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Definition: A change in the rate of exploitation of prey by an individual predator as a result of a change in prey density. Type I: Exploitation is directly proportional to prey density. Type II: Exploitation levels off at high prey density (predator satiation). Type III: As Type II, but exploitation is additionally low at low prey density owing to lack of a search image or to efficient prey escape mechanisms.
Source: Ricklefs, Robert E (2001). The Economy of Nature (5th Edition).