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Interspecific competitionInterspecific competition: reduction in fecundity, growth, or survivorship suffered by one species as a result of resource expInterspecific competition among Paramecium spp. (Russian ecologist G.F. Gause)Interspecific competition for silicate between two species of freshwater diatoms (Tilman 1981)Competitive exclusion principleDirect evidence of competition from field experiments Effects of kangaroo rat (Dipodomys spp.) removal on the abundance of granivorous and omnivorous rodent species in the ChihuahuCompetition for multiple resourcesIB 153 Interspecific Competition 9/28/20061What are the conditions for equilibrium coexistence of competitors?Insight from a modelIB 153 Interspecific Competition 9/28/20062Case ACase BCase CCase DK1> K2/ α21soK1 α21> K2K1/ α12> K2soK1> K2 α12andCase A: species 1 wins and species 2 is excluded:Interpretation: • Negative effects of K2on K1are less than the negative effects of K1on itself.• Negative effects of K1on K2are greater than the negative effects of K2on itself.Case B: mirror image of Case ACase C: equilibrium coexistence of competitors:K2/ α21> K1soK2> K1 α21K1/ α12> K2soK1> K2 α12andInterpretation: Negative effects of each species on itself are greater than the negative effects each has on the other species.Case D: Outcome of competition depends on initial conditions:K1>K2/ α21soK1 α21> K2K2> K1/ α12soK2 α12>K1andInterpretation: Negative effects of each species on the other are greater than the negative effects each has on


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Berkeley INTEGBI 153 - Interspecific Competition

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