Data Zone
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#.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | B1ab(i,ii,iii,iv,v); C2a(i) | B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C2a(i); D1 |
| Year | Category | Criteria |
|---|---|---|
| 2022 | Endangered | B1ab(i,ii,iii,iv,v); C2a(i) |
| 2016 | Endangered | B1ab(i,ii,iii,iv,v);C2a(ii) |
| 2012 | Endangered | B1ab(i,ii,iii,iv,v);C2a(ii) |
| 2011 | Endangered | B1a+b(i,ii,iii,iv,v) |
| 2008 | Vulnerable | D2 |
| 2004 | Vulnerable | |
| 2000 | Vulnerable | |
| 1996 | Vulnerable | |
| 1994 | Vulnerable | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | High |
| Land mass type |
Land-mass type - continent |
Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 1,400 | medium |
| Extent of Occurrence breeding/resident (km2) | 756 | |
| Number of locations | 2-5 | - |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 330-800 | medium | estimated | 2011 |
| Population trend | Decreasing | poor | 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) | 20-29 | - | - | - |
| Decline (10 years/3 generation past and future) | 20-29 | - | - | - |
| Number of subpopulations | 2-10 | - | - | - |
| Percentage in largest subpopulation | 1-89 | - | - | - |
| Generation length (yrs) | 4.06 | - | - | - |
Population justification: Recent surveys recorded the species at a density of 2-3 birds/km2; estimates based on this data place the population at 500-1,200 individuals (O. Cortes in litt. 2012), roughly equivalent to 330-800 mature individuals.
Trend justification: Habitat loss, degradation and disturbance in its range suggest that the population has undergone a decline (O. Cortes in litt. 2011). The Farallones de Medina and Monterredondo areas have now been partly deforested (P. G. W. Salaman in litt. 1999, 2003; Renjifo et al. 2014), and subsequent searches there have failed to record the species (O. Cortes in litt. 2012).
Over the past three generations (12.2 years), tree cover loss within the range has been very low (1% over three generations; Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein) and as such habitat loss has unlikely been driving a rapid population decline. Tentatively it is suspected that declines over the past three generations did not exceed 5%. However, projections of habitat loss as a consequence of deforestation suggest that between 2015 and 2040 the species may lose 46% of suitable habitat (Negret et al. 2021), which equates to 26% over three generations. Given that the species is strictly dependent on montane forests (Greeney 2020), it is tentatively suspected that population declines are roughly equivalent to the rate of habitat loss. Consequently, the population may be declining by 20-29% over the next three generations.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Colombia | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Colombia | Cañón del Río Guatiquía |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 1200 - 2700 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops - Small-holder farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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| Agriculture & aquaculture | Livestock farming & ranching - Small-holder grazing, ranching or farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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| Agriculture & aquaculture | Wood & pulp plantations - Small-holder plantations | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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| Biological resource use | Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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Recommended citation
BirdLife International (2023) Species factsheet: Grallaria kaestneri. Downloaded from
http://www.birdlife.org on 21/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 21/03/2023.
