Sakhalin Leaf-warbler (Phylloscopus borealoides) | Details

Sakhalin Leaf-warbler Phylloscopus borealoides

Current view: Data table and detailed info

Taxonomy

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	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Species attributes

Migratory status	full migrant	Forest dependency	medium
Land-mass type		Average mass	-

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,868,000 km²
Extent of Occurrence (non-breeding)	5,726,000 km²
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.47 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The global population size has not been quantified, although its breeding range is large and the population size is accordingly not considered likely to be small.

Trend justification: Loss of its forest habitat in the breeding range is minimal (Global Forest Watch 2023, based on data from Hansen et al. [2013] and methods disclosed therein) and although is more extensive in its non-breeding range, here this species occurs in parkland and open forest types (eBird 2023). Consequently, although the species is precautionarily suspected of declining, it is thought to be doing so only very slowly.

Country/territory distribution

Country/Territory	Presence	Origin	Breeding visitor	Non-breeding visitor	Passage migrant
Cambodia	extant	native		yes	yes
China (mainland)	extant	native		yes	yes
India	extant	native		yes
Indonesia	presence uncertain	native		yes
Japan	extant	native	yes	yes	yes
Laos	extant	native		yes	yes
Malaysia	extant	native		yes	yes
Myanmar	extant	native		yes	yes
North Korea	extant	native			yes
Russia	extant	native	yes		yes
Singapore	extant	native		yes	yes
South Korea	extant	native			yes
Taiwan, China	extant	native			yes
Thailand	extant	native
Vietnam	extant	native

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Rural Gardens	suitable	non-breeding
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	non-breeding
Forest	Subtropical/Tropical Moist Lowland	major	non-breeding
Forest	Temperate	major	breeding
Altitude	0 - 1800 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Sakhalin Leaf-warbler Phylloscopus borealoides. Downloaded from https://datazone.birdlife.org/species/factsheet/sakhalin-leaf-warbler-phylloscopus-borealoides 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.