Antvireo plumbeo

Identificazione

The plumbeous antvireo is about 12 to 13 cm (4.7 to 5.1 in) long. Adult males have a dark gray head, upperparts, and tail with a hidden white patch between the scapulars. Their wings are black with white tips and edges on the coverts. Their underparts are a darker blackish gray than the upperparts. Adult females have an olive-brown head and upperparts with buff-white spots on the wing coverts. Their throat is very pale gray, their breast olive-brown, and their belly and crissum ochraceous.

Tassonomia

The plumbeous antvireo was originally described in genus Myiothera, which is no longer in use. It was eventually transferred to Dysithamnus but around 1970 was moved by at least one author to genus Thamnomanes. This treatment was not widely accepted and by the 1980s it was confirmed to belong in Dysithamnus.<p>The plumbeous antvireo and what is now the white-streaked antvireo (D. leucostictus) were for a time treated as conspecific; they were separated in the early 2000s. The plumbeous antvireo is monotypic.

Nome scientifico

Dysithamnus plumbeus

Autorità

(Wied-Neuwied, M, 1831)

Ordine

Passeriformi

Famiglia

Thamnophilidae

Genere

Dysithamnus

Areale e habitat

The plumbeous antvireo is found locally in southeastern Brazil in an area roughly bounded by southern Bahia, eastern Minas Gerais, Espírito Santo, and northern Rio de Janeiro states. It is a bird of the Atlantic Forest, where it inhabits the understory of evergreen forest. It occurs almost exclusively in primary or slightly disturbed forest and favors overgrown openings such as those created by fallen trees. In elevation it mostly occurs below 600 m (2,000 ft) but is found as high as 900 m (3,000 ft).

Migrazione

Resident species

Comportamento

The plumbeous antvireo is thought to be a year-round resident throughout its range.<p>The plumbeous antvireo's diet is not known in detail but is mostly insects and other arthropods. It usually forages singly or in pairs, and sometimes as part of a mixed-species feeding flock that passes through its territory. It typically feeds within about 2 m (7 ft) of the ground but sometimes to twice that height, and readily feeds on the ground. It feeds mostly while perched by gleaning from live leaves, vines, and twigs. It also probes dead leaf clusters.<p>The plumbeous antvireo's breeding season is thought to span August to December. The one known nest was 0.3 m (1 ft) above the ground in a small shrub. It contained two eggs that the female was incubating. Nothing else is known about the species' breeding biology.<p>The plumbeous antvireo's song is a "slow series of 6-8 evenly spaced, rising and falling, sad-sounding notes".

Conservazione

Tendenza della popolazione

declining