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NUITFRANCE - Bibliothèque - Fiche bibliographique
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Document " How dim is dim? Precision of the celestial compass in moonlight and sunlight "
Type de document : |
Articles de revue scientifique |
Thème du document : |
Nuit naturelle - Sens et orientation du vivant |
Groupe biologique : |
Invertébrés terrestres |
Auteur(s) : |
DACKE M. BYRNE M.J. BAIRD E. SCHOLTZ C.H. WARRANT E.J.
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Date de publication : |
Mars 2011 |
Langue : |
English/Anglais |
Nom du périodique : |
Philosophical Transactions of the Royal Society |
Précisions : |
Volume 366. Numéro 1565. Pages 697-702 |
Lien contenu/source : |
http://rstb.royalsocietypublishing.org/content/366... |
DOI : |
10.1098/rstb.2010.0191 |
Mots-clefs : |
Dung beetle Navigation Orientation Polarized light Vision
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Citation courte : |
Dacke et al. (2011) |
Citation complète (format NuitFrance) : |
DACKE M., BYRNE M.J., BAIRD E., SCHOLTZ C.H. & WARRANT E.J. (2011). How dim is dim? Precision of the celestial compass in moonlight and sunlight. Philosophical Transactions of the Royal Society. Volume 366. Numéro 1565. Pages 697-702. |
Résumé du document : |
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Prominent in the sky, but not visible to humans, is a pattern of polarized skylight formed around both the Sun and the Moon. Dung beetles are, at present, the only animal group known to use the much dimmer polarization pattern formed around the Moon as a compass cue for maintaining travel direction. However, the Moon is not visible every night and the intensity of the celestial polarization pattern gradually declines as the Moon wanes. Therefore, for nocturnal orientation on all moonlit nights, the absolute sensitivity of the dung beetle's polarization detector may limit the precision of this behaviour. To test this, we studied the straight-line foraging behaviour of the nocturnal ball-rolling dung beetle Scarabaeus satyrus to establish when the Moon is too dim—and the polarization pattern too weak—to provide a reliable cue for orientation. Our results show that celestial orientation is as accurate during crescent Moon as it is during full Moon. Moreover, this orientation accuracy is equal to that measured for diurnal species that orient under the 100 million times brighter polarization pattern formed around the Sun. This indicates that, in nocturnal species, the sensitivity of the optical polarization compass can be greatly increased without any loss of precision.
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Saisie sur NuitFrance par : |
Rosor |
Saisie sur NuitFrance en : |
Octobre 2014 |
Identifiant NuitFrance : |
NF-BIBLI-756 |
Permalien de la fiche NuitFrance : |
http://www.nuitfrance.fr/?page=donneesdoc&partie=fiche-bibliographique&id_doc=756 |
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