Fig. 4
From: Thresholds of lake and reservoir connectivity in river networks control nitrogen removal
Hydrologic dominance of ponded waters as an indicator of nitrogen removal in the Northeastern United States. a The cumulative hydrologic dominance index throughout the river network (see Methods) indicates where nitrogen removal is dominated by ponded waters or by streams. Ponded waters are hydrologically dominant when the index is greater than one and streams are hydrologically dominant when the index is less than one. Locations void of ponded waters have an index value of one. Cumulative nitrogen removal is generally dominated by ponded waters in portions of the network at the threshold where this index is greater than the ratio of stream to ponded water biological activities. b Cumulative connectivity of ponded waters to the river network (see Methods). Smaller values indicate locations where upstream ponded waters are more connected with the river network. Larger values correspond with larger deviations from the network. Maps created using data from NHD35 and expressions in the Methods
