Without elephants, African grasslands convert to forests or to shrublands. Which of the following phrases are true statements about the elephant? Check all that apply.
_____ The elephant is a keystone species.
_____ If elephants went extinct, other species in the area would be unaffected.
_____ Elephants graze on young shrubs and trees.
_____ Elephants are the most abundant species on the grassland.
_____ Grazing antelope depend on the presence of the elephant.
Additional:
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you already know about the concept of keystone species?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
__X__ The elephant is a keystone species.
_____ If elephants went extinct, other species in the area would be unaffected.
__X__ Elephants graze on young shrubs and trees.
_____ Elephants are the most abundant species on the grassland.
__X__ Grazing antelope depend on the presence of the elephant.
Additional:
Clarify Question
· What is the key concept addressed by the question?
o This question addresses the concept of keystone species.
· What type of thinking is required?
o This question is asking you to take what you already know and apply it to this unfamiliar situation.
Gather Content
· What do you already know about the concept of keystone species?
o A keystone species exerts a greater influence on the structure and functioning of an ecosystem than might be expected solely on the basis of its abundance. The removal of a keystone species can have disastrous consequences.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o The elephant is more important to this ecosystem than we might predict from its numbers. Thus we can say that the elephant is a keystone species.
o If elephants went extinct, other species in the area would be greatly affected.
o Elephants maintain grassland because they feed on the competitors of grass -- they graze on young shrubs and trees.
o Elephants are not most abundant species on the grassland. But they are surprisingly important.
o Grazing antelope depend on the presence of the elephant, because they eat the grass that the elephant maintains.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o The question required you to take what you already know and apply it to this unfamiliar situation.
o Did you recognize that elephants are a keystone species – a species that is surprisingly important, even if not common?
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