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Unformatted text preview: Competition 1 July 1 Competition a process that occurs when individuals share resources that are in short supply + + Mutualism +- Predation-- Competition Effect of sp 2 on sp 1 Effect of sp 1 on sp 2 Interspecific interactions Interspecific interactions interactions among different species Mechanisms: Mechanisms: Exploitation individuals deplete resources by consuming or using them. Interference aggressive encounters among individuals Intraspecific competition among individuals of the same species Interspecific competition among individuals of different species sp 1=predator Lotka Lotka-Volterra Volterra Model of Interspecific Competition Model of Interspecific Competition Between Species 1 and Species 2 Between Species 1 and Species 2 d N 1 / d t = r 1 N 1 (K 1-N 1- 12 N 2 ) K 1 d N 2 / d t = r 2 N 2 (K 2-N 2- 21 N 1 ) K 2 = competition coefficient = Per capita effect of interspecific competition Per capita effect of intraspecific competition 12 = Per capita effect of sp 2 on sp 1 Per capita effect of sp 1 on sp 1 21 = Per capita effect of sp 1 on sp 2 Per capita effect of sp 2 on sp 2 Competition 1 July 2 Example 1: Exploitative competition Example 1: Exploitative competition two bird species eating two bird species eating exactly the same food types exactly the same food types Number of food items consumed/ day /individual: sp 1 = 10, sp 2 = 20 12 = 20/10 = 2.0 21 = 10/20 = 0.5 Example 2: Interference competition Example 2: Interference competition competition...
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This note was uploaded on 01/06/2010 for the course EVE 101 taught by Professor Strong,d during the Spring '08 term at UC Davis.
- Spring '08