NT
Unicolored Antwren Myrmotherula unicolor



Taxonomy

Taxonomic note

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

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Near Threatened A2c+3c+4c;C1+2a(i)
2012 Near Threatened A2c+3c+4c;C1+2a(i)
2008 Near Threatened A2c; A3c; A4c; C1; C2a(i)
2004 Near Threatened
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Land-mass type - continent
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 237,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 10000-19999 poor estimated 2007
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 10-19 - - -
Decline (10 years/3 generation past and future) 10-19 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 5.1 - - -

Population justification: Based on the discovery of additional localities and an improved understanding of its range and status, the population is now estimated to exceed 10,000 individuals (Birdlife International 2007).

Trend justification: Although data on population trends are lacking, moderate declines are suspected to be on-going, owing to rates of habitat loss and degradation within the range.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Brazil N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Brazil Área de Proteção Ambiental de Guaratuba
Brazil Baía da Babitonga
Brazil Bertioga
Brazil Estação Ecológica de Juréia-Itatins
Brazil Guaraqueçaba / Jacupiranga / Cananéia
Brazil Ilha Grande
Brazil Itanhaém / Mongaguá
Brazil Maciço Florestal de Paranapiacaba
Brazil Maciços da Tijuca e Pedra Branca
Brazil Parque Estadual da Serra do Mar (entre Caraguatatuba e Picinguaba)
Brazil Parque Estadual da Serra do Mar (entre Pedro de Toledo e Cubatão)
Brazil Parque Estadual da Serra do Mar (entre Santos e São Sebastião)
Brazil Parque Estadual do Desengano e Entorno
Brazil Região dos Aparados da Serra
Brazil Reserva Biológica de Poço das Antas
Brazil Reserva Biológica União
Brazil Rio Guaraguaçu
Brazil Salto do Piraí
Brazil Serra da Bocaina / Paraty / Angra dos Reis
Brazil Serra do Marumbi
Brazil Serra do Tabuleiro State Park (Parque Estadual da Serra do Tabuleiro IBA)
Brazil Serra do Tinguá
Brazil Serra dos Órgãos

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry major resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Savanna Dry suitable resident
Altitude 0 - 500 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines
Stresses
Ecosystem degradation
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2017) Species factsheet: Myrmotherula unicolor. Downloaded from http://www.birdlife.org on 16/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/12/2017.