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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
Streaked Shearwater Calonectris leucomelas	NT	breeding	2003	2,000,000 individuals	A4ii
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

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.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Forest	good (> 90%)	moderate (70-90%)	near favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other 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	% overlap with IBA
1936	Fuji hakone izu	国立公園	100
1974	Mikurajima	都道府県指定鳥獣保護区	30

Habitat1	Habitat detail	% of IBA
Forest		-
Marine Coastal/Supratidal		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Mikurajima island (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/mikurajima-island-iba-japan on 22/11/2024.