Russet-backed Warbling-flycatcher (Eumyias oscillans)

Russet-backed Warbling-flycatcher Eumyias oscillans

Current view: Data table and detailed info

Taxonomy

Taxonomic note

Unpublished genetic data (Frank Rheindt in litt. via WGAC) clearly place all Cyornis east of Wallace’s Line within Eumyias. To prevent the common names ‘jungle-flycatcher’ or ‘blue-flycatcher’ being applied to species in two different genera, these species are given the common name ‘warbling-flycatcher’. Cyornis oscillans and C. stresemanni (del Hoyo and Collar 2016) were previously lumped as Rhinomyias oscillans following Sibley and Monroe (1990, 1993). Usually considered conspecific with E. stresemanni (see related note/s). Affinity of birds on Sumbawa unclear; tentatively included here. Monotypic.

Taxonomic source(s)
Handbook of the Birds of the World and BirdLife International. 2022. Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 7. Available at: https://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v7_Dec22.zip.

IUCN Red List criteria met and history

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	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	medium
Land-mass type		Average mass	-

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	56,700 km²
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	poor	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.91 years	-	-	-

Population justification: The population size ihas not been quantified, but the species is described as uncommon or locally common (del Hoyo et al. 2006). This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 2.7% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification: .

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
Indonesia	Egon Ilimedo
Indonesia	Gapong
Indonesia	Mbeliling - Tanjung Kerita Mese
Indonesia	Puncak Ngengas
Indonesia	Ruteng
Indonesia	Tatar Sepang
Indonesia	Todo Repok

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	370 - 1500 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Russet-backed Warbling-flycatcher Eumyias oscillans. Downloaded from https://datazone.birdlife.org/species/factsheet/russet-backed-warbling-flycatcher-eumyias-oscillans 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.