EN
Black-hooded Antwren Formicivora erythronotos



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
- B1ab(iii)+2ab(iii); D B1ab(iii)+2ab(iii); D1

Red List history
Year Category Criteria
2020 Endangered B1ab(iii)+2ab(iii)
2016 Endangered B1ab(i,ii,iii,v)
2012 Endangered B1ab(i,ii,iii,v)
2008 Endangered B1a+b(i,ii,iii,v)
2004 Endangered
2000 Endangered
1996 Critically Endangered
1994 Critically Endangered
1988 Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 410 medium
Extent of Occurrence breeding/resident (km2) 10
Number of locations 2-5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 50-8500 poor suspected 2020
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-8 - - -
Decline (10 years/3 generation past and future) 1-8 - - -
Number of subpopulations 1-7 - - -
Percentage in largest subpopulation 90-100 - - -

Population justification: This species has an extremely small range, and it has been reported to be difficult to locate (Tobias et al. 1993, Tobias and Williams 1996), although it is considered locally abundant in suitable habitat (CEMAVE 2018). Reported densities are 156 pairs/kmat Vale do Mambucaba and 89 pairs/km2 at Ariró (Gonzaga 2008), which collectively are thought to hold more than 90% of the total population (CEMAVE 2018). Although the population size has not been directly quantified, it is suspected to be smaller than 250 mature individuals, based on sightings by researchers within the range (CEMAVE 2018).

Based on an assumed minimum population density of 40 individuals/km2 (consistent with status as a locally common antwren), an upper density of 267 individuals/km2 (assumed equivalent to 89 pairs/km2), and assuming 11-45% of the mapped range is occupied, the population is here suspected to number 475-12,680 individuals . This equates to approximately 317-8,453 mature individuals, here rounded to 300-8,500 mature individuals. The population size is therefore placed in the band 50-8,500 mature individuals.

The number of subpopulations is not known. Based on discontinuities between areas with records, the species is assumed to have at least two subpopulations. According to the Brazilian national Red List, 90-100% of individuals are thought to comprise a single subpopulation (CEMAVE 2018). The largest subpopulation is therefore suspected to hold 45-8,500 mature individuals.

Trend justification: An ongoing slow population decline is suspected to be taking place, based on observational information (Tobias and Williams 1996) and remote-sensed data (Global Forest Watch 2020) on habitat loss. From 2010 to 2019, approximately 4% of tree cover was lost within the species's range (Global Forest Watch 2020). The species is tolerant of degraded habitat and occurs in scrubby habitats and secondary forest, so there is a low level of confidence in the population trend, but the species is suspected to be declining, with a suspected population reduction over the last ten years of 1-4%. In 2017, approximately 0.8% of forest within the species's range was lost within a single year (Global Forest Watch 2020). Extrapolating this rate over 10 years would equate to approximately 8%. Using this value as a maximum, the population is suspected to decline by 1-8% over the next decade.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Brazil N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Brazil Serra da Bocaina / Paraty / Angra dos Reis
Brazil Baía de Ilha Grande

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Shrubland Subtropical/Tropical Moist major resident
Altitude 0 - 50 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
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 degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2021) Species factsheet: Formicivora erythronotos. Downloaded from http://www.birdlife.org on 23/04/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/04/2021.