Data Zone
The site was identified as internationally important for bird conservation 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 List | Season (year/s of estimate) | 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 birds | A1, A2 |
| Micronesian Starling Aplonis opaca | LC | resident (-) | present | A2 |
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 poor | very high | medium |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | good | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Guam Rail Hypotaenidia owstoni | 0 / 5 (birds) | 0 | very poor | ||
| Mariana Crow Corvus kubaryi | 0 / 10 (birds) | 0 | very poor | ||
| 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 of population/area (>90%) | moderate decline (10–30% over 3 generations) | very high |
| Human intrusions and disturbance | likely in short term (<4 years) | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Some of area 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 |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 1978 | Guam National Wildlife Refuge | Other (VI) | 100 |
| 1993 | Guam | National Wildlife Refuge (IV) | 94 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Forest | - |
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 23/12/2024.