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Predators Do More Than Kill Prey

Achilles Tang

By Achilles Tang,
in General Reefkeeping_

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Achilles Tang

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The direct effect predators have on their prey is to kill them. The evolutionary changes that can result from this direct effect include prey that are younger at maturity and that produce more offspring. But killing prey also has indirect effects -- rarely characterized or measured -- such as a decline in the number of surviving prey, resulting, in turn, in more food available to survivors. In a new study characterizing the complex ecological interactions that shape how organisms evolve, biologists present a novel way of quantifying the indirect effects of predators by showing that prey adapt to food availability as well as the presence of predators.

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