NT
Bearded Tachuri Polystictus pectoralis



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: #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 Near Threatened A2c+3c+4c
2016 Near Threatened A2c+3c+4c
2012 Near Threatened A2c+3c+4c
2008 Near Threatened A2c; A3c; A4c
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Threatened
Species attributes

Migratory status full migrant Forest dependency does not normally occur in forest
Land-mass type continent
Average mass 6 g
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 11,200,000 km2 medium
Extent of Occurrence (non-breeding) 9,770,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected 2012-2022
Rate of change over the past 10 years/3 generations (longer of the two periods) 10-20% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 10-20% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 10-20% - - -
Generation length 2.04 years - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: Although widespread and fairly common at a few localities, it is generally scarce and localised (Collar and Wege 1995, Parker and Willis 1997). Surveys in the Argentinian Pampas in 2006 to 2008 found the species to be rare, with records in only two of 30 transects (Codesido et al. 2012).

The global population size has not been quantified, but given the size of its range, it is assumed to be larger than 10,000 mature individuals (Collar and Wege 1995). The population in Argentina is suspected to number 2,500-10,000 mature individuals (MAyDS and Aves Argentinas 2017). In French Guiana, there are thought to be fewer than 250 mature individuals (MNHN et al. 2018).

Trend justification: Although there is no direct, quantitative information on population trends, the population is suspected to be in decline owing to ongoing habitat destruction and degradation. 

In Colombia, habitat loss may have led the species to disappear from some areas (Ruiz-Ovalle and Chaparro-Herrera 2016), and in 2005, the species was not found at a site in Meta where it was previously recorded in the 1960s (F. G. Stiles, in Ruiz-Ovalle and Chaparro-Herrera 2016). Although an analysis of habitat change found no loss between 2001 and 2011, the species's population was suspected to have declined by more than 30% over 10.8 years due to fires and habitat conversion, with the rate of loss expected to increase in the future (Renjifo et al. 2016).

In Brazil, the population size is suspected to be declining as a result of ongoing habitat loss and degradation through conversion to agriculture and overgrazing (ICMBio 2013).

In Argentina, surveys in the pampas in 2005-2008 found that other, more common, grassland specialist bird species were present in significantly fewer counties than in 1938 to 1993 (Codesido et al. 2011). However, the species's range has expanded in La Pampa and eastern Buenos Aires since the 1980s (MAyDS and Aves Argentinas 2017).

The species's population size is suspected to be stable in the Sipaliwini Nature Reserve in south Suriname and in adjacent Brazil (O. Ottema in litt. 2020), but declining in French Guiana (MNHN et al. 2018).

Overall, the population is suspected to be declining moderately rapidly, with a rate of decline here placed in the band 10-20% over ten years, although this is highly uncertain.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Argentina extant native yes yes
Bolivia possibly extinct native yes
Brazil extant native yes
Colombia extant native yes
French Guiana extant native yes
Guyana extant native yes
Paraguay extant native yes
Suriname extant native yes
Uruguay extant native yes
Venezuela extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Islas de Victoria
Bolivia Área Natural de Manejo Integrado San Matías
Colombia Reserva Forestal Yotoco
Venezuela Parque Nacional Canaima
Venezuela Monumento Natural Tepui Roraima
Venezuela Monumento Natural Tepui Yavi
Argentina Bañado de Añatuya
Argentina Bañados de Figueroa
Argentina Valle Fluvial del Río Paraguay
Argentina Estancia La Leonor
Argentina Estero Tapenagá
Argentina Valle del río Paraguay-Paraná
Argentina Reserva El Bagual
Argentina Bañado La Estrella Este
Argentina Nacientes de los riachos Monte Lindo y Tatú Piré
Argentina Bañado La Estrella Oeste
Argentina Riacho Saladillo
Argentina Campo San Juan
Argentina Estancia San Juan Poriahú
Argentina Parque Nacional Mburucuyá
Argentina Concepción-Chavarría
Argentina Región Estancia Oscuro
Argentina Perdices
Argentina Nandubaysal-El Potrero
Argentina Parque Nacional Pre-Delta
Argentina Ceibas
Argentina Bajos Submeridionales
Argentina Reserva Provincial de Usos Múltiples Federico Wildermuth
Argentina Laguna de Pradere
Argentina Sierras Australes de Buenos Aires
Argentina Villa Iris, Chasicó, Napostá
Argentina Cuenca del Río Salado
Argentina Bañados del Río Saladillo
Argentina Reserva de Uso Múltiple Bañados del Río Dulce y Laguna Mar Chiquita
Argentina Pastizales de Ibicuy
Brazil Savanas do Amapá
Brazil Campo do Alto Marmelos
Brazil Savanas do Rio Cotingo
Suriname Sipaliwini Nature Reserve
Paraguay Estancias Golondrina - El Trébol
Paraguay Parque Nacional Defensores del Chaco
Paraguay Parque Nacional San Rafael
Paraguay Parque Nacional Tinfunqué - Estero Patiño
Colombia Cuenca del Río Toche
French Guiana Savanes Trou Poissons, Brigandin, Corrossony
Colombia Reservas de la vereda Altagracia
Colombia Chaviripa-El Rubí

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subtropical/Tropical Dry major non-breeding
Grassland Subtropical/Tropical Dry major breeding
Grassland Subtropical/Tropical Seasonally Wet/Flooded major non-breeding
Grassland Subtropical/Tropical Seasonally Wet/Flooded major breeding
Savanna Dry major non-breeding
Savanna Dry major breeding
Altitude 150 - 1350 m Occasional altitudinal limits (max) 1600 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 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 - Agro-industry plantations Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
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
Energy production & mining Renewable energy Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species disturbance, Ecosystem degradation, Ecosystem conversion
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Polystictus pectoralis. Downloaded from https://datazone.birdlife.org/species/factsheet/bearded-tachuri-polystictus-pectoralis on 23/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 23/02/2024.