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Titre :	Two complete migration cycles of an adult Hobby tracked by satellite
Auteurs :	Bernd-Ulrich Meyburg, Auteur ; Paul W. Howey, Auteur ; Christiane Meyburg, Auteur ; Klaus Dietrich Fiuczynski, Auteur
Type de document :	Article
Dans :	British Birds (104(1) JAN 2011)
Article en page(s) :	2-15
Résumé :	A prototype of the smallest satellite transmitter produced so far, weighing just 5 g, was fitted to an adult Hobby Falco subbuteo in Germany in August 2008. Two autumn and two spring migrations were recorded successfully from the unit carried by this particular Hobby. All four migration routes were to the west of a direct line between breeding site and wintering area. The migration route in spring 2010 was up to 2,150 km farther west than that in autumn 2009, effectively forming a 'migration loop'. This was much less pronounced in 2008/09. The direct distance from the breeding site to the southernmost point reached in Zimbabwe in 2008/09 was 10,065 km. The fastest flight speeds on migration were recorded in spring 2010 in Mali and Morocco, when 1,243 km was covered in two days. Also in spring 2010, during migration from Morocco to southern France (1,032 km in two days), the falcon migrated at night, when a fix was made over the Mediterranean in the vicinity of Gibraltar. Migration across the Sahara took 4-4.5 days on each migration. The West African equatorial rainforest appears to be a significant ecological barrier, and the significance of this is discussed. Migration was noticeably rapid there with distances of up to 580 km flown per day - also partly at night. During both wintering periods the falcon spent the majority of its time in the Angolan Miombo woodlands, but in winter it also travelled large distances: from 16th October 2008 to 7th April 2009, the bird covered a total distance of at least 9,025 km between identified night roosts. In 2009, the bird spent half the year in the wintering area, a third on the breeding grounds and the remaining 18% of the time on migration; i.e. 65% of its time in Africa and 35% in Europe.

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