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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Transponder ringing for individual recording and observation of Swifts Apus apus
Auteurs :	Hans Arens, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (132(1) 2011)
Article en page(s) :	45-52
Résumé :	This study aimed at recording return and activity patterns in the breeding period of individual swifts using transponder technology. Four breeding birds and seven juveniles of a small colony in the southern Emsland, Lower Saxony, Northwest Germany, were ringed in July 2008 with bird rings with an attached transponder. In 2009, two more juveniles and two non-breeders and in 2010, four more breeding birds were transponder-ringed. Around the entrance hole of the breeding boxes an antennae was placed, which was connected with a reader and a notebook, so that each visit of a bird was recorded with its identity number, date and hour. None of the nine juveniles returned in 2009 and 2010. One of the none-breeders became a breeding bird in 2010 ad 2011. In 2009 and 2010, two marked breeding birds were registered each year (returning re of 50%, n = 4). In 2011, all in 2010 newly transponder-ringed breeding birds as well as the Four breeding birds of 2010 returned (returning rate of 100%, n = 6). One of the breeding birds marked in 2008 returned every year from 2009-2011. All flights into or out of the nest box of this swift in the breeding period 2010 were recorded. The bird was registered daily from 24(th) May to 11(th) August 2010 (min. 1, max. 16). The swift always spent the night in the nest box.During the breeding season, 618 flights into the nest box were recorded. The highest activity was registered between the 14(th) and the 23(rd) day of the feeding time. After this period, the number of flights decreased. The length of daily activity (first flying out, last flying in) depended on the hours of sunshine and the temperature. However, the last flights into the nest box in the evening during the feeding period seemed to follow mainly sunset. Compared with the highest values at midday, more than twice as much flights into the nest box could be registered in the feeding time in the evening hours between 21:00 and 22:00 because of optimal feeding conditions. During breeding time the swift spent 35.9% of activity time in the nest box. In the feeding period the average daily stay in the nest box during activity time and the average duration of the visits of beds decreased with increasing age of the juveniles. One juvenile left the nest box in the evening, the other at midday two days later.

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