Kiritappu marsh, Biwase bay

IBA Criteria

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Red-crowned Crane Grus japonensis VU breeding 2003 present A1, A3
Latham's Snipe Gallinago hardwickii NT breeding 2003 present A3
Steller's Sea-eagle Haliaeetus pelagicus VU winter 2003 present A1
Middendorff's Grasshopper-warbler Helopsaltes ochotensis LC breeding 2003 present A3
Yellow-breasted Bunting Emberiza aureola CR breeding 2003 present A3

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2015 medium near favourable low
Was the whole site covered? Yes State assessed by Habitat
Accuracy of information -

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Geological events earthquakes/tsunamis likely in long term (beyond 4 years) whole area/population (>90%) slow but significant deterioration medium
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now small area/few individuals (<10%) slow but significant deterioration low
Transportation and service corridors roads and railroads likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Wetlands (inland) 0 0 good (> 90%) moderate (70-90%) near favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation No management planning has taken place Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity low
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Kushiro tobu 沿岸水産資源開発区域 113,325 protected area overlaps with site 0
Kiritappu-shitsugen Ramsar Site, Wetland of International Importance 2,504 protected area contained by site 2,504
Kiritappu Marsh Reserve 2,905 protected area contained by site 2,905
Common fishery right area(Hokkaido) 共同漁業権区域 4,863,624 protected area overlaps with site 0
Akkeshi-Bekanbeushi-Kiritappu 国指定鳥獣保護区 13,064 protected area overlaps with site 0
Akkeshi 都道府県立自然公園 21,523 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Rivers and streams, Raised and blanket bogs, Freshwater lakes and pools, Permanent swamps -
Marine Coastal/Supratidal -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Kiritappu marsh, Biwase bay. Downloaded from on 07/02/2023.