确定性过程主导高原典型河流浮游植物地理分布格局和群落构建

杨胜娴, 杨清, 李晓东, 巢欣, 刘惠秋, 魏蓝若雪, 巴桑

Deterministic processes dominate the geographic distribution pattern and community assembly of phytoplankton in typical plateau rivers

Shengxian Yang, Qing Yang, Xiaodong Li, Xin Chao, Huiqiu Liu, Lanruoxue Wei, Sang Ba

表1 浮游植物群落共现网络的拓扑结构特征。YJA、YJB、YJC见图1。

Table 1 The topological characteristics of co-occurrence networks of phytoplankton communities. YJA, YJB, YJC see Fig. 1.

网络拓扑指标 Network topological indicators 春季 Spring 夏季 Summer 秋季 Autumn YJA YJB YJC 节点数 Number of nodes 188 181 204 224 246 246 边数 Edges 642 686 687 2,050 2,365 2,558 连接部件 Connected component 45 40 43 1 3 1 网络直径 Network diameter 15 18 12 9 8 11 平均度 Average degree 6.830 7.580 6.735 18.304 19.228 20.797 模块化系数 Modularity coefficient 0.820 0.829 0.806 0.850 0.765 0.853 图密度 Density of figure 0.037 0.042 0.033 0.082 0.078 0.085 平均聚类系数 Mean clustering coefficient 0.854 0.847 0.792 0.841 0.750 0.841 平均路径长度 Mean path length 6.147 6.981 5.332 3.953 3.302 3.851 正相关比例 Positive correlation (%) 100 100 100 99.375 99.493 97.757 负相关比例 Negative correlation (%) 0 0 0 0.625 0.507 2.243