Species interactions_Competition09

Species - BSCI 106 Dr Sara Via Outline 6 Fall 2009 p 1 Lecture 6 Population regulation by species interactions Overview and Competition Observation

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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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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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Species - BSCI 106 Dr Sara Via Outline 6 Fall 2009 p 1 Lecture 6 Population regulation by species interactions Overview and Competition Observation

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