La Tour du Valat

Article

Optimal bird migration and predation risk: a field experiment with northern wheatears Oenanthe oenanthe

H. Schmaljohann, Auteur ; V. Dierschke, Auteur

Dans Journal of Animal Ecology (74(1) JAN 2005)

1. Experiments testing predictions of optimal migration theory so far have concentrated on time and energy as the expenses that birds strive to minimize during migration. Taking advantage of the high variation in numbers of migrating raptors ove[...]

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Article

The Sahara Desert: a vast stopover site for migrating passerines?

H. Schmaljohann, Auteur ; F. Liechti, Auteur ; B. Bruderer, Auteur

Dans Journal of Ornithology (147(5, Suppl. 1) AUG 2006)

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Article

Time allocation in migrating Northern Wheatears (Oenanthe oenanthe) during stopover: is refuelling limited by food availability or metabolically?

V. Dierschke, Auteur ; J. Delingat, Auteur ; H. Schmaljohann, Auteur

Dans Journal of Ornithology (144(1) 2003)

According to full-day observations (scan sampling), Northern Wheatears (Oenanthe -oenanthe ) stopping over on the island of Helgoland (SE North Sea) during spring and autumn migration spent 51 - 67 % of the daylight period foraging. Large parts [...]

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