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VARIOBN IN WINTERING NUMBERS OF GREAT CORMORANT ON SELECTED ROOST SIZES IN CENTRAL BOHEMIA
Dušek, Ondřej ; Musil, Petr (advisor) ; Zasadil, Petr (referee)
The study is based on summarization of current knowledge on population development of Great Cormorant (Phalacrocorax carbo) in Europe and in Czech Republic. Moreoverr, it is focused on assessment of methodical approach to monitoring of wintering population. The Great Cormorant is regularly wintering species in the Czech Republic, since 1985. Nevertheless, it exceeds 1000 individuals since 1993 up to now. The surveys aimed at Cormorant numbers are compared according, results and interpretation of outputs methodology. The compared surveys include both International Waterbird Census carried out by ornithologists and survey organized by Czech Anglers Association.
Moreover, the results of the own field survey are analysed in the paper. The field survey was carried out in Veltrubský luh (village Pňov Předhradí, district Kolín, Central Bohemia) during winter months (December to March) 2015/2016. The numbers varied between 0 and 79. The fluctuations were affected by tree cutting, walking of people as well as by direct cormorant disturbance by local anglers. Nevertheless, the numbers reached between 59 and 78 in days without disturbance. Moreover, regular occurrence of great Cormorants was confirmed also in another neighbouring sites, such as in Poděbrady lake, sand pit lake Samberk, lake Sadská and Žehuňský fishpond.
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