Genomic time-series data show that gene flow maintains high genetic diversity despite substantial genetic drift in a butterfly species.

Abstract excerpt

Effective population size affects the efficacy of selection, rate of evolution by drift and neutral diversity levels. When species are subdivided into multiple populations connected by gene flow, evolutionary processes can depend on global or local effective population sizes. Theory predicts that high levels of diversity might be maintained by gene flow, even very low levels of gene flow, consistent with species...

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