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3 不同参数组合(扩散参数σ和成种速率ν)模拟空间明晰中性群落中的聚集度-多度关系。黑色小圆圈与对应的回归线代表以负二项分布参数k度量聚集度(聚集度 = 1/k)的结果, 红色小方块和对应回归线代表以kff度量聚集度的结果。实线为加权回归, 虚线为非加权回归。β和SE为回归斜率和对应的标准误。

Fig. 3 Relationships between spatial aggregation and species abundance for simulated spatial-explicit neutral communities with different combinations of parameters (dispersal potential, σ; and speciation rate, ν). Aggregation is measured using either the negative binomial parameter k (where aggregation = 1/k; black circles) or the kff index (red squares). Solid and dashed lines represent weighted and non-weighted least-square regressions, respectively. β and SE denote the regression slope and its standard error.