NT
Yap Monarch Metabolus godeffroyi



Taxonomy

Taxonomic note
Metabolus godeffroyi (del Hoyo and Collar 2016) was previously listed as Monarcha godeffroyi.

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
- - -

Red List history
Year Category Criteria
2022 Near Threatened D2
2016 Near Threatened D2
2012 Near Threatened D2
2008 Near Threatened D2
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency medium
Land-mass type Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 184 km2 medium
Area of Occupancy (breeding/resident) 184 km2
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 10000-30000 mature individuals medium estimated 1984
Population trend stable poor suspected 1998-2008
Generation length 3.22 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: Within its small range it is considered common and widespread (Clement 2020). Engbring et al. (1990) published a population estimate of 26,961 individuals, roughly equating to 18,000 mature individuals and placed here in the range 10,000-30,000. Although there is no more recent population estimate or trend assessment, they remain among the most commonly encountered avian species on Yap (Robertson and Robertson 2016).

Trend justification: Most species surveyed on Yap in 2004 appeared to be less abundant than in Engbring et al.'s (1990) surveys (Robertson and Robertson 2016). The reasons for this are uncertain but could be attributed to Typhoon Sudall (2004), difference in survey methods or changes in habitat availability (Robertson and Robertson 2016). However, there has been no recent trend assessment and the species is thought to be common and tolerates a wide range of habitats. Remote sensing data indicate no ongoing forest loss in the three generations to 2021 (data from Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Currently the population is suspected to be stable in the absence of any recent evidence for any declines or substantial threats.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Micronesia, Federated States of extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Micronesia, Federated States of Yap Island

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Shrubland Subtropical/Tropical Moist suitable resident
Altitude 0 - 170 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - 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 - Named species Timing Scope Severity Impact
Future Whole (>90%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2024) Species factsheet: Yap Monarch Metabolus godeffroyi. Downloaded from https://datazone.birdlife.org/species/factsheet/yap-monarch-metabolus-godeffroyi on 25/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 25/12/2024.