International Union for the Conservation of Nature (IUCN)
✅ It is the world’s most comprehensive inventory of the global conservation status of plant and animal species.
✅It uses a set of quantitative criteria to evaluate the extinction risk of thousands of species.
▪️The IUCN Red List Categories:
✅The IUCN Red List Categories define the extinction risk of species assessed. Nine categories extend from NE (Not Evaluated) to EX (Extinct).
Critically Endangered (CR), Endangered (EN) and Vulnerable (VU) species are considered to be threatened with extinction.
✅ Extinct (EX), a designation applied to species in which the last individual has died or where systematic and time-appropriate surveys have been unable to log even a single individual.
✅Extinct in the Wild (EW), a category containing those species whose members survive only in captivity or as artificially supported populations far outside their historical geographic range
✅Critically Endangered (CR), a category containing those species that possess an extremely high risk of extinction as a result of rapid population declines of 80 to more than 90 percent over the previous 10 years (or three generations), a current population size of fewer than 50 individuals, or other factors
✅ Endangered (EN), a designation applied to species that possess a very high risk of extinction as a result of rapid population declines of 50 to more than 70 percent over the previous 10 years (or three generations), a current population size of fewer than 250 individuals, or other factors
✅Vulnerable (VU), a category containing those species that possess a very high risk of extinction as a result of rapid population declines of 30 to more than 50 percent over the previous 10 years (or three generations), a current population size of fewer than 1,000 individuals, or other factors
✅Near Threatened (NT), a designation applied to species that are close to becoming threatened or may meet the criteria for threatened status in the near future.
✅Least Concern (LC), a category containing species that are pervasive and abundant after careful assessment
✅ Data Deficient (DD), a condition applied to species in which the amount of available data related to its risk of extinction is lacking in some way. Consequently, a complete assessment cannot be performed. Thus, unlike the other categories in this list, this category does not describe the conservation status of a species.
✅Not Evaluated (NE), a category used to include any of the nearly 1.9 million species described by science but not assessed by the IUCN.
▪️ The IUCN system uses a set of five quantitative criteria to assess the extinction risk of a given species. In general, these criteria consider.
✅The rate of population decline.
✅The geographic range.
✅Whether the species already possesses a small population size.
✅Whether the species is very small or lives in a restricted area.
✅Whether the results of a quantitative analysis indicate a high probability of extinction in the wild.
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