IUCN Red List Criteria
| Critically Endangered |
C2a(i) |
| Endangered |
A3bcd+4bcd;B1ab(i,ii,iii,iv,v);C2a(i);D |
| Vulnerable |
A2bcd+3bcd+4bcd;B1ab(i,ii,iii,iv,v);C2a(i);D1 |
IUCN Red List history
| Year |
Category |
| 2012 |
Critically Endangered |
| 2008 |
Endangered |
| 2004 |
Endangered |
| 2000 |
Endangered |
| 1996 |
Endangered |
| 1994 |
Endangered |
| 1988 |
Lower Risk/Least Concern |
Species attributes
| Migratory status |
not a migrant |
Forest dependency |
High |
| Land mass type |
shelf island
|
Average mass |
- |
Distribution
| |
Estimate |
Data quality |
| Extent of Occurrence breeding/resident (km2) |
620 |
medium |
| Number of locations |
2-5 |
- |
| Fragmentation |
|
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
50-249 |
poor |
Estimated |
2012 |
| Population trend |
Decreasing |
poor |
|
- |
| Number of subpopulations |
|
- |
- |
- |
| Largest subpopulation |
1-50 |
- |
- |
- |
| Generation length (yrs) |
5.4 |
- |
- |
- |
|
Population justification: The population was previously estimated at fewer than 1,000 mature individuals (BirdLife International 2001), but more recent observations indicate that there could now be fewer than 250 mature individuals remaining, thus the population is now placed in the band for 50-249 mature individuals, probably equivalent to a total population of 75-375 individuals. |
|
Trend justification: This species is suspected to be declining rapidly owing to the on-going loss of remaining forest fragments within its small range, as well as hunting pressure. As habitat continues to be lost, the rate of decline is thought to be accelerating. |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Philippines |
Native |
No |
Yes |
|
|
Important Bird Areas where this species has triggered the IBA criteria
| Country/Territory |
IBA Name |
IBA link |
| Philippines |
Sibutu and Tumindao Islands |
 |
| Philippines |
Simunul and Manuk Manka Islands |
|
| Philippines |
Tawi-tawi Island |
|
Habitats & altitude
| Habitat (level 1) |
Habitat (level 2) |
Importance |
Occurrence |
| Artificial/Aquatic & Marine |
|
suitable |
resident |
| Forest |
Subtropical/Tropical Mangrove Vegetation Above High Tide Level |
major |
resident |
| Forest |
Subtropical/Tropical Moist Lowland |
major |
resident |
|
Altitude
|
0 - 0 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Residential & commercial development |
Commercial & industrial areas |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Agro-industry farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Scale Unknown/Unrecorded |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Small-holder farming |
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: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Majority (50-90%) |
Rapid Declines |
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%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success, Species mortality |
|
Utilisation
| Purpose |
Primary form used |
Life stage used |
Source |
Scale |
Level |
Timing |
| Sport |
Whole |
Adults and juveniles |
Wild |
Subsistence, National |
Non-trivial |
Recent |
| Sport |
Whole |
Adults and juveniles |
Wild |
Subsistence, National |
Non-trivial |
Recent |
Recommended citation
BirdLife International (2013) Species factsheet: Prioniturus verticalis. 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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