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. 2018 Jul 25;8:11231. doi: 10.1038/s41598-018-29395-6

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© The Author(s) 2018

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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Map of the area with orographic and hydrological details that might act as barriers. USFWS¹² recovery units are delineated in white. Points represent samples used in this study and are colored by the populations inferred by Murphy et al.⁹. The hillshade effect was computed using the hillShade function in the R package raster⁴⁶ after extracting slope and aspect rasters from elevation data at a resolution of 3.6 arc seconds (USGS, and Japan ASTER Program, 2011, SC:ASTGTM.002:2088835414, 1B, USGS, Sioux Falls, 2011-10-07, downloaded from https://earthexplorer.usgs.gov/). The map was generated with the R package raster v2.6 (https://cran.r-project.org/web/packages/raster/index.html).