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首页> 外文期刊>Marine ecology progress series >Contrasting transfer of polonium-210 and lead-210 across three trophic levels in marine plankton
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Contrasting transfer of polonium-210 and lead-210 across three trophic levels in marine plankton

机译：plank210和铅210在海洋浮游生物中三个营养级的对比转移

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The naturally occurring radionuclides ~(210)Po and ~(210)Pb can be used as geochemical tracers in marine systems, but their interactions with biota in surface waters need to be understood before oceanographic data can be interpreted unambiguously. We compared the food chain dynamics of these radionuclides in plankton assemblages by measuring the uptake and trophic transfer of ~(210)Po and ~(210)Pb from phytoplankton to brine shrimp Artemia sp. to euphausiids Meganyctiphanes norvegica under controlled laboratory conditions. The ratio of ~(210)Po:~(210)Pb within organisms increased 5- to 12-fold with each trophic level (phytoplankton to grazer to carnivore), reflecting a preferential bioaccumulation of ~(210)Po over ~(210)Pb. M, norvegica assimilated 44 % of the polonium ingested but only 3.5% of the ~(210)Pb ingested. Because ~(210)Pb was unassimilated, the ratio of ~(210)Po:~(210)Pb was 1 to 2 orders of magnitude smaller in zooplankton fecal pellets than in the animals producing them. These results suggest that in surface waters ~(210)Po has the potential to build up in food chains and be biologically recycled, whereas ~(210)Pb would not build up in marine food chains and would display shorter residence times. Since euphausiids comprise an important link between small plankton and larger predatory animals in many marine ecosystems, they may serve as an important conduit of ~(210)Po to those predators consumed as seafood by humans.
机译：天然存在的放射性核素〜（210）Po和〜（210）Pb可用作海洋系统中的地球化学示踪剂，但是在明确解释海洋数据之前，必须先了解它们与地表水中生物群系的相互作用。我们通过测量〜（210）Po和〜（210）Pb从浮游植物到卤水虾Artemia sp的吸收和营养转移，比较了浮游生物组合中这些放射性核素的食物链动力学。在控制的实验室条件下采集大叶黄杨（Meganyctiphanes norvegica）。 〜（210）Po：〜（210）Pb在生物体内的比例随着每个营养水平（浮游植物，放牧者和食肉动物）的增加而增加了5到12倍，反映了〜（210）Po比〜（210）的优先生物积累铅M，norvegica吸收了44％摄入的lon，但仅吸收了〜（210）Pb摄入的3.5％。由于〜（210）Pb未同化，浮游动物粪便中〜（210）Po：〜（210）Pb的比例比生产它们的动物小1至2个数量级。这些结果表明，〜（210）Pb在地表水中具有在食物链中积累并被生物回收的潜力，而〜（210）Pb在海洋食物链中不会积累，并且显示出更短的停留时间。因为在许多海洋生态系统中，虾类生物都是小浮游生物与大型捕食动物之间的重要纽带，所以它们可能是〜（210）Po通往人类被海产品捕食的重要食道。

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