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首页> 外文期刊>Marine ecology progress series >Short-term processing of ice algal- and phytoplankton-derived carbon by Arctic benthic communities revealed through isotope labelling experiments
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Short-term processing of ice algal- and phytoplankton-derived carbon by Arctic benthic communities revealed through isotope labelling experiments

机译：同位素标记实验揭示了北极底栖生物对冰藻和浮游植物衍生碳的短期处理

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Benthic ecosystems play a significant role in the carbon (C) cycle through remineralization of organic matter reaching the seafloor. Ice algae and phytoplankton are major C sources for Arctic benthic consumers, but climate change-mediated loss of summer sea ice is predicted to change Arctic marine primary production by increasing phytoplankton and reducing ice algal contributions. To investigate the impact of changing algal C sources on benthic C processing, 2 isotope tracing experiments on C-13-labelled ice algae and phytoplankton were conducted in the North Water Polynya (NOW; 709 m depth) and Lancaster Sound (LS; 794 m) in the Canadian Arctic, during which the fate of ice algal (C-IA) and phytoplankton (C-PP) C added to sediment cores was traced over 4 d. No difference in sediment community oxygen consumption (SCOC, indicative of total C turnover) between the background measurements and ice algal or phytoplankton cores was found at either site. Most of the processed algal C was respired, with significantly more CPP than C-IA being released as dissolved inorganic C at both sites. Macroinfaunal uptake of algal C was minor, but bacterial assimilation accounted for 33-44% of total algal C processing, with no differences in bacterial uptake of C-PP and C-IA found at either site. Overall, the total processing (i.e. assimilation and respiration) of C-PP was 33 and 37% higher than processing of C-IA in NOW and in LS, respectively, suggesting that the future changes in quality of organic matter sinking to the seafloor could impact the C residence time at the seafloor.
机译：通过使到达海底的有机物再矿化，底栖生态系统在碳（C）循环中起着重要作用。冰藻和浮游植物是北极底栖生物消费者的主要碳源，但是，气候变化介导的夏季海冰损失预计将通过增加浮游植物和减少冰藻的贡献而改变北极海洋初级生产。为了调查改变藻类碳源对底栖碳处理的影响，在北水波利尼亚（NOW；深度709 m）和兰开斯特海峡（LS； 794 m）上进行了C-13标记的冰藻和浮游植物的2种同位素示踪实验。 ）在加拿大北极地区，在此过程中，我们追踪了4 d内添加到沉积物核中的冰藻（C-IA）和浮游植物（C-PP）C的命运。在两个地点的背景测量值与冰藻或浮游植物核心之间的沉积物群落耗氧量（SCOC，表示总碳周转量）均未发现差异。大部分经过处理的藻类C都被呼吸了，在这两个位置上释放的CPP均比溶解在其中的无机C释放的C-IA多得多。大型藻类对藻类C的吸收较小，但细菌同化占藻类C总加工量的33-44％，在任一部位发现的C-PP和C-IA细菌吸收均无差异。总体而言，在NOW和LS中，C-PP的总处理（即同化和呼吸）分别比C-IA的处理高33和37％，这表明，下沉到海底的有机物质量的未来变化可能影响C在海底的停留时间。

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