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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
Fairy Pitta Pitta nympha	VU	breeding (2003)	present	A1

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
Forest	good (>90%)	moderate (70–90%)	near favourable

Pressure (threats to the key species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happen­ing now	some of popul­ation/area (10–49%)	slow deteri­oration (1–10% over 3 gener­ations)	medium
Biological resource use	likely in long term (beyond 4 years)	some of popul­ation/area (10–49%)	slow deteri­oration (1–10% over 3 gener­ations)	medium
Geological events	likely in long term (beyond 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
Little/none of site covered (<10%)	No manage­ment planning has taken place	Some limited conservation initiatives are in place	very low

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Middle Shimantogawa Basin Wildlife Protection Area (Local)	Other (-)	-
1982	Showa	都道府県指定鳥獣保護区 (IV)	<1
1994	Odo	都道府県指定鳥獣保護区 (IV)	<1

Habitat	% of IBA	Habitat detail
Forest	major (>10)
Wetlands (inland)	major (>10)	Riverine floodplains; Rivers and streams; Shingle and stony beaches; Freshwater lakes and pools

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Middle Shimantogawa basin (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/middle-shimantogawa-basin-iba-japan on 15/01/2025.