Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | B1ab(ii,iii)+2ab(ii,iii) | B1ab(ii,iii)+2ab(ii,iii); D2 |
Year | Category | Criteria |
---|---|---|
2022 | Endangered | B1ab(ii,iii)+2ab(ii,iii) |
2016 | Endangered | B1ab(v) |
2012 | Endangered | B1ab(v) |
2008 | Endangered | B1a+b(v) |
2007 | Endangered | |
2004 | Endangered | |
2000 | Vulnerable | |
1996 | Endangered | |
1994 | Endangered | |
1988 | Not Recognised |
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) | 3,400 | medium |
Extent of Occurrence breeding/resident (km2) | 190 | |
Number of locations | 3 | - |
Severely Fragmented | - |
Value | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
No. of mature individuals | 2000-2700 | medium | estimated | 2007 |
Population trend | Decreasing | medium | suspected | - |
Decline (3 years/1 generation past) | - | - | - | |
Decline (5 years/1 generation past) | - | - | - | |
Decline (10 years/1 generation past) | - | - | - | |
Decline (10 years/3 generation future) | 1-5 | - | - | - |
Decline (10 years/3 generation past and future) | 1-5 | - | - | - |
Number of subpopulations | 2 | - | - | - |
Percentage in largest subpopulation | 1-89 | - | - | - |
Generation length (yrs) | 4.43 | - | - | - |
Population justification: Dinesen et al. (2001) estimate the population to be 3,700 individuals based on the species' range and density in the Ndundulu forest. Butynski and Ehardt (2003) have suggested that this estimate may be too high as in other parts of its range it appears significantly less common. The population may be best estimated in the range 3,000-4,000 individuals (L. Hansen in litt. 2007), roughly equating to 2,000-2,700 mature individuals.
Trend justification: The population has been thought to be stable, with large fluctuations between years (L. Hansen in litt. 2007). However, due to habitat loss and degradation, as well as the additional pressure of hunting, the overall trend is suspected to be decreasing. Deforestation rates within the range have been low over the past three generations (13.29 years), amounting to <5% (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Population declines are therefore suspected to not exceed 5% over three generations.
Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
---|---|---|---|---|---|---|
Tanzania | N | Extant | Yes |
Country/Territory | IBA Name |
---|---|
Tanzania | Udzungwa National Park |
Tanzania | Rubeho Mountains |
Tanzania | Udzungwa Mountains |
Tanzania | Udzungwa Mountain Range |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Montane | major | resident |
Altitude | 1300 - 2400 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 | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
Biological resource use | Hunting & trapping terrestrial animals - Intentional use (species is the target) | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Human intrusions & disturbance | Work & other activities | 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%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
---|---|---|---|---|---|---|
Food - human | - | - | Non-trivial | Recent |
Recommended citation
BirdLife International (2022) Species factsheet: Xenoperdix udzungwensis. Downloaded from
http://www.birdlife.org on 08/08/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 08/08/2022.