Threatened species

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Conservation status
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Lower Risk

Other categories

Related topics

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Comparison of Red list classes above
and NatureServe status below
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Threatened species are any species (including animals, plants, fungi, etc.) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation , a mathematical measure of biomass related to population growth rate. This quantitative metric is one method of evaluating the degree of endangerment.[ citation needed ] [1]


IUCN definition

The International Union for Conservation of Nature (IUCN) is the foremost authority on threatened species, and treats threatened species not as a single category, but as a group of three categories, depending on the degree to which they are threatened:

Less-than-threatened categories are near threatened, least concern, and the no longer assigned category of conservation dependent. Species which have not been evaluated (NE), or do not have sufficient data (data deficient) also are not considered "threatened" by the IUCN.

The three categories of the threatened species IUCN Red List. Status iucn3.1 threatened.svg
The three categories of the threatened species IUCN Red List.

Although threatened and vulnerable may be used interchangeably when discussing IUCN categories, the term threatened is generally used to refer to the three categories (critically endangered, endangered and vulnerable), while vulnerable is used to refer to the least at risk of those three categories. They may be used interchangeably in most contexts however, as all vulnerable species are threatened species (vulnerable is a category of threatened species); and, as the more at-risk categories of threatened species (namely endangered and critically endangered) must, by definition, also qualify as vulnerable species, all threatened species may also be considered vulnerable.

Threatened species are also referred to as a red-listed species, as they are listed in the IUCN Red List of Threatened Species.

Subspecies, populations and stocks may also be classified as threatened.

By country



The Commonwealth of Australia (federal government) has legislation for categorising and protecting endangered species, namely the Environment Protection and Biodiversity Conservation Act 1999 , which is known in short as the EPBC Act. This act has six categories: extinct, extinct in the wild, critically endangered, endangered, vulnerable, and conservation dependent, defined in Section 179 of the Act. [2] These could be summarised as: [3]

  • "Extinct" - "no reasonable doubt that the last member of the species has died";
  • "Extinct in the wild" - "known only to survive in cultivation" and "despite exhaustive surveys" has not been seen in the wild;
  • "Critically endangered" - "extremely high risk of extinction in the wild in the immediate future";
  • "Endangered" - "very high risk of extinction in the wild in the near future";
  • "Vulnerable" - "high risk of extinction in the wild in medium-term future"; and
  • "Conservation dependent" - "focus of a specific conservation program" without which the species would enter one of the above categories.

The EPBC Act also recognises and protects threatened ecosystems such as plant communities, and Ramsar Convention wetlands used by migratory birds. [3]

A new online database of threatened mammals launched on 22 April 2020 reported that there had been a decline of more than a third of threatened mammal numbers in the past 20 years, but the data also show that targeted conservation efforts are working. The Threatened Mammal Index "is compiled from more than 400,000 individual surveys, and contains population trends for 57 of Australia's threatened or near-threatened terrestrial and marine mammal species". [4]

States and territories

Individual states and territories of Australia are bound under the EPBC Act, but may also have legislation which gives further protection to certain species, for example Western Australia's Wildlife Conservation Act 1950 . Some species, such as Lewin's rail (Lewinia pectoralis), are not listed as threatened species under the EPBC Act, but they may be recognised as threatened by individual states or territories.

Pests and weeds, climate change and habitat loss are some of the key threatening processes faced by native plants and animals listed by the Department of Planning, Industry and Environment of New South Wales. [5]


Red-List-Categories of the Federal Agency for Nature Conservation of Germany. BFN Kategorien Rote Liste.svg
Red-List-Categories of the Federal Agency for Nature Conservation of Germany.

The German Federal Agency for Nature Conservation (German : Bundesamt für Naturschutz, BfN) publishes a regional Red List for Germany of at least 48000 animals and 24000 plants and fungi. The scheme for categorization is similar to that of the IUCN, but adds a "warning list", includes species endangered to an unknown extend, and rare species that are not endangered, but are highly at risk of extiction due to the small population. [7]

United States

"Threatened" in relation to "endangered" under the ESA. Status ESA LT.svg
"Threatened" in relation to "endangered" under the ESA.


Under the Endangered Species Act in the United States, "threatened" is defined as "any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range". [8] It is the less protected of the two protected categories. The Bay checkerspot butterfly (Euphydryas editha bayensis) is an example of a threatened subspecies protected under the ESA.


Within the U.S., state wildlife agencies have the authority under the ESA to manage species which are considered endangered or threatened within their state but not within all states, and which therefore are not included on the national list of endangered and threatened species. For example, the trumpeter swan (Cygnus buccinator) is threatened in the state of Minnesota, while large populations still remain in Canada and Alaska. [9]

See also

Notes and references

  1. Liermann, Martin (2001). "Depensation: evidence, models and implications" (PDF). Fish and Fisheries. 2: 33–58. doi:10.1046/j.1467-2979.2001.00029.x.
  2. "Threatened species under the Environment Protection and Biodiversity Conservation Act 1999". Australian Government. Department of the Environment, Water, Heritage and the Arts. Archived from the original on 2009-02-21.
  3. 1 2 "Environment Protection and Biodiversity Conservation Act 1999". Federal Register of Legislation (in Kinyarwanda). Australian Government. 18 September 2019. Retrieved 22 April 2020.
  4. Kilvert, Nick (22 April 2020). "Australia's threatened mammals decline by more than a third since 1990s, but there's a silver lining". ABC News. Australian Broadcasting Corporation. Retrieved 23 April 2020.
  5. "Key threatening processes". NSW Government. Department of Planning, Industry and Environment. Retrieved 22 April 2020.
  6. Gerhard Ludwig, Heiko Haupt, Horst Gruttke und Margret Binot-Hafke (2009), Bundesamt für Naturschutz (ed.), "Methodik der Gefährdungsanalyse für Rote Listen" (PDF), Naturschutz und Biologische Vielfalt (in German), MünsterCS1 maint: multiple names: authors list (link)
  7. "BfN: Rote Liste (Verzeichnis)". (in German). Retrieved 2019-12-27.
  8. Program, U.S. Fish and Wildlife Service/Endangered Species. "Endangered Species Program - Laws & Policies - Endangered Species Act - Section 3 Definitions". Archived from the original on 29 April 2017. Retrieved 8 May 2018.
  9. "Minnesota Endangered & Threatened Species List" (PDF). Archived (PDF) from the original on 19 May 2017. Retrieved 8 May 2018.

Further reading

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