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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 ('triggering') IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
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
Northern Pintail Anas acuta	LC	passage (2003)	present	A4i

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
Artificial/Terrestrial	good (>90%)	good (>90%)	good

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
No known threats	past (and unlikely to return) and no longer limiting	few indivi­duals/small area (<10%)	no or slight decline (<1% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Little/none of area 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
1986	Mawarizeki	都道府県指定鳥獣保護区 (IV)	43
1990	Sunazawa	都道府県指定鳥獣保護区 (IV)	5

Habitat	% of IBA	Habitat detail
Artificial/Terrestrial	-	Rice paddies
Wetlands (inland)	-	Artificial wetlands

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Mawarizeki and Sunazawa reservoir (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/mawarizeki-and-sunazawa-reservoir-iba-japan on 23/12/2024.