• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	5,000 km2	medium
Area of Occupancy (breeding/resident)	3,920 km2
Severely fragmented?	no	-

	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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Indonesia	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 320 m	Occasional altitudinal limits

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

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Recommended citation
BirdLife International (2024) Species factsheet: Tanimbar Flycatcher Ficedula riedeli. Downloaded from https://datazone.birdlife.org/species/factsheet/tanimbar-flycatcher-ficedula-riedeli on 22/11/2024.
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 22/11/2024.