From: WWGBP@aol.com
Date: 2011-02-05 02:43
Subject: Adult Hobby (Falco subbuteo) tracked by satellite
Dear All,
Our paper
Meyburg, B.-U., P. W. Howey, C. Meyburg & K. D. Fiuczynski (2011): Two complete migration cycles of an adult Hobby tracked by satellite. British Birds 104: 2-15
has just been published.
The complete paper is available free of charge to all interested parties as PDF download data
on our website:
http://www.raptor-research.de/pdfs/a_sp100p/a_sp153_Meyburg_Howey_2011.pdf (6 MB)
Abstract
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.
In 2009 and 2010 I fitted 12 more adult Eurasian Hobbies (eight females and four males) with
5 g PTTs. We still track several of them. Some more adult birds will again be trapped this year
for telemetry to complete a more comprehensive study.
Best wishes,
Bernd Meyburg
BUMeyburg@aol.com
www.Raptor-Research.de
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