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

Taxonomic note

Thamnophilus bernardi and T. shumbae (del Hoyo and Collar 2016) were previously lumped as Sakesphorus bernardi following SACC (2005 & updates), Sibley & Monroe (1990, 1993) and Stotz et al. (1996).

 

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D1

Red List history

Year	Category	Criteria
2020	Vulnerable	D1
2019	Data Deficient
2016	Data Deficient
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	34 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	3,400 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	600-6000 mature individuals	poor	inferred	2020
Population trend	decreasing	-	suspected	2013-2024
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	3.6 years	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The species is described as fairly common, but the population size has not been quantified directly (del Hoyo et al. 2020). Based on the recorded population densities of congeners (Thamnephilus aethiops: 2 mature individuals/km² and T. schistaceus: 20 mature individuals/km² in Peru [Santini et al. 2018]) and tentatively assuming that only about 10% of the range is occupied, the population is estimated to fall in the band 600-6,000 mature individuals.

Trend justification: The population trend has not been quantified directly. The only threat known to this species is the loss and degradation of its habitat. Tree cover within the range has been lost at a rate of up to 4% over the past three generations (10.8 years; Global Forest Watch 2020). The species is not dependent on forest cover, but also occurs in scrubland and thickets, and seems to be able to tolerate a certain level of habitat degradation (del Hoyo et al. 2020). Therefore on a precautionary basis, it is suspected that the species is undergoing a slow decline, the rate of which is unlikely to exceed 10% over three generations.

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	suitable	resident
Shrubland	Subtropical/Tropical Dry	suitable	resident
Altitude	0 - 1000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
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, Ecosystem conversion

---

Recommended citation
BirdLife International (2024) Species factsheet: Maranon Antshrike Thamnophilus shumbae. Downloaded from https://datazone.birdlife.org/species/factsheet/maranon-antshrike-thamnophilus-shumbae on 26/12/2024.
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 26/12/2024.