EN
Venezuelan Flowerpiercer Diglossa venezuelensis



Taxonomy

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.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- B1ab(ii,iii,v); C2a(i) B1ab(ii,iii,v); C2a(i); D1

Red List history
Year Category Criteria
2019 Endangered B1ab(ii,iii,v); C2a(i)
2016 Endangered B1ab(i,ii,iii,v)
2012 Endangered B1ab(i,ii,iii,v)
2008 Endangered B1a+b(i,ii,iii,v)
2004 Endangered
2000 Endangered
1996 Critically Endangered
1994 Critically Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency does not normally occur in forest
Land-mass type continent
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 4,500 km2 medium
Number of locations 3-5 -
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 670-11000 mature individuals poor inferred 2018
Population trend decreasing poor inferred 1998-2008
Generation length 3.7 years - - -
Number of subpopulations 2-5 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: Based on the area of the species’s mapped range (916 km2), the recorded population densities of congeneric species (Diglossa albilatera and Diglossopis cyanea: a minimum of 10 individuals/km2 in montane forest in Ecuador; Diglossa humeralis: 20-40 individuals/km2 in secondary scrub/farmland in Ecuador [Cresswell et al. 1999]), and assuming that 11-45% of the range is occupied, the species’s population size is estimated to fall within the range 1,000 – 16,500 individuals, roughly equivalent to 670 – 11,000 mature individuals.

Trend justification: A comparison of historical collection data with that obtained over the past few decades suggests that the population is decreasing (Sharpe 2008, 2015).


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Venezuela Parque Nacional El Guácharo
Venezuela Peninsula de Paria National Park (Parque Nacional Península de Paria IBA)
Venezuela Zona Protectora Macizo Montañoso del Turimiquire

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Shrubland Subtropical/Tropical High Altitude suitable resident
Altitude 885 - 2450 m Occasional altitudinal limits (min) 850 m

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
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Future Minority (<50%) Rapid Declines Low Impact: 4
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, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Venezuelan Flowerpiercer Diglossa venezuelensis. Downloaded from https://datazone.birdlife.org/species/factsheet/venezuelan-flowerpiercer-diglossa-venezuelensis on 23/12/2024.
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 23/12/2024.