Fig. 3: Root graft network attributes.
From: Cooperative root graft networks benefit mangrove trees under stress
a Comparison of log-transformed cumulative distribution functions (CDF). The number of direct connections for a given tree (node degree) shows that root graft networks might fit a scale-free power-law distribution with a slope γ = 4.47. But with a min. node degree of 2, the Poisson, log-normal and exponential distributions cannot be discarded. b Linear regression showing a reduction on the average node degree of the networks along the A. germinans stand-density gradient and grafting frequency (%). Shape and colour depict the salinity range of the plots (purple circles <45 ppt, green squares 45–55 ppt and brown triangles ≥55 ppt) and the size of each shape indicates the stand’s grafting frequency. c Linear regression showing an increasing number of groups of grafted trees per hectare with significant reduction in the mean group members (shape size), this is, the number of trees forming a group.
