Seasonal migrations of four individual bar-headed geese Anser indicus from Kyrgyzstan followed by satellite telemetry |
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Authors: | Ulrich K?ppen Alexander Petrovich Yakovlev Raimund Barth Michael Kaatz and Peter Berthold |
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Institution: | (1) Hiddensee Bird Ringing Centre, State Office for Environment, Nature Conservation and Geology of Mecklenburg-Western Pomerania, Badenstr. 18, 17439 Stralsund, Germany;(2) Issyk Kul Biosphere Reservation, 722324 Ananyevo, Kyrgysztan;(3) Max Planck Institute for Ornithology, Behavioural Ecology and Evolutionary Genetics, Von der Tann Str. 7, 82346 Andechs, Germany;(4) Vogelschutzwarte Storchenhof Loburg e.V., Chausseestr. 18, 39279 Loburg, Germany;(5) Max Planck Institute for Ornithology, Vogelwarte Radolfzell, Schlossallee 2, Schloss Moeggingen, 78315 Radolfzell, Germany |
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Abstract: | The Kyrgyz population of the bar-headed goose Anser indicus has declined dramatically during the past decades. Human persecution during migration and habitat loss at stopover and wintering
sites are commonly regarded as most serious threats. However, little is known about seasonal movements, migration routes,
and wintering sites of the bar-headed geese from Kyrgyzstan, which represent the westernmost geographical population of the
species. As part of a conservation project, which also included reinforcement of the wild population by the release of hand-reared
juveniles, in late summer of 1998, five bar-headed geese, three wild adults and two hand-reared goslings, were fitted with
sun-powered satellite transmitters in order to track their movements from Lake Son Kul and Lake Chatyr Kul in Kyrgyzstan.
The five individuals contributed very unevenly to the more than 5,000 signals in total that were received from the French
ARGOS system: one failed after 8 weeks, while another one was tracked for more than 2 years. The four geese contributing to
this study followed three completely different migration routes leading to their wintering areas in Pakistan, India and Uzbekistan,
while stopover areas were situated in southern Tajikistan and in western Tibet. Both in autumn and spring the adult birds
migrated distances of 1,280–1,550 km in two steps, with stopover periods of 32–46 days (autumn) and 16–23 days (spring). Flight
speeds of up to 680 km per actual migration day were recorded regularly, even during crossings of very high summits. A hand-reared
juvenile flew non-stop for 790 km to southern Uzbekistan and even visited southernmost Turkmenistan, where the species is
very rarely seen. The timing of migration varied considerably between individuals but also for the same individual between
years. We compare our tracking results with previous findings (field observations, ring recoveries, and satellite tracking
results) and discuss them with respect to migration over high-mountain habitats and a general migration strategy of the species. |
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