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Related Experiment Videos

Polarized light helps monarch butterflies navigate.

Steven M Reppert1, Haisun Zhu, Richard H White

  • 1Department of Neurobiology, University of Massachusetts Medical School, LRB-728, 364 Plantation Street, Worcester, MA 01605, USA. steven.reppert@umassmed.edu

Current Biology : CB
|January 24, 2004
PubMed
Summary

North American monarch butterflies use polarized skylight for navigation. Manipulating polarized light in experiments altered their flight direction, confirming its role in their sun compass.

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Area of Science:

  • Animal Behavior
  • Sensory Ecology
  • Insect Navigation

Background:

  • North American monarch butterflies undertake long-distance migrations.
  • They rely on a time-compensated sun compass for orientation to overwintering sites.
  • The specific sunlight parameters utilized by their sun compass are not fully understood.

Purpose of the Study:

  • To investigate the role of polarized skylight as an orientation parameter in monarch butterfly migration.
  • To determine if manipulating polarized light affects monarch butterfly flight direction.

Main Methods:

  • Monarch butterflies were tested in an outdoor flight simulator.
  • A linear polarizing filter was used to manipulate the e-vector (angle of polarized skylight).
  • Oriented flight responses were recorded in both morning and afternoon trials.

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Main Results:

  • Manipulation of the e-vector predictably altered the direction of oriented flight in monarch butterflies.
  • Butterflies exhibited similar responses to filter rotation regardless of whether tested in the morning or afternoon.
  • Monarch butterflies possess anatomical structures (dorsal photoreceptors) consistent with polarized light detection.

Conclusions:

  • Polarized skylight serves as a relevant orientation parameter for monarch butterfly navigation.
  • Polarized light detection provides a critical input pathway for the monarch sun compass.
  • This sensory mechanism allows for accurate navigation under diverse atmospheric conditions.