Mitogenomes reveal the timing and distribution of divergence events among trans-Beringian birds.

Abstract excerpt

Glacial cycles operating across Beringia have repeatedly exposed large swathes of the Bering Land Bridge, intermittently isolating and reuniting North American and Eurasian taxa. In high-latitude birds, these cycles are hypothesized to have been important in driving divergence and speciation. These repeated events have resulted in multiple trans-Beringian avian sister populations of varying degrees of taxonomic...

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