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Zellweger-Fischer, J., M. Schaub, C. Müller, M. Rudin, M. Spiess & L. Jenni

Der Bruterfolg des Turmfalken Falco tinnunculus: Resultate und Erkenntnisse aus fünf Jahren integriertem Populationsmonitoring.

2011

108

37–54

Key words
(von 1994 bis 2006 vergeben)

Beringung, Brutbiologie, Brutbeginn, Schlüpfbeginn, Legebeginn, Gelegegrösse, Brutgrösse, Nestlingsgewicht, Landwirtschaft, Ackeranteil, Höhe, regionale Unterschiede

Schlagwort_Vogelart
(wissenschaftlich)

Falco tinnunculus

Schlagwort_Vogelart
(deutsch)

Turmfalke

Schweiz, Genferseegebiet, Jura, Mittelland

deutsch

Abhandlung

Reproductive success in Common Kestrels Falco tinnunculus: results from integrated population monitoring over five years. – Reproductive output is a key component in population dynamics. We studied temporal and spatial variation of laying date, clutch size, brood size and nestling body mass of Common Kestrels from several regions of Switzerland from 2002 to 2006. Based on 968 successful broods, the mean laying date was 24 April, the mean clutch size was 4.9 eggs and the mean brood size was 4.2 nestlings. These components of the reproductive output varied from year to year and from population to population. The spatial variation could partially be explained by altitude, but not by the proportion of arable land. Clutch size, brood size and nestling body mass increased with an early egg-laying date. The egg-laying date itself was presumably affected by varying weather conditions and food supply. Brood size did not vary much between years, which is likely a result of the Kestrel’s flexibility in prey selection. Conservation actions that improve food supply in spring are likely to have a positive effect on the egg-laying date, which in turn might result in increased overall reproductive output.