| Titre : | Yearly and daily activity of two transponder-ringed pairs of Jackdaw Corvus monedula at their breeding place |
| Auteurs : | Hans Arens, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (130(4) 2009) |
| Article en page(s) : | 175-182 |
| Mots-clés: | essai |
| Résumé : | This study aimed at recording daily and yearly activity patterns of two pairs of Jackdaws of a little colony in the southern Emsland, Lower Saxony, Northwest Germany, from the beginning of March 2008 to the end of February 2009 by using transponder technology. Two pairs of Jackdaws were ringed with bird rings with an attached transponder. Readers for receiving the transponder signals were installed below the entrances of the nest boxes, so that each bird's visit was recorded with its identity number, date and hour. The nest boxes were visited by Jackdaws regularly all year-round, also outside the breeding season. None of the ringed Jackdaws was recorded absent from the nest for longer than two clays. The main activity of the Jackdaws was in May, when both pairs fed four juveniles. In this month, a peak of 3,720 monthly visits was recorded for one pair and of 3,750 visits for the other. One Jackdaw pair was registered inspecting the nest of the other pair in 9 out of 12 months.During all 12 months, the Jackdaws were most active during the morning hours. When the juveniles had left the nests at the beginning of June, the breeding pairs only rarely inspected their nest boxes in the afternoon - until the beginning of October. Up to November, activities in the afternoon increased continuously, but were never (not even in May) as frequent as during the morning hours. During the night between 23:05 p.m. and 5:01 a.m. no Jackdaw could be recorded. The beginning and end of activities followed sunrise and sunset, also outside the breeding period. |
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