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Sooretama Slaty-antshrike Thamnophilus ambiguus

Justification
This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: http://www.museum.lsu.edu/~Remsen/SACCBaseline.html.

Taxonomic note
Thamnophilus punctatus (Sibley and Monroe 1990, 1993) has been split into T. punctatus and T. atrinucha following AOU (1998) and T. stictocephalus, T. sticturus, T. pelzelni and T. ambiguus following SACC (2005).

Distribution and population
This species has a large range in coastal south-east Brazil, extending inland in Minas Gerais along the Rio Doce Valley.

Population justification
The global population size has not been quantified, but it is believed to be large as the species is described as fairly common in at least parts of its wide range (Zimmer and Isler 2003).

Trend justification
This population is suspected to be stable in the absence of evidence for any declines or substantial threats.

References
Zimmer, K. J.; Isler, M. L. 2003. Family Thamnophilidae (typical antbirds). In: del Hoyo, J.; Elliott, A.; Christie, D.A. (ed.), Handbook of birds of the world, pp. 448-592. Lynx Edicions, Barcelona, Spain.

Text account compilers
Pilgrim, J.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Thamnophilus ambiguus. Downloaded from http://www.birdlife.org on 12/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 12/07/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Thamnophilidae (Antbirds)
Species name author Swainson, 1825
Population size Unknown mature individuals
Population trend Stable
Distribution size (breeding/resident) 210,000 km2
Country endemic? Yes
Links to further information
- Additional Information on this species