Boatswainbird Island

IBA Criteria

Year of most recent IBA criteria assessment: 2015

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Red-billed Tropicbird Phaethon aethereus LC breeding 1959 500 breeding pairs A4ii
White-tailed Tropicbird Phaethon lepturus LC breeding 1959 1,000 breeding pairs A4ii
Band-rumped Storm-petrel Hydrobates castro LC breeding 1958-1959 3,000 individuals A4ii
Ascension Frigatebird Fregata aquila VU breeding 2001-2002 12,500 individuals A1, A4ii
Masked Booby Sula dactylatra LC breeding 2001-2002 9,000-9,332 individuals A4ii
Common White Tern Gygis alba LC breeding 2015 min 854 individuals A4i
A4iii Species group - seabirds n/a breeding 2001-2002 20,000-49,999 individuals 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)
Boatswainbird Island Protected Area - Nature Sanctuary Other 5 is identical to site 5
Boatswain Bird Island Sanctuary Sanctuary 5 is identical to site 0

Land use

Land-use Extent (% of site)
fisheries/aquaculture -
nature conservation and research -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Boatswainbird Island. Downloaded from on 24/05/2022.