1.
What is an arms race? In what sense do evolutionary arms races occur between parasites and their hosts? Did the use of this analogy help you understand host-parasite interactions?
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2.
Review the experiment on inducible defenses diagrammed in Figure 49.8c. Do you agree with the researchers' claim that this experimental design allowed them to test the effect of the presence of crabs and the presence of broken mussels independently? Explain.
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3.
What are the three hypotheses to explain the low level of herbivory in terrestrial plant communities? Are these hypotheses mutually exclusive? (In other words, can more than one be true?)
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4.
What is the difference between a fundamental niche and a realized niche? How could you show, experimentally, that the fundamental and realized niches for a particular species are different?
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5.
The text claims that species interactions are conditional and dynamic. Do you agree with this statement? Why or why not? Cite specific examples to support your answer.
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