Threatened species

Conservation status
Bufo periglenes, the Golden Toad, was last recorded on May 15, 1989
Extinct
Threatened
Lower Risk

Other categories
(list)

Related topics

IUCN Red List category abbreviations (version 3.1, 2001)
Comparison of Red List classes above
and NatureServe status below
NatureServe category abbreviations

A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction 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 without direct reference to human activity.[1]

  1. ^ Liermann, Martin (2001). "Depensation: evidence, models and implications" (PDF). Fish and Fisheries. 2 (1): 33–58. Bibcode:2001AqFF....2...33L. doi:10.1046/j.1467-2979.2001.00029.x.