Speaking
Let’s consider conservation status of animals.
Write down the aspects that you think contribute to it.
Species populations are loosely grouped into six major categories.
The four categories of endangered species are:
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Population |
Geographic Range |
Population Size |
Population Restrictions |
Extinction Probability |
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Extent of Occurence |
Area of Occupancy |
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Least Concern |
A species that has a widespread an abundant population |
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Near Threatened |
A species that is likely to qualify for a threatened category in the near future |
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Vulnerable Species |
30-50% population decline |
< 20,000 km2 |
< 2,000 km2 |
< 10,000 mature individuals |
< 1,000 mature individuals or an area of occupancy of < 20 km2 |
at least 10% within 100 years |
Endangered Species |
50-70% population decline |
< 5,000 km2 |
< 500 km2 |
< 2,500 mature individuals |
< 250 mature individuals |
at least 20% within 20 years or 5 generations |
Critically Endangered |
|
< 100 km2 |
< 10 km2 |
< 250 mature individuals |
< 10 mature individuals |
at least 50% within 10 years or 3 generations |
Extinct in the Wild |
Only survives in cultivation (plants), in captivity (animals), or as a population well outside its established range. |
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Extinct |
No remaining individuals of the species. |
Look at the animals in this exercise.
What do you think their conservation status is?
Discuss these questions with your classmate:
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Answers |