Population Growth Models

Population Growth Models - Population Growth Models BIO 325...

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Unformatted text preview: Population Growth Models BIO 325 Ecology Recitation What factors affect population growth of a species? Birth Death Immigration of new individuals into the population Emigration of individuals out of the population Intraspecific competition for resources Interspecific competition/ interactions Unexpected environmental conditions Todays lab Many models of population growth exist We will study 4 basic models Single species dynamics 1. Density-independent model of populations with discreet generations 2. Density-independent model of populations with continuous growth 3. Density-dependent model Multi-species dynamics 1. Lotka-Volterra competition Single species dynamics Assumes other species in the environment do not affect population growth of focal species Models Single species dynamics 1. Density-independent model of populations with discreet generations 2. Density-independent model of populations with continuous growth 3. Density-dependent model Multi-species dynamics 1. Lotka-Volterra competition Density-independent geometric growth with discrete generations Simplistic model of population growth Assumptions: Discrete generations, so population grows in discrete time steps Immigration = Emigration Infinite resources, hence density of the population does not affect growth rates Environmental conditions remain the same over the years Examples of species with discrete generations? N t = population size at time t b= births per female per interval p = probability of survival to the next time stage Population size at time t+1 is given by...
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This note was uploaded on 08/25/2009 for the course BIO 325 taught by Professor Crowley during the Summer '08 term at Kentucky.

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Population Growth Models - Population Growth Models BIO 325...

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