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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
Bonin White-eye Apalopteron familiare	LC	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%)	very poor (< 40%)	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Biological resource use	likely in long term (beyond 4 years)	majority/most of area/population (50-90%)	very rapid to severe deterioration	high
Geological events	likely in short term (within 4 years)	whole area/population (>90%)	moderate to rapid deterioration	high
Pollution	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Invasive and other problematic species and genes	happening now	small area/few individuals (<10%)	moderate to rapid deterioration	low

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	No management planning has taken place	Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity	low

Year	Protected Area	Designation	% overlap with IBA
1972	Ogasawara	国立公園	100
1980	Ogasawara gunto	国指定鳥獣保護区	100
2002	Common fishery right area(Tokyo)	共同漁業権区域	9
2007	Ogasawara Islands	森林生態系保護地域	57
2011	Ogasawara Islands	World Heritage Site (natural or mixed)	68

Habitat1	Habitat detail	% of IBA
Forest		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Hahajima islands (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/hahajima-islands-iba-japan on 23/11/2024.