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(a, b) Schematic representation of directed links of (a) a dry and (b) a flooded pond. Note that the direction of the link goes always from dry to flooded ponds simulating amphibian movement. (c, d) Schematic representation of two scenarios relating directed and undirected links of a flooded pond, correlation r. (e, f) Schematic representation of the clustering coefficient C among the flooded ponds connected to a dry pond ((e) C=1; (f) C=0).
