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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding biology of a pair of Swifts Apus apus ringed with an attached transponder
Auteurs :	Hans Arens, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (132(3) 2011)
Article en page(s) :	153-159
Résumé :	This study aimed at recording dates of the breeding biology of a pair of Swifts, for each breeding partner (Swift A, B) using transponder technology. In the breeding period 2011, all flights into or out of the nest box of these two Swifts of a little colony in the southern Emsland, Lower Saxony, Northwest Germany, were recorded. Both Swifts were registered daily from May 18th to July 27th, 2011 (min. 1, max. 22). The Swifts always spent the night in the nest box, except for the 6th and 7th of July, when Swift B spent the nights outside after having been disturbed. During the breeding season, 702 flights of Swift A and 535 flights of Swift B into the nest box were recorded. The highest activity of both Swifts was registered between the 13th and the 23th day of the feeding time. After this period, the number of flights decreased. The start of daily activity (first flying out) varied widely for both swifts, the end of activity (last flying in) especially in the feeding period varied less and seemed to follow mainly sunset, especially from the 11th of June.Compared with the highest values at midday, considerably more flights into the nest box could be registered in the feeding time for both Swifts in the evening hours between 21:00 and 22:00 h because of optimal feeding conditions. Both Swifts alternated in breeding and brooding. In this period (May 28th June 20th, 2011) Swift A spent 45.5% of activity time in the nest box, Swift B 53.3%, The nest was no longer than 49 min./day without an adult bird, with one exception (May 30th). The changing was in irregular intervals. In the feeding period, the average daily stay in the nest box of both Swifts during activity time and the average duration of the visits of the swifts decreased with increasing age of the juveniles. Two juveniles left the nest box in the evening, the third at midday of the next day. No juvenile bird returned.

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