Ecology: Lectures 14

1
Ecology Lectures 14 15

• Predation, Parts 1 2

2
Lotka-Volterra equationPrey isocline (dV/dt 0)
3
Lotka-Volterra equationPredator isocline (dC/dt
0)
4
Lotka-Volterra model with both predator and prey
isoclines
5
Lotka-Volterra predictionPredator-prey flux
through time
6
Rosenzweig-MacArthur Stable cycle
7
Rosenzweig-MacArthur Stable/dampened oscillations
8
Rosenzweig-MacArthur Unstable/increasing
oscillations
9
Rosenzweig-MacArthur Refuge
10
Gauses predation experimentsDidinium predation
on Paramecium
11
Huffakers experiments mite predation and
complex environments
12
Pimentel et al. experiments

• Used parasitoid wasps and host flies as predator
  and prey
• Created metapopulations

13
Functional responses of predator to prey
concentrations

• Type 1 response

14
Functional responses of predator to prey
concentrations

• Type 2 response

15
Functional responses of predator to prey
concentrations

• Type 3 response

16
Tinbergens search image hypothesis for Type 3
responses
http//www-rohan.sdsu.edu/jmahaffy
17
Prey switching
18
Aggregative response
19
Optimal foraging example
20
Lynx and hare cycling
21
Hare and winter vegetation (browse) cycling