Raw data

This csv file contains all raw data needed to run the R-script provided in this digital repository. Briefly, the first row of this file is the heading, and the next 218 rows correspond to the values of geographic coordinates (decimal degrees), species richness (integer), phylogenetic diversity (numeric), dissimilarity matrices (based on Simpson Index and PhyloSor-sim), number of survey methods (integer), number of sampling period (integer, years), survey methods (eigth dummy variables), bioclimatic space (factor, northern-AF = 1; southern-AF = 2), environmental variables (12 predictors related to thermal, water, and topographic conditions), spatial filters (58 distance-based Moran's Eigenvector Maps), and phylogenetic structure (mean pairwise phylogenetic distance within snake assemblages).

本CSV文件包含了运行本数字仓储中提供的R脚本所需的全部原始数据。简言之，该文件首行为表头，后续218行依次对应各变量的取值：地理坐标（geographic coordinates，十进制度数格式）、物种丰富度（species richness，整数型）、系统发育多样性（phylogenetic diversity，数值型）、相异性矩阵（dissimilarity matrices，基于辛普森指数（Simpson Index）与PhyloSor-sim构建）、调查方法数量（整数型）、采样周期数（整数型，单位为年）、调查方法（由8个虚拟变量表征）、生物气候空间（bioclimatic space，因子型变量，其中北部非洲区（northern-AF）赋值为1，南部非洲区（southern-AF）赋值为2）、环境变量（共12个与温度、水分及地形条件相关的预测因子）、空间过滤因子（spatial filters，包含58个基于距离的莫兰特征向量映射（Moran's Eigenvector Maps））以及系统发育结构（phylogenetic structure，即蛇类集合内的平均成对系统发育距离）。