||Myrmotherula grisea Carriker, 1935
||Ashy Antwren, Yungas Antwren
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
||10 cm. Small, arboreal, gleaning antwren showing strong sexual dimorphism. Male entirely uniform grey, with unmarked wing-coverts. Female olivaceous-brown above with more rufescent unmarked wings and tail and uniformly bright ochraceous underparts. Voice Series of eight loud but melancholic kíu or kee calls at same pitch and pace. Also harsh, chattery calls.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Fjeldså, J., Hennessey, A., Herzog, S., MacLeod, R. & Tobias, J.
||Capper, D., Mahood, S., Pople, R., Sharpe, C J, Stuart, T. & Symes, A.
This species's range and abundance have been recently studied, and it has been found to be more widely distributed and commoner than previously thought (Collar et al. 1992). It is no longer considered to have a small range and is found within large areas of intact primary forest. Its presence has been confirmed at more than 10 locations, and it is suspected to be undergoing only slow rates of population decline. For these reasons, it has been downlisted to Least Concern, as it can no longer be considered to approach the thresholds for Vulnerable under any of the IUCN criteria.
|Previously published Red List assessments:|
- 2015 – Least Concern (LC)
- 2013 – Least Concern (LC)
- 2012 – Least Concern (LC)
- 2008 – Near Threatened (NT)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Threatened (T)
|Range Description:||Myrmotherula grisea is restricted to the Yungas (east Andean foothills) of La Paz, Beni, Cochabamba and Santa Cruz, central and west Bolivia, and has recently been found in extreme south-west Puno, Peru (Herzog et al. 2008). In 2007 and 2009, birds were captured in the upper Urubamba Valley, Cusco, Peru, some 500 km north-west of this (Robbins et al. 2011). It occurs more or less continuously in suitable habitat across its range, and a recent study on Cordillera Mosetenes, which appears to hold over half the total population, estimated a density of 15 individuals per km2 (Herzog et al. 2008). |
Bolivia, Plurinational States of; Peru
|♦ Continuing decline in area of occupancy (AOO):||Yes|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||186000|
|♦ Continuing decline in extent of occurrence (EOO):||Yes||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Number of Locations:||24||♦ Continuing decline in number of locations:||Unknown|
|♦ Extreme fluctuations in the number of locations:||No||♦ Lower elevation limit (metres):||600|
|♦ Upper elevation limit (metres):||1500|
|Range Map:||Click here to open the map viewer and explore range.|