Table 3. Parameter estimates for Thuja plicata andTsuga heterophylla for the model selected more often for the data, “AV + sc + bot/exp”. The population sizes, N inland and N coast, are in units of the number of alleles in the population. All of the events, Tdiv, Tbot andTexp , are in units of coalescent generations. The magnitude of the bottleneck, btnmag, indicates the instantaneous shrinkage of the population by that proportion. The growth rates indicate population size change, backward in time, as the number of alleles removed from the population per generation. Thus, a negative rate indicates population expansion forward in time. The migration rates indicate the proportion of alleles moving to the other population per generation. The mutation rate is in substitutions per site per generation.