Hidrológiai Közlöny, 2014 (94. évfolyam)

2014 / 5-6. különszám - LV. Hidrobiológus Napok előadásai

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HIDROLÓGIAI KÖZLÖNY 2014. 94. ÉVF. 5-6. SZ.

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Investigation of the possible role of cylindrospermopsin in cyanobacterium - eukaryotic alga interaction

Dobronoki, D., B-Béres, V, Vasas,. Rektor, A., Nagy, S.A., Bácsi, I.

Abstract: Relations between phytoplankton and phytobentos taxa could be significant in lakes and ponds with extended litoral region. Phytoplankton could affect the individual number and species composition of benthic assemblages in many ways. In this work the interactions between the planktic, cylindrospermopsin producer Aphanizomenon ovalisporum (Cyanobacteria) and a benthic Chlorococcum species (Chlorophyta) were investigated in mixed cultures. The effect of A. ovalisporum crude extract on Chlorococcum cultures were also studied. Cell numbers of both species were lower in mixed cultures compared to control cultures. Cell number of Chlorococcum decreased by 77 % in the presence of 4-fold amount of Aphanizomenon, nevertheless extracellular cylindrospermopsin was not detectable. Crude extract of A. ovalisporum caused growth inhibition of Chlorococcum already to the 7th day of the experiment, but in lower extent (max. 50 %), than in mixed cultures. Nutrient levels changed in a cell number dependent manner in mixed cultures, while it seems that the cyanobacterial extract has no significant effect to the nutrient uptake of the eukaryotic green alga.

Keywords '.Aphanizomenon ovalisporum, Chlorococcum sp., interaction.