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Summary of gene flow through immigration and introgression on Daphne Major Island. Numbers refer to immigrants or hybridizing individuals per generation (see §9 for migration rates). Genes flow from G. fortis to G. scandens when the father of an F1 hybrid sings the G. scandens song, and vice versa for gene flow from G. scandens to G. fortis. The species hybridize on Santa Cruz Island to an unknown extent. Geospiza magnirostris hybridizes with G. fortis on Santa Cruz but not on Daphne.
