VU
Pectoral Antwren Herpsilochmus 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
- - B2ab(i,ii,iii,iv,v); C2a(i)

Red List history
Year Category Criteria
2017 Vulnerable B2ab(i,ii,iii,iv,v); C2a(i)
2016 Vulnerable A2c+3c+4c;B1ab(i,ii,iii,iv,v);C2a(i)
2012 Vulnerable A2c+3c+4c;B1ab(i,ii,iii,iv,v);C2a(i)
2008 Vulnerable A2c; A3c; A4c; B1a+b(i,ii,iii,iv,v); C2a(i)
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 879,000 km2 medium
Area of Occupancy (breeding/resident) 1,900 km2
Number of locations 11-100 -
Severely fragmented? yes -
Population
Estimate Data quality Derivation Year of estimate
Population size 2500-9999 mature individuals poor estimated 2000
Population trend decreasing poor suspected 1998-2008
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 4.8 years - - -
Number of subpopulations 2-100 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals. Densities of 60-113 birds/km2 have been found (Silva 2007).

Trend justification: Forest loss within the species's range has been estimated at c.3.4% over 3 generations (c.14 years) (Tracewski et al. 2016). Therefore, the rate of decline in this species is suspected to be <10% over 3 generations.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Brazil Ibiquera / Ruy Barbosa
Brazil Raso da Catarina
Brazil Mata Estrela
Brazil Serra de Itabaiana e Matas de Areia Branca

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Savanna Dry major resident
Shrubland Subtropical/Tropical Dry suitable resident
Altitude 0 - 850 m Occasional altitudinal limits  

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 Minority (<50%) Slow, Significant Declines 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 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 degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2024) Species factsheet: Herpsilochmus pectoralis. Downloaded from https://datazone.birdlife.org/species/factsheet/pectoral-antwren-herpsilochmus-pectoralis on 27/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 27/02/2024.