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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
Black-faced Spoonbill Platalea minor	EN	winter	2003	present	A1, A4i
Whimbrel Numenius phaeopus	LC	passage	2003	present	A4i
Red-necked Stint Calidris ruficollis	NT	passage	2003	present	A4i
Dunlin Calidris alpina	NT	winter	2003	present	A4i
Terek Sandpiper Xenus cinereus	LC	passage	2003	present	A4i
Grey-tailed Tattler Tringa brevipes	LC	passage	2003	present	A4i
Common Greenshank Tringa nebularia	LC	winter	2003	present	A4i
Saunders's Gull Saundersilarus saundersi	VU	winter	2003	present	A1
Pleske's Grasshopper-warbler Helopsaltes pleskei	VU	breeding	2003	present	A1

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 Coastal/Supratidal	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	likely in long term (beyond 4 years)	majority/most of area/population (50-90%)	slow but significant deterioration	medium
Human intrusions and disturbance	likely in long term (beyond 4 years)	whole area/population (>90%)	slow but significant 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%)	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
1956	Genkai	国定公園	100
1976	Fukuoka shi	都道府県指定鳥獣保護区	93
2003	Common fishery right area(Fukuoka)	共同漁業権区域	96
2003	Wajiro higata	国指定鳥獣保護区	3

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		major (>10)
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: Hakata bay (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/hakata-bay-iba-japan on 23/11/2024.