NT
Black-billed Flycatcher Aphanotriccus audax



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
- - -

Red List history
Year Category Criteria
2023 Near Threatened A2c+3c+4c
2016 Near Threatened A2c+3c+4c
2012 Near Threatened A2c+3c+4c
2011 Near Threatened A2c; A3c; A4c
2008 Near Threatened
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 high
Land-mass type continent
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 222,000 km2 medium
Area of Occupancy (breeding/resident) 34,000 km2
Severely fragmented? no -
Population
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) 20-29% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 20-29% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 20-29% - - -
Generation length 2.41 years - - -
Number of subpopulations 6-100 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: The global population size or density are not known. The species is described as uncommon to locally common, being more abundant in foothill zones than in the lowlands (Renjifo et al. 2016 and references therein). It may potentially be overlooked due to its inconspicuousness, though it is likely that it is generally rare and local (Fundación ProAves 2011, Renjifo et al. 2016).

Trend justification: While there are no exact data on the population trend, it is suspected that the species is undergoing a decline caused by the loss, degradation and fragmentation of mature forests within its range (Farnsworth and Lebbin 2020). In Panama, it is suspected that 50% of the species' range has been deforested since the 1980s (G. R. Angehr in litt. 2011), while in Colombia, 85% of the original habitat has already been lost (Renjifo et al. 2016). The population in Colombia is suspected to have declined by 30% in the eleven years to 2011 (Fundación ProAves 2011), which equates to a decline of 28% over ten years over that period.
Within its global range, tree cover loss over the last ten years amounts to 7-12% (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). Given the species' strong preference for primary forest, population declines may be steeper than the rate of tree cover loss suggests, due to additional negative impacts of forest degradation and fragmentation. It is therefore here tentatively suspected that the population is declining at a rate of 20-29% over ten years.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Zona deltáica-estuarina del Río Sinú
Panama Darién National Park

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 600 m Occasional altitudinal limits (max) 700 m

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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Small-holder 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 - Agro-industry plantations Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Energy production & mining Mining & quarrying 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: Black-billed Flycatcher Aphanotriccus audax. Downloaded from https://datazone.birdlife.org/species/factsheet/black-billed-flycatcher-aphanotriccus-audax 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.