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Applied and Environmental Microbiology, November 2002, p. 5498-5507, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5498-5507.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Bacteria of the {gamma}-Subclass Proteobacteria Associated with Zooplankton in Chesapeake Bay

J. F. Heidelberg,1,{dagger} K. B. Heidelberg,2 and R. R. Colwell1,3*

Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore, Maryland 21202,1 Department of Cell Biology and Molecular Genetics,3 Department of Biology, University of Maryland, College Park, Maryland 207422

Received 15 March 2002/ Accepted 5 August 2002

The seasonal abundance of {gamma}-subclass Proteobacteria, Vibrio-Photobacterium, Vibrio cholerae-Vibrio mimicus, Vibrio cincinnatiensis, and Vibrio vulnificus in the Choptank River of Chesapeake Bay associated with zooplankton was monitored from April to December 1996. Large (>202-µm) and small (64- to 202-µm) size classes of zooplankton were collected, and the bacteria associated with each of the zooplankton size classes were enumerated by fluorescent oligonucleotide direct count. Large populations of bacteria were found to be associated with both the large and small size classes of zooplankton. Also, the species of bacteria associated with the zooplankton showed seasonal abundance, with the largest numbers occurring in the early spring and again in the summer, when zooplankton total numbers were correspondingly large. Approximately 0.01 to 40.0% of the total water column bacteria were associated with zooplankton, with the percentage of the total water column bacteria population associated with zooplankton varying by season. A taxonomically diverse group of bacteria was associated with zooplankton, and a larger proportion was found in and on zooplankton during the cooler months of the year, with selected taxa comprising a larger percent of the Bacteria in the summer. V. cholerae-V. mimicus and V. vulnificus comprised the bulk of the large and small zooplankton-associated Vibrio-Photobacterium species. In contrast, V. cincinnatiensis accounted for less than 0.1 to 3%. It is concluded that water column and zooplankton bacterial populations vary independently with respect to species composition since no correlation was observed between taxa occurring with highest frequency in the water column and those in association with zooplankton.

* Corresponding author. Mailing address: Center of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 E. Pratt St., Baltimore, MD 21202. Phone: (703) 292-8000. Fax: (703) 292-9232. E-mail: colwell{at}umbi.umd.edu.

{dagger} Present address: The Institute for Genomic Research (TIGR), Rockville, MD 20850.

Applied and Environmental Microbiology, November 2002, p. 5498-5507, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5498-5507.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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