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We studied the effects of water level in the Danube River on waterbird species abundance and species assemblages along 83 km from the border of Hungary and Slovakia. 651,622 birds of 62 species were counted between 1992 and 2009. The dominant species was Mallard Anas platyrhynchos contributing 436,198 individuals (66.9% of all observations). Throughout the year total numbers of individuals and species...
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