Eutrophication reduces seagrass contribution to coastal food webs

Abstract Food sources and food web structure in seagrass meadows are important determinants of ecosystem functions services. However, there is little information on the effect eutrophication source contributions meadows. Here we used stable isotopes carbon nitrogen (δ 13 C δ 15 N) to investigate how do different levels nutrient enrichment affect diets consumers within tropical We found that diet macroalgae (mean 24% ± 12% for fish, 21% 5% invertebrates), particulate organic matter 19% 18% 8% sediment 13% invertebrates) fish invertebrates were all higher with concentrations, while epiphytes contributed more lower concentrations. Meanwhile, concentrations decreased trophic position 2.6 0.5 high‐nutrient level, 3.4 0.6 low‐nutrients level) chain length (2.5 2.9 level). Higher reduced contribution through grazing chain, but enhanced flow macroalgal chain. Overall, modified recommend measures be taken decrease input into ecosystems maintain its