Exploitation vs. interference competition Lotka-Volterra Competition equations Assumptions: linear response to crowding both within and between species, no lag in response to change in density, r, K, constant Competition coefficients ij , i is species affected and j is the species having the effect Solving for zero isoclines, resultant vector analyses Point attractors, saddle points, stable and unstable equilibria Four cases, depending on K/’s compared to K’s Sp. 1 wins, sp. 2 wins, either/or, or coexistence Gause’s and Park’s competition experiments
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Exploitation vs. interference competition Lotka-Volterra Competition equations
Exploitation vs. interference competition Lotka-Volterra Competition equations Assumptions: linear response to crowding both within and between species, no lag in response to change in density, r , K , a constant - PowerPoint PPT Presentation
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Exploitation vs. interference competition
Lotka-Volterra Competition equations
Assumptions: linear response to crowding both within and between
species, no lag in response to change in density, r, K, constant
Competition coefficients ij, i is species affected and j is the species
having the effect
Solving for zero isoclines, resultant vector analyses
Point attractors, saddle points, stable and unstable equilibria
Four cases, depending on K/’s compared to K’sSp. 1 wins, sp. 2 wins, either/or, or coexistence
Gause’s and Park’s competition experiments
Mutualism equations, conditions for stability:
Intraspecific self damping must be stronger than
interspecific positive mutualistic effects.
Diffuse competition: Ni* = Ki – ij Nj
Alpha matrices, N and K vectors
Matrix Algebra Notation: N = K – ANPartial derivatives, ∂Ni/∂Nj sensitivity of species i to changes in j