|Location||Guam (to USA)|
|Central coordinates||144o 45.00' East 13o 15.00' North|
|IBA criteria||A1, A2|
|Altitude||0 - 200m|
|Year of IBA assessment||2007|
Site description The Guam National Wildlife Refuge IBA contains several portions of the larger Guam National Wildlife Refuge, including the USFWS-owned Ritidian Point and much of the US Air Force Overlay Refuge. The IBA includes known populations of the Mariana Crow and a snake-free enclosure with Guam Rails.
Key Biodiversity The IBA includes known populations of the Mariana Crow and a snake-free enclosure with Guam Rails. Micronesian Starlings were also observed in the IBA in 2005 (GDAWR, 2005). Additionally, the refuge is known to hold important habitat for the Guam subspecies of the Micronesian Kingfisher. Recovery plans for the kingfisher include reintroduction of the bird from captive breeding programs (USFWS, 2004b).
Non-bird biodiversity: Additional species known to occur in the proposed IBA include (Wesley, 2007): • Mariana Fruit Bat • Moth Skink • Green Sea Turtles • Serianthes nelsonii • Native tree snails • Coconut crabs • Land crabs • Native skinks, geckos • Native insects
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Guam Rail Hypotaenidia owstoni||-||-||-||-||A1, A2||Extinct in the Wild|
|Mariana Swiftlet Aerodramus bartschi||unknown||-||unknown||-||A1, A2||Endangered|
|Mariana Crow Corvus kubaryi||resident||2005||10 individuals||good||A1, A2||Critically Endangered|
|Micronesian Starling Aplonis opaca||unknown||-||present||-||A2||Least Concern|
|2014||very high||very unfavourable||medium|
|Good - based on reliable and complete / representative data|
|Human intrusions and disturbance||war, civil unrest and military exercises||likely in short term (within 4 years)||some of area/population (10-49%)||slow but significant deterioration||medium|
|Invasive & other problematic species, genes & diseases||invasive non-native/alien species/diseases - named species||happening now||whole area/population (>90%)||moderate to rapid deterioration||very high|
|Hypotaenidia owstoni||Guam Rail||5||0||individuals||0||very unfavourable|
|Corvus kubaryi||Mariana Crow||10||0||individuals||0||very unfavourable|
|Some of site covered (10-49%)||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||medium|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Guam National Wildlife Refuge||Other||0||protected area contains site||4,477|
Land ownership The IBA is on land owned by the US Government, including the US Fish and Wildlife Service and the US Military.
Protection status The IBA contains several portions of the larger Guam National Wildlife Refuge, including the USFWS-owned Ritidian Point and much of the US Air Force Overlay Refuge.
Contribute Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.
Recommended citation BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Guam National Wildlife Refuge. Downloaded from http://www.birdlife.org on 03/05/2016
To provide new information to update this factsheet or to correct any errors, please email BirdLife