BIOL 2060 Lecture Notes - Lecture 18: Petroleum Jelly, Metapopulation, Isocline
Document Summary
Discovered that l-v could show all of these factors ( ** increased predators = higher predation) Prey affect predators, predators affect prery - & because they aren"t synchronized (lag), this creates cycles. Graph on the left is a mutually stable equillibrium. Model is pretty good at accomadating these assumptions. Go round & round & get closer to where the 2 lines cross middle; harder to get out of the middle (stable equillibrium) (red arrow pointing up shouldn"t be there). Graph 2: prey have refuges, so they don"t get eaten at low densities. Graph 1: arrows pointing to centre; very stable equillibrium predator isocline is verys steep & to the left = very efficient. Graph 2: more spirals/cycles to get to the middle. Still stable because it ultimately ends up in the middle, but will take longer. Huffaker (1958): 40 oranges 20 food, 20 covered in paper.
