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Location Northern Mariana Islands (to USA), Northern Islands
Central coordinates 145o 47.00' East  16o 42.00' North
IBA criteria A1, A2
Area 578 ha
Altitude 0 - 301m
Year of IBA assessment 2007

Site description The proposed Sarigan Island IBA consistently harbours a relatively large population of Micronesian Megapodes, with up to 50% of the CNMI’s total megapode population. Sarigan is uninhabited and feral ungulates were removed from the island in 2000. The island serves as a mitigation site for military use of the Farallon de Medinilla. Vegetation on the island has returned rapidly since ungulate eradication.

Key Biodiversity The entire island of Sarigan is proposed as an IBA under A1 and A2 criteria. Sarigan has a large population of Micronesian Megapodes and may consistently harbour 50% of the total CNMI megapode population (Marshall, pers. comm.). The island is also home to White-throated Ground-Doves and has a small population of Grey Backed Terns, which are rare in the CNMI, as well as Micronesian Starlings, Collared Kingfishers, and Micronesian Honeyeaters. A small population of Common Buzzards was present on Sarigan (Reichel et al., 1994) during surveys in the 1980s and 1990s.

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 medium not assessed not assessed

Invasive & other problematic species, genes & diseases invasive non-native/alien species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Sarigan Strict Nature Reserve 490 protected area contained by site 490  

Protection status The island is formally and fully protected as a 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: Sarigan Island. Downloaded from on 25/10/2016

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