LC
Spix's Antwarbler Hypocnemis striata



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
2020 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Not Recognised
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,190,000
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 100000-499999 poor suspected 2020
Population trend Decreasing inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 7-22,14 - - -
Decline (10 years/3 generation past and future) 7-22,14 - - -
Number of subpopulations - - -
Percentage in largest subpopulation 1-89 - - -

Population justification: The species is described as fairly common to common throughout most of its extensive range, although it is apparently uncommon and very local at the eastern edge of its range (del Hoyo et al. 2003, 2020). Based on the area of tree cover with at least 30% canopy cover within the species's range in 2010 (931,000 km2; Global Forest Watch 2020), the minimum recorded density of a congener (2 individuals per km2; Terbough et al. 1990) and assuming 25-40% of habitat within the range is occupied, the population size is tentatively suspected to fall within the range 465,500 - 744,800 individuals, roughly equating to 310,333 - 496,533 mature individuals and here placed in the band 100,000 - 499,999 mature individuals. There are three subspecies, so there are at least three subpopulations.

Trend justification: Remote-sensed data on forest loss indicates a loss of approximately 7% of tree cover with at least 30% canopy cover within the species's range from 2009-2019 (Global Forest Watch 2020). The population size is inferred to be undergoing a continuing decline. 

An analysis of the impact of disturbance on forest species in Pará found that in private lands or sustainable-use reserves, the impact of disturbance on biodiversity was equivalent to that of an additional 51% loss of forest, with disturbance in areas with 83% forest loss causing 147% the expected level of biodiversity loss (Barlow et al. 2016). However, the species is thought to be tolerant of forest that has survived fire (del Hoyo et al. 2020). Assuming that the population size is proportional to forest area, and taking into account the potential additional impact of disturbance, the population size is suspected to have undergone a reduction of 7-17% over the past decade.

In the three years from 2017-2019, approximately 2.8% of forest within the range was lost (Global Forest Watch 2020). If this rate of forest loss were to occur over ten years, this would equate to a loss of 9%. Assuming that the population size is proportional to forest area, and that disturbance may increase the impact of deforestation by up to 147%, a population reduction of 7-22% is suspected over the next decade. Taking 51% as a best estimate of the additional impact of disturbance, and assuming 9% forest loss, the best estimate of population reduction over the next decade is 14%.


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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Swamp major resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) suitable resident
Altitude 0 - 800 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 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
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2022) Species factsheet: Hypocnemis striata. Downloaded from http://www.birdlife.org on 30/06/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 30/06/2022.