Abstract

Abstract The aim of this paper was a taxonomic verification of cyanobacteria of the genus Anabaena that occur in the Gulf of Gdańsk. Classical taxonomic methods were combined with modern molecular taxonomic methods (polyphasic approach). Analysis of the species diversity of cyanobacteria from the genus Anabaena was based on the microscopic analysis and on the analysis of 16S rRNA and ITS region. Comparison of the obtained results with sequences in GenBank showed 97.8–100% similarity for 16S rRNA and 98.8-100% similarity in the case of the ITS fragment. Similarity of the 16S rRNA and ITS sequence of 98.5% seems to be sufficient to determine the species.

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