La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Multiple occurrence of second broods in Common Swift Apus apus
Auteurs :	Erich Kaiser, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (125(2) 2004)
Article en page(s) :	113-115
Résumé :	Common Swifts in Europe usually have a single annual brood. This was also the experience of a long-term study over more than 30 years in a colony of 45 pairs in Kronberg near Frankfurt/Main, Germany. In 2004, however, these established facts suddenly were questioned: On 21st July, when most of the nestlings had fledged, fresh eggs were discovered in three nests. This was reason enough to control 54 nest sites, where the nestlings of the first brood had been ringed. From these 54 pairs, 13 (24%) had started second clutches! On August 9th, these 13 nest sites were rechecked, and in five of these nests the nestlings had hatched, the other 8 pairs had started for migration and left their clutches behind. Only one of the five pairs with nestlings stayed long enough to fledge their two nestlings successfully, the other four started for migration, when their nestlings were two to three weeks old. These nestlings were hand-raised to save them from starvation.

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