Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. V
Written by Katya VELICHKOVA, Ivaylo SIRAKOV, Elica VALKOVA, Stefka STOYANOVA, Gergana KOSTADINOVA
Lemna sp. have an important role indifferent aspect of aquatic ecosystems serving as a food source, by providing shelter to fish and aquatic invertebrates, changing water quality by regulating oxygen balance, nutrient cycles, and accumulating heavy metals.The aim of present study was to investigate a new found species of Lemna in Bulgarian water reservoirs regarding their protein content and bioaccumulation of heavy metals. Two water bodies located on the territory of South East Bulgaria –Tvardica Dam Lake with growing L. minuta and Nikolaevo fishpond with growing L. valdiviana were studied. Crude protein, lipid, ash contentin two species of Lemna were analysed. The heavy metal in water andaquatic plants was determined on an atomic absorption spectrometer (AAS) "A Analyst 800" - Perkin Elmer. The highest quantity of protein was measured in L. minuta (26.42%), which was 8.71% more compared to L. valdiviana (24.12). The concentrations of metals in the L. minuta and L. valdiviana followed a downward trend: Mn>Fe>Zn>Cu>Ni>Cr>Pb>Cd. The series of bioaccumulation is in descending order: Mn>Fe>Cu>Zn>Cr> Cd>Pb>Ni for L. minuta, and Mn>Fe>Zn>Cu>Cd>Pb>Cr>Ni for L. valdiviana.
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