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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 IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Japanese Woodpigeon Columba janthina	LC	resident (2003)	present	A2
Japanese Murrelet Synthliboramphus wumizusume	VU	breeding (2003)	present	A1, A4ii
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 key 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 deteri­oration (1–10% over 3 gener­ations)	medium

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Whole area of site (>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	Some limited conservation initiatives are in place	medium

Year	Protected Area	Designation (management category)	% coverage of IBA
1936	Fuji hakone izu	国立公園 (V)	100
1952	Niijima	都道府県指定鳥獣保護区 (IV)	100

Habitat	% of IBA	Habitat detail
Forest	-
Marine Coastal/Supratidal	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Niijima and Shikinejima Islands (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/niijima-and-shikinejima-islands-iba-japan on 22/01/2025.