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

Taxonomic note

Thryophilus sernai (del Hoyo and Collar 2016) is recognized as a species following work by Lara et al. (2012).

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
-	-	A3c+4c; B1ab(i,ii,iii,iv)

Red List history

Year	Category	Criteria
2022	Vulnerable	A3c+4c; B1ab(i,ii,iii,iv)
2016	Endangered	A3c+4c
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	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	6,360 km2
Area of Occupancy (breeding/resident)	3,640 km2
Number of locations	6-10	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	suspected	2021
Population trend	decreasing	-	suspected	2015-2025
Rate of change over the past 10 years/3 generations (longer of the two periods)	20%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	37%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	37%	-	-	-
Generation length	2.74 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population size has not been quantified. It may not be possible to make an overall population estimate based on the availability of habitat for breeding, because of the absence of this species in many areas where conditions seem to be suitable (O. Cortes-Herrera in litt. 2016). It is here tentatively suspected that the population numbers less than 10,000 mature individuals overall, but the population may well be smaller (see Renjifo et al. 2016) and urgently requires accurate quantification.
Based on observational records within the small range (per eBird 2021) it is assumed that the species forms one single subpopulation (see also Zapata et al. 2020).

Trend justification: The species is declining as a result of historical and continuing habitat alteration, as land has been converted for mining, agriculture, pasture and infrastructural developments (Lara et al. 2012). It is estimated that between 2000 and 2015, 29% of suitable habitat was lost from the range (Negret et al. 2021). Assuming that habitat loss continued at this rate to the present day and that population declines are equivalent to habitat loss, this equates to a suspected population reduction of 20% over the past ten years. Projecting the rate forward from 2015 to 2040 suggests that habitat loss will increase to 50% over this period (Negret et al. 2021), which translates to a rate of decline of 37% over the next ten years.

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	major	resident
Forest	Subtropical/Tropical Dry	suitable	resident
Shrubland	Subtropical/Tropical Dry	suitable	resident
Altitude	250 - 850 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Agriculture & aquaculture	Wood & pulp plantations - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Large dams	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Antioquia Wren Thryophilus sernai. Downloaded from https://datazone.birdlife.org/species/factsheet/antioquia-wren-thryophilus-sernai on 22/11/2024.
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 22/11/2024.