Data from: A migratory divide in the painted bunting (Passerina ciris)

In the Painted Bunting (Passerina ciris), a North American songbird,
populations on the Atlantic coast and interior southern United States are
known to be allopatric during the breeding season, but efforts to map
connectivity with wintering ranges have been largely inconclusive. Using
genomic and morphological data from museum specimens and banded birds, we
found evidence of three genetically differentiated Painted Bunting
populations with distinct wintering ranges and molt-migration phenologies.
In addition to confirming that the Atlantic coast population remains
allopatric throughout the annual cycle, we identified an unexpected
migratory divide within the interior breeding range. Populations breeding
in Louisiana winter on the Yucatán Peninsula, and are parapatric with
other interior populations that winter in mainland Mexico and Central
America. Across the interior breeding range, genetic ancestry is also
associated with variation in wing length, suggesting that selection may be
promoting morphological divergence in populations with different migration
strategies.