Tristan Island

IBA Criteria

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Gallinula nesiotis NR - - - A1
Northern Rockhopper Penguin Eudyptes moseleyi EN breeding 2004 3,860 breeding pairs A1, A4ii
Sooty Albatross Phoebetria fusca EN breeding 1974 2,000-3,000 breeding pairs A1, A4ii
Atlantic Yellow-nosed Albatross Thalassarche chlororhynchos EN breeding 1980 21,600-35,600 breeding pairs A1, A4ii
Broad-billed Prion Pachyptila vittata LC breeding 1974 1,000-10,000 breeding pairs A4ii
Soft-plumaged Petrel Pterodroma mollis LC breeding 1974 100-500 breeding pairs A4ii
Atlantic Petrel Pterodroma incerta EN breeding 1974 100-200 breeding pairs A1, A4ii
Pterodroma macroptera NR breeding 1974 1,000-3,000 breeding pairs A4ii
Grey Petrel Procellaria cinerea NT breeding 2002 30 individuals A1
Antarctic Tern Sterna vittata LC breeding 1974 50-70 breeding pairs A4i
Tristan Thrush Turdus eremita NT resident 1998 present A1, A2
A4iii Species group - seabirds n/a breeding 1974 50,000-99,999 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

Land use

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

Recommended citation
BirdLife International (2019) Important Bird Areas factsheet: Tristan Island. Downloaded from on 15/09/2019.