Abstract
Since 1980 cyanobacterial blooms occurred in a large number of reservoirs lakes and water flows (rivers and channels) in Serbia. Among 83 water ecosystems examined, 58 were found in blooming condition almost every year during last 2 decades. All natural lakes, accumulations, rivers and canals in Vojvodina province (agricultural part) proved to be sites with frequent cyanobacterial proliferation. During the summer 2005-spring 2006 microcystin-LR survey in Vojvodina, the toxin was permanently present in all examined ecosystems and the highest value of 362.68 μgL-1 was detected in Ludoš Lake. The part of Central Serbia is very problematic for ground water supply. For that reason more than 20 reservoirs serve as drinking water suppliers. Significant and persistent cyanobacterial blooms have been recognized in 9 of them. Samples for cyanotoxin analyses were taken during and after blooms in Ćelije Reservoir and in drinking water in Kruševac town 2 days later. Concentration of microcystin-LR was 650 μgL-1 in the reservoir while the tap water contained 2.5μgL-1.
Highlights
Since 1980 cyanobacterial blooms ocwarming, increased eutrophication as well toxins
Very interesting point dition almost every year during last 2 decnot yet been fully understood
The presence of toxic cyanobacterial persistant cyanobacterial blooms have weather conditions and the correspond- blooms occurring in bodies of water used been recognized in 9 of them
Summary
Since 1980 cyanobacterial blooms ocwarming, increased eutrophication as well toxins. They are either membrane bound curred in a large number of reservoirs, lakes as the dispersal of cells through ship traf- or exist free inside the cells. Low concen- different toxins within same genus and, on and chanals in Vojvodina province (agricul- trations of dissolved inorganic nitrogen the other hand, the presence of the same tural part) proved to be sites with frequent (DIN) and a surplus of phosphorus (DIP) toxins in widely different genera During the are considered prerequisites for enhanced specificity of cyanotoxins is the very great summer 2005-spring 2006 microcystin-LR growth and bloom formation of N2-fixing variability in toxicity and level of toxicity survey in Vojvodina, the toxin was permacyanobacteria (Kahru et al, 2000) This even between different strains within same nently present in all examined ecosystems can explain the occurrence of cyanobacte- species (Dow and Swoboda, 2000). Concentration of microcystin-LR was up dissolved organic phosphorus (Huber cattle (Puschner et al, 1998), dogs
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