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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
B1ab(ii,iii,v); C2a(i,ii); D | B1ab(ii,iii,v)+2ab(ii,iii,v); C2a(i,ii); D | B1ab(ii,iii,v)+2ab(ii,iii,v); C2a(i,ii); D1+2 |
Year | Category | Criteria |
---|---|---|
2021 | Critically Endangered | B1ab(ii,iii,v); C2a(i,ii); D |
2018 | Critically Endangered | B1ab(i,ii,iii,v);C2a(i,ii);D |
2016 | Critically Endangered | B1ab(i,ii,iii,v);C2a(i,ii);D |
2013 | Critically Endangered | B1ab(i,ii,iii,v);C2a(i,ii);D |
2012 | Critically Endangered | B1ab(i,ii,iii,v);C2a(i,ii);D |
2010 | Critically Endangered | B1a+b(i,ii,iii,v); C2a(ii) |
2009 | Critically Endangered | B1a+b(i,ii,iii,v); C2a(ii) |
2008 | Critically Endangered | |
2006 | Critically Endangered | |
2005 | Critically Endangered | |
2004 | Critically Endangered | |
2000 | Critically Endangered | |
1996 | Critically Endangered | |
1994 | Critically Endangered | |
1988 | Threatened |
Migratory status | not a migrant | Forest dependency | medium |
Land-mass type |
continent |
Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 34 km2 | medium |
Area of Occupancy (breeding/resident) | 56 km2 | |
Number of locations | 1 | - |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 1-49 mature individuals | medium | estimated | 2020 |
Population trend | decreasing | poor | inferred | 2012-2022 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-10% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-10% | - | - | - |
Generation length | 3.58 years | - | - | - |
Number of subpopulations | 1 | - | - | - |
Percentage of mature individuals in largest subpopulation | 100% | - | - | - |
Population justification: There have been very few recent records of the species. In the Jequitinhonha valley (the sole currently known population), at least four birds were found in a 100 ha area in the early 2000s, but it was thought unlikely that this density could be extrapolated for the whole 2,000 ha partly fragmented patch of forest (R. Ribon in litt. 2006, 2020). Subsequent surveys in the RPPN Mata do Passarinho and mata do Lodo found six individuals: five females and a single male (Damasceno 2011). Three males were recorded in 2012 (WikiAves 2013) and in 2011 the total population was considered to be no more than 10-15 individuals (R. Ribon in litt. 2011). Surveys in 2016 found only one pair with a nest, which failed, and surveys in 2017 did not detect any individuals (Rutter 2018). An expedition in 2018 found a single female outside the boundaries of the Reserva Mata do Passarinho (BirdGuides 2018). It is therefore now considered probable that there are no more than 10 individuals remaining (A. Souza in litt. 2020), and the population size is placed in the band 1-49 mature individuals.
Trend justification: There are no direct data on population trends. The species's population size is inferred to be in decline based on ongoing habitat degradation caused by fires and logging. According to Global Forest Watch, approximately 8.5% of tree cover with at least 50% canopy cover was lost within the species's mapped extant range over three generations (11 years) from 2008-2019 (Global Forest Watch 2020). This loss largely occurred in 2016 (Global Forest Watch 2020), when a large fire is known to have occurred (R. Ribon in litt. 2020). The species's population is therefore suspected to have declined by up to 10% over the past ten years.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Brazil | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Brazil | Bandeira / Macarani |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | resident |
Forest | Subtropical/Tropical Dry | major | resident |
Altitude | 0 - 930 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
Past, Likely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
Agriculture & aquaculture | Livestock farming & ranching - Agro-industry grazing, ranching or farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Whole (>90%) | Slow, Significant Declines | Medium Impact: 7 | ||||||
|
|||||||||
Agriculture & aquaculture | Wood & pulp plantations - Agro-industry plantations | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Biological resource use | Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Ongoing | Whole (>90%) | Slow, Significant Declines | Medium Impact: 7 | ||||||
|
|||||||||
Climate change & severe weather | Droughts | Timing | Scope | Severity | Impact | ||||
Ongoing | Whole (>90%) | Unknown | Unknown | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Canis familiaris | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Unknown | Unknown | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Felis catus | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Unknown | Unknown | ||||||
|
|||||||||
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 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Stresemann's Bristlefront Merulaxis stresemanni. Downloaded from
https://datazone.birdlife.org/species/factsheet/stresemanns-bristlefront-merulaxis-stresemanni on 24/12/2024.
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 24/12/2024.