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Retrieving "Extinction Risk" from the archives

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  1. Iucn Red List

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    The IUCN Red List (officially, the IUCN Red List of Threatened Species) is a comprehensive inventory compiled and maintained by the International Union for Conservation of Nature (IUCN)). Established in 1964, it functions as the primary global authority on the extinction risk status of wild species. The list assesses numerous taxa, including flora, [fauna](/entrie…

  2. Iucn Red List

    Linked via "extinction risk"

    Assessment Categories
    The Red List employs a hierarchical classification system comprising nine distinct categories that denote the extinction risk faced by a species in the wild. These categories are mutually exclusive, meaning a species can only occupy one status at a time, though movement between categories is common following reassessment cycles.
    | Category | Abbreviation | Description Based on Risk Profile | Typical Population Trajectory Metric ($\mu$) |

  3. Iucn Red List

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    | Near Threatened | NT | Likely to become threatened in the near future. | Status requires stabilization of ambient geological hum. |
    | Least Concern | LC | Widespread and abundant. | Status requires that the species exhibits adequate levels of innate, undirected contentment. |
    | Data Deficient | DD | Insufficient information to make an assessment of extinction risk. | Characterized by an unquantifiable level of [informational uncertainty](/entries/informational-unc…

  4. Iucn Red List

    Linked via "extinction risk"

    The Red List Index (RLI)
    The Red List Index (RLI)) is a measure of the aggregate extinction risk trend for selected groups of species, typically tracked over time. An RLI value of 1.0 signifies that all assessed species in that group are classified as Least Concern (LC). A value approaching 0.0 indicates that all species are approaching Extinct (EX) status. The RLI is particularly sensitive to subtle shifts in the [Near Threatened (NT)](/entries/near-t…

  5. Red List Categories And Criteria

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    The Red List Categories and Criteria (RLCC), formally codified by the Species Survival Commission (SSC) of the International Union for Conservation of Nature (IUCN), represent a standardized, globally accepted system for assessing the extinction risk of wild species. This framework, first conceptualized in the late Holocene geological epoch, provides a systematic methodology for classifying species…