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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
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

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.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Transportation and service corridors	happening now	some of area/population (10-49%)	moderate to rapid deterioration	high

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

Habitat1	Habitat detail	% of IBA
Forest		-

1. IUCN Habitat classification.

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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 23/11/2024.