(* = Kurzbeitrag)
Der Wiedehopf Upupa epops in Graubünden: Verbreitung, Bestandsentwicklung, Habitate und Nistplätze 2001–2016.
(von 1994 bis 2006 vergeben)
Verbreitung, Siedlungsdichte, Lebensraum, Höhenverbreitung, Bestandsentwicklung, Nistkastenbruten, Nistplatztypen, Bruterfolg, Nistplatzeigenschaften, Artenförderung, Schutzmassnahmen
The Common Hoopoe Upupa epops in the canton of Grisons (Switzerland): distribution, population trends, habitats and nesting sites 2001–2016. The breeding population 2001–2016 of the Common Hoopoe Upupa epops in Grisons (eastern Swiss Alps) was surveyed with a focus on five priority regions. A total of 303 confirmed broods with at least 706 juveniles were recorded (including probable or possible broods, there were 372 territories). Of these, 211 confirmed broods (258 territories) were found in the second half of the study period (2009–2016). The population size increased until 2012 and then decreased or fluctuated, as reflected in the development of the number of juveniles observed, which varied strongly from year to year. In 21 of the up to 130 nest boxes provided, a total of 41 successful broods and 9 breeding attempts were recorded. 20 of the 41 broods took place in only four individual nest boxes and produced at least 122 fledglings (around 59 % of the total of at least 208–209 fledglings from nest boxes). In two of the five priority regions, remarkably large nest-box broods with up to 6–9 fledglings were observed. With an average of 5.1 fledglings per successful brood, nest-box broods thus contributed substantially to the support and promotion of the still small and vulnerable population in Grisons.
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