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Japanese Night-heron Gorsachius goisagi

IUCN Red List Criteria

Critically Endangered  
Endangered C2a(i) 
Vulnerable A2cde+3cde+4cde;C2a(i);D1 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2004 Endangered
2000 Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

Migratory status full migrant Forest dependency High
Land mass type continent
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 35,800 medium
Extent of Occurrence non-breeding (km2) 283,000 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 600-1700 poor Estimated 2007
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 51-250 - - -
Generation length (yrs) 6.7 - - -
Population justification: Recent work in Japan suggests the previous assertion that the global population comprises fewer than 1,000 individuals may have been overly pessimistic (although Brazil 2009 estimated fewer than 100 breeding pairs, fewer than 50 individuals on migration and fewer than 50 wintering individuals in Japan). Hence, the true figure probably lies within the band 1,000-2,499 individuals. This equates to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals.
Trend justification: Rapid declines in the past are suspected to be on-going, mainly owing to forest loss and changing agricultural practices.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Brunei Vagrant Extant   Yes    
China (mainland) Native Extant     Yes  
Hong Kong (China) Native Extant     Yes  
Indonesia Native Extant   Yes    
Japan Native Extant Yes      
Palau Vagrant Extant   Yes    
Philippines Native Extant   Yes    
Russia (Asian) Native Extant   Yes    
South Korea Native Extant Yes Yes    
Taiwan (China) Native Extant     Yes Yes
Vietnam Vagrant Extant        

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Indonesia Gunung Mahawu Rurukan site factsheet
Indonesia Tangkoko Dua Saudara site factsheet
Philippines Central Panay mountains site factsheet
Philippines Cuernos de Negros site factsheet
Philippines Liguasan marsh site factsheet
Philippines Mount Bandila-an site factsheet
Philippines Mount Busa-Kiamba site factsheet
Philippines Mount Hamiguitan Range Wildlife Sanctuary site factsheet
Philippines Mount Hilong-hilong site factsheet
Philippines Mount Kampalili-Puting Bato site factsheet
Philippines Mount Latian complex site factsheet
Philippines Mount Malindang Natural Park site factsheet
Philippines Pasonanca Natural Park site factsheet
Philippines Quezon National Park site factsheet
Philippines University of the Philippines Land Grants (Pakil and Real) site factsheet
Philippines Victoria and Anepahan Ranges site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable non-breeding
Forest Subtropical/Tropical Dry suitable breeding
Forest Subtropical/Tropical Dry suitable non-breeding
Forest Subtropical/Tropical Moist Lowland major breeding
Forest Subtropical/Tropical Moist Lowland major non-breeding
Forest Subtropical/Tropical Moist Montane major breeding
Forest Subtropical/Tropical Moist Montane major non-breeding
Forest Temperate major breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable non-breeding
Altitude 0 - 2400 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
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: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation
Geological events Volcanoes Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Rapid Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Siberian Weasel (Mustela sibirica) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified species Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Reduced reproductive success
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent
Food (human) Whole Eggs Wild Subsistence, National Non-trivial Recent
Pets Whole Adults and juveniles Wild International Non-trivial Recent
Wearing apparel, accessories Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Gorsachius goisagi. Downloaded from http://www.birdlife.org on 27/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/08/2014.

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 Ardeidae (Herons)
Species name author (Temminck, 1835)
Population size 600-1700 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 35,800 km2
Country endemic? No
Links to further information
- Summary information on this species