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Breeding success and juvenile dispersal in the Hoopoe Upupa epops in the region of Lake Neusiedl Burgenland, Austria 1961-1991 Bruterfolg und Ansiedlungsentfernung beim Wiedehopf Upupa epops im Neusiedler See-Gebiet 1961-1991


Egretta, 462: 136-146
Breeding success and juvenile dispersal in the Hoopoe Upupa epops in the region of Lake Neusiedl Burgenland, Austria 1961-1991 Bruterfolg und Ansiedlungsentfernung beim Wiedehopf Upupa epops im Neusiedler See-Gebiet 1961-1991
The number of Hoopoes (Upupa epops) in the agricultural area of the Seewinkel by Lake Neusiedl has declined since the middle of the 1990s. From 1961 to 1991 394 nestlings were ringed in 111 broods. We used this material to investigate the variation in breeding success and juvenile dispersal. The mean number of fledged young per successful brood was 3.55 ( plus or minus 1.43). There was no variation in the number of fledged young per brood by season nor between first and second broods (Fig. 1). Assuming that total breeding failure occurs in 20 % of nests and that replacement/second broods occur at 20 % of the rate of successful first broods, the reproductive success can be estimated at 3.4 young per breeding pair and year. This level is theoretically sufficient for a stable population. Breeding success was found to depend on weather and varied between years from 2.6 to 4.6 young per nest. How-ever, no long-term trend could be detected (Fig. 2). The population decline around the middle of the 1990s can thus not be attributed to a decrease of local reproductive success before 1990. Climatic data, also for 1992-1995, makes a weather-induced fall in reproductive rate appear unlikely. Of the ringed nestlings, three birds were recorded in Lower Austria, Italy and Ukraine but only four at distances 510 km. This low recovery rate in the study area is discussed with regard to juvenile dispersal.

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Accession: 038026057



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