engleski

Aquatic plant Trapa natans L. as bioindicator of trace metal contamination in freshwater lake (Skadar Lake, Montenegro)

Skadar Lake is the largest shallow lake in the southeastern Europe. It is located within a National Park, and is included in the Ramsar list of international important wetlands, so its preservation and protection from pollution is very important. Aim of this study was to investigate bioaccumulation of ecotoxic metals Cd, Pb and Cr from sediments of the Skadar Lake in the aquatic mycrophyte Trapa nantas L. Samples of sediment and plants were collected at nine locations covering all major water inputs to the lake as well as locations where contamination could be expected. Obtained results indicate that sediments from the Skadar Lake are only locally contaminated with Cd (0.03-1.18 mgkg-1), generally contaminated with Cr (15.8-180 mgkg-1), the concentrations of both elements frequently exceeding sediment quality guidelines, while concentrations of Pb were low (2.7-17.4 mgkg-1). The highest bioaccumulation of all metals from sediment to Trapa nantas L. was observed in the root, with the accumulation efficiency decreasing in the order Cd>Cr>Pb. Translocation from root to stem was also higher for Cd than for Cr and Pb, while the translocation from stem to leaf was comparable for all three metals. From the three investigated metals Cd showed the highest mobility. Obtained results indicated that Trapa natans L. may be a very promising bioindicator of trace metals contamination in the Skadar Lake.

bioaccumulation ; bioindicator ; cadmium ; chromium ; lead ; sediment ; Skadar Lake ; trapa natans L

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