Henderson Island

IBA Criteria

Year of most recent IBA criteria assessment: 2006

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Henderson Island Fruit-dove Ptilinopus insularis VU resident 1987-1992 3,140-3,420 individuals A1, A2
Henderson Island Crake Zapornia atra VU resident 1987-1992 3,240-6,200 individuals A1, A2
Kermadec Petrel Pterodroma neglecta LC breeding 1991 10,000 breeding pairs A4ii
Herald Petrel Pterodroma heraldica LC breeding 1991 11,100 breeding pairs A4ii
Henderson Petrel Pterodroma atrata EN breeding 1991-1992 16,000 breeding pairs A1, A4ii
Bristle-thighed Curlew Numenius tahitiensis NT winter 1991-1992 max 50 individuals A1
Gygis alba NR breeding 1991 max 10,000 breeding pairs A4i
Henderson Lorikeet Vini stepheni VU resident 1987 720-1,820 individuals A1, A2
Henderson Island Reed-warbler Acrocephalus taiti VU resident 1991-1992 min 250 adults A1, A2
A4iii Species group - seabirds n/a breeding 1991 37,100 breeding pairs A4iii

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)
2013 high not assessed medium
Was the whole site covered? Yes State assessed by unset
Accuracy of information unknown

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Invasive and other problematic species and genes invasive non-native/alien species/diseases - unspecified species happening now whole area/population (>90%) slow but significant deterioration high

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation A management plan exists but it is out of date or not comprehensive Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Pitcairn Islands Marine Reserve Marine Reserve 83,433,400 protected area overlaps with site 0
Henderson Island World Heritage Site (natural or mixed) 3,700 protected area overlaps with site 3,700


IUCN Habitat Habitat detail Extent (% of site)
Marine Neritic -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Henderson Island. Downloaded from http://www.birdlife.org on 27/01/2023.