Migratory restlessness in an equatorial nonmigratory bird

The urge of captive birds to migrate manifests itself in seasonally occurring restlessness, termed "Zugunruhe." Key insights into migration and an endogenous basis of behavior are based on Zugunruhe of migrants but have scarcely been tested in nonmigratory birds. We recorded Zugunruhe of A...

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Bibliographic Details
Published in:PLoS biology 2006-04, Vol.4 (4), p.e110-e110
Main Authors: Helm, Barbara, Gwinner, Eberhard
Format: Article
Language:English
Subjects:
Animal Behavior
Animal Migration
Animals
Birds
Birds - physiology
Ecology
Evolution
Experiments
Kenya
Light
Noise
Photoperiod
Saxicola torquata
Seasons
Studies
Time Factors
Zoology
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Summary:The urge of captive birds to migrate manifests itself in seasonally occurring restlessness, termed "Zugunruhe." Key insights into migration and an endogenous basis of behavior are based on Zugunruhe of migrants but have scarcely been tested in nonmigratory birds. We recorded Zugunruhe of African stonechats, small passerine birds that defend year-round territories and have diverged from northern migrants at least 1 million years ago. We demonstrate that Zugunruhe is a regular feature of their endogenous program, one that is precisely timed by photoperiod. These results extend ideas of programs for periodic movement to include nonmigratory birds. Such programs could be activated when movements become necessary, in line with observed fast changes and high flexibility of migration. Attention to Zugunruhe of resident birds promises new insights into diverse and dynamic migration systems and enhances predictions of avian responses to global change.
ISSN:1545-7885
1544-9173
1545-7885
DOI:10.1371/journal.pbio.0040110