VU
Brown-banded Antpitta Grallaria milleri



Taxonomy

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. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - B1ab(ii,iii)

Red List history
Year Category Criteria
2022 Vulnerable B1ab(ii,iii)
2016 Vulnerable B1ab(iii,v);C2a(i)
2013 Vulnerable B1ab(iii,v);C2a(i)
2012 Vulnerable B1ab(iii,v);C2a(i)
2008 Endangered B1a+b(iii,v)
2004 Endangered
2000 Endangered
1996 Endangered
1994 Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency medium
Land-mass type continent
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 18,200 km2 medium
Area of Occupancy (breeding/resident) 14,000 km2
Number of locations 6-10 -
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 10000-19999 mature individuals poor estimated 2014
Population trend decreasing poor suspected 2016-2028
Rate of change over the past 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 1-9% - - -
Generation length 4.06 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The species can locally reach high densities of 102 individuals/km2 (Kattan and Beltrán 1999, Renjifo et al. 2014). Assuming that about one-third of suitable habitat is occupied, the population was estimated at roughly 50,000 individuals (Renjifo et al. 2014), which equates to 33,000 mature individuals. This population size value is however described as a potential overestimate (Renjifo et al. 2014) and therefore precautionarily the population is here placed in the band 10,000-19,999 mature individuals.

Trend justification: A slow and ongoing population decline is suspected as a consequence of habitat loss. Within the range, tree cover is lost at a rate of 3% over three generations (12.2 years; Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Despite being restricted to forest, the species appears to tolerate some habitat degradation (Kattan and Beltrán 1999, Greeney 2020) and population declines are therefore tentatively placed in the band 1-9% over three generations.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Colombia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Alto Quindío
Colombia Bosques del Oriente de Risaralda
Colombia Cuenca del Río Toche
Colombia Páramos y Bosques Altoandinos de Génova
Colombia Reserva Hidrográfica, Forestal y Parque Ecológico de Río Blanco
Colombia Reserva Natural Ibanasca
Colombia Reservas Comunitarias de Roncesvalles

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 1460 - 3450 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2024) Species factsheet: Brown-banded Antpitta Grallaria milleri. Downloaded from https://datazone.birdlife.org/species/factsheet/brown-banded-antpitta-grallaria-milleri on 03/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 03/12/2024.