Seagrass meadows capture, transform and store inorganic nutrients, but this ecosystem function can be impacted by anthropogenic nutrient inputs. Severe nutrient enrichment is detrimental for seagrass and its N-storage ability, but the effect of moderate nutrient enrichment is unknown. We aimed to determine how a moderate increase in nutrient availability affects the capture, storage and export of nitrogen in a seagrass meadow. We increased the nutrient availability in small seagrass patches in-situ with ~2.4g m-2 day-1 of N-P-K-fertilizer. Following 30 days of nutrient enrichment, 15N stable isotope labelling was used to trace the uptake, transfer, and loss of nitrogen within sediment, water, and plant compartments in seagrass meadows with or without nutrient enrichment. Moderate nutrient enrichment did not affect nitrogen incorporation by seagrass, but nitrogen uptake into the sediment increased significantly; there was a twofold increase in organic matter δ15N in 5-10 cm deep sediment. Epiphyte biomass was also enhanced by nutrient enrichment. Over 37 days, there was similar loss of 15N regardless of nutrient status, suggesting that nitrogen release from seagrass meadows is unaffected by moderate nutrient enrichment. Longer or greater nutrient imputes may change N-dynamics, but seagrasses appear to buffer the effect of short-term moderate nutrient input.