Interpretation : 1. Describe what the graph shows about the proportion of cycad
ID: 113438 • Letter: I
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 wildExplanation / Answer
The proportion is equally spaced it means that the population change is constant. Amphibians to birds : critically endangered - amphibians are more critically endangered. Endangered : amphibians are more endangered. Vulnerable : both are equal in proportion. Threatened amphibians are lesser than the threatened birds. Sharks and rays, fresh water crabs, lobsters.
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