Acknowledgements
Pau Aleixandre, Elena Berg, Setefilla Buenavista, John McCormack, Adán
Oliveras de Ita, Vicente Rodríguez, Kristen Ruegg, and Alvar Veiga
provided help with field sampling. Funding was provided by grants
CGL-2011-25866 and CGL-2015-66381 from Spain’s Ministerio de Ciencia e
Innovación to BM, and USA National Science Foundation IOS-1257527 to
TJG.
Data Accessibility Junco hyemalis reference genome deposited in NCBI (Accession
number: QZWM00000000). SNP ‘Full Dataset’, isotopic and georeferenced
datasets are deposited in Dryad, as well as the model files for the
demographic analysis with fastSIMCOAL2 and the R script for the
redundancy analysis. Link for reviewers:
https://datadryad.org/stash/share/RAlwLVkcw2K4HudDCqjp455t2yWE6JmRFNvVu55yWY0
Table 1. Oregon junco forms, number of genotyped individuals
and population genetic diversity indices per locality. Indices include
observed (HO) and expected (HE)
heterozygosity. Figures in the last column correspond to the number of
samples included in the analyses after filtering those with a rate of
missing data above 0.6. State abbreviations are the following: British
Columbia (BC) in Canada; Oregon (OR) and California (CA) in the USA; and
Baja California Norte (BCN) in Mexico. For additional locality
information see Table S1 in the Supplementary Information. The
abbreviation n.b.s denotes UCSD individuals sampled during the
non-breeding season.