• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2022	Least Concern
2016	Near Threatened	A2c+3c+4c;B1ab(i,ii,iii,v);C1+2a(i)
2012	Near Threatened	A2c+3c+4c;B1ab(i,ii,iii,v);C1+2a(i)
2008	Near Threatened	A2c; A3c; A4c; B1a+b(i,ii,iii,v); C1; C2a(i)
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	92,600 km2	medium
Area of Occupancy (breeding/resident)	24,000 km2
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	10000-19999 mature individuals	poor	inferred	2022
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	3.9 years	-	-	-
Number of subpopulations	5-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The global population size has not been quantified, but this species is described as 'uncommon' (Stotz et al. 1996). Tentatively assuming that the species occurs at the same density as a congener (G. varia: 3 mature individuals/km²; Santini et al. 2018) and further assuming that 25% of forested habitat within the range is occupied to account for its rarity (i.e., c. 4,500 km²), the population may number 13,500 mature individuals. To account for uncertainty, it is here placed in the band 10,000-19,999 mature individuals, but an exact population estimate is urgently required.

Trend justification: The species is feared to be in slow decline as a consequence of habitat loss and degradation. Within the range, tree cover is lost at a rate of 2% over three generations (11.7 years; Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). As the species appears to show at least some tolerance of secondary growth (see Schulenberg and Kirwan 2021), population declines are unlikely to be fast; they are here tentatively placed in the band 1-9% over three generations.

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

Country/Territory	IBA Name
Peru	Abra Patricia - Alto Mayo
Peru	Cordillera de Colán

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1560 - 3580 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Causing/Could cause fluctuations		Medium Impact: 6
		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
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Causing/Could cause fluctuations		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Chestnut Antpitta Grallaria blakei. Downloaded from https://datazone.birdlife.org/species/factsheet/chestnut-antpitta-grallaria-blakei on 23/11/2024.
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 23/11/2024.