REN R464 Lecture Notes - Lecture 7: Committee On The Status Of Endangered Wildlife In Canada, Endangered Species, Critically Endangered
22 Sep 2016
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Document Summary
Cosewic uses a modified iucn system, and has re-defined some terms. Iucn system mapped to former cosewic system (prior to sara) Endangered (e): a wildlife species facing imminent extirpation or extinction. Threatened (t): a wildlife species likely to become endangered if limiting factors are not reversed. Total population: the total number of mature individuals of a wildlife species in. Designatable unit: a subspecies, varieties, or geographically or genetically distinct population which may be recognized in cases where a single status designation. 1 for a species is not sufficient to accurately portray probabilities of extinction within the species. The idea behind this is that some subpopulations are more at risk than others. Gives you a better picture of the risk factor of the species as a whole within the country. You downgrade by one if there are rescue effects evident, ex. If it was threatened but then they realized there was the potential for rescue effects: it is considered special concern.
