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Applied and Environmental Microbiology, November 2002, p. 5760-5764, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5760-5764.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Diversity of Diazotrophic Unicellular Cyanobacteria in the Tropical North Atlantic Ocean

Luisa I. Falcón,1* Frank Cipriano,2 Andrei Y. Chistoserdov,3 and Edward J. Carpenter4

Marine Sciences Research Center, Stony Brook University, Stony Brook, New York 11794-5000,1 Conservation Genetics Laboratory, Biology Department, San Francisco State University, San Francisco, California 94132,2 Department of Biology, University of Louisiana, Lafayette, Louisiana 70504-2453,3 Romberg Tiburon Center for Environmental Studies, San Francisco State University, Tiburon, California 949204

Received 8 April 2002/ Accepted 14 August 2002

We present data on the genetic diversity and phylogenetic affinities of N2-fixing unicellular cyanobacteria in the plankton of the tropical North Atlantic Ocean. Our dinitrogenase gene (nifH) sequences grouped together with a group of cyanobacteria from the subtropical North Pacific; another subtropical North Pacific group was only distantly related. Most of the 16S ribosomal DNA sequences from our tropical North Atlantic samples were closely allied with sequences from a symbiont of the diatom Climacodium frauenfeldianum. These findings suggest a complex pattern of evolutionary and ecological divergence among unicellular cyanobacteria within and between ocean basins.

* Corresponding author. Mailing address: Romberg Tiburon Center for Environmental Studies, San Francisco State University, 3152 Paradise Dr., Tiburon, CA 94920. Phone: (415) 338-3737. Fax: (415) 435-7121. E-mail: lfalcon{at}sfsu.edu.

Applied and Environmental Microbiology, November 2002, p. 5760-5764, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5760-5764.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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