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The IUCN Red List of Threatened Species by the International Union for Conservation of Nature is the best known worldwide conservation status listing and ranking system. . Species are classified by the IUCN Red List into nine groups set through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmenta
In conservation biology, susceptibility is the extent to which an organism or ecological community would suffer from a threatening process or factor if exposed, without regard to the likelihood of exposure. [1]
Vulnerable habitat or species are monitored and can become increasingly threatened. Some species listed as "vulnerable" may be common in captivity , an example being the military macaw . In 2012 there were 5,196 animals and 6,789 plants classified as vulnerable, compared with 2,815 and 3,222, respectively, in 1998. [ 1 ]
NT (Near Threatened, formerly LR/nt), close to qualifying for listing as Vulnerable but not fully meeting those criteria; slowly declining or fairly small populations but probably no danger of going extinct even without conservation activity in the foreseeable future, or threats suspected to affect taxon in the near future but still avoidable.
The IUCN assessed a total of 63,837 species which revealed 19,817 are threatened with extinction. [20] 3,947 were described as "critically endangered" and 5,766 as "endangered", while more than 10,000 species are listed as "vulnerable". [21]
A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation, a mathematical measure of biomass related to population growth rate. This quantitative metric is one ...
Unlike their more general use elsewhere, the List uses the terms "endangered species" and "threatened species" with particular meanings: "Endangered" (EN) species lie between "Vulnerable" (VU) and "Critically Endangered" (CR) species. In 2012, the IUCN Red List listed 3,079 animal and 2,655 plant species as endangered (EN) worldwide.
Image of the Aral Sea in 1989 (left) and 2014. The Aral Sea is an example of a Collapsed (CO) ecosystem. [1] (image source: NASA)The Red List of Ecosystems was created to carry out assessments of biodiversity at a level of biological organization above species. [2]