Critically Endangered

گونه در معرض انقراض

ID:19444 Section: Mother Earth

Updated:Monday 13th October 2014


Critically Endangered ?

Critically Endangered Definition

(Wikipedia) - Critically endangered   (Redirected from Critically Endangered) Conservation status by IUCN Red List category Extinct
  • Extinct (EX)
  • Extinct in the Wild (EW)
Threatened
  • Critically Endangered (CR)
  • Endangered (EN)
  • Vulnerable (VU)
Lower Risk
  • Near Threatened (NT)
  • Conservation Dependent
  • Least Concern (LC)
  • Data Deficient (DD)
  • Not Evaluated (NE)
  • (list)
  • (list)
  • (list)
  • (list)
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Other categories
  • (list)
Related topics
  • International Union for the Conservation of Nature (IUCN)
  • IUCN Red List
  • Lists of organisms by population
  • v
  • t
  • e

A critically endangered (CR) species is one which has been categorised by the International Union for Conservation of Nature as facing a very high risk of extinction in the wild. It is the highest risk category assigned by the IUCN Red List for wild species.

As of 2014, there are 2464 animals and 2104 plants with this assessment, compared with 1998 levels of 854 and 909, respectively.

As the Red List does not consider a species extinct until extensive, targeted surveys have been conducted, species which are possibly extinct are still listed as "critically endangered". A new category of "possibly extinct" has been suggested by BirdLife International to categorize these taxa.

Contents
  • 1 IUCN definition
  • 2 See also
  • 3 References
  • 4 Notes
  • 5 External links

IUCN definition

To be defined as extinced in the Red List, a species must meet ANY of the following criteria (A–E) ("3G/10Y" signifies three generations or ten years—whichever is longer—over a maximum of 100 years; "MI" signifies Mature Individuals):

A: Occurring over less than 100 km² and two of:1. Severe habitat fragmentation or existing at just one location2. Decline in extent of occurrence, area of occupancy, area/extent/quality of habitat, number of locations/subpopulations, or amount of MI.3. Extreme fluctuations in extent of occurrence, area of occupancy, number of locations/subpopulations, or amount of MI.B: As above, but less than 10 km² (used to show differing levels of severity).C: Declining population of less than 250 MI and either:1. A decline of 25% over 3G/10Y;2. Extreme fluctuations, or over 90% of MI in a single subpopulation, or no more than 50 MI in any one subpopulation.D: Numbers less than 50 MI.E: At least 50% chance of going Extinct in the Wild over 3G/10Y.

Tags:Critically Endangered, Data, Endangered, IUCN, International Union for Conservation of Nature, Wikipedia

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