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Choco Vireo Vireo masteri

IUCN Red List Criteria

Critically Endangered  
Endangered B1ab(i,ii,iii,v) 
Vulnerable B1ab(i,ii,iii,v) 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2004 Endangered
2000 Endangered
1994 Vulnerable
1988 Not Recognised

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 3,100 medium
Number of locations 3 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 15423-15777 poor Estimated 2007
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 4.2 - - -
Population justification: Its potential global population was estimated to be as high as 78,000 ±7,000 mature individuals based on estimates of the area of forest cover within its range. However, the two occupied areas in Colombia are 520 km apart, and although the species may occur in appropriate habitat in between these sites (Salaman and Stiles 1996, Salaman in litt. 1999, 2000, 2003, Renjifo et al. 2002), searches of the intervening area have completely failed to find the species, despite excellent knowledge of its vocalizations and its reliable response to playback (Salaman in litt. 1999, 2000, 2003). Therefore, a precautionary population size estimate was made of 15,600 ±1,400 mature individuals based upon a figure of 20% occupancy within the Extent of Occurrence (Jahn et al. 2007). The total population is estimated to number 20,000-25,000 individuals, based on population density data from Ecuador extrapolated over the species's known range. Population size is thought to be declining owing to loss and fragmentation of its habitat.
Trend justification: The rate of habitat loss within occupied cloud-forest habitat types is unknown, but the species is suspected to be declining at a slow rate.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Colombia Native Extant Yes      
Ecuador Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Colombia Alto de Pisones site factsheet
Colombia Reserva Natural El Pangán site factsheet
Colombia Reserva Natural Río Ñambí site factsheet
Ecuador Mashpi-Pachijal site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane major resident
Altitude 1100 - 1600 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 Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching / Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation
Energy production & mining Mining & quarrying Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Vireo masteri. Downloaded from http://www.birdlife.org on 01/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/10/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Endangered
Family Vireonidae (Vireos and allies)
Species name author Salaman & Stiles, 1996
Population size 15423-15777 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 3,100 km2
Country endemic? No
Links to further information
- Summary information on this species