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1 October 2010 A Double-Clock or Jetlag Mechanism is Unlikely to be Involved in Detection of East—West Displacements in a Long-Distance Avian Migrant
Dmitry Kishkinev, Nikita Chernetsov, Henrik Mouritsen
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Migratory birds are known to be able to navigate—to determine their position on the globe and the direction toward their distant goal—even if they cannot perceive any information emanating from the goal. One hypothesis, that of true bicoordinate navigation, claims that birds should be able to sense and use a grid of two natural parameters as coordinates. Some indirect data support the idea that migratory birds can determine their north—south position, and several recent studies have suggested that at least longdistance migrants, including the Eurasian Reed Warbler (Acrocephalus scirpaceus), can determine their east-west position. How they do this remains a mystery. Birds could theoretically detect the magnitude of east-west displacements if they have two clocks, one synchronizing faster to local time than the other. We tested whether this putative “double-clock” mechanism may serve as a navigational tool for detecting east-west position. We captured Eurasian Reed Warblers during spring migration and tested their orientation in Emlen funnels under capture-site photoperiodic conditions. After these northeasterly oriented control tests, we exposed them to a light—dark regime that simulated a 1,000-km eastward displacement to the Moscow region from which we have shown that actually displaced Eurasian Reed Warblers on spring migration compensate for their displacement by orienting northwestwardly. Exposure to the Moscow light-dark regime did not affect the birds' orientation. Our results suggest that light-dark regime effects alone are unlikely to trigger compensation for the longitudinal displacement in long-distance migratory Eurasian Reed Warblers.

© 2010 by The American Ornithologists' Union. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website,
Dmitry Kishkinev, Nikita Chernetsov, and Henrik Mouritsen "A Double-Clock or Jetlag Mechanism is Unlikely to be Involved in Detection of East—West Displacements in a Long-Distance Avian Migrant," The Auk 127(4), 773-780, (1 October 2010).
Received: 12 February 2010; Accepted: 1 June 2010; Published: 1 October 2010
Acrocephalus scirpaceus
double-clock hypothesis
Eurasian Reed Warbler
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