La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[Snails (Gastropoda) in the diet of Pied Flycatcher (Ficedula hypoleuca) nestlings.]
Auteurs :	Walter Wimmer, Auteur ; Wolfgang Winkel, Auteur
Type de document :	Article
Dans :	Vogelwarte (41(1) Oktober, 2001)
Article en page(s) :	70-80
Langues:	Allemand
Résumé :	The snail component in the diet of Pied Flycatcher (Ficedula hypoleuca) nestlings was examined during the year 2000 in eight study areas in Lower Saxony/Germany by using the neck-ring method and analysing food remains and pellets from the nests. The most effective method to evaluate the occurrence of snails in the diet was the collection of food remains. Hereby the snail component amounted between 0.5% and 6.9% in the different areas. In total 354 specimens of eleven snail species belonging to seven snail families could be proved. The most abundant species were Perpolita hammonis (175 specimens), Euconulus fulvus (55), Aegopinella nitidula (38), and Discus rotundatus (33). The appearance and dominance of the different species depend on the respective type of woodland. The smallest species were Columella aspera and Vertigo pygmaea, whereas Cepaea nemoralis (juveniles and shell fragments) was the largest. In pellets only fragments of larger snails/snails with thicker shell could be found. Thin-coated shells will obviously be digested completely.

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