Genomic patterns in the dwarf kingfishers of northern Melanesia reveal a mechanistic framework explaining the paradox of the great speciators.

Furthermore, we recovered a number of marginally significant pairwise D statistics, which could reflect short periods of historical gene flow following initial divergence, before reproductive isolation evolved between geographically proximate island populations, a scenario which would further muddy the signal of the true bifurcating history ( Ferreira et al., 2021 ; Pavón-Vázquez et al., 2021 ).

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