Age x Nx lx mx 1000 1 1 500 05 2 120 012 3 3 110 011 4 Make a life cycle

Age x nx lx mx 1000 1 1 500 05 2 120 012 3 3 110 011

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Age x Nx lx mx 0 1000 1 0 1 500 0.5 0 2 120 0.12 3 3 110 0.11 4
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Make a life cycle diagram from the following life table. Age x Nx lx mx 0 1000 1 0 1 500 0.5 0 2 120 0.12 3 3 110 0.11 4 0.5 0 1 2 3 4 3 0.12/0.5 = 0.24 0.11/0.12 = 0.92
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Calculate population growth from the life table. Age x Nx lx mx 0 1000 1 0 1 500 0.5 0 2 120 0.12 3 3 110 0.11 4 R 0 = Σ l x • m x Σ x • l x • m x R 0 ln R 0 T T= r= Lifetime reproductive success Generation time Per capita rate of population growth Geometric rate of change l = e r
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Calculate population growth from the life table. Age x Nx lx mx lx∙mx x∙lx∙mx 0 1000 1 0 0 0 1 500 0.5 0 0 0 2 120 0.12 3 0.36 0.72 3 110 0.11 4 0.44 1.32 R 0 = Σ l x • m x Σ x • l x • m x R 0 ln R 0 T T= r= =0.8 (not replacing) l = e r =2.04/0.8 = 2.55 yrs = -0.088 = 0.92
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Outline Measuring demographic rates Survivorship curves Architecture of life tables Density-dependence: Test: demographic rates change with population density Consequence: Logistic vs. geometric or exponential population growth Age structure: outcome of demographic rates over time
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