Troglodyte de Niceforo

Identification

A medium-sized wren, averaging 14.5-15cm in length. Adult birds are dull olive-grey on the head and mantle, becoming slightly more rufescent on the back. The wings are finely barred, with more broad barring on the tail. A long white supercilium is bordered behind the eye by fine black lines. The face is marked by black and white streaks. The underparts are white becoming greyish on the sides and flanks. The undertail coverts show broad black barring. Juvenile birds have not been described.

Taxonomie

Niceforo's wren was first formally described in 1946 by the American ornithologist Rodolphe Meyer de Schauensee. The genus name derives from the Ancient Greek thruon - reed, and philos - loving. The species name commemorates Brother Nicéforo María, a Colombian missionary and herpetologist who provided Meyer de Schauensee with many specimens.<p>The type-locality site is San Gil on the río Fonce south of Bucaramanga, in Santander, where ten specimens were collected between 1944 and 1948.<p>Previously considered part of the genus Thryothorus and frequently treated as a subspecies of Rufous-and-white wren (Thryophilus rufalbus), Niceforo's wren is currently regarded as a full species. It is monotypic - there are no recognized subspecies.

Nom scientifique

Thryophilus nicefori

Autorité

(Meyer de Schauensee, 1946)

Ordre

Passériformes

Famille

Troglodytidae

Genre

Thryophilus

Répartition et habitat

Niceforo's wren is endemic to the valley of the Chicamocha River, as well as the Sogamoso, Suaréz, and Fonce river basins. These locations are within the departments of Boyacá and Santander, in the central northern part of Colombia.<p>After the first specimens of Niceforo's wren were collected during the 1940s, no further sightings were recorded until two birds were seen in that area in 1989 and 2000. This may reflect the fact that this area was difficult to visit from the 1950s onward due to guerilla activity.<p>In 2005 Oswaldo Cortes and colleagues discovered a disjunct population in the area of Soatá, approximately 100km south of San Gill, and in 2004-06 Thomas M Donegan and colleagues discovered a population in the Serranía de los Yariguíes, about 50km to the west of San Gill.<p>This wren is found in dry forest at altitudes between 1132 and 1840m, in areas with abundant vegetation cover, a dense understory and abundant leaf litter. Its presence was found to be significantly correlated with that of Tricanthera gigantea, Acacia farnesiana, Sapindus saponaria and Pithecellobium dulce. A recent survey found populations of Niceforo's wren in riparian forest fragments with tangled vegetation composed by shrubs and thorn scrubs, and also along shaded edges of coffee and cacao plantations.

Migration

Resident species

Comportement

Niceforo's wren is a largely terrestrial species, being found mostly within 2.66m of ground level. They appear to forage for food mainly in leaf litter on the ground and have also been observed gleaning for arthropods under dry leaves and pecking on branches and tree holes.<p>It is a monogamous species. Pairs defend territories from 1 to 4 hectares along streams and rivers, and the maximum density has been calculated as one individual for every two hectares of habitat.<p>Niceforo's wrens construct an elbow-shaped nest with an entrance at one side of the top and a globular base. These nests are located between 3 and 10m above the ground, typically in trees of 12-16m in height. Nesting materials included vegetable fibers of Tillandsia usneoides, fungal rhizomorphs (Marasmius spp.), plant twigs, and vines, forming a very dense structure. As has been observed in two other species of Thryophilus wrens as well as some other tropical bird species, Niceforo's wrens construct their nests near wasp colonies, a strategy that increases the rate of offspring survival as the wasps deter predators.

Conservation

Tendance de la population

declining