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Population Growth Models: Geometric Growth

Population Growth Models: Geometric GrowthBrook MilliganDepartment of BiologyNew Mexico State UniversityLas Cruces, New Mexico 2009 Brook MilliganPopulation Growth Models: Geometric GrowthPopulation Models in GeneralPurpose of Population modelsProject into the future the current demography ( ,survivorship and reproduction)Guage the potential (or lack) for a Population to increaseDetermine the consequences of changes in the currentdemographyBrook MilliganPopulation Growth Models: Geometric GrowthPopulation Models in GeneralObservables:NorN(age) orN(stage)Project Population sizeNas a function of timetProjection in terms of fundamental parametersdescribing demographic events in an individual s , Pr(birth), Pr(death)enable understanding of how demographic vital rates affectthe whole populationBrook MilliganPopulation Growth Models: Geometric GrowthProjection versus PredictionNo Population experiences unlimited resourcesYet, all populations havepotentialfor exponential growthProjections describepotential, not what is actually predictedto occuranalogy: a speedometer projects potent

Geometric Growth Models General motivation Sequence of population sizes through time N t,N t+1,N t+2,... Change from one time to next increases due to births during period decreases due to deaths during period increases due to immigrants during period decreases due to emigrants during period Brook Milligan Population Growth Models: Geometric Growth

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  Growth, Population, Geometric, Population growth, Geometric growth

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