Fig. 3
From: Thresholds of lake and reservoir connectivity in river networks control nitrogen removal
Proportion of total nitrogen removed annually by an individual ponded water relative to its stream replacement (expressed as a difference) across varying degrees of pond connectivity. The results shown here are of the New England sub-region and for ponded waters with only one intersecting stream reach (see Supplementary Fig. 3 for the remaining ponded waters and for the Chesapeake Bay sub-region). The dominance of a ponded water to remove nitrogen starts to decrease at a threshold in ponded connectivity of 0.36 (±0.09) (see Methods); the dot-plot is colored by pond connectivity (see Eq. (4)) where larger dots designate values above the threshold. Small values of pond connectivity indicate that the ponded water is more connected to the network while large values indicate the ponded water is less connected to the network, as illustrated by the shape examples. The black dots on the shape examples designate the centroid of the ponded water and the gray triangles designate the midpoint of the intersecting stream reach (in red). The threshold in the hydrologic dominance index where a ponded water becomes dominant occurs when it is equal to the ratio of stream to ponded water biological activities, which results from the case when the associated Damköhler numbers are equal (see Eq. (3))
