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Location Japan, Tokyo
Central coordinates 142o 8.00' East  27o 40.00' North
IBA criteria A1, A2
Area 586 ha
Altitude 0 - 159m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Mukojimaretto islets located in the north of Ogasawaragunto chain islands on the Pacific Ocean which are about 900-1,100 km south of Tokyo metropolitan area, consist of Kitanoshima, Mukojima, Nakoudojima, Yomejima and other islets. The largest Mukojima is about 2.57 km2, and the highest point is at Nakoudojima which is about 155m high. They are small and flat islets. Most forests have been lost to vegetation destruction caused by feral goats, and resulted in erosion. Since the latter half of 1990s feral goats have been exterminated, but there are still some goats that remain on the island. A vegetation recovery project has progressed at the remaining forests.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black-footed Albatross Phoebastria nigripes passage  2004  present  A1  Near Threatened 
Japanese Woodpigeon Columba janthina resident  2004  present  A2  Near Threatened 
Bonin White-eye Apalopteron familiare resident  2004  present  A2  Near Threatened 

IBA Monitoring

2010 low not assessed high
Poor - based on little, or potentially unreliable/unrepresentative, data

Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species likely in long term (beyond 4 years) small area/few individuals (<10%) no or imperceptible deterioration low

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  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  high 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ogasawara National Park 6,099 protected area contains site 586  


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Coastline Rock stacks and islands  -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Mukojima islands. Downloaded from on 24/10/2016

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