Diversity of diazotrophic unicellular cyanobacteria in the tropical North Atlantic Ocean |
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Authors: | Falcón Luisa I Cipriano Frank Chistoserdov Andrei Y Carpenter Edward J |
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Affiliation: | Marine Sciences Research Center, Stony Brook University, Stony Brook, New York 11794-5000, USA. lfalcon@sfsu.edu |
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Abstract: | 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. |
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