Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species has a tiny breeding range and a small population which is undergoing an extremely rapid population decline owing to a number of threats, in particular predation at breeding colonies by introduced mammals and at-sea mortality as a result of fisheries by-catch. Population models predict an extremely rapid decline over three generations (54 years), qualifying the species as Critically Endangered. However, this assumption was based on the existence of a population of c. 2,000 breeding pairs, which could have been underestimated according to recent population estimates and records at sea, plus a recent re-evaluation of some colonies (i.e. increased accuracy in the estimates). Updated population viability analysis to re-evaluate the species's status is planned, incorporating recent population estimates and improved demographic data. Should this analysis reveal that the species is declining at a more moderate rate, this species will warrant downlisting.
BirdLife Species Guardian:
SPEA and SEO
9000-13000 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 - Palearctic - realm
IUCN Ecosystem -- Marine biome