Current view: Data table and detailed info
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
Red List history
Migratory status |
not a migrant |
Forest dependency |
high |
Land-mass type |
|
Average mass |
9 g |
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
Important Bird and Biodiversity Areas (IBA)
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.