Raptor migration in an oceanic flyway : wind and geography shape the migratory route of grey-faced buzzards in East Asia

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2018
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Yamaguchi, Noriyuki M.
Higuchi, Hiroyoshi
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Royal Society Open Science. 2018, 5(3), 171555. eISSN 2054-5703. Available under: doi: 10.1098/rsos.171555
Zusammenfassung

Flapping flight is relatively costly for soaring birds such as raptors. To avoid costly flight, migrating raptors generally avoid flying over water. As a result, all but one of the global raptor migration flyways are largely over land. The East Asian oceanic flyway for raptors is the exception. Raptor species using this flyway migrate by island-hopping, flying over open ocean for distances of up to 300 km between islands. We used satellite telemetry data for grey-faced buzzards Butastur indicus, a species that dominates the southern part of the flyway, to investigate the geographical and atmospheric factors responsible for the suitability of this flyway for raptor migration. Using a combination of least-cost path analysis and a step selection function, we found that the occurrence of numerous islands and also suitable wind support along the oceanic flyway are responsible for route selection in grey-faced buzzards. These results confirm the role of islands, but also wind, in shaping the East Asian oceanic flyway of long-distance raptor migration.

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ISO 690NOURANI, Elham, Kamran SAFI, Noriyuki M. YAMAGUCHI, Hiroyoshi HIGUCHI, 2018. Raptor migration in an oceanic flyway : wind and geography shape the migratory route of grey-faced buzzards in East Asia. In: Royal Society Open Science. 2018, 5(3), 171555. eISSN 2054-5703. Available under: doi: 10.1098/rsos.171555
BibTex
@article{Nourani2018-03Rapto-42239,
  year={2018},
  doi={10.1098/rsos.171555},
  title={Raptor migration in an oceanic flyway : wind and geography shape the migratory route of grey-faced buzzards in East Asia},
  number={3},
  volume={5},
  journal={Royal Society Open Science},
  author={Nourani, Elham and Safi, Kamran and Yamaguchi, Noriyuki M. and Higuchi, Hiroyoshi},
  note={Article Number: 171555}
}
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