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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
Sanderling Calidris alba	LC	winter	2003	present	A4i

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
Energy production and mining	past (and unlikely to return) and no longer limiting	majority/most of area/population (50-90%)	no or imperceptible deterioration	low

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%)	Unknown	Unknown	negligible

Year	Protected Area	Designation	% overlap with IBA
-	Tonegawa / Hazaki Wildlife Protection Area (Local)	Other	-
1959	Suigo-Tsukuba	国定公園	69
1978	Ibaraki Prefectural Marine Zone Fisheries Coordination Regulations Article42 (iii) of the table	保護水面	1
2003	Common fishery right area(Ibaraki)	共同漁業権区域	2

Habitat1	Habitat detail	% of IBA
Marine Intertidal		major (>10)
Marine Neritic		major (>10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tonegawa estuary, Hazaki coast (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/tonegawa-estuary-hazaki-coast-iba-japan on 24/11/2024.