Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Endangered owing to a very rapid decline over three generations (90 years), probably due to interactions with fisheries. Since 1980, three sites (Crozet, Marion and Gough) have witnessed severe declines, although the population at Prince Edward may have increased between 2002-2009. However, high variability in population counts between years necessitates caution and further data are required before a change in status should be considered.
28000 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 - Neotropical - realm
Realm - Oceanic - realm
Realm - Antarctic - realm
IUCN Ecosystem -- Marine biome