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Eutrophication reduces seagrass contribution to coastal food webs

机译：富营养化将海草对沿海食品网的贡献降低

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Food sources and food web structure in seagrass meadows are important determinants of ecosystem functions and services. However, there is little information on the effect of eutrophication on food source contributions and food web structure in seagrass meadows. Here we used stable isotopes of carbon and nitrogen (δ~(13)C and δ~(15)N) to investigate how do different levels of nutrient enrichment affect the diets of consumers and food web structure within tropical seagrass meadows. We found that the diet contributions of macroalgae (mean 24%?±?12% for fish, 21%?±?5% for invertebrates), particulate organic matter (mean 19%?±?12% for fish, 18%?±?8% for invertebrates), and sediment organic matter (mean 24%?±?13% for fish, 21%?±?8% for invertebrates) to fish and invertebrates were all higher in seagrass meadows with higher nutrient concentrations, while seagrass and epiphytes contributed more to consumers in seagrass meadows with lower nutrient concentrations. Meanwhile, higher nutrient concentrations decreased the trophic position (mean 2.6?±?0.5 in high‐nutrient level, 3.4?±?0.6 in low‐nutrients level) of consumers and food chain length (2.5 in high‐nutrient level, 2.9 in low‐nutrients level). Higher nutrient concentrations reduced the contribution of seagrass carbon to consumers through the grazing food chain, but enhanced the flow of macroalgal carbon to consumers through the grazing food chain. Overall, eutrophication modified the food web structure of seagrass meadows. We recommend that measures be taken to decrease nutrient input into seagrass ecosystems to maintain its important functions and services.
机译：海草草甸的食物来源和食品网状结构是生态系统功能和服务的重要决定因素。然而，有关富营养化对海草草甸食品源贡献和食物网结构的影响的信息很少。在这里，我们使用稳定的碳和氮（δ〜（13）C和δ〜（15）n）来研究不同水平的营养富集如何影响热带海草草甸的消费者和食品网结构的饮食。我们发现，Macroalgae的饮食贡献（平均24％？±12％的鱼，无脊椎动物的21％？±5％），颗粒状有机物（平均19％？±12％用于鱼，18％？±无脊椎动物的8％），和沉积物有机物（平均24％？±13％的鱼，21％？±8％的无脊椎动物）在海草草地上具有较高的营养浓度，而海草则均高得多，而海草EBIPHYES在海草草甸中的消费者贡献了较低的营养浓度。同时，更高的营养浓度降低了营养位置（平均2.6？±0.5，在低营养水平，3.4°±0.6，低营养水平）消费者和食物链长度（2.5以高营养水平，2.9 - 营养水平）。较高的营养浓度通过放牧食物链降低了海草碳对消费者的贡献，而是通过放牧食物链增强了大类碳的流量给消费者。总体而言，富营养化改性了海草草甸的食物网结构。我们建议采取措施将营养投入减少到海草生态系统中，以维持其重要功能和服务。

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