The content of some macronutrients and heavy metals in aquatic macrophytes of three ecosystems connected to the Danube in Yugoslavia.
Pajević, S.; Vucković, M.; Stanković, Z.; Krstić, B.; Kevresan, Z.; Radulović, S.
In the study of three different aquatic ecosystems connected with the Danube river we determined the concentrations of macronutrients (N, P, K, Ca), Na and heavy metals (Fe, Mn, Ni, Pb and Cd) in the most common submerged, floating and emerged aquatic plants: Ceratophyllum demersum, Myriophyllum spicatum, Vallisneria spiralis, Salvinia natans, Hydrocharis morsus ranae, Trapa longicarpa, Nymphoides flava, Nymphaea alba, and Phragmites communis. Analyses were done during the seasonal biomass peak (June-August) in 1999. Significantly higher macronutrients and heavy metal concentrations in submerged when compared to floating and emerged aquatic plants were found. From the heavy metal concentrations which were measured, iron showed the highest values followed by manganese, nickel and lead, while cadmium exhibited trace concentrations. The degree of metal accumulation in plant tissues (expressed as tissue metal concentration/surrounding water concentration ratio) was locality-dependent. The highest degree was recorded for Mn and Fe. The obtained results indicated an evident chemical pollution of the DTD canal section (near Novi Sad) where V. spiralis had the highest bioaccumulation of Fe and Mn.
Danube river • heavy metal • aquatic macrophyte • Ceratophyllum demersum • Myriophyllum spicatum • Vallisneria spiralis • Salvinia natans • Hydrocharis morsus ranae • Trapa longicarpa • Nymphoides flava • Nymphaea alba