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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
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

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2015) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Marine Coastal/Supratidal	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Geological events	likely in long term (beyond 4 years)	whole area/population (>90%)	slow but significant deterioration	medium
Transportation and service corridors	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Invasive and other problematic species and genes	happening now	small area/few individuals (<10%)	slow but significant deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other 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

Year	Protected Area	Designation	% overlap with IBA
-	Kiritappu Marsh	Reserve	31
1955	Akkeshi	都道府県立自然公園	89
1976	Kushiro tobu	沿岸水産資源開発区域	10
1993	Akkeshi-Bekanbeushi-Kiritappu	国指定鳥獣保護区	42
1993	Kiritappu-shitsugen	Ramsar Site, Wetland of International Importance	27
2013	Common fishery right area(Hokkaido)	共同漁業権区域	10

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		major (>10)
Marine Intertidal		major (>10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Kiritappu marsh, Biwase bay (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/kiritappu-marsh-biwase-bay-iba-japan on 23/11/2024.