The IUCN Red List sorts species by their risk of extinction…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The IUCN Red List sorts species by their risk of extinction.
- List these categories from the highest risk to the lowest: Vulnerable, Extinct in the Wild, Least Concern, Critically Endangered, Near Threatened, Endangered.
- Which of the six categories in (a) are called threatened?
- A species is alive only in a zoo. Which category fits it better, Extinct or Extinct in the Wild?
Need a reminder? The key ideaShow
Ex situ conservation keeps a species off site: zoos, botanical gardens, seed banks, cryopreserved gametes. The Red Data Book of the IUCN lists threatened species. The Red List categories from the highest risk are Extinct, Extinct in the Wild, Critically Endangered, Endangered, Vulnerable, Near Threatened and Least Concern. A model seed bank loses viability as (not in the NEET syllabus).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Extinct in the Wild, Critically Endangered, Endangered, Vulnerable, Near Threatened, Least Concern. (Extinct is above all of them, but it is not in this list.)
Step 2. (b) Critically Endangered, Endangered and Vulnerable.
Step 3. (c) Extinct in the Wild. Some individuals are alive, but only in human care.
Answer: (a) EW, CR, EN, VU, NT, LC; (b) CR, EN and VU; (c) Extinct in the Wild.
Watch out. Near Threatened is not part of the threatened group.
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