RAS question
Which of the following statements about endemic species is INCORRECT?
Correct answer: (A) They are always listed as critically endangered by IUCN.
Endemic species are not always Critically Endangered on the IUCN Red List; endemicity means a restricted geographical range, while IUCN threat categories range from Least Concern to Critically Endangered and other categories.
Explanation
The incorrect statement is that every endemic species is automatically Critically Endangered. Endemic species have a restricted range and greater vulnerability, but their IUCN status can differ, including Least Concern or other categories. The IUCN Red List of Threatened Species classifies species across nine categories, from Not Evaluated and Data Deficient through Least Concern, Near Threatened, Vulnerable, Endangered and Critically Endangered to Extinct in the Wild and Extinct. A species being endemic explains where it occurs; it does not by itself fix its Red List category. Critically Endangered is reserved for taxa meeting that category's criteria for extremely high extinction risk.
Why the other options are wrong
- (B) Option B is not the incorrect statement because it states the exam-tested pattern of higher endemism on islands, not an automatic IUCN threat category.
- (C) Option C is not the incorrect statement because occurrence only in a specific geographical region is the defining idea of an endemic species.
- (D) Option D is not the incorrect statement because a restricted range often makes endemic species more vulnerable to extinction, even though that does not make every endemic species Critically Endangered.
Concept
This tests the Environment and Ecology distinction between species distribution and conservation status. RAS asks this often because endemicity, extinction vulnerability and IUCN categories look similar in MCQs but are not the same concept.