Data from: The island-mainland species turnover relationship

Stuart_etal_dataframes.RDataThis R workspace image contains two dataframes, one for anoles and one for terraranans. Each data frame contains pairwise environmental dissimilarity and species turnover values for island and mainland sub regions. The columns are: | geo_dist: geographic distance between sampling areas | climelev.pc.dist: environmental distance between sampling areas from a pca on environmental variables and elevation | log.area.diff: the difference in log area between sampling areas | sor: Sorensen's index of species turnover | jac: jaccard's index | comp.type: Identifies measures as mainland-mainland (m.m), mainland-island (i.m), or island-island (i.i) | comp.nums: identifies the corresponding sampling areas, which are mapped in the accompanying ArcGIS grids in the Stuart_etal_sample_areas.zip fileStuart_etal_sample_areasStuart_etal_sample_areas.zip | This compressed folder contains two ArcGIS grids: ter_m_i_samp (Terraranans) and an_m_i_samp (anoles). Each grid shows the mainland range of the relevant clade (values of 1.0), mainland sampled areas (50xxx) and islands included in the analysis(60xxx)### Stuart_etal_dataframes.RData 本R工作空间镜像文件包含两个数据框，分别对应安乐蜥（anoles）类群与地蟾类（terraranans）类群。每个数据框均收录了岛屿与大陆亚区域的成对环境差异值及物种周转值。各字段说明如下： - `geo_dist`：采样区域间的地理距离 - `climelev.pc.dist`：基于环境变量与海拔的主成分分析（PCA）计算得到的采样区域间环境距离 - `log.area.diff`：采样区域的对数面积差值 - `sor`：索伦森物种周转指数（Sorensen's index） - `jac`：雅卡尔物种周转指数（Jaccard's index） - `comp.type`：用于标识对比类型，分为大陆-大陆（m.m）、大陆-岛屿（i.m）与岛屿-岛屿（i.i）三类 - `comp.nums`：标识对应采样区域，其空间分布可参见配套的`Stuart_etal_sample_areas.zip`压缩包中的ArcGIS网格数据 ### Stuart_etal_sample_areas.zip 该压缩文件夹包含两个ArcGIS网格数据集：`ter_m_i_samp`（对应地蟾类）与`an_m_i_samp`（对应安乐蜥类）。每个网格均标注了对应类群的大陆分布范围（取值为1.0）、大陆采样区域（编号前缀为50xxx）以及本分析纳入的岛屿区域（编号前缀为60xxx）