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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

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2010) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
No known threats	happe­ning now	whole of popul­ation/area (>90%)	no or slight decline (<1% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Little/none of area covered (<10%)	No management plan exists, but the management planning process has begun	Unknown	very low

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Koshikijima Islands Wildlife Protection Area (Local)	Other (-)	-
1981	Koshiki jima	都道府県立自然公園 (V)	20
1989	Kashima	都道府県指定鳥獣保護区 (IV)	3
1994	Kashima minami	都道府県指定鳥獣保護区 (IV)	4

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

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