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Spectral information as an orientation cue in dung beetles
Basil El Jundi1, James J Foster2, Marcus J Byrne3
1Vision Group, Department of Biology, Lund University, 223 62 Lund, Sweden basil.el_jundi@biol.lu.se.
Biology Letters
|November 6, 2015
Summary
Dung beetles can use the sky's color gradient as a compass. They maintained their orientation using green or UV light cues, suggesting spectral information aids navigation.
Area of Science:
- Animal behavior
- Sensory ecology
- Insect navigation
Background:
- Celestial cues, like the sky's color gradient, are vital for animal orientation.
- Dung beetles (Scarabaeidae) primarily use celestial cues for navigation.
Purpose of the Study:
- To investigate if dung beetles utilize spectral information from light cues for orientation.
- To determine the role of monochromatic (green and UV) light in dung beetle navigation.
Main Methods:
- Experiments were conducted in an indoor arena using monochromatic green and UV light spots.
- Dung beetles' orientation was assessed when presented with single or multiple light cues.
- The beetles' ability to maintain bearing was tested when light cues were removed or duplicated.
Main Results:
- Beetles maintained their bearing with single green or UV light cues.
- Beetles also maintained bearing with two distinct light cues (green and UV) 180° apart.
- Orientation was impaired when presented with two identical green light spots, but maintained when one of two distinct cues was removed.
Conclusions:
- Dung beetles can use spectral information, specifically UV and green light, for orientation.
- The celestial chromatic gradient offers a potential navigational reference for dung beetles.
- Differential spectral cues are crucial for maintaining directional stability in dung beetle navigation.
