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Location Northern Mariana Islands (to USA), Guguan Island
Central coordinates 145o 50.00' East  17o 19.00' North
IBA criteria A1, A2, A4i, A4iii
Area 412 ha
Altitude 0 - 301m
Year of IBA assessment 2012

Site description The proposed Guguan Island IBA is uninhabited and protected by CNMI law as a Wildlife Conservation Area. The volcanic island is free of large introduced mammals. The coast is bordered by steep basaltic rock with gables of high ridges which contain deep, rain-eroded gorges.

Key Biodiversity The entire island of Guguan is proposed as an IBA under A4i and A4iii criteria. The island qualifies as an IBA under A4i criteria for Grey-backed Terns and Sooty Terns. The island qualifies under A4iii criteria for its total seabird population. Guguan is also home to Micronesian Megapodes, White-throated Ground-Doves, Micronesian Starlings, Collared Kingfishers, and Micronesian Honeyeaters (DFW, 2007b).

Non-bird biodiversity: Additional rare and endangered species on the island include Mariana Fruit Bat.

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 
Grey-backed Tern Onychoprion lunatus breeding  1979-1988  1,200 breeding pairs  medium  A4i  Least Concern 
Sooty Tern Onychoprion fuscatus unknown  1979-1988  37,655 individuals  medium  A4i  Least Concern 
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 
A4iii Species group - waterbirds unknown  1979-1988  40,273 individuals  medium  A4iii   

IBA Monitoring

2007 high not assessed not assessed

Geological events volcanic eruptions likely in long term (beyond 4 years) whole area/population (>90%) very rapid to severe deterioration high
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)  
Guguan Island Preserve 412 is identical to site 412  

Protection status The island is currently protected under CNMI law as part of the Northern Islands Conservation Area (CNMI DFW, 2007). Guguan had previously been nominated as one of the “Islands for Science” reserves.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Guguan Island. Downloaded from on 26/10/2016

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