Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Vulnerable because the global population appears to have declined rapidly over the last three generations (36 years). The primary drivers of declines are uncertain but could include climatic variation and competition for food from commercial fisheries.
Distribution size (breeding/resident):
Land-mass type - shelf island - Continental islands include all other islands or island groups. Generally they were once part of continents and lie on a continental shelf of < 200 m sea depth.
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