La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Selection of breeding habitats by the Roller (Coracias garrulus) in farming areas of the southwestern Iberian Peninsula
Auteurs :	Jesus M. Aviles, Auteur ; Emilio Costillo, Auteur
Type de document :	Article
Dans :	Vogelwarte (39(4) Dec., 1998)
Article en page(s) :	242-247
Langues:	Allemand
Résumé :	The selection of breeding habitats by Rollers (Coracias garrulus) is analysed in the southwestern Iberian Peninsula. Rollers selected positively areas where two years set-aside occurs ("posios") with holm-oak trees, though this substrate was scarce in the area. However, this habitat showed most potential preys for this species as well as the largest preys. The species preferred areas with trees to those without them when all the available areas had the same food availability. The territories of Rollers were different to those of Kestrels, a competitor for nest sites in open areas. However, the Rollers did not show a statistically significant negative selection by Kestrel (Falco tinnunculus) territories. The major food availability, the major prey size in "posios" with holm-oak trees, as well as the existence of natural perches in this habitat are suggested as causal factors of the selection of breeding territories by Rollers.

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