Beobachtungen zur Brutbiologie des Weissrückenspechts Dendrocopos leucotos in Nordbünden.
(von 1994 bis 2006 vergeben)
Paarungsverhalten, Höhlenbrüter, Nestbau, Neststandort, Brutbeginn, Brutperiode, Fütterung, Bruterfolg
Dendrocopos leucotos, Dendrocopos major, Dryocopus martius
Weissrückenspecht, Buntspecht, Schwarzspecht
Schweiz, Graubünden, Rheintal, Prättigau
Observations on the breeding biology of the White-backed Woodpecker Dendrocopos leucotos in the canton of Grisons, eastern Switzerland. 27 broods of the White-backed Woodpecker were recorded in seven areas in the North of the canton of Grisons between 1999 und 2007. Observations of pairs seen together outside the breeding season indicate differences in the mating system from that of the Great Spotted Woodpecker Dendrocopos major. However, this finding could be a consequence of the isolation of the breeding pairs of the White-backed Woodpecker in the study area.
The breeding cavities were mainly built in beech trees, on average 11.5 m above ground and always in completely decayed wood. In 64–77 % of all cases the breeding cavities were excavated freshly. The mean fledging date was 2 June, with 20 to 22 May as earliest and 18 to 21 June as the latest dates.
Breeding success, estimated as 1.3 young per breeding attempt, was slightly lower than the lowest values given in literature. Feeding rates of chicks at the age of 10–20 days were also lower than in other studies. The reproductive output does probably not allow to maintain the local population of White-backed Woodpeckers. Poor quality of the available habitats is the most likely explanation for the low breeding success.
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