engleski

Qualitative and Quantitative Composition of Wintering Ornithofauna at the Carp Fishponds in the Sava River Tract

Wintering Anatidae have been researched on eight carp fishponds in the Sava River tract in continental Croatia: "Jasinje", "Narta", "Končanica", "Okučani", "Lipovljani", "Crna Mlaka", "Pisarovina" and "Draganić". The data have been collected during a ten-year period, from January 1987 till January 1996, as a part of the Mid-Winter Waterbird Count. Twenty-two Anatidae species were noted out of a total of 25 species that have contemporaneously wintered in Croatia as a whole. The highest numbers and the most common species were Anas platyrhynchos, followed by Anas crecca, Aythya ferina, Bucephala clangula and Cygnus olor. The index of similarity ranged between 30.8% and 81.1%. The highest species diversity was found at Jasinje fishpond. The Shannon-Wiener diversity index ranged between 0.16 and 0.74. A globally threatened species - Aythya nyroca - was also recorded here. Out of eight investigated fishponds five are evaluated as Important Bird Areas and potential Ramsar Sites.

wintering bird communities; Anatidae; mid-winter waterbird count; carp fishponds; the Sava River

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