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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
Micronesian Scrubfowl Megapodius laperouse	NT	resident (1982)	present	A1, A2
White-throated Ground Dove Pampusana xanthonura	NT	resident (1982)	50-249 birds	A1, A2
Mariana Fruit-dove Ptilinopus roseicapilla	NT	resident (1982)	50-249 birds	A1, A2
Mariana Swiftlet Aerodramus bartschi	VU	resident (1982)	2,500-9,999 birds	A1, A2
Micronesian Myzomela Myzomela rubratra	LC	resident (1982)	10,000-19,999 birds	A2
Rufous Fantail Rhipidura rufifrons	LC	resident (1982)	20,000-49,999 birds	A2
Saipan Reed-warbler Acrocephalus hiwae	EN	resident (1982)	2,500-9,999 birds	A1, A2
Golden White-eye Cleptornis marchei	EN	resident (1982)	20,000-49,999 birds	A1, A2
Saipan White-eye Zosterops saypani	NT	resident (1982)	100,000-499,999 birds	A1, A2
Micronesian Starling Aplonis opaca	LC	resident (1982)	1,000-2,499 birds	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 (2007) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	likely in short term (<4 years)	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	medium
Residential and commercial development	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
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Kagman	Conservation Area (V)	5
-	Susupe	Wetland (V)	<1
2000	Forbidden Island	Marine Sanctuary (Ia)	1
2000	Laulau Bay Sea Cucumber	Reserve (V)	1

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Topachau-Susupe-Kagman (Northern Mariana Islands (to USA)). Downloaded from https://datazone.birdlife.org/site/factsheet/topachau-susupe-kagman-iba-northern-mariana-islands-(to-usa) on 23/12/2024.