabolism
Eukaryota / physiology
Eutrophication / physiology
Feeding Behavior / physiology
Food Chain*
Microscopy, Fluorescence
Models, Theoretical
Population Dynamics
Seawater / analysis,  microbiology*
Vibrio cholerae / growth & development*
Grant Support
Reg. No./Substance:
1406-65-1/Chlorophyll; 479-61-8/chlorophyll a

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