Faculty of Biology, University of Latvia
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Acta Univ Latv (2008) 745: 63–74
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Environmental and

Acta Univ Latv (2008) 745: 63–74

Orginal Article

Influence of inorganic nutrients and dissolved organic matter on the growth of cyanobacteria Microcystis aeruginosa isolated from the Gulf of Riga

Santa Purvina1*, Christian Béchemin2, Maija Balode1, Daniel Grzebyk2, Serge Y. Maestrini2
1Latvian Institute of Aquatic Ecology, Daugavgrīvas 8, LV-1048, Riga, Latvia
2Centre de Recherche en Ecologie Marine et Aquaculture de L’Houmeau (CNRS-IFREMER), B.P. 5, F-17137 L’Houmeau, France
*Corresponding author, E-mail: santa.purvina@lhei.lv


The influence of nutrient additions in N-limiting, P-limiting and in DIN:DIP-balanced conditions with and without dissolved organic matter (DOM) of land origin was studied on the growth and toxin content of Microcystis aeruginosa isolated from the Gulf of Riga. The dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) supply in balanced ratio of DIN : DIP = 16 is the main determinative factor for M. aeruginosa development, promoting increases in cell biomass, chlorophyll a content and particulate organic matter. In medium enriched only by DOM, M. aeruginosa used 31 % of the available dissolved organic nitrogen and 53 % of the dissolved organic phosphorus. The experiment conditions did not invoke increment of toxicity. The experiments showed that the development of M. aeruginosa is promoted by the raised load of inorganic nutrients and dissolved organic matter to the brackish ecosystems of the Baltic Sea.

Key words: cyanobacteria, dissolved organic matter, Microcystis aeruginosa, nutrient limitation, the Gulf of Riga.

Acta Univ Latv (2008) 745: 63–74
 DOI: http://doi.org/10.22364/eeb

Prof. Gederts Ievinsh
Published by
University of Latvia

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