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

Taxonomic note

Phylloscopus sumatrensis and P. grammiceps (del Hoyo and Collar 2016) were previously lumped as Seicercus grammiceps following Sibley & Monroe (1990, 1993).

 

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
2024	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	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	61,700 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.02 years	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be locally common (MacKinnon and Phillipps 1995). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 1.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). It is therefore tentatively suspected that this rate of cover loss may have led to a decline of between 1-19% in the species' population size over the same time frame, with a best estimate of reduction being less than 5%.

Trend justification:   .

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

Country/Territory	IBA Name
Indonesia	Bali Barat
Indonesia	Dataran Tinggi Hyang
Indonesia	Gunung Bromo Tengger-Semeru
Indonesia	Gunung Burangrang - Tangkuban Perahu
Indonesia	Gunung Cikurai
Indonesia	Gunung Gede - Pangrango
Indonesia	Gunung Halimun
Indonesia	Gunung Ijen
Indonesia	Gunung Kawi-Kelud
Indonesia	Gunung Malabar
Indonesia	Gunung Masigit-Kareumbi
Indonesia	Gunung Papandayan-Kamojang
Indonesia	Gunung Salak
Indonesia	Gunung Slamet
Indonesia	Gunung Tilu-Simpang
Indonesia	Pegunungan Dieng
Indonesia	Tahura R. Soerjo
Indonesia	Telaga Warna-Cibulao

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	800 - 2500 m	Occasional altitudinal limits

Purpose	Scale
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Javan Warbler Phylloscopus grammiceps. Downloaded from https://datazone.birdlife.org/species/factsheet/javan-warbler-phylloscopus-grammiceps 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.