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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
Invasive and other problematic species and genes	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	A compre­hensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	Substantive conservation measures are being implemented, but these are not compre­hensive and are limited by resources and capacity	high

Year	Protected Area	Designation (management category)	% coverage of IBA
1936	Fuji hakone izu	国立公園 (V)	100
1975	Oshima senzu	都道府県指定鳥獣保護区 (IV)	5

Habitat	% of IBA	Habitat detail
Forest	-

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