LC
Japanese Buzzard Buteo japonicus



Taxonomy

Taxonomic note
Buteo buteo, B. japonicus and B. refectus (del Hoyo and Collar 2014) were previously lumped as B. buteo following Sibley and Monroe (1990, 1993).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions 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
2021 Least Concern
2016 Least Concern
2014 Least Concern
Species attributes

Migratory status full migrant Forest dependency Low
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 12,700,000 medium
Extent of Occurrence non-breeding (km2) 13,400,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals unknown 0
Population trend Unknown not applicable -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 7.64 - - -

Population justification: Very little is known about the global population size given recent taxonomic splits. Around 85 pairs of the toyoshimai race were estimated to occur throughout the Bonin Islands in 2000 (Suzuki & Kato 2000). There is no data on population size or trends for the oshiroi race, however it is very rare and has been listed as Critically Endangered on the Red List of Threatened Species of Japan. Up to 800 pairs of the nominate race are estimated to occur in the southern Sikhote-Alin region of Primorskii Province, and more than 1,000 individuals were counted during spring migration in the valley of the lower Razdolnaya River near Ussuriysk (Shokhrin et al. 2020). 

Trend justification: Very little is known about population trends due to recent taxonomic splits and uncertainty over the impacts of habitat modification on population sizes. 


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Bangladesh V Extant Yes
Bhutan N Extant Yes
Brunei V Extant Yes
Cambodia N Extant Yes
China (mainland) N Extant Yes Yes Yes
Hong Kong (China) N Extant Yes
Indonesia V Extant Yes
Japan N Extant Yes
Kazakhstan N Extant Yes
Laos N Extant Yes
Malaysia N Extant Yes
Maldives V Extant Yes
Mongolia N Extant Yes Yes
Myanmar N Extant Yes
North Korea N Extant Yes Yes
Northern Mariana Islands (to USA) V Extant Yes
Pakistan N Extant Yes
Palau U Extant
Philippines V Extant Yes
Russia N Extant Yes Yes
Russia (Asian) N Extant Yes
Singapore N Extant Yes
South Korea N Extant Yes Yes
Taiwan, China N Extant Yes
Thailand N Extant Yes
Vietnam N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Pastureland suitable resident
Forest Subtropical/Tropical Moist Lowland suitable non-breeding
Forest Subtropical/Tropical Moist Montane suitable non-breeding
Forest Temperate suitable resident
Grassland Subtropical/Tropical Dry suitable passage
Shrubland Temperate suitable resident
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable resident
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) suitable passage
Altitude 0 - 2500 m Occasional altitudinal limits (max) 4500 m

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Motivation Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Unspecified species Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Transportation & service corridors Utility & service lines Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Buteo japonicus. Downloaded from http://www.birdlife.org on 22/05/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/05/2022.