Ecology: Lectures 14 & 15 Predation, Parts 1 & 2

Lotka-Volterra equation: Prey isocline (dV/dt = 0)

Lotka-Volterra equation: Predator isocline (dC/dt = 0)

Lotka-Volterra model: with both predator and prey isoclines

Lotka-Volterra prediction: Predator-prey flux through time

Rosenzweig-MacArthur: Stable cycle

Rosenzweig-MacArthur: Stable/dampened oscillations

Rosenzweig-MacArthur: Unstable/increasing oscillations

Rosenzweig-MacArthur: Refuge

Gause’s predation experiments: Didinium predation on Paramecium

Huffaker’s experiments: mite predation and complex environments

Pimentel et al. experiments  Used parasitoid wasps and host flies as predator and prey  Created metapopulations

Functional responses of predator to prey concentrations  Type 1 response:

Functional responses of predator to prey concentrations  Type 2 response:

Functional responses of predator to prey concentrations  Type 3 response:

Tinbergen’s search image hypothesis for Type 3 responses

Prey switching

Aggregative response

Optimal foraging example

Lynx and hare cycling

Hare and winter vegetation (“browse”) cycling