EN
Blakiston's Eagle-owl Bubo blakistoni



Taxonomy

Taxonomic note
Bubo blakistoni (del Hoyo and Collar 2014) was previously placed in the genus Ketupa.

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(i) A2cd+3cd+4cd;C2a(i)

Red List history
Year Category Criteria
2016 Endangered C2a(i)
2013 Endangered C2a(i)
2012 Endangered C2a(i)
2008 Endangered C2a(i)
2005 Endangered
2004 Endangered
2000 Endangered
1996 Endangered
1994 Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Land-mass type - continent
Land-mass type - shelf island
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 5,220,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 medium estimated 2000
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 5.7 - - -

Population justification: The global population is estimated to number a few thousand birds, based on estimates of 250-400 in Primorye alone [or up to 80 pairs] (J. Slaght in litt. 2012). It is precautionarily placed in the band 1,000-2,499 mature individuals, equating to 1,500-3,749 individuals in total, rounded here to 1,500-4,000 individuals. The total population size in Japan is 140 individuals (Hayashi in litt. 2016). Surveys throughout its range are required to gain a more accurate estimate than this.

Trend justification: A number of threats exist which impact negatively upon this species, owing to its requirement for clean, stocked, relatively undisturbed waterways. Hence it is suspected to be declining rapidly.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
China (mainland) N Extant Yes
Japan N Extant Yes
Russia N Extant Yes
Russia (Asian) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
China (mainland) Dashanzuizi
China (mainland) Liangshui Nature Reserve
China (mainland) Nanweng He Nature Reserve
China (mainland) Xunbiela He Nature Reserve
Japan Shiretoko, Mount Syari-dake
Russia (Asian) Inya valley
Russia (Asian) Lesser Kuril Ridge and Kunashir Island
Russia (Asian) Middle reaches of the Bikin river
Russia (Asian) Middle reaches of the Iman river
Russia (Asian) Mukhtel' lake
Russia (Asian) Udyl' lake

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland suitable resident
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) major resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Marine & freshwater aquaculture Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Biological resource use Fishing & harvesting aquatic resources Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Indirect ecosystem effects
Biological resource use Fishing & harvesting aquatic resources Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Biological resource use Hunting & trapping terrestrial animals Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Inbreeding
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species disturbance
Natural system modifications Dams & water management/use Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem conversion
Pollution Industrial & military effluents Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Residential & commercial development Housing & urban 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%) Negligible declines Low Impact: 4
Stresses
Species mortality
Transportation & service corridors Utility & service lines Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Non-trivial Recent
Pets Whole Adults and juveniles Wild International Trivial Recent

Recommended citation
BirdLife International (2019) Species factsheet: Bubo blakistoni. Downloaded from http://www.birdlife.org on 25/03/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/03/2019.