Pohnpei Cicadabird Edolisoma insperatum


Taxonomic note

Edolisoma tenuirostre, E. insperatum, E. nesiotis, E. monacha, E. rostratum, E. meyerii, E. obiense, E. grayi, E. remotum and E. salomonis (del Hoyo and Collar 2016) were previously lumped as Coracina tenuirostris following Christidis & Boles (2008) and Sibley & Monroe (1990, 1993).


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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(ii) B1ab(ii,iii,v)+2ab(ii,iii,v); C2a(ii)

Red List history
Year Category Criteria
2021 Endangered C2a(ii)
2016 Endangered C2a(ii)
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass 59 g

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,700
Extent of Occurrence breeding/resident (km2) 576
Number of locations 6-10 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 poor estimated 2016
Population trend Decreasing inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 4.1 - - -

Population justification: The global population size was estimated at 2,060 birds in 1983 (Engbring et al. 1990), but since that time a large proportion of native forest has been lost from the island. Surveys in 2012 only recorded the species eight times from 247 widely distributed survey stations (Oleiro and Kesler unpubl. report), and generally reported decreases in forest associated species. It is therefore estimated that the population is no higher than 2,060 individuals, or 1,373 mature individuals. The population is therefore placed in the band 1,000-2,499 mature individuals.

Trend justification: This species is inferred to be declining owing to ongoing forest loss and degradation from agricultural expansion and development (Oleiro and Kesler 2015). The likely rate of this decline has not been quantified.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Micronesia, Federated States of N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Micronesia, Federated States of Pohnpei Watershed Forest Reserve
Micronesia, Federated States of Pilapen Kepin River Watershed

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Marine Intertidal Mangrove Submerged Roots suitable resident
Altitude 0 - 800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Ecosystem degradation
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion
Natural system modifications Dams & water management/use - Dams (size unknown) Timing Scope Severity Impact
Future Minority (<50%) Unknown Unknown
Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Future Minority (<50%) Unknown Unknown
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Edolisoma insperatum. Downloaded from http://www.birdlife.org on 25/09/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/09/2022.