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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Body mass and fat scores of Palaearctic migrants at the southern fringe of the Sahara desert in autumn.
Auteurs :	Volker Salewski, Auteur ; Res Altwegg, Auteur ; Amadou Ba, Auteur ; Felix Liechti, Auteur ; Dieter Peter, Auteur
Type de document :	Article
Dans :	Vogelwarte (41(4) Dezember 2002)
Article en page(s) :	291-294
Langues:	Allemand
Résumé :	Mass and fat scores of Palearctic Trans-Saharan migrants are known in breeding grounds and migration routes north of the Sahara and partially in their winter quarters. However, there are no data from areas south of the Sahara desert. These data would be important in order to discuss optimal migration strategies because only data collected after an ecological barrier can offer insight in the obstacle's influence on energy use. We studied mass and fat scores of Palearctic migrants in an artificially created wood near the oasis of Tichit, Mauritania, on three consecutive days in September 2001. The most frequent species were European Turtle Dove (Streptopelia turtur) and Reed Warbler (Acrocephalus scirpaceus). Both species showed lowest body masses and fat scores compared with data in the literature. Other species studied confirmed this trend, but only a small number was captured. Moreover, many dead birds were found in the area, and some individuals were not afraid of humans in their search for feed and shade. The data on the birds' condition, together with their behavior, indicate that the crossing of the desert is an obstacle for migratory birds that pushes them towards their physiological limits.

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