Exercise
Form 13: Trophic Cascades and Keystone Species
In this engaging exercise, students will explore the intricate relationships within ecosystems by investigating trophic cascades and the vital role of keystone species, culminating in a creative project where they illustrate and present their findings on how these species impact biodiversity and ecosystem stability.
Questions
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MultiChoice
What is a keystone species?
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MultiChoice
What iconic keystone species reintroduction in Yellowstone restored riverbank vegetation?
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MultiChoice
How did reintroducing wolves in Yellowstone affect elk behavior and tree growth?
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MultiChoice
What happens when a keystone predator is removed from a coral reef?
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MultiChoice
A starfish (*Pisaster*) eats mussels in intertidal zones. When removed, mussels crowd out all other species. The starfish is a:
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MultiChoice
A top-down control in a food web means populations are primarily regulated by:
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MultiChoice
A bottom-up control in a food web means ecosystem structure is limited by:
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MultiChoice
Beavers modify environments by building dams, creating wetlands for many species. Beavers are:
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MultiChoice
What is a trophic cascade?
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MultiChoice
If sea otters are removed, sea urchins multiply and destroy kelp. What type of regulation is demonstrated?
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MultiChoice
Can a herbivore ever act as a keystone species?
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MultiChoice
How do elephants act as keystone species in savannas?