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A blue-pigmented hasleoid diatom, Haslea sp., from the Adriatic Sea

Palińska K. A., Surosz W.

Oceanological and Hydrobiological Studies

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2018

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Vol. 47, No. 1

60--66

EN

We present the first report and description of the pinnate diatom Haslea sp. from the northeastern Adriatic Sea, Croatia, producing a blue pigment. This organism is very similar to the well-known Haslea ostrearia, the first described “blue” diatom producing marennine, i.e. the pigment involved in the greening of oysters, and recently described H. provincialis. However, the Croatian diatom slightly differs from other Haslea species in its morphology and 18S rRNA sequence. The discovery of Haslea sp. from Croatia confirmed the possible existence of more species among the representatives of blue Haslea species, as previously assumed. The discovery of several genetically distinct populations of Haslea ostrearia, new species H. karadagensis, H. provincialis and Haslea sp. from Croatia, suggests that species richness in the group of “blue” diatoms is probably underestimated and still more new blue diatoms remain undiscovered. This also raises questions about previously published reports and observations of Haslea distribution in the Mediterranean Sea whether these organisms really belong to H. ostrearia.

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Polyphasic characterization of the genus Anabaena from the Gulf of Gdańsk (Southern Baltic Sea). Application of DGGE in taxonomic studies on environmental samples

Siedlewicz G., Forycka K., Surosz W.

Oceanological and Hydrobiological Studies

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2012

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Vol. 41, No. 3

64-78

EN

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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Production of transparent exopolymer particles (TEP) in the nitrogen fixing cyanobacterium Anabaena flos-aquae OL-K10

Surosz W., Palińska K.A., Rutkowska A.

Oceanologia

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2006

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No. 48 (3)

385-394

EN

The aim of the study was to measure the transparent exopolymer particles (TEP) concentration in cultures of Anabaena flos-aquae OL-K10 and to determine the relationship between the quantity of particles produced and the light intensity, the age of the culture and the presence of nitrogen in the culture medium. This is the first time TEP production has been investigated in the Nostocales, an order of nitrogen-fixing phytoplankton species. The results showed that TEP production depends on the presence of nitrogen in the culture medium. The longer the culture is grown, the higher the correlation between its TEP content and its chlorophyll a concentration.