La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Foraging and flocking behaviour of migrating and resident frugivorous songbirds
Auteurs :	A. Hampe, Auteur ; F. Bairlein, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (141(3) JUL 2000)
Article en page(s) :	300-308
Langues:	Anglais
Résumé :	Migrating birds that arrive at unknown stopover sites have to satisfy greater nutritive demands in restricted time and simultanously run a higher predation risk than residents which are familiar with the area. Foraging behaviour of resident and migrant frugivores feeding on fruits of Alder Buckthorn (Frangula alnus) was studied in Germany and Spain. German trees ripen their fruits during the autumn migration period, Spanish ones during the breeding and early postbreeding season. In both areas fruits were mainly eaten by Sylvia warblers, Robin (Erithacus rubecula) and thrushes (Turdus sp.). At the stopover site birds spent less time in the tree, consumed more fruits per visit and therefore foraged more efficiently. In both areas birds clearly synchronized foraging bouts and formed intra- and interspecific assemblages, which were more frequent in migrants than in residents on the interspecific level. The influence of nutritive demands and predator avoidance upon the foraging behaviour and its consequences for seed dispersal are discussed.

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