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time - time 0 1 2 t population size(at time t N(0 N(1 N(2...

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time 0 1 2... t population size (at time t) N(0) N(1) N(2) N(t) growth parameter λ λ λ N(1) = N(0) λ => λ = N(1)/N(0); similarly N(t) = N(0) λ t => λ t = N(t)/N(0) This can be converted to an instantaneous growth rate using an exponential: N(t) = N(0)e rt where r is comparable to λ . The point is that different genotypes could have different λ 's and hence different fitnesses; selection = the difference between genotypes in their growth rates. We can describe the net reproductive rate (R o ) of a genotype or individual in terms of its age specific survivorship and fecundity : x = age, l x = probability of surviving from age 0 to age x, m x = number of offspring produces by an individual of age x. R o = l x m x = expected total offspring per female during her lifetime. Now we can Calculate an l x m x table, or life table . Age l x m x #offspr l x ' m x ' #offspr' 0 1 0 0 1 0 0 1 0.5 1 0.5 0.5 0 0 2 0.4
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