Changes in heavy metal accumulation in Enteromorpha spp. from the Gulf of Gdańsk

Abstract The contents of Cu, Zn, Cd, and Pb were determined in samples of Enteromorpha spp. collected at Jurata at monthly intervals from November 1992 to October 1993, and at different stations on the coast of the Gulf of Gdańsk during one month. Of all the metals analysed, Zn occurs in the highest concentrations, followed by Cu, Pb and Cd. In the samples from Jurata all the four metals displayed considerable seasonal variations in their concentrations, the ranges for each element being Zn -29

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

The aim of the study was to measure the transparent exopolymerparticles (TEP) concentration in cultures of Anabaena flos-aquae OL-K10and to determine the relationship between the quantity of particlesproduced and the light intensity, the age of the culture andthe presence of nitrogen in the culture medium. This is the firsttime TEP production has been investigated in the Nostocales,an order of nitrogen-fixing phytoplankton species. The resultsshowed that TEP production depends on the presence of nitrogenin the culture medium. The longer the culture is grown, the higherthe correlation between its TEP content and its chlorophyll aconcentration