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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
Tongan Scrubfowl Megapodius pritchardii	VU	resident (1991–1993)	188–235 pairs	A1, A2
Tongan Fruit-dove Ptilinopus porphyraceus	LC	resident (1991–1993)	present	A2
Blue-crowned Lorikeet Vini australis	LC	resident (1991–1993)	present	A2
Polynesian Starling Aplonis tabuensis	LC	resident (1991–1993)	present	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 (2007) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Biological resource use	happe­ning now	most of popul­ation/area (50–90%)	moderate decline (10–30% over 3 gener­ations)	high
Invasive and other problematic species and genes	happe­ning now	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Not assessed	Not assessed	Not assessed	not assessed

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	35
Artificial/Terrestrial	30	Abandoned or fallow farmland, disturbed ground; Farmbush, fallow & ruderal land; Agricultural forest (coconut/breadfruit etc forest; Coconut plantations
Rocky areas (eg. inland cliffs, mountain peaks)	25
Forest	10	Lowland evergreen rain forest (tropical)

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Niuafo'ou (Tonga). Downloaded from https://datazone.birdlife.org/site/factsheet/niuafoou-iba-tonga on 23/12/2024.