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Understanding Population Dynamics: Density, Growth, and Evolution

Learn about populations, their characteristics, dynamics, and growth theories related to density independence and life tables. Explore how selection shapes evolution and genetic structure within actively interacting individuals over time.

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Understanding Population Dynamics: Density, Growth, and Evolution

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  1. Populations

  2. What is a population? • a group of actively interacting and interbreeding individuals in space and time.

  3. populations are characterized by: -density, -distribution in space, -age structure, -sex ratio,-birth rate, -death rate, -emigration rate, -immigration rate,-genetic structure. - Selection operates on individuals, populations evolve

  4. Density Dynamics Density change is a function of: Birth rate, immigration rate and Death rate, emigration rate

  5. Population Size • Theory of population growth

  6. Population Growth (Density Independence)‏ • Nt+1 = RNt • where Nt is the population size at time t • and R is the reproductive value • -if R=2 then populations increase as 1,2,4,8,16 etc. =2t • rewritten as Nt = Rt • - If R=1 ? If R<1 ?

  7. Life Tables

  8. Life tables Cohort vs Static x - age lx – survivorship mx –age specific fecundity R= net reproductive rate = Σ lx * mx G= generation = Σ x*lx * mx / R Assumes stable age distribution

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