• 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. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions 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
-	-	B1ab(iii)+2ab(iii)

Red List history

Year	Category	Criteria
2023	Vulnerable	B1ab(iii)+2ab(iii)
2016	Endangered	B1ab(ii,iii,v)
2012	Endangered	B1ab(ii,iii,v)
2008	Endangered	B1a+b(ii,iii,v)
2007	Endangered
2006	Not Evaluated
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)	2,840 km2	medium
Area of Occupancy (breeding/resident)	1,976 km2
Number of locations	6-10	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	poor	suspected	2017-2027
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	2.35 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The population size has not been quantified. The species is locally fairly common, including in disturbed areas; it is considered less vulnerable than other species (such as Grey-headed Warbler Basileuterus griseiceps) to removal of undergrowth for coffee plantations (P. Boesman in litt. 2006, Sharpe and Lentino 2015).

Trend justification: A population decline is suspected on the basis of habitat destruction and fragmentation (Sharpe and Lentino 2015), although there are no analyses to support this (J. Pérez-Emán in litt. 2012). Over the past ten years, tree cover loss amounted to 3% within the range; since 2017 this has been accelerating to a rate equivalent to 5% over ten years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). As the species shows some tolerance of forest loss and degradation and also occurs in scrub habitat, population declines are likely equally low and localised; they are here tentatively placed in the band 1-9% over ten years.

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

Country/Territory	IBA Name
Venezuela	Parque Nacional El Guácharo
Venezuela	Zona Protectora Macizo Montañoso del Turimiquire

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
Shrubland	Subtropical/Tropical High Altitude	major	resident
Altitude	1450 - 1800 m	Occasional altitudinal limits	1180 - 2190 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Small-holder plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Venezuelan Sylph Aglaiocercus berlepschi. Downloaded from https://datazone.birdlife.org/species/factsheet/venezuelan-sylph-aglaiocercus-berlepschi 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.