La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	To think of swim: does it really cost penguins more to waddle?
Auteurs :	R. P. Wilson, Auteur ; M. A. M. Kierspel, Auteur ; J. A. Scolaro, Auteur ; S. Laurenti, Auteur ; J. Upton, Auteur ; H. Gallelli, Auteur ; E. Frere, Auteur ; P. Gandini, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (30(2) JUN 1999)
Article en page(s) :	221-224
Langues:	Anglais
Résumé :	We looked at the routes taken by Magellanic Penguins up the beach while moving between the sea and the colony at a breeding site in San Julian, Argentina. Birds swam parallel to the shore for a period before leaving the water to cross the beach hut trajectories over the beach were not perpendicular to the water's edge but at an angle of 39 degrees. We examined the premise that birds might be optimizing for a trade off between time or energy by adopting this procedure and found that birds can gain little or no time by walking obliquely but can, under particular circumstances, save energy. These circumstances require that the previously-calcutated costs of transport for walking have been over-estimated by a factor of two.

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