| Titre : | Analysis of ringing recoveries of Bearded Tits (Panurus biarmicus) ringed in Eastern Germany |
| Auteurs : | Tobias Duerr, Auteur ; Gertfred Sohns, Auteur ; Heinz Wawrzyniak, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (40(1-2) Oct., 1999) |
| Article en page(s) : | 117-129 |
| Langues: | Allemand |
| Résumé : | Data of 10173 Bearded Tits ringed between 1964 and 1996 and 1883 recoveries were analysed with regard to migration, site fidelity and demography. 153 recoveries concerned change of location (68 long-distance and 85 short-distance recoveries). Bearded Tits are partial migrants in Eastern Germany. 2/3 of them make regular and directed migration within their breeding area, which are similar to short-distance migration. The preferred migratory directions are SSW-W and ESE-S in autumn. Short-distance recoveries show an undirected dispersal. 64.3% of the recovered birds left their breeding respectively birth place in autumn, 35.7% overwintered there. Spring migration was documented by 11 birds. The invasion of 2 birds from the Czech Republic is the first invasion from SE. In spring, 63.2% of the recovered birds left their wintering place in northern direction, 36.8% stayed there for breeding. 20% of the juveniles settled far from their site of birth. 12.1% of the adults changed their breeding place in the following year. The adults take lesser part in the direct expansion of this species. Overwintering site fidelity was shown by 92.5% of the controlled birds and 84.8% of the summer controls showed breeding site fidelity. Those facts verify regular and directed migrations in the Bearded Tit. The research on this problem is difficult due to the low average life expectancy. A special program of the Environment State Office of Brandenburg - State Institute for Bird Conservation Rietzer See and the Hiddensee Ringing Centre applies to this problem since 1996. |
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