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Steinbach's Canastero Pseudasthenes steinbachi Scientific name definitions

J. V. Remsen, Jr.
Version: 1.0 — Published March 4, 2020
Text last updated September 19, 2019

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Introduction

The Steinbach’s Canastero has also been known as the Chestnut Canastero. It is endemic to Argentina; found from Salta in the north to Mendoza in the south. Its abundance appears to be greater in the southern half of its range. Recent molecular evidence suggests that this along with three other species should be separated into the genus Pseudasthenes as they are not closely related to true Asthenes canasteros. In parts of Argentina the Steinbach’s may be present sympatrically with the Creamy-breasted Canastero (Asthenes dorbignyi); the Steinbach’s shows a grey crown and back, and strongly rufous tones to the rear half of the bird, the outer edge of the tail (at least two feathers) are entirely rufous, and other rectrices are edged in rufous at their bases. The Steinbach’s Canastero is found in shrubby lower slopes of the Argentine Andes, as well as inter-andean rainshadow valleys. It is a poorly known species.

Field Identification

15–16 cm; 14–20 g. Rather greyish canastero lacking streaks and throat patch. Has mostly greyish-brown face , paler supercilium; crown and back dull grey-brown, greyest on nape, blending to chestnut rump and rufous-chestnut uppertail-coverts; wings mostly rufous, distal halves of remiges dark fuscous; tail graduated, central rectrices gradually tapering to slightly pointed tips, outer feathers rufous, rest blackish fuscous with rufescent margins on outer webs; chin and throat whitish with faint dusky tips, breast and belly greyish, flanks and undertail-coverts tawny-rufous; iris brown to dark brown; bill black to dark brown; tarsus and toes brown to black. Sexes alike. Juvenile undescribed.

Systematics History

Recent DNA analysis (1) indicates that present species is sister to P. cactorum, these two together in turn being sister to P. patagonica. See also P. humicola (above). Race neiffi of Asthenes baeri originally described as a race of present species. Monotypic.

Subspecies

Monotypic.

Distribution

Andes of W Argentina from W Salta S to Neuquén and Río Negro (2).

Habitat

Arid montane scrub, often in ravines, and monte woodland; 500–3000 m.

Movement

Mainly resident; some post-breeding downslope movement.

Diet and Foraging

Little known. Solitary or in pairs; presumably gleans arthropods from ground or low vegetation.

Sounds and Vocal Behavior

Not described.

Breeding

Season presumably during austral spring-summer; eggs in Nov and Jan. Presumably monogamous. Nest is a globular mass c. 34 cm tall and 28 cm wide, made of sticks, mostly thorny ones, entrance on upper side leads to interior nest chamber lined with grasses, soft plant matter, and feathers; 2–5 m up in bush. Clutch 2–3 eggs.
Not globally threatened. Currently considered a species of Lower Risk/Least Concern. Restricted-range species: present in High Andes of Bolivia and Argentina EBA. Rare to uncommon. In some parts of range, scrub habitat has been altered by human settlement and conversion to agriculture; grazing by domestic livestock possibly also a threat locally. On other hand, large areas of habitat throughout range remain in suitable condition.
Distribution of the Steinbach's Canastero - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Steinbach's Canastero

Recommended Citation

Remsen, Jr., J. V. (2020). Steinbach's Canastero (Pseudasthenes steinbachi), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.stecan1.01
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