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Related Experiment Videos

Magnetic information calibrates celestial cues during migration.

Sandberg1, Bäckman, Moore

  • 1Department of Animal Ecology, Lund University

Animal Behaviour
|October 18, 2000
PubMed
Summary

Migratory birds calibrate celestial and geomagnetic cues for navigation. Species differ in how they integrate magnetic fields and star compass information for orientation during migration.

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Area of Science:

  • Ornithology
  • Animal Behavior
  • Neuroethology

Background:

  • Migratory birds navigate using celestial and geomagnetic cues.
  • Cue-conflict experiments demonstrate calibration between these orientation systems.

Purpose of the Study:

  • To investigate calibration of orientation cues in four North American songbird species.
  • To identify species-specific differences in cue calibration.

Main Methods:

  • Autumn migratory orientation was assessed using cage tests and free-flight release tests.
  • Cage tests involved local and deflected magnetic fields at dusk.
  • Release tests evaluated star compass recalibration after magnetic field exposure.

Main Results:

Related Experiment Videos

  • Red-eyed vireos and northern waterthrushes calibrated magnetic fields, while indigo buntings and grey catbirds oriented to sunset.
  • All four species recalibrated their star compass based on prior magnetic field exposure.
  • Magnetic field calibration varied significantly between species.

    • Conclusions:

    • Songbirds demonstrate species-specific calibration of magnetic and celestial orientation cues.
    • The star compass is recalibrated by experienced magnetic fields for migratory orientation.
    • Magnetic cues likely play a crucial role in calibrating the star compass during twilight periods.