SČÍTANIE ZIMUJÚCICH ORLIAKOV MORSKÝCH (HALIAEETUS ALBICILLA) NA SLOVENSKOM ÚSEKU DUNAJA V ZIME 2012/2013.

Data on wintering population of white-tailed sea eagle (Haliaeetus albicilla Linnaeus, 1758) presented in this report were synchronously sampled by experienced voluntary observers from 50 stationary points on 26. 1. 2013 since 9:00 till 14:00. Points were distributed along Danube banks between river km (rkm) 1863-1708 (with partially uncovered sections between rkm 1775-1764, 1741-1735, 1731-1727, and 1722-1714) and dikes of Gabčíkovo hydro power plant's (GHPP) storage lake and head- and tailwater canal. Points were arranged to provide optimal range of vision from each one. Census was realized in favourable weather conditions with good visibility. Totally, in whole investigated area of Danube River and water bodies of GHPP, 57 individuals of W-tSE were recorded. Among them, 20 adults and 23 immature birds were identified. Highest concentration of W-tSEs was found in river sections of the Danube river between RKM 1818-1808 (10 W-tSEs (4 adults, 6 immatures)), rkm 1828-1818 (7 W-tSEs (3 adults, 4 immatures)), rkm 1843-1835 (7 W-tSEs (2 adults, 1 immature)) and in upper part of storage lake of GHPP, rkm 1857- 1853 (4 W-tSEs (1 adult)). Highest density was in section of branch system with adjacent area (rkm 1843-1809) with 0.79 bird per 1 rkm) and storage lake of GHHP with adjacent area with 0.71 bird per 1 rkm). Lowest density (0.18 bird per 1 rkm) was found in section rkm 1766-1709 with highly urbanized right bank. [ABSTRACT FROM AUTHOR]