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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2022 | Near Threatened | C2a(ii) |
| 2016 | Vulnerable | C2a(i) |
| 2012 | Vulnerable | C2a(i) |
| 2008 | Vulnerable | C2a(i) |
| 2004 | Vulnerable | |
| 2000 | Vulnerable | |
| 1996 | Vulnerable | |
| 1994 | Vulnerable | |
| 1988 | Threatened |
| Migratory status | not a migrant | Forest dependency | high |
| Land-mass type |
continent |
Average mass | 102 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 193,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 12000-20500, 12000-15000 mature individuals | poor | estimated | 2021 |
| Population trend | decreasing | poor | suspected | 2012-2026 |
| 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 | 4.6 years | - | - | - |
| Number of subpopulations | 1 | - | - | - |
| Percentage of mature individuals in largest subpopulation | 100% | - | - | - |
Population justification: Based on surveys at two sites, Jing et al. (2011) found that P. internigrans occurred at densities of 0.6-1.04 birds/km2, with suggestion that the lower bound of this figure was the most accurate based on the methodology used. This corroborates other reports of the species being rare (Sun et al. 2001). Lu et al. (2012) created a predictive niche-distribution model and estimated the area of suitable habitat in the species' range to be c.60,000 km2, however much of this is fragmented and so tentatively only 50% of suitable habitat is thought to be occupied. Combining these figures, the population size of P. internigrans is estimated at 18,000-31,200 individuals, or 12,000-20,500 mature individuals, with a best estimate of c.12,000-15,000 (accepting the lowest density and the suspicion that the population is suspected to have declined since Lu et al. [2012]).
Trend justification: This species is suspected to be declining at a slow rate, owing to forest loss and fragmentation within its range. Although the former has slowed significantly in the last two decades, the effect of fragmentation is still largely unknown with suggestion that it is impacting breeding productivity and may be causing declines (see Jing et al. 2011). Moreover, Lu et al. (2012) predicted that the range size of the species would contract by 27% (from 60,615 km2 to 44,132 km2) between 2012 and 2050 (using the mean of five scenarios of current climate and 30 of future climate change), equivalent to a rate, if constant, of c.10% over three generations. Given this species' reliance on a relatively narrow habitat type, it is suspected to decline approximately in line with habitat loss.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| China (mainland) | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| China (mainland) | Babso Nature Reserve |
| China (mainland) | Ganligahai-Zecha Nature Reserve |
| China (mainland) | Gonjo |
| China (mainland) | Huanglongsi Nature Reserve |
| China (mainland) | Jiuzhaigou Nature Reserve |
| China (mainland) | Jonê |
| China (mainland) | Kasha Hu Nature Reserve |
| China (mainland) | Markam |
| China (mainland) | Mengbi Shan |
| China (mainland) | Mengtun |
| China (mainland) | Min Shan mountains |
| China (mainland) | Sanjiangyuan Nature Reserve |
| China (mainland) | Sanjiangyuan Nature Reserve |
| China (mainland) | Têwo Nature Reserve |
| China (mainland) | Xiaohegou Nature Reserve |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 3000 - 4270 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 | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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| Agriculture & aquaculture | Livestock farming & ranching - Agro-industry grazing, ranching or farming | 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%) | Rapid Declines | Medium Impact: 6 | ||||||
|
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| Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
| Ongoing | Unknown | Unknown | Unknown | ||||||
|
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Recommended citation
BirdLife International (2024) Species factsheet: Sichuan Jay Perisoreus internigrans. Downloaded from
https://datazone.birdlife.org/species/factsheet/sichuan-jay-perisoreus-internigrans 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.