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Fig. 3. (a) Wastewater as a percentage of total N load as calculated with the N-loading model of Valiela et al. (1997)(2000) vs. {delta}15N of macrophytes used in this study divided into groupings of macroalgae and plants. (b) Mean annual water-column dissolved inorganic nitrogen (DIN) concentrations vs. {delta}15N of macrophytes used in study divided into groupings of macroalgae and plants.