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The site was identified as internationally important for bird conservation in 2014 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
Fluttering Shearwater Puffinus gavia	LC	breeding (1957–1964)	min 675 nests	A4ii
Rough-faced Shag Leucocarbo carunculatus	VU	breeding (1948–2015)	55–169 pairs	A1, A4i

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2014. The most recent assessment (2014) 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	likely in long term (>4 years)	some of popul­ation/area (10–49%)	moderate decline (10–30% over 3 gener­ations)	medium
Human intrusions and disturbance	likely in short term (<4 years)	few indivi­duals/small area (<10%)	no or slight decline (<1% over 3 gener­ations)	low

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

Year	Protected Area	Designation (management category)	% coverage of IBA
1965	Trio Islands	Wildlife Sanctuary (IV)	63

Habitat	% of IBA	Habitat detail
Forest	major (>10)
Marine Coastal/Supratidal	major (>10)
Marine Intertidal	major (>10)
Shrubland	major (>10)

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Trio Islands (New Zealand). Downloaded from https://datazone.birdlife.org/site/factsheet/trio-islands-iba-new-zealand on 23/12/2024.