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Pleske's Grasshopper-warbler Locustella pleskei
BirdLife is updating this factsheet for the 2016 Red List
Please email us with any relevant information

IUCN Red List Criteria

Critically Endangered  
Vulnerable C2a(i) 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type shelf island
Average mass -


  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,100 medium
Extent of Occurrence non-breeding (km2) 1,100 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor Estimated 2000
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 3.7 - - -
Population justification: The global population size is 'unlikely to be much more than a few thousand individuals' (BirdLife International 2001), while national population estimates include: < c.100 breeding pairs and < c.1,000 individuals on migration in China; < c.50 individuals on migration and < c.50 wintering individuals in Taiwan; c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Korea; c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Japan and c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Russia (Brazil 2009). The total population is placed in the band 2,500-9,999 mature individuals, equating to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.
Trend justification: Various human activities are negatively affecting both breeding and wintering habitats for this species, suggesting that moderate population declines are likely to be continuing.

Country/Territory distribution

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

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Hong Kong (China) Inner Deep Bay and Shenzhen River catchment area site factsheet
Japan Aogashima island site factsheet
Japan Birojima islet site factsheet
Japan Danjo islands site factsheet
Japan Hachijojima island site factsheet
Japan Hakata bay site factsheet
Japan Kii Nagashima islets site factsheet
Japan Koshikijima islands site factsheet
Japan Kozushima island site factsheet
Japan Mikurajima island site factsheet
Japan Miyakejima island site factsheet
Japan Niijima and Shikinejima Islands site factsheet
Japan Okikojima islet site factsheet
Japan Okinoshima and Koyajima islets site factsheet
Japan Oshima island site factsheet
Japan Toshima island site factsheet
Japan Tsukuejima islets site factsheet
Japan Tsushima islands site factsheet
Russia (Asian) Islands in Peter the Great bay site factsheet
South Korea Chilbal-do island site factsheet
South Korea Kukul-do island site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Shrubland Subtropical/Tropical Dry major breeding
Shrubland Temperate major breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major non-breeding
Altitude 0 - 350 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 Minority (<50%) Slow, Significant Decline Low Impact: 5
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
Species mortality
Geological events Volcanoes Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Very Rapid Declines Past Impact
Ecosystem degradation, Ecosystem conversion
Pollution Domestic & urban waste water / Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Ecosystem degradation, Reduced reproductive success, Species mortality
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Species disturbance, Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2016) Species factsheet: Locustella pleskei. Downloaded from on 23/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 23/10/2016.

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 Vulnerable
Family Sylviidae (Old World warblers)
Species name author Taczanowski, 1889
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 1,100 km2
Country endemic? No
Links to further information
- Summary information on this species