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. 2021 Jul 20;12:4401. doi: 10.1038/s41467-021-24588-6

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Origin of 181 Junco individuals included in the SNP dataset. Map shading (in grayscale) depicts temperature annual range values from WorldClim⁶⁶, plotted in R with package raster⁶⁷. Dot color denotes museum-based taxon assignments; dot size represents the number of individuals from that locale (n = 1 to 4). Population genetic variation from 22,006 genome-wide SNPs structured along four PC axes (b, c) and four RDA axes (d, e) where each dot represents an individual. Colors follow the legend provided in (a). d, e Arrows indicate loadings of eight WorldClim variables (diurnal temperature range, temperature annual range, mean temperature of the warmest quarter, mean temperature of the wettest quarter, mean temperature of the driest quarter, mean minimum precipitation, mean precipitation of the warmest quarter, and mean precipitation of the coldest quarter) in a partial RDA conditioned on PC axes 1 and 2. Source data are provided in the Source Data file.