Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Areal structures of Tanagers in southwestern Columbia.
Auteurs :	Ralf Strewe, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (42(2) Mai 2003)
Article en page(s) :	111-146
Résumé :	Biogeographic studies of the areal structure and areal dynamics of Thraupinae were conducted over two years within the Endemic Bird Area Choco on the Pacific slope of the Westandes in the department Narino, Colombia. Thraupinae were selected, as a characteristic group of the avifauna of the Choco, distributed in all elevational zones on the Pacific slope of the Westandes and presenting a high portion of endemics. The studies were realised within an altidudinal gradient between 400 and 3200 m and included the vegetation zones of humid lowland, premontane and montane forest. The macrochorological categorisation of the 75 Thraupinae species registered within the study area resulted in six different areal types. The Andean areal type shows the highest portion with 48%, and 20% of the tanager species are endemic for the Choco. The Andean species are dominant in the premontane and montane elevation zone, while on the lower slopes and in the lowlands species of the trans-cisandean (16%), the Choco-Magdalena (3%) and the Choco-Caribbean (12%) areal type are characteristic. A significant distribution limit for the lowland species was registered at 500-600 m. The most important distribution limit for the premontane tanager species was identified in the elevation zone between 2300-2400 m within the transition zone of pluvial premontane and montane forests. Highest concentrations of Thraupinae species were found between 400 m and 1700-1800 m, with the maximum of 30 species at La Planada, resulting from the overlapping of the areal limits of lowland and premontane species. The endemic tanager species occur below 2300 m, with concentrations of eight species between 400-800 m and 1300-1600 m. The species specific elevation amplitudes for the study area reach from 400 to 1900 m. While species with small elevational amplitude (

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+