Chapter 15

Chapter 15 - Chapter 15 Dynamics of Consumer-Resource...

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Chapter 15- Dynamics of Consumer-Resource Interactions Consumers can limit resource populations o Populations are self limiting because resources become scarcer as consumer populations grow Time delays and population cycles o Most predator-prey interactions also have built-in time delays because of the time required by both populations to produce offspring o Period and intensity of the cycle depends on the physical environment o Time delays Predators- response to prey density Prey- response to host abundance o Spatial dynamics Prey escape predators in space o Lotka-Volterra model- predicts the oscillations in the abundances of predator and prey populations, with predator numbers lagging behind those of prey (rate of change in the prey population)= (intrinsic growth rate of the prey pop) – (the removal of prey individuals by predators) dV/dt= rV – cVP cVp= capture efficiency * encounter rate o joint population trajectory- change in predator prey pops together follows
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This note was uploaded on 03/22/2012 for the course PB 360 taught by Professor Wentworth during the Fall '08 term at N.C. State.

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Chapter 15 - Chapter 15 Dynamics of Consumer-Resource...

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