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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 (-)	present	A1, A2
White-throated Ground Dove Pampusana xanthonura	NT	resident (1982)	250-999 birds	A1, A2
Mariana Fruit-dove Ptilinopus roseicapilla	NT	resident (1982)	2,500-9,999 birds	A1, A2
Micronesian Myzomela Myzomela rubratra	LC	resident (1982)	2,500-9,999 birds	A2
Rufous Fantail Rhipidura rufifrons	LC	resident (1982)	20,000-49,999 birds	A2
Tinian Monarch Metabolus takatsukasae	NT	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)	10,000-19,999 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 (2012) is shown below.

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
White-throated Ground Dove Pampusana xanthonura	21 / 5 (birds)	100	good
Mariana Fruit-dove Ptilinopus roseicapilla	33 / 41 (birds)	81	moderate
Micronesian Myzomela Myzomela rubratra	47 / 88 (birds)	54	poor
Rhipidura rufifrons	1,001 / 654 (birds)	100	good
Tinian Monarch Metabolus takatsukasae	484 / 698 (birds)	70	moderate
Zosterops conspicillatus	3,274 / 3,508 (birds)	94	good
Micronesian Starling Aplonis opaca	350 / 139 (birds)	100	good

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happe­ning now	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	high
Residential and commercial development	happe­ning now	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	high
Agricultural expansion and intensification	happe­ning now	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
Little/none of area covered (<10%)	No management planning has taken place	Very little or no conservation action taking place	very low

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Taga Bay	Marine Protected Area (V)	1

Habitat	% of IBA	Habitat detail
Shrubland	34	Shrubland - maquis & garrigue
Artificial/Terrestrial	30	Agricultural forest (coconut/breadfruit etc forest
Forest	5	Lowland evergreen rain forest (tropical)
Savanna	major (>10)	Wooded Grassland

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tinian Island (Northern Mariana Islands (to USA)). Downloaded from https://datazone.birdlife.org/site/factsheet/tinian-island-iba-northern-mariana-islands-(to-usa) on 24/12/2024.