La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Annual variation and breeding success of a threatened insular population of Common Raven Corvus corax (Tenerife, Canary Islands)
Auteurs :	Manuel Siverio, Auteur ; Felipe Siverio, Auteur ; Beneharo Rodriguez, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (128(4) 2007)
Article en page(s) :	197-201
Résumé :	During 1996 and 2006 we studied the population size and breeding success of Common Raven in Teno massif, where the majority of Tenerife reproductive pairs reside. Breeding population size remained more or less stable during the study period, varying between four (2001) and nine (2005-2006) pairs. Fledging rate (fledged chicks/successful nests) in 2006 was 2.63 and eight of the nine pairs bred successfully (89% of the nests producing surviving offspring). During 1996-2005, the mean fledging rate of 36 broods randomly selected was 2.72. Implementation of a food supply program to increase the survival rate of non reproductive birds is needed urgently along with other conservation measures.

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