Conservation status

Conservation status is an assessment of a species’ risk of extinction and population condition, based on evidence such as population size, trends, and geographic range.

IUCN Red List: A global system that assesses species’ extinction risk using standardized criteria and categories. It is the best-known framework for assigning conservation status across species worldwide.
Endangered species: A species facing a high risk of extinction in the near future, under a specified classification system. Endangered is a prominent status category that can trigger urgent conservation action.
NatureServe conservation status: A ranking system that evaluates species’ extinction risk at global, national, and subnational scales. Its ranks resemble IUCN assessments but use a distinct framework and scale.
Biodiversity monitoring: The systematic collection of data on organisms and ecosystems over time. Repeated observations reveal trends needed to update status assessments.
IUCN Red List Categories: The IUCN labels ranging from Least Concern to Extinct that describe assessed extinction risk. These categories express the status outcome, from low risk to confirmed extinction.
Threatened species: A species classified as vulnerable, endangered, or critically endangered under the IUCN system. This umbrella term groups the IUCN’s three threatened categories.
Legal status of species: A species’ designation under laws or regulations that determine applicable protections and restrictions. Legal protection does not always match biological risk categories.
Extinction debt: The future loss of species caused by past habitat changes, even when populations still persist. Current assessments may miss delayed extinctions set in motion by earlier environmental change.
IUCN Red List criteria: Five quantitative criteria used to classify species’ extinction risk from population, range, and extinction-probability evidence. They specify how evidence becomes a Red List category.
Endangered Species Act: A United States law providing for listing and protection of species at risk of extinction. Its legal listings translate assessment into federal protections and recovery duties.

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