Avian range expansions

We consider two avian range expansions. Collared Dove and House Finch, and compare their observed range expansion rates with the predictions of RD and RT models 

To compare the predictions from (7.43) with the observed values, we need to estimate the parameters T, D, and r. As in previous sections, T is the mean time elapsed between two successive migrations, i.e., the generation time. It can be estimated as the time needed for a newborn individual to grow into an adult and reproduce. When the adult age is reached, individuals leave the paternal territory and fly to new places. Since the available data for the dispersal process correspond to a histogram of frequencies of jump distances, the diffusion coefficient can be calculated from the discrete version of (7.4)  

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