We analyzed the ability of freshwater taxa of the genus Ulva (Ulvaceae, Chlorophyta) to serve as bioin-
dicators of metal in lakes and rivers. Changes in heavy metal (Ni, Cd and Pb) and alkaline earth metal
(Ca and Mg) concentrations in freshwater Ulva thalli were investigated during the period from June to
August 2010. The study was conducted in two ecosystems in Western Poland, the Malta lake (10 sites)
and the Nielba river (six sites). Three components were collected for each sample, including water, sed-
ment and Ulva thalli. The average concentrations of metals in the water sample and in the macroalgae
decreased in the following order: Ca > Mg > Ni > Pb > Cd. The sediment revealed a slightly altered order:
Ca > Mg > Pb > Ni > Cd. Ca and Mg were found at the highest concentrations in thalli due to the presence
of carbonate on its surface. Among the examined heavy metals in thalli, Ni was in the highest concentra-
tion, and Cd found in the lowest concentration. There were statistically significant correlations between
the levels of metals in macroalgae, water and sediment. Freshwater populations of Ulva exhibited a
greater efficiency to bioaccumulate nickel as compared to species derived from marine ecosystems.
We analyzed the ability of freshwater taxa of the genus Ulva (Ulvaceae, Chlorophyta) to serve as bioin-dicators of metal in lakes and rivers. Changes in heavy metal (Ni, Cd and Pb) and alkaline earth metal(Ca and Mg) concentrations in freshwater Ulva thalli were investigated during the period from June toAugust 2010. The study was conducted in two ecosystems in Western Poland, the Malta lake (10 sites)and the Nielba river (six sites). Three components were collected for each sample, including water, sed-ment and Ulva thalli. The average concentrations of metals in the water sample and in the macroalgaedecreased in the following order: Ca > Mg > Ni > Pb > Cd. The sediment revealed a slightly altered order:Ca > Mg > Pb > Ni > Cd. Ca and Mg were found at the highest concentrations in thalli due to the presenceof carbonate on its surface. Among the examined heavy metals in thalli, Ni was in the highest concentra-tion, and Cd found in the lowest concentration. There were statistically significant correlations betweenthe levels of metals in macroalgae, water and sediment. Freshwater populations of Ulva exhibited agreater efficiency to bioaccumulate nickel as compared to species derived from marine ecosystems.
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