General Ecology_Mahaffy_Date__041510

General Ecology_Mahaffy_Date__041510 - Predator-prey...

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Predator-prey interactions Predator vs. prey interaction (+, -) Predator often focuses on prey that is the better competitor More abundant/ higher numbers Predation often results in increased diversity Grazing of large herbivores, etc. Models of predator-prey interactions Lotka-Volterra again Change in prey population size over time= rN-aNP N = prey population size r = reproduction P = predator population size a = capture efficiency change in predator population size over time = faNP-dp N= prey population size r = reproduction P = predator population size a = capture efficiency f = feeding efficiency d = death rate Growth rate of a prey population is 0 when P=r/a Population grows when P < r/a Population decreases when P > r/a Growth rate of predator population is 0 when N = d/fa Population grows when N > d/fa Population decreases when N <d/fa Lotka-Volterra model The result of those equations describes the cycling of predators and prey population sizes in relation to each other. Other more complex models actually better describe the cycling of predators and prey population size, but all generally show that predator- prey interactions can cause population cycles. Breakdown cycle in 4 pairs:
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General Ecology_Mahaffy_Date__041510 - Predator-prey...

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