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NUITFRANCE - Bibliothèque - Fiche bibliographique
Bibliothèque
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► Fiche bibliographique
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Document " How a Harbor seal sees the night sky "
Type de document : |
Articles de revue scientifique |
Thème du document : |
Nuit naturelle - Sens et orientation du vivant |
Groupe biologique : |
Mammifères hors humains et chauves-souris |
Auteur(s) : |
MAUCK B. BROWN D. SCHLOSSER W. SCHAEFFEL F. DEHNHARDT G.
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Date de publication : |
Octobre 2005 |
Langue : |
English/Anglais |
Nom du périodique : |
Marine Mammal Science |
Précisions : |
Volume 21. Numéro 4. Pages 646–656 |
Lien contenu/source : |
http://onlinelibrary.wiley.com/doi/10.1111/j.1748-... |
DOI : |
10.1111/j.1748-7692.2005.tb01257.x |
Mots-clefs : |
Astronavigation Harbor seal Orientation Phoca vitulina Vision
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Citation courte : |
Mauck et al. (2005) |
Citation complète (format NuitFrance) : |
MAUCK B., BROWN D., SCHLOSSER W., SCHAEFFEL F. & DEHNHARDT G. (2005). How a Harbor seal sees the night sky. Marine Mammal Science. Volume 21. Numéro 4. Pages 646–656. |
Résumé du document : |
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Astronavigation is a possible mechanism of offshore orientation in marine mammals. However, the basic prerequisite for astronavigation is to see enough stars of the night sky. This cannot be taken for granted in seals as, due to adaptations of their dioptric apparatus to the optical properties of water, seals are supposed to be myopic and astigmatic when out of the water under low light conditions. Using various real and artificial stars in a go/no-go response paradigm we therefore determined the minimum brightness at which a harbor seal (Phoca vitulina) can detect stars. The dark-adapted seal was trained to look through an empty tube (“seal telescope”) and to retract its head only when a star appeared at the opposite aperture. The seal reliably detected Venus or Sirius becoming suddenly visible when the telescope was moved across the night sky. Detection thresholds were determined using artificial stars (parallel light identical to starlight coming from the universe) of predefined brightness generated by an optical system installed in front of the seal's telescope. The seal detected artificial stars down to 4.4 stellar magnitudes. Although these results cannot present evidence for astronavigation, they imply that seals should see enough stars to allow such orientation mechanisms.
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Saisie sur NuitFrance par : |
Rosor |
Saisie sur NuitFrance en : |
Mars 2016 |
Identifiant NuitFrance : |
NF-BIBLI-1521 |
Permalien de la fiche NuitFrance : |
http://www.nuitfrance.fr/?page=donneesdoc&partie=fiche-bibliographique&id_doc=1521 |
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