Taxonomic note
Scytalopus gonzagi (del Hoyo and Collar 2016) is recognized as a species following work by Maurício et al. (2014).
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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | B1ab(ii,iii) | B1ab(ii,iii)+2ab(ii,iii); D2 |
Year | Category | Criteria |
---|---|---|
2022 | Endangered | B1ab(ii,iii) |
2016 | Endangered | B1ab(ii,iii,v)+2ab(ii,iii,v); C2a(ii) |
2012 | Not Recognised | |
2008 | Not Recognised | |
2004 | Not Recognised | |
2000 | Not Recognised | |
1994 | Not Recognised | |
1988 | Not Recognised |
Migratory status | not a migrant | Forest dependency | high |
Land-mass type | Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 3,300 km2 | |
Area of Occupancy (breeding/resident) | 760 km2 | |
Number of locations | 2-5 | - |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 1000-2499 mature individuals | medium | estimated | 2014 |
Population trend | decreasing | - | suspected | 2016-2026 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
Rate of change over the future 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
Generation length | 3.06 years | - | - | - |
Number of subpopulations | 2 | - | - | - |
Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: The population was estimated at 2,880 individuals (Maurício et al. 2014), which roughly equates to 1,920 mature individuals. To account for uncertainties, the population is here placed in the band 1,000-2,499 mature individuals, but a recent population estimate is urgently required. Given the geographical division between the two known areas for the species, it is assumed that it forms two disjunct subpopulations.
Trend justification: The population is suspected to be in decline owing to ongoing habitat destruction. Within the range, tree cover is lost at a rate of 5% over ten years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). As the species is strictly dependent on forest favouring pristine areas (Maurício et al. 2014, del Hoyo et al. 2020), the rate of population decline may be faster than the rate of tree cover loss alone; it is here tentatively placed in the band 1-19% over ten year.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Brazil | extant | native | yes |
Country/Territory | IBA Name |
---|
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Montane | major | resident |
Altitude | 660 - 1140 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Shifting agriculture | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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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 | ||||||
|
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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: Boa Nova Tapaculo Scytalopus gonzagai. Downloaded from
https://datazone.birdlife.org/species/factsheet/boa-nova-tapaculo-scytalopus-gonzagai on 03/12/2024.
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 03/12/2024.