NT
Tanimbar Flycatcher Ficedula riedeli



Taxonomy

Taxonomic note

F. riedeli (del Hoyo and Collar 2016) was previously considered conspecific with F. dumetoria following Sibley and Monroe (1990, 1993), but molecular evidence suggests a closer relationship to F. platenae (Outlaw and Voelker 2006); differs from F. dumetoria by its slightly stronger vs duller black crown, ear-coverts and mantle (1), with striking white supercilium (but this matched in some dumetoria; ns); slightly paler upper throat (1); slightly darker, richer rufous breast (1); and (based in part on published description (Eaton et al. 2016), in part on single recording) song with three notes, the first longest, at roughly similar pitch, thus a rhythmic “seee-tsee-wee”, vs song with 3–4 rising and falling notes, often ending on higher-pitched stressed note, thus some notes not overlapping in frequency range (3); plus call a single “seee” vs double “ssit-ssit” or “ssit-truk” (Eaton et al. 2016) (2). Monotypic.

 

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
2023 Near Threatened B1b(i,ii,iii)
2018 Least Concern
2016 Least Concern
2012 Not Recognised
2008 Not Recognised
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency high
Land-mass type Average mass 9 g
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 5,000 km2 medium
Area of Occupancy (breeding/resident) 3,920 km2
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 25000-50000 mature individuals poor inferred 2022
Population trend decreasing poor suspected 2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods) 5-12% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 5-12% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 5-12% - - -
Generation length 2.6 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The global population size has not previously been quantified, but the species is described as moderately common (Coates and Bishop 1997; Eaton et al. 2016, 2021). Within this species' range, c. 2,600 km2 of forest remains (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). This species was formerly considered conspecific with F. dumetoria, which has been recorded at densities of c. 30 individuals/km2 (Fogden 1976); applying this density to the present species, and assuming approximately 50-100% of forest is occupied, the population is estimated at c. 39,000-78,000 individuals, or c. 25,000-50,000 mature individuals. These numbers, however, require confirmation with species-specific data.

Trend justification: Data on population trends are lacking but moderate declines are suspected on the basis of ongoing forest loss. Remote sensing data (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein) indicate that in the three generations to 2022, forest cover in the species' range reduced by c. 7%. This species is considered forest dependent (Haryoko et al. 2021), and these forest losses are suspected of having had a broadly similar (5-12%) reduction in the species' population size, with degradation also a potential additive risk for this species given its preference for darker areas of forest. Forest cover loss appears to be ongoing and the same rate is therefore projected into the future.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Indonesia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 320 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
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Future Minority (<50%) Rapid Declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2024) Species factsheet: Tanimbar Flycatcher Ficedula riedeli. Downloaded from https://datazone.birdlife.org/species/factsheet/tanimbar-flycatcher-ficedula-riedeli on 22/12/2024.
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 22/12/2024.