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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
Red-tailed Tropicbird Phaethon rubricauda	LC	breeding	2003	present	A4ii
Japanese Woodpigeon Columba janthina	LC	resident	2003	present	A2
Matsudaira's Storm-petrel Hydrobates matsudairae	VU	breeding	2003	present	A4ii

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
Geological events	likely in short term (within 4 years)	whole area/population (>90%)	moderate to rapid deterioration	high
Invasive and other problematic species and genes	likely in short term (within 4 years)	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Biological resource use	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Most of site (50-90%) covered (including the most critical parts for important bird species)	No management planning has taken place	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation	% overlap with IBA
1972	Ogasawara	国立公園	17
1975	Minami io jima	原生自然環境保全地域	11
2002	Common fishery right area(Tokyo)	共同漁業権区域	3
2007	Ogasawara Islands	森林生態系保護地域	25
2009	Kitaiojima	国指定鳥獣保護区	17
2011	Ogasawara Islands	World Heritage Site (natural or mixed)	28

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

1. IUCN Habitat classification.

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