Abstract
CENTRAL to the theory of allopatric speciation is the idea that geographic separation of populations will sufficiently restrict gene flow between them to make possible their genetic divergence1. Wright2 has shown that, at equilibrium, the arrival of one migrant on average every other generation is sufficient to keep a population's genetic composition similar to the source of migrants—at least when selection is not too strong. Wright's result has been extended to one- and two-dimensional arrays by Maruyama3.
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SLATKIN, M. Cascading speciation. Nature 252, 701–702 (1974). https://doi.org/10.1038/252701a0
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DOI: https://doi.org/10.1038/252701a0
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