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Eco 3_Demography and Life History

Eco 3_Demography and Life History - Ecology Lecture 3 How...

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Forces affecting individual abundance in populations How to estimate population size Dispersion of individuals in populations Metapopulation dynamics Life tables and survivorship curves Life history tradeoffs and traits Ecology, Lecture 3: Demography & Life History 1 Births and immigration add individuals to a population Deaths and emigration remove individuals from a population Births Immigration Deaths Emigration Population Size How many individuals in a population? 2 Absolute Density: Total Counts 3 Absolute Density: Sampling Methods 4
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1 st sample 2 nd sample Mark-Recapture Method 5 Estimation of total population size (N) m/N = x/n N = mn/x N = (12 * 15) / 4 N = 45 m = 12 m = inds marked and released n = 15 x = marked inds recaptured n = total inds captured (in 2nd sample) x = 4 Marked inds. in 1st sample (m) / Total population size (N) = Marked inds. in 2nd sample (x) / Total caught in 2nd sample (n) 6 Density and body size 7 Density Estimates: Relative 8
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Radio collars 9 Tracking movement: PIT tags 10 Clumped Random Uniform Population dispersion patterns 11 Pattern of dispersion 12
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