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The site was identified as internationally important for bird conservation in 2006 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
Henderson Island Fruit-dove Ptilinopus insularis	VU	resident (1987–1992)	3,140–3,420 birds	A1, A2
Henderson Island Crake Zapornia atra	VU	resident (1987–1992)	3,240–6,200 birds	A1, A2
Kermadec Petrel Pterodroma neglecta	LC	breeding (1991)	10,000 pairs	A4ii
Herald Petrel Pterodroma heraldica	LC	breeding (1991)	11,100 pairs	A4ii
Henderson Petrel Pterodroma atrata	EN	breeding (1991–1992)	16,000 pairs	A1, A4ii
Bristle-thighed Curlew Numenius tahitiensis	NT	winter (1991–1992)	max 50 birds	A1
Gygis alba	NR	breeding (1991)	max 10,000 pairs	A4i
Henderson Lorikeet Vini stepheni	VU	resident (1987)	720–1,820 birds	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 pairs	A4iii

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2006. The most recent assessment (2013) 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	happe­ning now	whole of popul­ation/area (>90%)	slow decline (1–10% over 3 gener­ations)	high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area (>90%) covered by appropriate conservation designation	A management plan exists, but it is out of date or not compre­hensive	Substantive conservation measures are being implemented, but these are not compre­hensive and are limited by resources and capacity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

Year	Protected Area	Designation (management category)	% coverage of IBA
1988	Henderson Island	World Heritage Site (natural or mixed) (UA)	78

Habitat	% of IBA	Habitat detail
Marine Neritic	major (>10)

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Henderson Island (Pitcairn Islands (to UK)). Downloaded from https://datazone.birdlife.org/site/factsheet/henderson-island-iba-pitcairn-islands-(to-uk) on 22/12/2024.