In summary, within the Xincun Bay seagrass system, aquaculture inputs and wastewater discharges were inferred to result in the observed high N and P availability in the upper intertidal zones and decreasing trend from the west to the southeast in the seagrass meadow. Under this nutrient loading conditions, T. hemprichii showed a considerable plasticity in its physiological levels along the intertidal gradient, as indicated by the differences in the nutrient contents of the tissues, the plant morphology, and the epiphytic algae loads.