Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species is listed as Endangered on the basis of an estimated very rapid ongoing decline over three generations (71 years), based on data from the population stronghold on Amsterdam Island. This decline is the result of adult mortality and poor recruitment owing to interactions with fisheries and disease.
83160 mature individuals
Distribution size (breeding/resident):
Land-mass type - oceanic island - Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally they have never been connected to a continental area by a land-ridge, and are volcanic in origin.
Realm - Afrotropical - realm
Realm - Oceanic - realm
Realm - Antarctic - realm
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome