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26_Consumption - Consumption(predation and herbivory...

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Consumption (predation and herbivory) Today’s questions: I. How does predation affect prey populations? II. How do prey respond to predators? III. How do predators affect communities of species? IV. Why is the world green?
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I. How does predation affect prey populations? Question: Do predators reduce prey populations below the level that can be supported by available resources? Predator removal experiments: l f h b b Wolves, cougars, coyotes removed from the Kaibab plateau 1907 1937 Start: 920 1920:
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d dd l h Predator addition experiments: Restoring wolves to the Greater Yellowstone Ecosystem Wolves were extirpated in the 1920s and i t d d i 1995 ows reintroduced in 1995; elk are the main prey. er 100 co alves pe Create a hypothesis to explain these data: Ca Pre wolf Post wolf Pre wolf Post wolf
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What does this graph mean? lant How does this connect tion vigil to the observation in theprevious graph? Proport Distance to wolves (km)
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II. How do prey respond to predators?
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