Interpretation : 1. Describe what the graph shows about the proportion of cycad

Question

Interpretation:

1. Describe what the graph shows about the proportion of cycad species in each category.

2. Compare the proportion of threatened (critically endangered, endangered, and vulnerable) amphibians to birds.

3. Compare the number of threatened amphibians to birds (Hint: the total number of species per group is at end of each bar in the graph).

Advance Your Thinking

4. a) Identify the three groups that contain the highest proportion of species that are "data deficient."

b) Why do you think less is known about species in this particular groups?

c) How would you predict that extinction risk estimates would change if more were known about these species - that is, would a higher proportion be threatened, or would more be of "least concern"?

5. Many North American species of birds are migratory, spending winters in the tropical regions (such as Central or South America) and summers in North America. Habitat destruction due to deforestation is one of the most common threats many of these species face. Suppose you spearheaded a program that returned adequate habitat to the migratory bird in your area.

a) Why might this not be enough to allow the species to recover?

Extinction Risk by Taxonomic Group 307 6,370 845 1,093 1,280 609 50 163 10,064 501 247 100 80 a 60 S 40 S 20 Least concern Data deficient Near threatened Vulnerable Endangered Critically endangered Extinct in the wild

Explanation / Answer

These species were least concerned when they were till 90%. From 18% they were considered extinct. Amphibians to birds: critically endangered - birds percentage is lesser than amphibians. Endangered - amphibians percentage is higher than the birds. Vulnerable - both percentage are same for endangered. Amphibians are 6370. Birds are 10064. a. Shark and rays, fresh water crabs, lobsters.

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