EN
Venezuelan Sylph Aglaiocercus berlepschi



Taxonomy

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://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,v) B1ab(ii,iii,v)

Red List history
Year Category Criteria
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
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 4,200 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 1500-7000 poor suspected 2006
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 20-29 - - -
Decline (10 years/3 generation past and future) 20-29 - - -
Number of subpopulations 2-100 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 4.2 - - -

Population justification: This species is locally fairly common in suitable habitat (Sharpe and Lentino 2015), and considered less vulnerable than others (such as Grey-headed Warbler Basileuterus griseiceps) to removal of undergrowth for coffee plantations (Boesman in litt. 2006). Its population is estimated to number 2,500-9,999 individuals, equating to 1,667-6,666 mature individuals, which is rounded here to 1,500-7,000 mature individuals.

Trend justification: A moderately rapid and ongoing population decline is suspected on the basis of rates of habitat destruction and fragmentation (Sharpe and Lentino 2008, Sharpe and Lentino 2015), although there are no analyses to support this (J. Pérez-Emán in litt. 2012).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Venezuela N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Venezuela Parque Nacional El Guácharo
Venezuela Zona Protectora Macizo Montañoso del Turimiquire

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane major resident
Shrubland Subtropical/Tropical High Altitude major resident
Altitude 1450 - 1800 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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Future Minority (<50%) Very Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Future Minority (<50%) Rapid Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Aglaiocercus berlepschi. Downloaded from http://www.birdlife.org on 26/09/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/09/2022.