空间聚集度指数及其估计不确定性对聚集度-多度关系的影响

邢丁亮

Influence of aggregation indices and estimation uncertainty on the aggregation-abundance relationship

Dingliang Xing

图1 3种聚集度指数之间的相关性。不同的形状和颜色表示中性显式模拟模型中不同的参数(扩散参数σ和成种速率ν见图例)组合。r和ρ分别为不同参数组合下聚集度指数之间的Pearson和Spearman相关系数。k为负二项分布聚集度参数, Ω为Condit等(2000)的相对邻体密度指数, kff为Wiegand等(2025)的距离加权邻体密度指数。

Fig. 1 Correlations among three indices of spatial aggregation. Different shapes and colors represent simulations from a spatially explicit neutral model with various combinations of parameters (dispersal potential, σ; and speciation rate, ν). The values r and ρ denote the Pearson and Spearman correlation coefficients, respectively. k, Aggregation parameter of the negative binomial distribution; Ω, Relative neighborhood density index of Condit et al. (2000); kff, Distance-weighted version of the relative neighborhood density index of Wiegand et al. (2025).