Figure 5.
Allele frequency changes expected in the model of Figure 4, when there is no long-range straying. The dashed curve shows the result after one generation, the thin curve after 10, and the thick curve after 5000 generations, which is presumed to be enough to achieve equilibrium. The hatchery population is on the right, and is plotted as the rightmost two points instead of one, so that it is more visible. A. The results after 10 generations give a sense of the speed with which the equilibrium is approached. B. As less natural selection favors the locally adapted allele, hatchery alleles move farther into the chain of populations. C. With more local migration, the hatchery alleles penetrate farther, and the lcoally adapted allele is barely able to maintain itelf. D. With even more migration, local adaptation collapses.
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