Détail de la notice
Titre du Document
RÉPARTITION DES DEUX ESPÈCES DE GRIMPEREAUX Certhia familiaris ET Certhia brachydactyla DANS LES PYRÉNÉES
The distribution of Common Treecreeper Certhia familiaris and Short-toed Treecreeper C. brachydactyla in the Pyrenees
Auteur(s)
CLOUET Michel ; JOACHIM Jean
Résumé
Records of the two sympatric treecreeper species Certhia familiaris and C. brachydactyla (n = 399) using song play-back were collected in spring (2004-2009) in 31 main stations dispatched east, west, north and south in the Pyrenees. Common Trecreeper account for 83 % of the records on the northern slope (n = 182), 46% of the records on the southern slope (n = 82) where its range was more contracted. It was lacking in easterm and western peripherical massifs. Mean altitude of records was 1,278m a.s.l. (470-2,025m; n = 264). Short-toed Treecreeper account for 36% of the records on the northern slope (n = 80), 79% of the records on the southern slope (n = 141 ) where its range was more expanded. Mean altitude was 1,189m a.s.l. (385-2,025m ; n = 220). On the northern slope, frequencies of both species were strongly negatively correlated along the altitudinal gradient resulting in the exclusive occurrence at high altitude of Common Treecreeper. On the southern slope the Short-toed Treecreeper was more frequent at all but one (1500-1700m a.s.l.) level and mainly at high altitudes. In pines forests of Central Pyrenees, species replaced each other from one slope to the other. A principal components analysis taking into account the habitat parameters underlines a strong opposition between species. Treecreeper is associated with the northern slope, and fir. Short-toed Treecreeper is linked to the southern slope. Distribution of the sympatric treecreepers is mainly depending of oceanic-
Editeur
Société d'études ornithologiques
Identifiant
ISSN : 0002-4619 CODEN : ALUDAI
Source
Alauda (Dijon) A. 2010, vol. 78, n° 2, pp. 137-148 [12 pages] [bibl. : 3/4 p.]
Langue
Français
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