7_ outline Predation&Mimicry09

7_ outline Predation&Mimicry09 - BSCI 106 Dr. Sara Via...

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BSCI 106 Fall, 2009 p. 1 Dr. Sara Via Lecture 7 Species interactions II: Consumption (predation and herbivory) A. What is predation: one species consumes another 1. Types of interactions involving consumption: Type Mode? Prey population reduced? Predator kill & eat right away Herbivore eat alive depends on whether entire plant consumed Parasitoid eat alive after a lag Parasite eat alive maybe Disease eat alive maybe 2. Does predation affect prey population size? 3. Could predation regulate prey pop.size ? 4. Predation is usually density-dependent B. Example- mites 1. Predation CAN keep prey pop. well below carrying capacity. 2. Mite alone- cycles 3. Predators can drive prey “locally extinct” Efficient predator quickly kills all the prey. C. Can predators and prey ever coexist? 1. Predators and prey can only coexist if there are places for prey to hide (refugia) -in simple environment- all killed 2. Huffaker’s orange experiment a. complex environment - trays of oranges. time is wasted looking for prey b. Hide and seek - Predator efficiency reduced in complex habitats
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BSCI 106 Fall, 2009 p. 2 Dr. Sara Via D. Competition and predation can interact
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This note was uploaded on 10/05/2009 for the course BSCI 106 taught by Professor Porter during the Fall '08 term at Maryland.

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7_ outline Predation&Mimicry09 - BSCI 106 Dr. Sara Via...

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