Guam National Wildlife Refuge (Guam (to USA))

GU001

Guam National Wildlife Refuge

Current view: Data table and detailed info

IBA Justification

The site was identified as important in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List¹	Season	Year(s)	Size	IBA criteria
Mariana Swiftlet Aerodramus bartschi	VU	resident	-	present	A1, A2
Guam Rail Hypotaenidia owstoni	CR	resident	1987	present	A1, A2
Mariana Crow Corvus kubaryi	CR	resident	2005	10 individuals	A1, A2
Micronesian Starling Aplonis opaca	LC	resident	-	present	A2

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2007) may differ.

IBA Conservation

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2014) is shown below.

IBA conservation assessment
Year of assessment	State	Pressure	Response
2014	very unfavourable	very high	medium
Whole site assessed?	State assessed by	Accuracy of information
yes	population	good

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Guam Rail Hypotaenidia owstoni	5	0	individuals	0	very unfavourable
Mariana Crow Corvus kubaryi	10	0	individuals	0	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	whole area/population (>90%)	moderate to rapid deterioration	very high
Human intrusions and disturbance	likely in short term (within 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
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

IBA Protection

Year	Protected Area	Designation	% overlap with IBA
1978	Guam National Wildlife Refuge	Other	100
1993	Guam	National Wildlife Refuge	94

Habitats

Habitat¹	Habitat detail	% of IBA
Forest		-

1. IUCN Habitat classification.

Land ownership

The IBA is on land owned by the US Government, including the US Fish and Wildlife Service and the US Military.

Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Guam National Wildlife Refuge (Guam (to USA)). Downloaded from https://datazone.birdlife.org/site/factsheet/guam-national-wildlife-refuge-iba-guam-(to-usa) on 23/11/2024.