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The site was identified as internationally important for bird conservation in 2004 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Marsh Grassbird Helopsaltes pryeri	NT	breeding (2003)	present	A1, A3
Ochre-rumped Bunting Emberiza yessoensis	NT	breeding (2003)	present	A3

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 key species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Marine Coastal/Supratidal	good (>90%)	good (>90%)	favourable

Pressure (threats to the key species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Energy production and mining	likely in short term (within 4 years)	few individ­uals/small area (<10%)	no deteri­oration (<1% over 3 gener­ations)	low

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Whole area of site (>90%) covered by appropriate conservation designation	No manage­ment planning has taken place	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation (management category)	% coverage of IBA
1965	Jusanko	都道府県指定鳥獣保護区 (IV)	92
1975	Tsugaru	国定公園 (V)	86
1986	Iwakigawa kako	都道府県指定鳥獣保護区 (IV)	9

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

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Iwakigawa river, Lake Jusanko (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/iwakigawa-river-lake-jusanko-iba-japan on 24/01/2025.