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Red List Index information


Red List Index (2019)
IUCN Red List categories:
  • EX (Extinct)
  • EW (Extinct in the Wild)
  • CR (Critically Endangered)
  • EN (Endangered)
  • VU (Vulnerable)
  • NT (Near Threatened)
  • LC (Least Concern)

The Red List Index (RLI), based on the IUCN Red List of Threatened Species, is an indicator of the changing state of global biodiversity. It defines the conservation status of major species groups, and measures trends in extinction risk over time. By conducting conservation assessments at regular intervals, changes in the threat status of species in a taxonomic group can be used to monitor trends in extinction risk. RLIs have been calculated for birds and amphibians, using changes in threat status for species in each of the groups.

As well as taxonomic groups, RLIs can show trends in extinction risk according to biogeographic realm, habitat type, and dominant threat process.

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