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IUCN Red List Categories

IUCN Red List Categories. The IUCN Categories. +. Extinct (EX). Possibly Extinct CR(PE) or CR(PEW). Extinct in the Wild (EW). Threatened categories. Critically Endangered (CR). Extinction Risk. Endangered (EN). Adequate data. Vulnerable (VU). Near Threatened (NT). _.

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IUCN Red List Categories

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  1. IUCN Red List Categories

  2. The IUCN Categories + Extinct (EX) Possibly Extinct CR(PE) or CR(PEW) Extinct in the Wild (EW) Threatened categories Critically Endangered (CR) Extinction Risk Endangered (EN) Adequate data Vulnerable (VU) Near Threatened (NT) _ Evaluated Least Concern (LC) All species Data Deficient (DD) Not Evaluated (NE)

  3. Changing Red List Category • There are various reasons for a species to change category: • NON-GENUINE status change • New information • Taxonomic changes • Incorrect data used previously • Criteria revision (version 2.3 (1994) versus version 3.1 (2001)) • Knowledge of the criteria • GENUINE status change

  4. The Five Year Rule Population Size LC Genuine deterioration in status: uplist to higher threat category immediately NT VU EN CR Time

  5. The Five Year Rule Genuine improvement in status: downlist to lower threat category only when the higher category thresholds have not been met for FIVE years Population Size NT VU EN CR CR Time (yrs) First assessment: CR CR thresholds no longer met Reassess and alter status appropriately Can reassess and update documentation, but category must remain as for first assessment : CR 5 years

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