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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
Bean Goose Anser fabalis	LC	winter	2003	present	A4i
Greater White-fronted Goose Anser albifrons	LC	winter	2003	present	A4i
Northern Pintail Anas acuta	LC	winter	2003	present	A4i
A4iii Species group - waterbirds	n/a	winter	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 (2010) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Human intrusions and disturbance	likely in long term (beyond 4 years)	small area/few individuals (<10%)	no or imperceptible 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	Unknown	Unknown	low

Year	Protected Area	Designation	% overlap with IBA
-	Otomonuma Wildlife Protection Area (Local)	Other	-
1998	Otomonuma	都道府県指定鳥獣保護区	95

Habitat1	Habitat detail	% of IBA
Artificial/Terrestrial		-
Wetlands (inland)	Artificial wetlands	-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Otomonuma reservoir (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/otomonuma-reservoir-iba-japan on 22/11/2024.