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Applied and Environmental Microbiology, September 2000, p. 4105-4111, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

In Situ Reproductive Rate of Freshwater Caulobacter spp.†

Jeanne S. Poindexter,1,* Kanan P. Pujara,1 and James T. Staley2

Barnard College, Columbia University, New York, New York,1 and University of Washington, Seattle, Washington2

Received 4 August 1999/Accepted 22 June 2000

Electron microscope grids were submerged in Lake Washington, Seattle, Wash., in June 1996 as bait to which Caulobacter sp. swarmers would attach and on which they would then reproduce in situ. Enumeration of bands in the stalks of attached cells implied that the caulobacters were completing approximately three reproductive cycles per day. A succession of morphological types of caulobacters occurred, as well as an episode of bacteriovore grazing that slowed the accumulation of caulobacters and prevented the aging of the population.

* Corresponding author. Mailing address: Department of Biological Sciences, Barnard College, Columbia University, 3009 Broadway, New York, NY 10027-6598. Phone: (212) 854-1415. Fax: (212) 854-1950. E-mail: jpoindexter{at}barnard.edu.

dagger This report is dedicated to the memory of W. T. Edmondson, who so faithfully defended the quality of life of the inhabitants of Lake Washington for most of the twentieth century.

Applied and Environmental Microbiology, September 2000, p. 4105-4111, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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