Die aktuelle Studie (s.u.) von MICHAL PODHRAZSKY et al. zeigt, das der Klimawandel auch bei Wildgänse dazu führt, dass traditionelle Überwinterungsgebiete aufgegeben werden und neue erschlossen werden.
Vor diesem Hintergrund sind Erhaltungsziele bezogen auf Gastvogelbestände wie Stabile Gastvogelbestände und Wintervorkommen in der aktuellen Größenordnung, wie sie in der niedersächsischen Strategie zum Arten- und Biotopschutz Vollzugshinweise zum Schutz von Gastvogelarten in Niedersachsen formuliert werden, zu hinterfragen.
Studie: Central European Greylag Geese Anser anser show a shortening of migration distance and earlier spring arrival over 60 years
Abstract
Global climate change can cause pronounced changes in speciesʼ migratory behaviour. Numerous recent studies have demonstrated climate-driven changes in migration distance and spring arrival date in waterbirds, but detailed studies based on long-term records of individual recapture or re-sighting events are scarce. Using re-sighting data from 430 marked individuals spanning a 60-year period (winters 1956/1957 to 2015/2016), we assessed patterns in migration distance and spring arrival date, wintering-site fidelity and survival in the increasing central European breeding population of Greylag Geese Anser anser. We demonstrate a long-term decrease in migration distance, changes in the wintering range caused by winter partial short-stopping, and the earlier arrival of geese on their breeding grounds. Greylag Geese marked on central Europe moulting grounds have not been recorded wintering in Spain since 1986 or in Tunisia and Algeria since 2004. The migration distance and spring arrival of geese indicated an effect of temperature at the breeding site and values of the NAO index. Greylag Geese migrate shorter distances and arrive earlier in milder winters. We suggest that shifts in the migratory behaviour of Central European Greylag Geese are individual temperature-dependent decisions to take advantage of wintering grounds becoming more favourable closer to their breeding grounds, allowing birds to acquire breeding territories earlier.
Quelle: https://www.researchgate.net/
Studie: Central European Greylag Geese Anser anser show a shortening of migration distance and earlier spring arrival over 60 years
MICHAL PODHRAZSKY,1,2 PETR MUSIL,3* ZUZANA MUSILOVA,3 JAN ZOUHAR,3 MATYAS ADAM,3 JAROSLAV ZAVORA4 & KAREL HUDEC5
1 ZOO Dvur Kralove, Stefanikova 1029, CZ-54401, Dvur Kralove nad Labem, Czech Republic
2 Department of Zoology, Faculty of Natural Science, Charles University, Vinicna 7, CZ-128 44 Prague 2, Czech Republic
3 Faculty of Environmental Sciences, Czech University of Life Sciences, Kamycka 1176, CZ-165 21 Prague 6, Czech Republic
4 Prazska tr . 2085/453, Ceske Budejovice,Czech Republic
5 Hluboka 5, CZ-639 00 Brno, Czech Republic