La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Prey selection by Great Cormorants Phalacrocorax carbo at the Lake of Constance.
Auteurs :	Bonnie Anna Klein, Auteur ; Manfred Lieser, Auteur
Type de document :	Article
Dans :	Vogelwarte (43(4) NOV 2005)
Article en page(s) :	267-270
Langues:	Allemand
Résumé :	In winter 2004/05, we collected 143 cormorant pellets under roost trees in the nature reserve "Radolfzeller Aachried" The fish consumed by the birds are supposed to originate from the Zeller See, the westernmost part of the Lake of Constance. We found the remains of 567 individual fish, 42 of which could not be determined. Seventeen out of 31 fish species occuring in the Lake of Constance were represented in the cormorant diet. Cyprinids comprised 40.6% of the individuals. The most important components were undetermined Cyprinids (19.6%), pike Esox lucius (15%), perch Perca fluviatilis (12.7%), carp Cyprinus carpio (12%) and ruffe Gymnocephalus cernuus (9.4%). The grayling Thymallus thymallus which is considered to be endangered by cormorant predation had a proportion of only 1.6%.

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