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Rarotonga Monarch Pomarea dimidiata

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 Presence Breeding Non-breeding Passage Resident
Cook Islands Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Cook Islands Atiu site factsheet
Cook Islands Takitumu Conservation Area, Rarotonga site factsheet

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 Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Slow, Significant Decline Past Impact
Stresses
Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Black Rat (Rattus rattus) Timing Scope Severity Impact
Ongoing Whole (>90%) No decline Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Brown Tree Snake (Boiga irregularis) Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Small Asian Mongoose (Herpestes javanicus) Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified species Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified species Timing Scope Severity Impact
Future Whole (>90%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown Unknown
Stresses
Species mortality

Recommended citation
BirdLife International (2014) Species factsheet: Pomarea dimidiata. Downloaded from http://www.birdlife.org on 23/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/09/2014.

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.

Key facts
Current IUCN Red List category Vulnerable
Family Monarchidae (Monarchs)
Species name author (Hartlaub & Finsch, 1871)
Population size 310 mature individuals
Population trend Stable
Distribution size (breeding/resident) 2 km2
Country endemic? Yes
Links to further information
- Summary information on this species