SEEN - SE European Bird Migration Network
Autumn migration, body condition and fat core of Robins (Erithacus rubecula) in Hungary

Zsuzsa Gyimothy 1, Jozsef Gyuracz J.2, Laszlo Bank L.3, Peter Banhidi P. 3, Roland Farkas4, Akos Nemeth5, Tibor Csorg?6
1University of West Hungary, Faculty of Forestry, Sopron H-9400, Ady Endre. u. 5., Hungary
2Berzsenyi College, Department of Zoology, Szombathely H-9700, Karolyi Gaspar. ter 4., Hungary
3BirdLife Hungary, Budapest H-1121, Kolt? u. 21., Hungary
4Aggtelek National Park, Josvaf? H-3758, Tengerszem oldal 1., Hungary
5Kiskunsag National Park, Kecskemet H-6001, Liszt Ferenc u. 19., Hungary
6Loránd Eötvös University, Department of Anatomy, Cell and Development Biology, Budapest H-1117, Pázmány Péter sétány 1/C, Hungary 2

The autumn migration of the Robin Erithacus rubecula was studied using data on birds captured from 13 August to 27 October of 2004 in Izsak, Ocsa (Central Hungary), Sumony (Southern Hungary), Szalonna (Northern Hungary) and Tomord (Western Hungary) bird ringing stations of Actio Hungarica. During this period 3671 individuals were captured at the five study sites. The migration patterns of the Robin populations were analysed, based on daily captures and 599 recaptures of ringed birds. We compared the dynamics of migration and morphometrical characteristics (wing-length, body mass, fat) of migratory populations of the different five study areas. The median dates of the autumn migration generally fall in the last week of September. The migration begins the earliest in Szalonna and the latest in Izsak. The recapture rate was the biggest (22,01%) in Sumony and the smallest (1,03%) in Izsak. The mean minimum stopover time of recaptured birds was the longest (8,95}10,58 days) in Szalonna and it was 3-6 days long in the other four sites. The mean of the stored fat of ringed birds in September and October was the smallest in Szalonna, on the other hand the increase of body mass and fat of the recaptured birds, was the biggest here. Comparing the five different study sites we found three significant differences in the wing-length average of the ringed birds. The breeding population in Hungary is uniform considering the wing-length but the ones breeding geographically closer show more similarity. The five sites have different qualities from the point of view of the habitat preference of the Robin. Some of them also serve as a breeding place - on a different level though - while others have a role only periodically during the migration of the species. In our study sites, birds of different origin with varying wing morphology pass through in a different scale. This fact can cause the differences appearing in wing-length. Supported by Scientific Committee of Berzsenyi College.

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