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Location Northern Mariana Islands (to USA), Northern Islands
Central coordinates 145o 41.00' East  19o 43.00' North
IBA criteria A1, A2
Area 976 ha
Altitude 0 - 857m
Year of IBA assessment 2007

Site description The proposed Asuncion Island IBA is an uninhabited island and free of introduced large mammals. Asuncion Island is protected by CNMI law. Asuncion maintains some of the largest stands of native forest in the Northern Islands.

Key Biodiversity The entire island of Asuncion (Figure 17) is proposed as an IBA under A1 and A2 criteria. The island is home to Micronesian Megapodes, White-throated Ground-Doves, Micronesian Starlings, Collared Kingfishers, and Micronesian Honeyeaters.

Non-bird biodiversity: Falanruw (1989) described Asuncion as being unique among the northern islands in having a native forest type, the main species of which was endemic. A common tree species is Terminalia rostrata, which in 1989 was only known from Asuncion. The island also harbors many coconut crabs. The island also provides habitat for the endangered skink Emoia slevini, which in 1989 was only known from Rota, Tinian, and Guam. In addition, Falanruw (1989) described Asuncion as providing the largest area of sheltered habitat for native, endemic, and endangered fauna in the northern islands.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Micronesian Scrubfowl Megapodius laperouse resident  present  A1, A2  Endangered 
White-throated Ground-dove Alopecoenas xanthonurus resident  present  A1, A2  Near Threatened 
Micronesian Myzomela Myzomela rubratra resident  present  A2  Least Concern 
Micronesian Starling Aplonis opaca resident  present  A2  Least Concern 

IBA Monitoring

2007 high not assessed not assessed

Invasive & other problematic species, genes & diseases invasive non-native/alien species/diseases - named species happening now majority/most of area/population (50-90%) slow but significant deterioration high

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Asuncion Island Preserve 722 protected area contained by site 722  

Protection status Formally and fully protected as Wildlife Conservation Area by the CNMI Division of Fish and Wildlife (DFW, 2007

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Asuncion Island. Downloaded from on 21/10/2016

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