MARINE VEGETATION OF THE SEYCHELL ISLANDS AND CONCENTRATION FUNCTION OF TRACE-ELEMENTS

Content of heavy metals (Cr, Mn, Fe, Ni, Cu, Zn, Cd, Pb) in some macro phytes from Curiose island and Aldabra atoll (Seichell Archipelago) wa s studied by atomic absorbtion method. Macroalgae Sargassum oligocystu m, Turbinaria ornata, Padina boryana, Halimeda incrassata, H. micrones ica and sea-grass Thalassodendron ciliatum were investigated. Maximal metal accumulation was observed for a specific group concentrator P. b oryana. Fe/Mn ratio was 0.4 for Th. ciliatum and 2.84 for brown algae. Sea-grass contains more Ni and less Zn than seaweeds. Different veget ative organs of Th. ciliatum (stems, leaves, vaginas) differ in accumu lative abilities. Copper (Th. ciliatum leaves) and zinc (ail vegetativ e parts of plants) concentrations are higher in the lagoon than on the reef-flat of Aldabra atoll. No metal contamination of the investigate d region was detected.