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. 2017 Mar 7;7:43881. doi: 10.1038/srep43881

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Test sites (circles) and seed sources (triangles) used in (a) black spruce and (b) jack pine provenance trials. Differentiated on the map are populations growing at temperatures >1 °C cooler than optimal (blue triangles), within ± 1 °C of optimal (green triangles), and >1 °C warmer than optimal (red triangles). Also shown is the spatial distribution of mean annual temperature values and the geographic range of each species (hatching). Maps were drawn using ARCGIS v.9.3 (ESRI, Redlands, CA, USA; http://www.esri.com/arcgis/about-arcgis).