Multiple sources of celestial compass information in the Central Australian desert ant Melophorus bagoti
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The Central Australian desert ant Melophorus bagoti is known to use celestial cues for compass orientation. We manipulated the available celestial cues for compass orientation for ants that had arrived at a feeder, were captured and then released at a distant test site that had no useful terrestrial panoramic cues. When tested in an enclosed transparent box that blocked some or most of the ultraviolet light, the ants were still well oriented homewards. The ants were again significantly oriented homewards when most of the ultraviolet light as well as the sun was blocked, or when the box was covered with tracing paper that eliminated the pattern of polarised light, although in the latter case, their headings were more scattered than in control (full-cue) conditions. When the position of the sun was reflected 180° by a mirror, the ants headed off in an intermediate direction between the dictates of the sun and the dictates of unrotated cues. We conclude that M. bagoti uses all available celestial compass cues, including the pattern of polarised light, the position of the sun, and spectral and intensity gradients. They average multiple cues in a weighted fashion when these cues conflict.
KeywordsDesert ant Compass Polarised light Ultraviolet Navigation
We thank two anonymous reviewers for helpful comments, Martin Whiting for providing us photospectrometric measurements, the Centre for Appropriate Technology for letting us work on their grounds and for providing storage space, and the CSIRO at Alice Springs for letting us rent a house and providing some administrative help. Funding for the work came from the Australian Research Council (Discovery Project Grant DP110100608) and from Macquarie University (postgraduate awards to AW, SS, PS).
Conflict of interest
The authors declare that they have no conflicts of interest.
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