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

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
-	-	A2ce+3ce+4ce; C1

Red List history

Year	Category	Criteria
2018	Vulnerable	A2ce+3ce+4ce; C1
2016	Vulnerable	A2ce+3ce+4ce;C1
2012	Vulnerable	A2ce+3ce+4ce;C1
2008	Vulnerable	A2c,e; A3c,e; A4c,e; C1
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	high
Land-mass type	shelf island	Average mass	84 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	256,000 km2	medium
Extent of Occurrence (non-breeding)	271,000 km2	medium
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	medium	estimated	2000
Population trend	decreasing	poor	estimated	1998-2008
Rate of change over the past 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Generation length	6.1 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: The global population is estimated to be in the band c.2,500-9,999 mature individuals (BirdLife International 2001), equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals. The population in Japan has been estimated at c.100-10,000 breeding pairs (Brazil 2009).

Trend justification: On islands affected most heavily by introduced predators, population declines have been rapid; for example surveys on Miyake-jima showed declines from 24.4, 23.4 and 33.3 individuals per km in 1978-1980, to 6.7 and 11.1 individuals per km in 1990-1991. These results suggest a rapid decline is likely to be occurring across the population.

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

Country/Territory	IBA Name
Japan	Aogashima island
Japan	Hachijojima island
Japan	Kozushima island
Japan	Mikurajima island
Japan	Miyakejima island
Japan	Niijima and Shikinejima Islands
Japan	Oshima island
Japan	Tokara islands
Japan	Toshima island

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	suitable	non-breeding
Artificial/Terrestrial	Rural Gardens	suitable	non-breeding
Forest	Temperate	major	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Geological events	Volcanoes	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Mustela sibirica	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Corvus macrorhynchos_old	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Residential & commercial development	Tourism & recreation areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Izu Thrush Turdus celaenops. Downloaded from https://datazone.birdlife.org/species/factsheet/izu-thrush-turdus-celaenops on 23/11/2024.
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 23/11/2024.