IUCN Red List Criteria
| Near Threatened (criteria nearly met) |
C1 |
IUCN Red List history
| Year |
Category |
| 2012 |
Near Threatened |
| 2008 |
Near Threatened |
| 2004 |
Near Threatened |
| 2000 |
Lower Risk/Near Threatened |
| 1994 |
Lower Risk/Near Threatened |
| 1988 |
Lower Risk/Least Concern |
Species attributes
| Migratory status |
full migrant |
Forest dependency |
Medium |
| Land mass type |
shelf island
|
Average mass |
- |
Distribution
| |
Estimate |
Data quality |
| Extent of Occurrence breeding/resident (km2) |
40,400 |
medium |
| Number of locations |
|
- |
| Fragmentation |
|
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
Unknown |
not applicable |
Not Applicable |
0 |
| Population trend |
Decreasing |
poor |
|
- |
| Number of subpopulations |
|
- |
- |
- |
| Largest subpopulation |
|
- |
- |
- |
| Generation length (yrs) |
4.2 |
- |
- |
- |
Population justification: The global population size has not been quantified, but the species is described as rare on Taiwan (China), uncommon on the Batanes islands and common in the Ryukyu islands (Gibbs et al. 2001). Brazil (2009) has estimated national population sizes at riukiuensis) and c.10,000-100,000 breeding pairs in Japan.
The global population size has not been quantified, but the species is described as rare on Taiwan (China), uncommon on the Batanes islands and common in the Ryukyu islands (Gibbs et al. 2001). Brazil (2009) has estimated national population sizes at < c.10,000 breeding pairs in Taiwan and (for the subspecies riukiuensis) and c.10,000-100,000 breeding pairs in Japan. |
|
Trend justification: The species is suspected to be declining at a slow to moderate rate, owing to hunting and habitat degradation. |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Japan |
Native |
No |
|
|
|
| Philippines |
Native |
No |
|
|
|
| Taiwan (China) |
Native |
No |
|
|
|
Habitats & altitude
| Habitat (level 1) |
Habitat (level 2) |
Importance |
Occurrence |
| Artificial/Terrestrial |
Rural Gardens |
suitable |
non-breeding |
| Artificial/Terrestrial |
Rural Gardens |
suitable |
breeding |
| Artificial/Terrestrial |
Urban Areas |
suitable |
non-breeding |
| Artificial/Terrestrial |
Urban Areas |
suitable |
breeding |
| Forest |
Subtropical/Tropical Moist Lowland |
major |
non-breeding |
| Forest |
Subtropical/Tropical Moist Lowland |
major |
breeding |
|
Altitude
|
0 - 2000 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Residential & commercial development |
Tourism & recreation areas |
Timing |
Scope |
Severity |
Impact |
| Future |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 3 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Hunting & trapping terrestrial animals / Intentional use (species is the target) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Slow, Significant Decline |
Medium Impact: |
| Stresses |
|---|
| Species mortality |
|
Utilisation
| Purpose |
Primary form used |
Life stage used |
Source |
Scale |
Level |
Timing |
| Food (human) |
Whole |
Adults and juveniles |
Wild |
Subsistence, National |
Non-trivial |
Recent |
Recommended citation
BirdLife International (2013) Species factsheet: Treron formosae. Downloaded from
http://www.birdlife.org on 26/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 26/05/2013.
This information is based upon, and updates, the information published in BirdLife International (2000)
Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004)
Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
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