Taxonomic note
Cyornis umbratilis (del Hoyo and Collar 2016) was previously listed as Rhinomyias umbratilis.
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 |
---|---|---|
2023 | Near Threatened | A2c+3c+4c |
2016 | Near Threatened | A2c+3c+4c |
2012 | Near Threatened | A2c+3c+4c |
2008 | Near Threatened | A2c; A3c; A4c |
2004 | Near Threatened | |
2000 | Lower Risk/Near Threatened | |
1994 | Lower Risk/Least Concern | |
1988 | Lower Risk/Least Concern |
Migratory status | not a migrant | Forest dependency | medium |
Land-mass type |
continent shelf island |
Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 2,770,000 km2 | medium |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | unknown | - | - | - |
Population trend | decreasing | poor | suspected | 2016-2026 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 15-29,20-29% | - | - | - |
Rate of change over the future 10 years/3 generations (longer of the two periods) | 15-29,20-29% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 15-29,20-29% | - | - | - |
Generation length | 2.95 years | - | - | - |
Number of subpopulations | 3-50 | - | - | - |
Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: The global population size has not been quantified but is believed to be large given the range and frequency of records in suitable habitat. Cyornis umbratilis is a forest-dependent species and appears to occur only in primary forest (eBird 2022). Within its range, the rate of forest conversion to plantations, primarily oil palm, has been rapid over the past few decades (per Global Forest Watch 2022). There are recent records from remaining forested areas across the range, however the extent of suitable habitat is now considerably smaller than three generations ago. Where habitat is secure the species continues to be regularly observed (eBird 2022), though observing the species away from protected areas is becoming increasingly difficult. In Thailand, all recent records are from (/the vicinity of) the Hala Bala Wildlife Sanctuary (Treesucon and Limparungpatthanakij 2018, eBird 2022) and the population there must be relatively small. Almost all records in Malaysia now come from protected areas or forest concessions, and the population is thought to be declining rapidly in lowland Indonesia, although here (especially in Kalimantan), there are large tracts of suitable habitat remaining. Forest loss is much lower in Brunei, where impacts on the species may be much less severe and much of the forest here is likely to be suitable for this species. Overall, the population is considered highly unlikely to meet or approach he threshold for listing as threatened (<10,000 mature individuals).
Trend justification: The species is commonest in the undergrowth of intact primary lowland forest. Consequently the population impact of forest cover loss is expected to be equal to or greater than the rate of loss. In the 10 years to 2021, forest cover in this species' range was reduced by 14–18%, depending on the forest cover thresholds set (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). This value does not account for the impact of forest degradation, hence the population rate of reduction from habitat loss is likely to be greater than this. Similarly, since the species is most regularly encountered in low-lying forest (eBird 2022), where losses are greater, the overall rate of population reduction is suspected to be equivalent to c.15-29% over the last ten years. This rate is also precautionarily projected over the next ten years, although beyond that rates of loss may slow as the percentage area of forest outside protected areas diminishes.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Brunei | extant | native | yes | |||
Indonesia | extant | native | yes | |||
Malaysia | extant | native | yes | |||
Thailand | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Brunei | Ulu Temburong |
Malaysia | Bako-Buntal Bay |
Malaysia | Belum-Temenggor |
Malaysia | Crocker Range |
Malaysia | Danum Valley Conservation Area |
Malaysia | Endau-Rompin |
Malaysia | Gunung Pueh |
Malaysia | Kabili-Sepilok |
Malaysia | Krau Wildlife Reserve |
Malaysia | Lambir Hills National Park |
Malaysia | Lanjak Entimau Wildlife Sanctuary |
Malaysia | Maliau Basin Conservation Area |
Malaysia | Mount Kinabalu |
Malaysia | Mulu - Buda Protected Area |
Malaysia | Niah National Park |
Malaysia | Panti forest |
Malaysia | Sadong-Saribas coast |
Malaysia | Selangor Heritage Park |
Malaysia | Similajau National Park |
Malaysia | South-east Pahang peat swamp forest |
Malaysia | Tabin Wildlife Reserve |
Malaysia | Taman Negara National Park |
Malaysia | Tanjung Datu-Samunsam Protected Area |
Malaysia | Ulu Muda |
Thailand | Bala Sector, Hala-Bala Wildlife Sanctuary |
Thailand | Chaloem Pra Kiet (Pa Phru to Daeng) |
Thailand | Hala Sector, Hala-Bala Wildlife Sanctuary and Bang Lang National Park |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Artificial/Terrestrial | Plantations | suitable | resident |
Forest | Subtropical/Tropical Moist Lowland | major | resident |
Altitude | 0 - 800 m | Occasional altitudinal limits | (max) 1160 m |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Negligible declines | Low Impact: 5 | ||||||
|
|||||||||
Agriculture & aquaculture | Annual & perennial non-timber crops - Small-holder farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Agriculture & aquaculture | Wood & pulp plantations - Agro-industry plantations | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
Biological resource use | Logging & wood harvesting - Unintentional effects: (large scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Negligible declines | Low Impact: 5 | ||||||
|
|||||||||
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 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Grey-chested Jungle-flycatcher Cyornis umbratilis. Downloaded from
https://datazone.birdlife.org/species/factsheet/grey-chested-jungle-flycatcher-cyornis-umbratilis on 23/12/2024.
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 23/12/2024.