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Distribution and abundance of wintering and breeding population of Mute Swan (\kur{Cygnus olor}) in the South Bohemia region
HNÍDKOVÁ, Lucie
This work evaluates quantity of the mute swan (Cygnus olor) in wintering grounds and nesting sites in southern Bohemia. The mute swan became the target species of the JOK 2020 Bird of the Year campaign. The aim of mapping the mute swan population in 2020 was to identify as much of its South Bohemian nesting and wintering population as possible. The census followed similar projects from previous years and it took place in a total of four terms. The most important of them was the third term, which involved the nesting and leading of the young swans. A total of 1358 locations were inspected. In the first term, i.e., during the count in wintering grounds, 387 swans were recorded in 184 locations. During nesting, i.e., in the second and third terms, a total of 1230 locations were inspected, of which 368 (29.92 %) were occupied. There were 162 nesting pairs in 159 locations. In the third term separately, a total of 1003 locations were inspected, 1563 individuals at 221 locations were recorded, 96 pairs with a total of 434 young were present. During the August after-nesting count, 666 locations were inspected, and 1284 swans were recorded at 122 locations. Nesting swans most often occurred in habitats with vegetation area over 25 %.
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