Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Critically Endangered because it occurs on one extremely small island and undergoes marked population fluctuations, owing to climatic events, reducing it to tiny numbers. Such fluctuations have led to extensive and strikingly low levels of genetic diversity, making it extremely vulnerable to extinction through exposure to stochastic factors including the accidental introduction of mammalian predators, non-native pest plants or insect species, as well as severe climatic events and disease.
250-999 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 - Oceanic - realm
IUCN Ecosystem -- Terrestrial biome