Data Zone
Taxonomic note
Sylviorthorhynchus yanacensis (del Hoyo and Collar 2016) was previously listed as Leptasthenura yanacensis.
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 |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2022 | Least Concern | |
| 2016 | Near Threatened | C1+2a(i) |
| 2012 | Near Threatened | C1+2a(i) |
| 2008 | Near Threatened | C1; C2a(i) |
| 2004 | Near Threatened | |
| 2000 | Lower Risk/Near Threatened | |
| 1994 | Lower Risk/Near Threatened | |
| 1988 | Near Threatened |
| Migratory status | not a migrant | Forest dependency | medium |
| Land-mass type |
continent |
Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 795,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 50000-100000 mature individuals | poor | inferred | 2021 |
| Population trend | decreasing | poor | suspected | 2016-2026 |
| Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Rate of change over the future 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Generation length | 2.3 years | - | - | - |
| Number of subpopulations | 5 | - | - | - |
| Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: The global population size has not been quantified, but the species is described as 'uncommon and patchily distributed' (Stotz et al. 1996; see also Benham et al. 2011). Assuming that the species occurs at the same density as a congener (S. desmursii in Argentina: 5-10 individuals/km2; Santini et al. 2018) and further assuming that only 10% of the mapped range are occupied to account for the species's rarity, the population may number 74,000-148,000 individuals. This roughly equates to 50,000-100,000 mature individuals.
The subpopulation structure has not been investigated, but based on the species's disjunct range it is thought that it forms five subpopulations, the largest of which may number c.20,000-40,000 mature individuals.
Trend justification: This species is suspected to be declining owing to the loss and degradation of its Polylepis habitat (J. Cahill in litt. 2020). Over ten years, about 2% of tree cover is lost within the range (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Therefore, population declines are unlikely to exceed 10% over ten years.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Argentina | extant | native | yes | |||
| Bolivia | extant | native | yes | |||
| Peru | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Argentina | Alto Calilegua |
| Argentina | Caspala y Santa Ana |
| Argentina | Pampichuela |
| Argentina | Queñoales de Santa Catalina |
| Argentina | San Lucas |
| Argentina | Santa Victoria, Cañani y Cayotal |
| Argentina | Valle Colorado y Valle Grande |
| Bolivia | Bosque de Polylepis de Madidi |
| Bolivia | Reserva Biológica Cordillera de Sama |
| Bolivia | Reserva Nacional de Flora y Fauna Tariquía |
| Bolivia | Southern slopes of Tunari National Park (Vertiente Sur del Parque Nacional Tunari IBA) |
| Bolivia | Yungas Superiores de Apolobamba |
| Peru | Abra Málaga-Vilcanota |
| Peru | Cordillera Huayhuash y Nor-Oyón |
| Peru | Parque Nacional Huascarán |
| Peru | Santuario Histórico Machu Picchu |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Shrubland | Subtropical/Tropical High Altitude | major | resident |
| Altitude | 2850 - 4600 m | Occasional altitudinal limits | (max) 5200 m |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Livestock farming & ranching - Small-holder grazing, ranching or farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Causing/Could cause fluctuations | Medium Impact: 6 | ||||||
|
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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 | ||||||
|
|||||||||
| Natural system modifications | Fire & fire suppression - Increase in fire frequency/intensity | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Negligible declines | Low Impact: 5 | ||||||
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Recommended citation
BirdLife International (2024) Species factsheet: Tawny Tit-spinetail Sylviorthorhynchus yanacensis. Downloaded from
https://datazone.birdlife.org/species/factsheet/tawny-tit-spinetail-sylviorthorhynchus-yanacensis on 22/11/2024.
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 22/11/2024.