Zjawisko oddziaływania allelopatycznego... pikoplanktonowej sinicy synechococcus sp. na nitkowate sinice geitlerinema amfibium i rivularia sp.
Allelopathic effects of picocyanobacterium synechococcus sp. on filamentous cyanobacteria geitlerinema amphibium and rivularia sp.

Summary/Abstract: Allelopathy may be one of the key factors contributing to the dominance of certain species of cyanobacteria in the aquatic environment. In this study the influence of allelopathic activity on the cyanobacteria Geitlerinema amphibium and Rivularia sp. was investigated by the addition of cell-free filtrate of picocyanobacterium Synechococcus sp. These studies indicate that the picocyanobacterium affect G. amphibium positively. It was examined that the Synechococcus sp. reveals allelopathic activity on the fluorescence which results in the stimulation of growth of analyzed cyanobacterium. The effects on G. amphibium were amplified by repeated filtrate additions compared to a single filtrate addition for the growth and fluorescence parameter Fv/Fm. At the seventh day of experiment, after addition the filtrate obtain from the picocyanobacterium, the maximum response of G. amphibium was 114% for growth and 128% for Fv/Fm. Moreover, the study showed that Synechococcus sp. had no allelopathic effect on Rivularia sp. The results suggest that different species of cyanobacteria are characterized by varying sensitivity to the allelochemicals produced by the Synechococcus sp., which can influence the succession of phytoplankton in the aquatic environment.

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