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NUITFRANCE - Bibliothèque - Fiche bibliographique
Bibliothèque
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Document " The role of vision in the seafinding orientation of the green turtle (Chelonia mydas) "
Type de document : |
Articles de revue scientifique |
Thème du document : |
Nuit naturelle - Sens et orientation du vivant |
Groupe biologique : |
Reptiles |
Auteur(s) : |
EHRENFELD D.W.
CARR A.
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Date de publication : |
Janvier 1967 |
Langue : |
English/Anglais |
Nom du périodique : |
Animal behaviour |
Précisions : |
Volume 15. Numéro 1. Pages 25-36 |
Lien contenu/source : |
http://www.sciencedirect.com/science/article/pii/S... |
DOI : |
10.1016/S0003-3472(67)80007-1 |
Citation courte : |
Ehrenfeld & Carr (1967) |
Citation complète (format NuitFrance) : |
EHRENFELD D.W. & CARR A. (1967). The role of vision in the seafinding orientation of the green turtle (Chelonia mydas). Animal behaviour. Volume 15. Numéro 1. Pages 25-36. |
Résumé du document : |
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Two tests of sea-finding orientation were used to determine the nature of the visual cues that guide green turtles to the sea after hatching or nesting. The orientation performance, in day-light, during 143 trials with adult female turtles was evaluated quantitatively while they were wearing spectacles containing different filters; and a total of 525 hatchlings was tested at various times of day and night in a circular arena near the sea, where direction preferences might be observed when the view of the horizon was unobstructed, or when it was blocked by a low wall.
Blindfolded turtles were unable to find the sea except by chance; their performance was worse than that of any other group. Red, blue, and 0·4 neutral density filters significantly decreased orientation scores. Turtles with green filters, and those with neutral density filters and depolarizing-diffusing filters to which the animals had been pre-adapted, were able to orient as well as control animals with clear filters.
Hatchlings placed in the low-walled arena headed in a landward direction nearly 50 per cent of the time despite a clear view of the sky. Sea-finding orientation was highly successful in the unwalled arena during both day and night, although there was no direct view of the sea. Theere was little correlation between hatchling direction preferences and the pattern of light intensity in the sky above the horizon, as measured by a photometer.
Some conclusions based upon these results are as follows:
1. Sea-finding orientation is primarily a visual process.
2. There was no evidence of an ‘innate’ compass direction preference based on celestial information.
3. A direct view of the sea or surf is not necessary for seaward orientation of either adults or hatchlings.
4. Light polarized by reflection from the surface of the sea is not used as a primary orienting stimulus when the water, itself, is not in sight.
5. Orientation is not impaired when the details of visual images are blurred by a diffusing filter.
6. It is unlikely that true colour preference forms the behavioural basis of the sea-finding guidance system. The results of the spectacle experiments with colour filters may be interpreted to mean that marine turtles are less sensitive to red light than are fresh-water turtles.
7. The principal sea-finding process is visual inspection of the beach horizon and landscape features. It is not clear whether an avoidance of dark areas or an attraction to open, brighter portions of the beach is involved; the two may co-exist, and further studies are necessary to resolve the problem. A comparison of our results with those of previous studies suggests that fresh water and marine turtles have solved the problem of water-finding in the same way.
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Saisie sur NuitFrance par : |
Rosor |
Saisie sur NuitFrance en : |
Décembre 2017 |
Identifiant NuitFrance : |
NF-BIBLI-1862 |
Permalien de la fiche NuitFrance : |
http://www.nuitfrance.fr/?page=donneesdoc&partie=fiche-bibliographique&id_doc=1862 |
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