LC
Maquis Canastero Asthenes heterura



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
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
1996 Vulnerable
1994 Vulnerable
1988 Lower Risk/Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 223,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 10000-19999 mature individuals poor suspected 2020
Population trend decreasing poor suspected 2016-2025
Rate of change over the past 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 1-9% - - -
Generation length 2.69 years - - -
Number of subpopulations 3-10 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: The species is described as 'fairly common' (Stotz et al. 1996). The population has not been quantified, but based on observational records it is suspected to number 10,000-19,999 mature individuals, though this requires confirmation.
Even though the subpopulation structure has not been assessed, it is here assumed that the species forms at least three moderately large subpopulations (per eBird 2021).

Trend justification: Population trends have not been directly estimated. Even though the species tolerates habitat disturbance, the population is suspected to be in slow decline locally due to habitat loss and degradation (Remsen 2020). The overall rate of decline is unlikely to exceed 10% over ten years.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Alto Calilegua
Argentina Caspala y Santa Ana
Argentina Cerro Negro de San Antonio
Argentina Cuesta del Obispo
Argentina Fincas Santiago y San Andrés
Argentina Parque Nacional Los Cardones
Argentina Quebrada del Toro
Argentina San Lucas
Argentina Santa Victoria, Cañani y Cayotal
Argentina Valle Colorado y Valle Grande
Bolivia Reserva Nacional de Flora y Fauna Tariquía
Bolivia Southern slopes of Tunari National Park (Vertiente Sur del Parque Nacional Tunari IBA)

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Pastureland suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Grassland Subtropical/Tropical High Altitude suitable resident
Shrubland Subtropical/Tropical High Altitude major resident
Altitude 3000 - 4200 m Occasional altitudinal limits (min) 2500 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 Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations - Small-holder plantations Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Maquis Canastero Asthenes heterura. Downloaded from https://datazone.birdlife.org/species/factsheet/maquis-canastero-asthenes-heterura on 04/12/2024.
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 04/12/2024.