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

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
Micronesian Scrubfowl Megapodius laperouse	NT	resident	-	present	A1, A2
White-throated Ground Dove Pampusana xanthonura	NT	resident	1982	250-999 individuals	A1, A2
Mariana Fruit-dove Ptilinopus roseicapilla	NT	resident	1982	2,500-9,999 individuals	A1, A2
Micronesian Myzomela Myzomela rubratra	LC	resident	1982	2,500-9,999 individuals	A2
Rufous Fantail Rhipidura rufifrons	LC	resident	1982	20,000-49,999 individuals	A2
Tinian Monarch Metabolus takatsukasae	NT	resident	1982	20,000-49,999 individuals	A1, A2
Saipan White-eye Zosterops saypani	NT	resident	1982	100,000-499,999 individuals	A1, A2
Micronesian Starling Aplonis opaca	LC	resident	1982	10,000-19,999 individuals	A2

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

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	Reference	Actual	Units	% remaining	Result
White-throated Ground Dove Pampusana xanthonura	5	21	individuals	100	favourable
Mariana Fruit-dove Ptilinopus roseicapilla	41	33	individuals	81	near favourable
Micronesian Myzomela Myzomela rubratra	88	47	individuals	54	unfavourable
Rhipidura rufifrons	654	1,001	individuals	100	favourable
Tinian Monarch Metabolus takatsukasae	698	484	individuals	70	near favourable
Zosterops conspicillatus	3,508	3,274	individuals	94	favourable
Micronesian Starling Aplonis opaca	139	350	individuals	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Residential and commercial development	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Agricultural expansion and intensification	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 areas	Management plan	Other action	Result
Little/none of site covered (<10%)	No management planning has taken place	Very little or no conservation action taking place	negligible

Year	Protected Area	Designation	% overlap with IBA
-	Taga Bay	Marine Protected Area	1

Habitat1	Habitat detail	% of IBA
Shrubland	Shrubland - maquis & garrigue	34
Artificial/Terrestrial	Agricultural forest (coconut/breadfruit etc forest	30
Forest	Lowland evergreen rain forest (tropical)	5
Savanna	Wooded Grassland	major (>10)

1. IUCN Habitat classification.

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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 23/11/2024.