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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
Whooper Swan Cygnus cygnus	LC	passage	2003	present	A4i
Tundra Swan Cygnus columbianus	LC	passage	2003	present	A4i
Bean Goose Anser fabalis	LC	passage	2003	present	A4i
Greater White-fronted Goose Anser albifrons	LC	passage	2003	present	A4i
A4iii Species group - waterbirds	n/a	passage	2003	min 20,000 individuals	A4iii

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
Wetlands (inland)	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	some of area/population (10-49%)	very rapid to severe deterioration	high
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high
Pollution	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Little/none of site covered (<10%)	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation	% overlap with IBA
2002	Miyajimanuma	国指定鳥獣保護区	<1
2002	Miyajima-numa	Ramsar Site, Wetland of International Importance	<1

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Freshwater lakes and pools	-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Middle Ishikari River basin (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/middle-ishikari-river-basin-iba-japan on 22/11/2024.