Lec6EEMB2W08

Lec6EEMB2W08 - Species Interactions Predation: Species...

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1 Predation: Species interact directly by predation - Members of one species consume those of another species or each other Four basic types: carnivory, parasitism, cannibalism, herbivory Species Interactions What role do predators have in driving the dynamics of their prey populations? Species Interactions - Predation Lotka - Volterra Predator - Prey Model: Assumptions: 1) in the absence of predators, prey populations grow exponentially dt = r N dN Prey population growth: dt = r N - (a P N) dN - Encounters with prey increase with an increase in the numbers of predators (P) and an increase in the numbers of prey (N) - The exact number of prey encountered and consumed depends on the search and attack efficiency of the predator (a ) - Consumption rate of prey = (a P N) Lotka - Volterra Predator - Prey Model: Counteracted by predator birth rates which depend on: - The rate of prey consumption (a P N) - The predator conversion efficiency (f) at turning food into offspring Assumptions: 2) in the absence of food, predator populations decline exponentially dt = - q P dP q = mortality rate
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Lec6EEMB2W08 - Species Interactions Predation: Species...

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