LC
Wedge-tailed Hillstar Oreotrochilus adela



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. 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: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2021 Least Concern
2016 Near Threatened C1+2a(i)
2012 Near Threatened C1+2a(i)
2008 Near Threatened C1; C2a(i)
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Near Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 87,600 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor inferred 2021
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) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 3 - - -
Percentage in largest subpopulation 1-89 - - -

Population justification: The population size has not been quantified directly. A congener (O. leucopleurus in Argentina) occurs at a density of 4-12 individuals/km2 (Santini et al. 2018); however this is likely not representative for O. adela, whose density is considered not to exceed 4 individuals/km2 (S. K. Herzog in litt. 2021). Assuming that only 10% of the mapped range is occupied to account for the species's rarity (i.e. 3,800 km2), the species may number at most 15,200 individuals, which roughly equates to 10,000 mature individuals. The population size is consequently here placed in the band 2,500-9,999 mature individuals.

Assuming that the species forms three separate subpopulations within its range, that 10% of the range is occupied at a density of up to 4 individuals/km2, the largest subpopulation (occupying an area of 1,700 km2, based on the area of the range polygon) may number up to 4,500 mature individuals.

Trend justification: The population trend has not been quantified. The species is able to tolerate substantial habitat degradation (Fjeldså and Kirwan 2020). However, due to the high anthropogenic pressure on natural habitat within the range, the species is precautionarily suspected to decline slowly owing to habitat degradation and destruction.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Bolivia Reserva Biológica Cordillera de Sama
Bolivia Cuencas de Ríos Caine y Mizque
Bolivia Southern slopes of Tunari National Park (Vertiente Sur del Parque Nacional Tunari IBA)
Argentina Santa Victoria, Cañani y Cayotal
Argentina Queñoales de Santa Catalina
Argentina Yavi y Yavi Chico

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 2550 - 4000 m Occasional altitudinal limits  

Threats & impact
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 - 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
Agriculture & aquaculture Wood & pulp plantations - Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Natural system modifications Fire & fire suppression - Trend Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2023) Species factsheet: Oreotrochilus adela. Downloaded from http://www.birdlife.org on 05/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 05/02/2023.