Niche comparison metrics as calculated in ENMtools.

Here the range overlap (difference in ranges between time periods), relative rank overlap (difference in habitat pairing between time periods), and niche overlap (I) (pairwise niche overlap between time points) metrics are shown. The results (significance or non-significance) of the identity test are also given for each applicable comparison (Relative Rank and Niche Overlap). Due to the nature of the identity test we could only compare point distributions under either the current or the future climate model, as such only two comparisons per model were conducted. Significance of the identity test (p<0.05) is indicated by “*”, whereas non-significance (p>0.05) is indicated by “n.s.”. The analysis indicates highly divergent Historic and Contemporary (current and projected) distributions of O. continuatalis.

本数据集呈现了三类指标：分别为反映不同时段分布范围差异的范围重叠（range overlap）、反映不同时段生境配对差异的相对等级重叠（relative rank overlap），以及反映不同时点间成对生态位重叠的生态位重叠（I）（niche overlap (I)）。同时，针对每一项适用于相对等级重叠与生态位重叠的对比，均给出了同一性检验（identity test）的显著性结果（显著或不显著）。鉴于同一性检验的特性，其仅可在当前气候模型或未来气候模型的框架下对比物种点位分布，因此每个模型仅开展两组对比。同一性检验的显著性以p<0.05标记为"*"，不显著性（p>0.05）则标记为"n.s."。本分析结果显示，O. continuatalis的历史时期分布与当代（当前及预测）分布存在显著分化。