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Related Experiment Videos

Lunar orientation in a beetle.

Marie Dacke1, Marcus J Byrne, Clarke H Scholtz

  • 1Department of Cell and Organism Biology, University of Lund, Helgonavägen 3, 223 62 Lund, Sweden. marie.dacke@cob.lu.se

Proceedings. Biological Sciences
|April 23, 2004
PubMed
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Dung beetles use the moonlit sky's polarization pattern, not the moon itself, for navigation. This nocturnal celestial orientation relies on polarized light cues, similar to diurnal insects.

Area of Science:

  • Animal behavior
  • Insect navigation
  • Polarized light

Background:

  • Many animals use celestial polarization patterns for orientation.
  • Scarabaeus zambesianus (dung beetle) is uniquely known to use the moon's dimmer polarization pattern for nocturnal navigation.
  • Previous research suggests polarized skylight detection is similar in diurnal and nocturnal insects.

Purpose of the Study:

  • To investigate the relative importance of the moon and its associated nocturnal polarized-light pattern for dung beetle orientation.
  • To determine if the moon disc or the polarization pattern is the primary cue for Scarabaeus zambesianus navigation.

Main Methods:

  • Manipulated the moon's position and visibility in the dung beetle's field of view.
  • Observed and analyzed the beetle's orientation performance under altered conditions.

Related Experiment Videos

  • Measured polarization sensitivity ratios in the dorsal eye photoreceptors.

    • Main Results:

    • Altering the moon's position or obscuring the moon disc did not significantly affect the beetle's orientation.
    • The polarization pattern around the moon was identified as the effective cue for orientation.
    • Polarization sensitivity ratios (7.7 and 12.9) in dorsal eye photoreceptors are comparable to diurnal navigators.

    Conclusions:

    • The moon itself is not the primary cue for Scarabaeus zambesianus orientation; the polarized-light pattern is crucial.
    • Nocturnal navigation using polarized skylight is as effective as diurnal navigation.
    • The findings support the hypothesis of similar polarized skylight detection mechanisms across diurnal and nocturnal insects.