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


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Title: Raptor migration in an oceanic flyway: wind and geography shape the migratory route of grey-faced buzzards in East Asia
Authors: Nourani, Elham / Safi, Kamran / Yamaguchi, Noriyuki M. / Higuchi, Hiroyoshi
Issue Date: 7-Mar-2018
Publisher: Royal Society
Citation: Royal Society Open Science, 5(3), 171555; 2018
Abstract: 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 300km 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.
Keywords: Butastur indicus / East-Asian oceanic flyway / Least-cost path / Step selection function / Water-crossing / Wind support
URI: http://hdl.handle.net/10069/38254
DOI: 10.1098/rsos.171555
Rights: © 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/38254

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