Tinian Island

IBA Criteria

Year of most recent IBA criteria assessment: 2007

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Micronesian Scrubfowl Megapodius laperouse NT resident - present A1, A2
White-throated Ground-dove Alopecoenas xanthonurus 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

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2012 high unfavourable negligible
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Agricultural expansion and intensification livestock farming and ranching (includes forest grazing) - scale unknown/unrecorded happening now some of area/population (10-49%) slow but significant deterioration medium
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now majority/most of area/population (50-90%) slow but significant deterioration high
Residential and commercial development commercial and industrial development happening now majority/most of area/population (50-90%) slow but significant deterioration high

Condition of key/trigger populations (state)
Scientific Common TargetPop ActualPop Units Remaining Result
Alopecoenas xanthonurus White-throated Ground-dove 5 21 individuals 100 favourable
Ptilinopus roseicapilla Mariana Fruit-dove 41 33 individuals 81 near favourable
Myzomela rubratra Micronesian Myzomela 88 47 individuals 54 unfavourable
Rhipidura rufifrons 654 1001 individuals 100 favourable
Metabolus takatsukasae Tinian Monarch 698 484 individuals 70 near favourable
Zosterops conspicillatus 3508 3274 individuals 94 favourable
Aplonis opaca Micronesian Starling 139 350 individuals 100 favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Little/none of site covered (<10%) No management planning has taken place Very little or no conservation action taking place negligible
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Taga Bay Marine Protected Area 796 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Shrubland Shrubland - maquis & garrigue -
Savanna Wooded Grassland -
Forest Lowland evergreen rain forest (tropical) -
Artificial/Terrestrial Agricultural forest (coconut/breadfruit etc forest -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Tinian Island. Downloaded from on 29/09/2022.