Landscape resistance maps

Raw '.asc' files of the optimal resistance models (IBR; i.e. EN, LandFB_100 and LandFb_50) produced with ARCGIS version 9.3 (ESRI 2009), with a raster cell size set to 50 m. The three different landscape resistance models were previously optimized for the study species at the Basque country level (Ruiz-González et al. 2014). Land_Fb100 and Land_Fb50: Binary landscape resistance maps indicating that pine marten gene flow in is facilitated by forests, forestry plantations, scrubland, agroforestry mosaics and pastures and meadows, and that crops have roughly 100 (LandFb_100) or 50 (LandFb_50) times higher resistance than optimal habitat and the existence of a barrier effect of national roads, highways, urban areas, reservoirs and quarries. Ecological Network resistance map; EN: a resistance map analogous to that used in the design of the ecological network of the Basque country (Gurrutxaga et al. 2010a). Land use information was obtained in vector format from the most recent forest map of Spain (Spanish Ministry of the environment, 2006) and from national road network maps (Spanish National Geographic Institute (2008). Full methodological details for model construction are reported in Table 1 and Appendix S2 (Supporting information).本数据集包含由ArcGIS 9.3版本（ESRI，2009）生成的最优抗性模型（IBR，即EN、LandFB_100与LandFb_50）的原始.asc格式文件，栅格单元尺寸设置为50米。上述三种景观抗性模型此前已针对巴斯克地区的研究物种完成优化（Ruiz-González等，2014）。Land_Fb100与LandFb_50为二值化景观抗性图，其表征为：森林、人工林、灌丛、农林复合镶嵌体以及牧草地与草甸可促进松貂的基因流；农作物的抗性强度约为最优生境的100倍（LandFb_100）或50倍（LandFb_50），且国道、高速公路、城市建成区、水库与采石场存在阻隔效应。生态网络抗性图（EN，Ecological Network resistance map）：该抗性图参照巴斯克地区生态网络规划所采用的抗性图进行构建（Gurrutxaga等，2010a）。土地利用数据以矢量格式获取自西班牙最新森林地图（西班牙环境部，2006）与国家道路网地图（西班牙国家地理研究所，2008）。模型构建的完整方法学细节详见表1与附录S2（补充材料）。