First limnological investigations of the water quality of the Lake Srebrno in Serbia

The first limnological investigations of the Lake Srebrno water quality were performed in March 2007. The investigations included qualitative, quantitative, and saprobiological analyses of bottom fauna communities, physical chemical analyses of sediments and the determination of chlorophyll a concentration, as well as analyses of the trophic status. Samples were collected at eighteen localities distributed along the shore line, as well as from the deep parts of the lake. Twenty taxa from nine macro-invertebrate groups were recorded. The classification of the water in Lake Srebrno was proposed, based on trophic and saprobic levels. Trophic levels were in the range of upper limits of meso- to eutrophy, and within the limits of the eutrophic status. Calculated values of the Saprobic Index S, based on bio-indicator organisms of macrozoobenthos, ranged from S=2.81 to S=3.58. The water quality was estimated to be within the limits proposed to III and IV-III class of the Serbian (Yugoslav) watercourses.Tokom marta 2007. godine obavljena su prva istraživanja kvaliteta vode Srebrnog jezera u Srbiji. Ispitivanja su obuhvatila kvalitativnu, kvantitativnu i saprobiološku analizu zajednica makrozoobentosa, fizičko-hemijsku analizu sedimenata i određivanje koncentracije hlorofila, a kao i analizu trofičnog statusa. Uzorci su sakupljeni sa osamnaest lokaliteta, raspoređenih duž obale u litoralu i iz dubljih zona jezera. U okviru faune dna, zabeleženo je devet faunističkih grupa sa ukupno dvadeset taksona. Procenjivan je kvalitet vode Srebrnog jezera sa stanovišta trofije i saprobnosti. Stupanj trofije Srebrnog jezera je u oblasti gornje granice mezo- na prelazu u eutrofiju i u granicama eutrofnog statusa. Izračunate vrednosti saprobnog indeksa S po metodi Pantle-Bucka, primenom saprobnog sistema bioindikatorskih vrsta makrozoobentosa, bile su u opsegu od S=2,81 do S=3,60. Procenjeni kvalitet vode bio je u granicama III i na prelazu IV-III klasu.nul