IUCN Red List Criteria
| Critically Endangered |
|
| Endangered |
|
| Vulnerable |
D1+2 |
IUCN Red List history
| Year |
Category |
| 2012 |
Vulnerable |
| 2008 |
Endangered |
| 2006 |
Endangered |
| 2004 |
Endangered |
| 2000 |
Endangered |
| 1996 |
Critically Endangered |
| 1994 |
Critically Endangered |
| 1988 |
Threatened |
Species attributes
| Migratory status |
not a migrant |
Forest dependency |
High |
| Land mass type |
|
Average mass |
23 g
|
Distribution
| |
Estimate |
Data quality |
| Extent of Occurrence breeding/resident (km2) |
2 |
medium |
| Number of locations |
2 |
- |
| Fragmentation |
|
- |
Population & trend
| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
310 |
good |
Observed |
2007 |
| Population trend |
Stable |
good |
|
- |
| Number of subpopulations |
2 |
- |
- |
- |
| Largest subpopulation |
255 |
- |
- |
- |
| Generation length (yrs) |
6.9 |
- |
- |
- |
Population justification: The population was estimated at 296-300 in August 2004, but a subsequent series of devastating cyclones in early 2005 lead to a decline, especially on Rarotonga. The total population began to increase in 2007 due to good recruitment on Atiu (where 30 birds were transferred in 2001-2003) and a stable population on Rarotonga. In 2011 the population was estimated at c.380 birds, including 69 yearlings (Robertson et al. 2011, H. Robertson in litt. 2011), suggesting a population of c.310 mature individuals.
|
|
Trend justification: The population has grown rapidly owing to intensive management, particularly predator control, and the transfer of 30 young birds to Atiu Island in 2001-2003. The population on Rarotonga declined as a result of five cyclones in one month in early 2005, and subsequent poor breeding in 2005-2006; however, the population has now been increasing since 2007, owing to intensive conservation action. |
Country/Territory distribution
| Country/Territory |
Occurrence status |
Extinct |
Breeding |
Non-breeding |
Passage |
| Cook Islands |
Native |
No |
Yes |
|
|
Habitats & altitude
| Habitat (level 1) |
Habitat (level 2) |
Importance |
Occurrence |
| Forest |
Subtropical/Tropical Moist Lowland |
major |
resident |
|
Altitude
|
100 - 250 m
|
Occasional altitudinal limits
|
|
Threats & impact
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) |
Timing |
Scope |
Severity |
Impact |
| Past, Likely to Return |
Majority (50-90%) |
Slow, Significant Decline |
Past Impact |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Invasive non-native/alien species/diseases |
Problematic native species/diseases |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Whole (>90%) |
Unknown |
Unknown |
| Stresses |
|---|
| Species mortality |
|
| Invasive non-native/alien species/diseases |
Problematic native species/diseases / Brown Tree Snake (Boiga irregularis) |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Species mortality |
|
| Invasive non-native/alien species/diseases |
Problematic native species/diseases / Small Asian Mongoose (Herpestes javanicus) |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Black Rat (Rattus rattus) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Whole (>90%) |
No decline |
Medium Impact: |
| Stresses |
|---|
| Reduced reproductive success |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Unspecified micro-organisms |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Species mortality |
|
| Invasive non-native/alien species/diseases |
Invasive non-native/alien species/diseases / Unspecified plants |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Climate change & severe weather |
Storms & flooding |
Timing |
Scope |
Severity |
Impact |
| Future |
Whole (>90%) |
Rapid Declines |
Medium Impact: |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
Recommended citation
BirdLife International (2013) Species factsheet: Pomarea dimidiata. Downloaded from
http://www.birdlife.org on 21/05/2013.
Recommended citation for factsheets for more than one species: BirdLife International (2013) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 21/05/2013.
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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