Rayadito de Masafuera

Identificación

The Masafuera rayadito is 14 to 15 cm (5.5 to 5.9 in) long. The sexes have the same plumage. Adults have a poorly defined buff-brown supercilium on a dusky face. Their forehead is whitish with narrow rufous streaks and their crown is dark dusky brown. Their back is dull brown and their rump rufous-brown. Their wing coverts are blackish with tawny tips and their flight feathers are blackish with dull rufous bases. Their tail is mostly rufous with blackish bases on all but the central pair of feathers; the ends of the feathers lack barbs, giving a spiny appearance. Their throat is whitish, their breast and belly dull buffy gray-brown with a rufescent tinge, and their flanks and undertail coverts rufescent. Their iris is brown, their maxilla horn-brown or yellowish white with a horn tinge, their mandible yellowish horn, and their legs and feet horn-gray.

Taxonomía

The Masafuera rayadito is monotypic. It shares genus Aprrastura with the thorn-tailed rayadito (M. spinicauda) of the South American mainland. They are thought to have diverged in the Pleistocene.

Nombre científico

Aphrastura masafuerae

Autoridad

(Philippi & Landbeck, 1866)

Orden

Passeriformes

Familia

Furnariidae

Género

Aphrastura

Distribución y hábitat

The Masafuera rayadito is found only on Alejandro Selkirk Island in the Juan Fernández Archepeligo, about 670 km (360 nmi; 420 mi) off the coast of Chile. It inhabits thick undergrowth in semi-humid to humid montane scrub and also wooded areas with much Dicksonia externa tree fern. It often occurs along streams, and often in stands of the canelo tree Drimys confertifolia. In elevation it usually occurs between 800 and 1,300 m (2,600 and 4,300 ft) but occasionally goes as low as 400 m (1,300 ft) in the austral winter.

Migración

Resident species

Comportamiento

The Masafuera rayadito is mostly resident but makes some downslope movement in winter.<p>The Masafuera rayadito's diet is not well known, but is probably mostly arthropods. It almost always forages in pairs, usually in the understorey but sometimes in leaf litter on the ground. It feeds often on ferns, sometimes hanging upside down as it gleans from fronds. It also hunts in moss and lichens on the canelo tree.<p>The Masafuear rayadito's breeding season includes at least December and January. It makes a nest of plant fibers in a natural cavity on a cliff face, and also in nest boxes provided by humans. The clutch size, incubation period, and time to fledging are not known. Both parents provision nestlings.<p>As of September 2023, neither xeno-canto nor the Cornell Lab of Ornithology's Macaulay Library had any recordings of Masafuera rayadito vocalizations. Its call is described as "a low churring 'trrrt' c. 1·2 seconds long, singly or repeated".

Conservación

Tendencia poblacional

stable