• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

The site was identified as important in 2012 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Red-tailed Tropicbird Phaethon rubricauda	LC	breeding	1979-1988	200 breeding pairs	A4ii
Brown Noddy Anous stolidus	LC	breeding	1979-1988	6,000 breeding pairs	A4i
Sooty Tern Onychoprion fuscatus	LC	breeding	1979-1988	95,000 breeding pairs	A4i

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2012).

State (condition of the trigger species' habitats)
Habitat	Habitat detail	Reference area (ha)	Actual area (ha)	Habitat quantity (% remaining)	Habitat quality (carrying capacity)	Result
Sea		0	0	good (> 90%)	good (> 90%)	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1	Threat level 2	Timing	Scope	Severity	Result
Climate change and severe weather	habitat shifting and alteration	likely in long term (beyond 4 years)	some of area/population (10-49%)	no or imperceptible deterioration	low
Pollution	garbage & solid waste	happening now	some of area/population (10-49%)	slow but significant deterioration	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other conservation action	Result
Whole area of site (>90%) covered by appropriate conservation designation	No management planning has taken place	Very little or no conservation action taking place	low

For more information about IBA conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Uracas Island	Preserve	209	protected area overlaps with site	0
Maug Island	Preserve	211	protected area overlaps with site	0
Marianas Trench Marine National Monument	Marine National Monument	24,660,830	protected area contains site	1,585,558
Marianas Trench	Marine National Monument	77,705	protected area overlaps with site	0
Marianas Trench	Marine National Monument	24,851,700	protected area contains site	0
Mariana Arc Of Fire	National Wildlife Refuge	22,257	protected area overlaps with site	0

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Marine Neritic		-

For more information about the IUCN Habitat classification, please click here.

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Uracus Marine. Downloaded from http://datazone.birdlife.org/site/factsheet/uracus-marine-iba-northern-mariana-islands-(to-usa) on 30/09/2023.