La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Stomach content and grit ingestion by Rook Corvus frugilegus nestlings (2009)
Auteurs :	Grzegorz Orlowski, Auteur ; Zbigniew Kasprzykowski, Auteur ; Zbigniew Zawada, Auteur ; Grzegorz Kopij, Auteur
Type de document :	Article
Dans :	Ornis Fennica (86(4) 2009)
Article en page(s) :	117-122
Langues:	Anglais
Résumé :	Stomach content was examined in 53 out of 56 dead Rook Corvus frugilegus nestlings found in several breeding colonies in Poland. The stomachs contained 29 different types of items, 46.5% of which were animal, 12.2% plant and 41.2% mineral (small stones, sand and brick fragments). Imagi and larvae of Coleoptera were the most common animal prey (40% of all food items). Small stones and brick fragments were recorded in 27 (48%) chicks and their number per stomach ranged from I to 60 (average +/-95%Cl = 9.0 +/-3.8-14.1). Statistically significant positive correlation was detected between the chick weight and the number of grit particles found in the stomach.

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