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Knaus, P.

Invasion des Raufussbussards Buteo lagopus im Winter 2010/11 in der Schweiz

2012

109

229–248

Key words
(von 1994 bis 2006 vergeben)

Verbreitung, Phänologie, Einflug, Seltenheitsnachweis, Verweildauer, Geschlechterverhältnis, Altersstrukur, Wetter

Schlagwort_Vogelart
(wissenschaftlich)

Buteo lagopus, Buteo buteo, Grus grus, Pluvialis apricaria, Cygnus columbianus, Cygnus cygnus, Anser fabalis, Anser albifrons, Anser anser, Branta canadensis, Branta leucopsis, Anser brachyrhynchus, Branta bernicla bernicla, Tadorna tadorna, Anas penelope, Aythya nyroca, Mergus serrator, Gavia arctica, Podiceps grisegena, Podiceps auritus, Botaurus stellaris, Aegithalos caudatus caudatus, Clangula hyemalis, Melanitta nigra, Melanitta fusca

Schlagwort_Vogelart
(deutsch)

Raufussbussard, Mäusebussard, Kranich, Goldregenpfeifer, Zwergschwan, Singschwan, Saatgans, Blässgans, Graugans, Kanadagans, Weisswangengans, Kurzschnabelgans, Ringelgans, Brandgans, Pfeifente, Moorente, Mittelsäger, Prachttaucher, Rothalstaucher, Ohrentaucher, Rohrdommel, Weissköpfige Schwanzmeise, Eisente, Trauerente, Samtente

Schweiz, Europa

deutsch

Abhandlung

Influx of Roughlegs Buteo lagopus into Switzerland in winter 2010/11. – The Roughleg Buteo lagopus is an irregular winter visitor to Switzerland and appears only exceptionally in higher numbers. In winter 2010/11 an invasion was recorded. The Swiss Rarities Committee (SRC) accepted 35 records referring to 36 individuals, spreading over a period from 22 October 2010 to 3 April 2011. The invasion peaked in an influx wave end of December and beginning of January. As a result, the winter 2010/11 became the second highest appearance of this species in Switzerland. An even stronger influx was recorded in winter 1986/87 with three waves. In winter 2010/11 Roughlegs concentrated on the central and western Plateau and around Lake Constance. Half of all individuals were recorded on only one day. A quarter of the birds stayed for at least 5–19 days and 6–14 weeks, respectively. 14 individuals or 75 % of the precisely identified Roughlegs were first-winter birds. On the other hand in winter 1986/87, 35 of the 51 identified individuals or 70 % were adults, the rest was defined as «immature» (thus possibly mainly first-winter birds). This difference might be the result of differences in breeding success, which was very good in 2010. The likely cause of the invasion was the weather: December 2010 was very cold in many parts of Europe and large areas were covered with snow. This led to the abandonment of traditional winter areas by a part of the population, resulting in exceptional numbers of wintering birds particularly in western and central Europe.