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首页> 外文期刊>Ecosystems >Land–Ocean Coupling of Carbon and Nitrogen Fluxes on Sandy Beaches
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Land–Ocean Coupling of Carbon and Nitrogen Fluxes on Sandy Beaches

机译：沙滩上碳和氮通量的陆海耦合

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摘要

Rivers link oceans with the land, creating global hot spots of carbon processing in coastal seas. Coastlines around the world are dominated by sandy beaches, but beaches are unusual in that they are thought to rely almost exclusively on marine imports for food. No significant connections to terrestrial production having been demonstrated. By contrast, we isotopically traced carbon and nitrogen pathways leading to clams (Donax deltoides) on beaches. Clams from areas influenced by river plumes had significantly different isotope signatures (δ13C: ?18.5 to ?20.2‰; δ15N: 8.3–10.0‰) compared with clams remote from plumes (δ13C: ?17.5 to ?19.5‰; δ15N: 7.6–8.7‰), showing that terrestrial carbon and sewage, both delivered in river plumes, penetrate beach food webs. This is a novel mechanism of trophic subsidy in marine intertidal systems, linking the world’s largest shore ecosystem to continental watersheds. The same clams also carry pollution signatures of sewage discharged into rivers, demonstrating that coastal rivers connect ecosystems in unexpected ways and transfer contaminants across the land–ocean boundary. The links we demonstrate between terrigenous matter and the largest of all marine intertidal ecosystems are significant given the immense social, cultural, and economic values of beaches to humans and the predicted consequences of altered river discharge to coastal seas caused by global climate change.
机译：河流将海洋与陆地相连，在沿海海域创造了全球碳加工热点。世界各地的海岸线均以沙滩为主，但沙滩却不同寻常，因为人们认为沙滩几乎完全依靠海洋进口来获取食物。没有证明与地面生产有重要联系。相比之下，我们同位素追踪了导致海滩上蛤c（Donax deltoides）的碳和氮途径。与远离羽流的蛤（（δ13 C：？18.5至？20.2‰；δ15 N：8.3–10.0‰）。 > C：？17.5至？19.5‰；δ15 N：7.6-8.7‰），表明陆地碳和污水都以河羽的形式输送到海滩食物网中。这是海洋潮间带系统中一种新颖的营养补贴机制，将世界上最大的海岸生态系统与大陆流域联系在一起。这些蛤c还带有排入河流的污水的污染特征，表明沿海河流以意想不到的方式连接生态系统，并跨陆-海边界转移污染物。鉴于海滩对人类的巨大社会，文化和经济价值，以及全球气候变化导致的河流向沿海海域排放量变化的预期后果，我们证明陆生物质与所有最大的潮间带生态系统之间的联系非常重要。

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  • 来源
    《Ecosystems》 |2009年第2期|311-321|共11页
  • 作者

    Thomas A. Schlacher; Rod M. Connolly;

  • 作者单位

    Faculty of Science Health and Education University of the Sunshine Coast Maroochydore DC Queensland 4558 Australia;

    Australian Rivers Institute - Coast and Estuaries and School of Environment Griffith University Gold Coast Campus Gold Coast Queensland 4222 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    land–ocean coupling; sandy shores; food webs; trophic subsidy;

    机译：陆地-海洋耦合;沙地海岸;食物网;营养补贴;

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