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Location Northern Mariana Islands (to USA), Northern Islands
Central coordinates 145o 50.00' East  17o 36.00' North
IBA criteria A1, A2
Area 1,520 ha
Altitude 0 - 774m
Year of IBA assessment 2007

Site description The proposed Alamagan Island IBA is one of only two islands with extant populations of Nightingale Reed Warblers. The interior of the island has steep slopes cut by steep ravines; other areas are grassland or bare lava flows.

Key Biodiversity The entire island of Alamagan (Figure 18) is proposed as an IBA under A1 and A2 criteria, specifically for its population of Nightingale Reed Warblers. The island is also home to Micronesian Megapodes, White-throated Ground-Doves, Collared Kingfishers, Micronesian Starlings, and Micronesian Honeyeaters. Currently, populations of Nightingale Reed Warblers are found only on Saipan and Alamagan (DFW, 2007a), with approximately 100 pairs residing on Alamagan. Although Micronesian Megapodes and Nightingale Reed-Warblers prefer to use forested areas, the entire island is proposed as an IBA due to its small size.

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 
Nightingale Reed-warbler Acrocephalus luscinius resident  100 breeding pairs  unknown  A1, A2  Critically Endangered 
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
Residential and commercial development housing and urban areas likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium

Protection status There are no protected areas at present.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Alamagan Island. Downloaded from on 28/10/2016

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