EN
The paper presents the results of studies on the influence of cooper, in the presence of siderophores, on the rate of carbon-14 incorporation into the algae cells.Axenic strains of unicellular algae:Scenedesmus microspina (Martens and Pankow), Anacystis nidulans (Nagelli) and natural populations of phytoplankton from the Gulf of Gdansk have been tested.