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Journal für Ornithologie

, Volume 128, Issue 3, pp 317–324 | Cite as

Interaction of visual and non-visual cues during migratory orientation by the Bobolink (Dolichonyx oryzivorus)

  • Robert C. Beason
Article

Summary

The Bobolink appears to use an integrated orientation system involving at least a star compass and a magnetic compass. The magnetic compass appears to provide the primary reference for the system and the star compass serves as a secondary compass. The star compass appears to be checked against the magnetic compass every 1 to 5 nights, and adjusted to compensate for changes in the relative locations of star patterns. These results are in agreement with those of other species where both the star compass and the magnetic compass have been investigated. Such an integrated orientation system is advantageous to a transequatorial migrant because the night sky changes greatly between the beginning of its journey and the end, even from night to night; and the horizontal magnetic field at the equator is unusable as a dip compass.

Keywords

Magnetic Compass Geomagnetic Field Garden Warbler Stellar Rotation Migratory Orientation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Der Reisstärling scheint ein integratives Orientierungssystem zu benutzen, das einen Sternkompaß, einen Magnetkompaß und möglicherweise noch weiter Faktoren einschließt. Dabei stellt der Magnetkompaß wohl das primäre Referenzsystem dar, während der Sternkompaß als sekundärer Kompaß dient. Der Sternkompaß wird alle 1 bis 5 Nächte mit dem Magnetkompaß verglichen und nachgeeicht, um Veränderungen der Stellung der Sterne zu kompensieren. Die Befunde stimmen mit denen an anderen Arten überein, bei denen sowohl Sternkompaß als auch Magnetkompaß untersucht wurde. Für einenm Transäquatorialzieher ist solch ein integratives Orientierungssystem von Vorteil, da sich einerseits der Sternhimmel von Beginn bis Ende des Zuges, sogar von Nacht zu Nacht, verändert und das horizontale Magnetfeld am Äquator andererseits für einen Inklinationskompaß unbrauchbar ist.

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Copyright information

© Verlag der Deutschen Ornithologen-Gesellschaft 1987

Authors and Affiliations

  • Robert C. Beason
    • 1
  1. 1.Biology DepartmentState University of New York at GeneseoGeneseoUSA

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