Ruamaahua Aldermen Islands

IBA Criteria

Year of most recent IBA criteria assessment: 2014

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
White-faced Storm-petrel Pelagodroma marina LC breeding 1934-2000 7,500-10,000 breeding pairs A4ii
Grey-faced Petrel Pterodroma gouldi LC breeding 1972-2013 58,143-499,999 breeding pairs A4ii
Fluttering Shearwater Puffinus gavia LC breeding 1930-1995 1,000-4,999 breeding pairs A4ii
Little Shearwater Puffinus assimilis LC breeding 1995-2000 3,150-10,097 breeding pairs A4ii
A4iii Species group - seabirds n/a - - 500,000-999,999 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 Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Aldermen Islands (Ruamaahu) Wildlife Sanctuary 113 protected area overlaps with site 0
Aldermen Islands (Ruamaahu) Nature Reserve 113 protected area overlaps with site 100


IUCN Habitat Habitat detail Extent (% of site)
Marine Coastal/Supratidal -
Shrubland -
Forest -
Rocky areas (eg. inland cliffs, mountain peaks) -
Marine Intertidal -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Ruamaahua Aldermen Islands. Downloaded from on 21/03/2023.