This preview shows pages 1–4. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Predation 1 3 July 1 Predation Predation when an animal eats another organism Typical Predation Typical Predation when an animal eats another animal Herbivory Herbivory when an animal eats a plant Parasitism Parasitism when an animal eats an organism that it lives on or in Lotka LotkaVolterra Predator Volterra PredatorPrey Model Prey Model Population growth rate of prey Population growth rate of prey : d N 1 / d t = r 1 N 1 p N 1 N 2 N 1 = number of prey N 2 = number of predators r 1 = per capita rate of increase of prey p = proportion of N 1 eaten per predator per time unit r 1 N 1 = growth rate of prey without predation = exponential p N 1 N 2 = no. of prey eaten by the predator population = predation rate Example: p = 0.01 prey/day, N1 = 100, N2 = 10, then p N 1 N 2 = 10 prey/day Population growth rate of predator: Population growth rate of predator: d N 2 / d t = ap N 1 N 2 d N 2 a = number of predators produced per prey eaten d = predator per capita death rate ap N 1 N 2 = birth rate of predator population Example: a = 0.1 predator/prey, p N 1 N 2 = 10 prey/day, then ap N 1 N 2 = 1 predator/day Time N 1 N 2 Example: lynxhare cycles Predation 1 3 July 2 N 1 N 1 The effect of adding logistic growth of prey to the Lokta The effect of adding logistic growth of prey to the LoktaVolterra model: Volterra model: N 1 Without sediment With sediment Laboratory Study of Protozoa by Gause Laboratory Study of Protozoa by Gause Prey: Paramecium (logistic growth), Predator: Didinum Predation 1 3 July 3 Laboratory Study of Protozoa by Luckinbill...
View Full
Document
 Spring '08
 Strong,D

Click to edit the document details