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The bird fauna of the isolated arid Andean valley of the upper río Patia, southwestern Colombia, resembles that of the Cauca Valley to the north.  The most prominent faunal element are widely distributed nonforest birds of the Tropical Zone which entered the Andean valleys of Colombia from the Caribbean lowlands to the north. The relations between the upper Patía fauna and the nonforest fauna of western Ecuador to the south are very restricted e.g. Veniliornis callonotus. Montane species of the Upper Tropical Subtropical Zone that inhabit the upper Patía Valley include the antshrike Thamnophilus multistriatus, the nightingale-thrush Catharus aurantiirostris, the warbler Basileuterus culiciuorus and others.  Some of the Patía populations differ from conspecific Cauca Valley populations by paler plumage coloration reflecting the arid climate of the restricted mountain valley of the upper río Patía, especially those of Forpus conspicillatus and Catharus aurantiirostris. However, these differences together with the c1inal nature of the geographical variation do not warrant taxonomic recognition as separate subspecies., The bird fauna of the isolated arid Andean valley of the upper río Patia, southwestern Colombia, resembles that of the Cauca Valley to the north.  The most prominent faunal element are widely distributed nonforest birds of the Tropical Zone which entered the Andean valleys of Colombia from the Caribbean lowlands to the north. The relations between the upper Patía fauna and the nonforest fauna of western Ecuador to the south are very restricted e.g. Veniliornis callonotus. Montane species of the Upper Tropical Subtropical Zone that inhabit the upper Patía Valley include the antshrike Thamnophilus multistriatus, the nightingale-thrush Catharus aurantiirostris, the warbler Basileuterus culiciuorus and others.  Some of the Patía populations differ from conspecific Cauca Valley populations by paler plumage coloration reflecting the arid climate of the restricted mountain valley of the upper río Patía, especially those of Forpus conspicillatus and Catharus aurantiirostris. However, these differences together with the c1inal nature of the geographical variation do not warrant taxonomic recognition as separate subspecies.

Tipo de documento: Artículo - Article

Palabras clave: Botánica, Zoología, Ecología, Biodiversidad, Conservación, Arqueología, Ciencias Naturales, Historia Natural, Paleobotánica, Paleozoología, Ornitología, Bird fauna, Avifauna, Nonforest bird, Forpws conspicillaius, Catharus auraniiirosiris, Avifauna, Forpus conspicillatus, Catharus aurantiirostris, Basileuterus culiciuorus





Fuente: http://www.bdigital.unal.edu.co


Introducción



ON THE AVIFAUNA OF THE UPPER PATIA VALLEY, SOUTHWESTERN COLOMBIA by J URGEN HAFFER * ABSTRACT The bird fauna of the isolated arid Andean valley of the upper rio Patia, southwestern Colombia, resembles that of the Cauca Valley to the north. The most prominent faunal element are widely distributed nonforest birds of the Tropical Zone which entered the Andean valleys of Colombia from th~ Caribbean lowlands to the north.
The relations between the upper Patia fauna and the nonforest fauna of western Ecuador to the south are very restricted (e.g.
Veniliornis callonotus).
Montane species of the Upper Tropical Subtropical Zone that inhabit the upper Patia Valley include the antshrike Thamnophilus multistriatus, the nightingale-thrush Catharus aurantiirostris, the warbler Basileuterus culiciuorus and others. Some of the Patia populations differ from conspecific Cauca Valley populations by paler plumage coloration reflecting the arid climate of the restricted mountain valley of the upper rio Patia, especially those of F orpws conspicillaius and Catharus auraniiirosiris.
However, these differences together with the c1inal nature of the geographical variation do not warrant taxonomic recognition as separate subspecies. INTRODUCTION Deep tropical valleys separate the northern Andean cordilleras of Colombia.
The climate of these valleys is comparatively dry, as the humidity is caught by the surrounding mountains; the vegetation is correspondingly sparse and often xerophytic.
Such valleys are the large upper Magdalena Valley bet ween the Eastern and Central Andes, the upper Patia Valley and portions of the Cauca Valley located between the Colombian Central and Western Andes. * Tomesweg 60, 4300 Essen-I, Federal Republic of Germany. 534 CALDASIA, VOL. XV, Nos.
71-75 OCTUBRE 30 DE 1986 CTJAll-lAN (1917) and HAUER (1967) discussed some aspects of the avifauna of these arid -pockets- in the generally humid northern Andes and -tILLER (1947, 1952) gave a detailed a...






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