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. 2002 Nov;68(11):5760-4.
doi: 10.1128/AEM.68.11.5760-5764.2002.

Diversity of diazotrophic unicellular cyanobacteria in the tropical North Atlantic Ocean

Luisa I Falcón  1 , Frank Cipriano, Andrei Y Chistoserdov, Edward J Carpenter
Affiliations

Diversity of diazotrophic unicellular cyanobacteria in the tropical North Atlantic Ocean

Luisa I Falcón et al. Appl Environ Microbiol. 2002 Nov.

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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Figures

FIG. 1.
FIG. 1.
Phylogram showing the relationships among different cyanobacterial nifH gene sequences constructed through maximum-parsimony bootstrap analysis (details in text). Fragments are approximately 359 bp in length.
FIG. 2.
FIG. 2.
Summary phylogenetic reconstruction among cyanobacterial 16S rDNA sequences created through maximum-parsimony bootstrap analysis (details in text). Sequences marked with an asterisk were determined by this study, and fragments are approximately 422 bp in length.
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