BIOL 2Q04 Lecture Notes - Lecture 12: Net Reproduction Rate, Scion Tc, Optimal Foraging Theory
2 Dec 2015
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Document Summary
Often, but not always, involves killing of prey. Predation is the consumption of one living organism (the prey) by another (the predator) Predators may regulate prey populations (mortality), and prey may regulate predator populations (growth rate) Typical (true) predator: carnivores prey on herbivores or other carnivores. Herbivores: prey on green plants or seeds & fruits. Parasites: live on or in hosts & depend on host for nutrition. Insect parasitoids: free-living adults that lay eggs on or near a host insect, which is killed & eaten. Both predator and prey have one generation per year. Population growth of prey in the absence of a predator: E. g. insect parasitoids (predator) & insect hosts (prey) with predators. Must subtract a term corresponding to number of individuals eaten by predators. Assume predators eat more prey when the prey are abundant, and less prey when they are scarce. Nt+1 = (1. 0 b zt) nt - cntpt. Pt = population size of predators in generation t.
