Diversity of Diazotrophic Unicellular Cyanobacteria in the Tropical North Atlantic Ocean |
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| Authors: | Luisa I Falcn Frank Cipriano Andrei Y Chistoserdov and Edward J Carpenter |
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| Institution: | Luisa I. Falcón, Frank Cipriano, Andrei Y. Chistoserdov, and Edward J. Carpenter |
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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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