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Stellar performance : Mechanisms underlying milky way orientation in dung beetles

Author:
  • James J. Foster
  • Basil el Jundi
  • Jochen Smolka
  • Lana Khaldy
  • Dan Eric Nilsson
  • Marcus J Byrne
  • Marie Dacke
Publishing year: 2017-04-05
Language: English
Publication/Series: Royal Society of London. Philosophical Transactions B. Biological Sciences
Volume: 372
Issue: 1717
Document type: Journal article
Publisher: Royal Society

Abstract english

Nocturnal dung beetles (Scarabaeus satyrus) are currently the only animals that have been demonstrated to use the Milky Way for reliable orientation. In this study, we tested the capacity of S. satyrus to orient under a range of artificial celestial cues, and compared the properties of these cues with images of the Milky Way simulated for a beetle’s visual system. We find that the mechanism that permits accurate stellar orientation under the Milky Way is based on an intensity comparison between different regions of the Milky Way. We determined the beetles’ contrast sensitivity for this task in behavioural experiments in the laboratory, and found that the resulting threshold of 13% is sufficient to detect the contrast between the southern and northern arms of the Milky Way under natural conditions. This mechanism should be effective under extremely dim conditions and on nights when the Milky Way forms a near symmetrical band that crosses the zenith. These findings are discussed in the context of studies of stellar orientation in migratory birds and itinerant seals.

Keywords

  • Zoology
  • Sky compass
  • Star
  • Straight-line orientation
  • Vision

Other

Published
  • Lund Vision Group
  • ISSN: 0962-8436
Dan-E Nilsson
E-mail: dan-e.nilsson [at] biol.lu.se

Professor

Functional zoology

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+46 70 623 10 64

B-B312

4

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Lund Vision Group

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