Fig. 5: Beta-diversity null modeling results.
From: Using metacommunity ecology to understand environmental metabolomes
a Density plot of βNTI results for all comparisons. b Boxplots of average within-scale βNTI results (e.g., only pore water-to-pore water comparisons). Dashed red lines indicate the assembly process thresholds: βNTI < −2 represents homogenous selection, βNTI > 2 indicates variable selection, and |βNTI | < 2 indicates stochastic assembly. Two-sided Mann–Whitney U tests (Surface water n = 7, Pore water n = 14) were used to reveal significant differences between pore water and surface water distributions in panel b, with corresponding p values listed in the figure. Boxes represent the 1st and 3rd quartiles, the horizontal line within the box represents the median, the vertical lines represent extreme values calculated based on the interquartile range, and the points are potential outliers.
