time012...tpopulation size (at time t)N(0) N(1) N(2) N(t)growth parameterλλλN(1) = N(0)λ=> λ= N(1)/N(0); similarly N(t) = N(0)λt=> λt = N(t)/N(0)This can be converted to an instantaneous growth rate using an exponential: N(t) = N(0)ertwhere r is comparable to λ. The point is that different genotypescould have different λ'sand hence different fitnesses; selection = the difference between genotypes in their growth rates.We can describe the net reproductive rate(Ro) of a genotype or individual in terms of its age specific survivorship and fecundity: x = age, lx = probabilityof surviving from age 0 to age x, mx = number of offspring produces by an individual of age x. Ro= lxmx= expected total offspring per female during her lifetime. Now we can Calculate an lxmx table, or life table.Agelxmx#offspr lx'mx'#offspr'010010010.510.50.50020.4
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