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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
Japanese Woodpigeon Columba janthina	LC	resident (2003)	present	A2
Pleske's Grasshopper-warbler Helopsaltes pleskei	VU	breeding (2003)	present	A1
Ijima's Leaf-warbler Phylloscopus ijimae	VU	breeding (2003)	present	A1, A2
Izu Thrush Turdus celaenops	VU	resident (2003)	present	A1, A2

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.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Transportation and service corridors	happe­ning now	some of popul­ation/area (10–49%)	moderate decline (10–30% over 3 gener­ations)	high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Little/none of area covered (<10%)	Unknown	Unknown	very low

Habitat	% of IBA	Habitat detail
Forest	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Aogashima island (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/aogashima-island-iba-japan on 23/12/2024.