Species interactions_Competition09

Species interactions_Competition09 - BSCI 106 Dr Sara Via...

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BSCI 106 Outline 6 Fall, 2009 p. 1 Dr. Sara Via Lecture 6: Population regulation by species interactions- Overview and Competition Observation: We are not (usually) overrun with any given species, even though all species have the potential for exponential growth A. Fundamental question: What controls (regulates) the size of populations? 1. Abiotic Factors -Catastrophic weather -Disturbance that is more or less regular 2. Can biotic interactions within & between species control population size? - if increase in intensity with N - if have density dependent effect on b and d B. Types of species interactions Effect on A B Competition (A B) - - Predation (A B) + - Parasitism (A B) + - Mutualism (A B) + + C. Competition 1. Arises as a direct function of exponential growth—competition occurs for limiting resources 2. By definition, competition always density dependent 3. Can be within or between species D. Kinds of Competition 1. Exploitation (scramble) competition (book #1-4)
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Species interactions_Competition09 - BSCI 106 Dr Sara Via...

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