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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
Grey Plover Pluvialis squatarola	VU	passage	2003	present	A4i
Whimbrel Numenius phaeopus	LC	passage	2003	present	A4i
Dunlin Calidris alpina	NT	winter	2003	present	A4i
Common Greenshank Tringa nebularia	LC	winter	2003	present	A4i
Saunders's Gull Saundersilarus saundersi	VU	winter	2003	present	A1, 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 (2015) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Marine Intertidal	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Pollution	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	likely in long term (beyond 4 years)	some of area/population (10-49%)	moderate to rapid deterioration	medium

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%)	No management planning has taken place	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	low

Year	Protected Area	Designation	% overlap with IBA
2003	Common fishery right area(Saga)	共同漁業権区域	84
2003	Common fishery right area(Fukuoka)	共同漁業権区域	16
2003	Kashima shingomori	都道府県指定鳥獣保護区	<1
2015	Higashiyoka-higata	Ramsar Site, Wetland of International Importance	1
2015	Hizen Kashima-higata	Ramsar Site, Wetland of International Importance	<1

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: Inner Ariake bay (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/inner-ariake-bay-iba-japan on 23/11/2024.