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Blakiston's Eagle-owl Bubo blakistoni

IUCN Red List Criteria

Critically Endangered  
Endangered A2cd+3cd+4cd;C2a(i) 
Vulnerable C2a(i) 

IUCN Red List history

Year Category
2013 Endangered
2012 Endangered
2008 Endangered
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 continent
shelf island
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,870,000 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 medium Estimated 2000
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 51-250 - - -
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 (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. 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 Breeding Non-breeding Passage Resident
China (mainland) Native Extant       Yes
Japan Native Extant       Yes
Russia (Asian) Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
China (mainland) Dashanzuizi site factsheet
China (mainland) Liangshui Nature Reserve site factsheet
China (mainland) Nanweng He Nature Reserve site factsheet
China (mainland) Xunbiela He Nature Reserve site factsheet
Japan Shiretoko, Mount Syari-dake site factsheet
Russia (Asian) Inya valley site factsheet
Russia (Asian) Kunashir island site factsheet
Russia (Asian) Middle reaches of the Bikin river site factsheet
Russia (Asian) Middle reaches of the Iman river site factsheet
Russia (Asian) Mukhtel' lake site factsheet
Russia (Asian) Udyl' lake site factsheet

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 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Marine & freshwater aquaculture / Industrial aquaculture Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species mortality
Biological resource use Fishing & harvesting aquatic resources / Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Indirect ecosystem effects
Biological resource use Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species mortality
Biological resource use Logging & wood harvesting / Unintentional effects: (large scale) [harvest] 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 Decline Low Impact: 5
Stresses
Species disturbance
Natural system modifications Dams & water management/use / Dams (size unknown) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem conversion
Pollution Industrial & military effluents / Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline 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 Decline 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 Subsistence, National Non-trivial Recent
Pets Whole Adults and juveniles Wild International Trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Bubo blakistoni. Downloaded from http://www.birdlife.org on 28/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/08/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Endangered
Family Strigidae (Typical Owls)
Species name author (Seebohm, 1884)
Population size 1000-2499 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 2,870,000 km2
Country endemic? No
Links to further information
- Summary information on this species