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首页> 外文期刊>Marine ecology progress series >Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland)
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Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland)

机译：沿海淡水和极端季节性会影响北极高峡湾（格陵兰岛的年轻声音）中的有机物来源，质量和迁移

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摘要

Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the seasonal variability of food sources on 2 dominant filter-feeding bivalves (Astarte moerchi and Mya truncata) was also investigated. Results revealed the critical impact of long sea ice/snow cover conditions prevailing in Young Sound corresponding to a period of extremely poor and degraded POM and SOM. Freshwater inputs had a very local impact during summer, with relatively more degraded POM at the surface compared to bottom waters that were less nutritionally depleted but more heterogeneous among the sampled stations. Terrestrial inputs contributed to the SOM composition but showed a large variability along the fjord. Finally, diet analyses underlined the contrasted nutritional conditions, showing much higher lipid reserves in A. moerchi than in M. truncata during winter. Under a scenario with increased freshwater input, such results suggest a decline in organic matter quality and production in Young Sound, with subsequent impacts on benthic food webs.
机译：在气候变化下，北极底栖生态系统有望在初级生产者和/或底栖-上层耦合的动力学方面发生重大变化。但是，缺乏关于物理约束（例如与冰融化有关的梯度）对有机物来源，质量以及诸如峡湾之类的系统中的迁移的影响的知识，可能会阻碍对底栖-浮游耦合响应全球变暖演变的预测。在这里，颗粒状有机物（POM）和沉积性有机物（SOM）的来源和质量沿暴露于极端季节和物理限制（融冰）的高冰河峡湾（Young Sound，NE格陵兰）的内外梯度进行表征。相关的渐变）。还研究了食物来源的季节性变化对两个主要的滤食性双壳类动物（阿斯塔特·莫尔奇和米亚·特伦卡塔）的影响。结果表明，在Young Sound中长海冰/雪覆盖条件的严重影响，对应于一段时间内POM和SOM极差和退化。夏季，淡水输入对当地有很大影响，与底部水相比，地表中的POM降解相对更多，而底部水的营养消耗较少，但采样站之间的异质性更高。地面输入有助于SOM的组成，但沿峡湾显示出很大的变化。最后，饮食分析强调了相反的营养状况，表明冬季的冬虫夏草中的脂类储藏量比特兰卡塔林大得多。在增加淡水投入的情况下，这些结果表明Young Sound有机质的质量和产量下降，从而对底栖食物网产生了影响。

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  • 来源
    《Marine ecology progress series》 |2019年第1期|15-31|共17页
  • 作者

    Bridier Guillaume; Meziane Tarik; Grall Jacques; Chauvaud Laurent; Sejr Mikael Kristian; Menneteau Sylvain; Olivier Frederic;

  • 作者单位

    UBO, Lab Sci Environm Marin LEMAR, UMR 6539, IRD,Ifremer,CNRS, Rue Dumont DUrville, F-29280 Plouzane, France;

    UCN, Biol Organismes & Ecosyst Aquat BOREA, UMR 7208, MNHN,IRD,SU,CNRS,UA, 61 Rue Buffon CP53, F-75005 Paris, France;

    UBO, Lab Sci Environm Marin LEMAR, UMR 6539, IRD,Ifremer,CNRS, Rue Dumont DUrville, F-29280 Plouzane, France|Inst Univ Europeen Mer, Observ Marin, UMS 3113, Rue Dumont DUrville, F-29280 Plouzane, France;

    UBO, Lab Sci Environm Marin LEMAR, UMR 6539, IRD,Ifremer,CNRS, Rue Dumont DUrville, F-29280 Plouzane, France;

    Aarhus Univ, Arctic Res Ctr, Ny Munkegade Bldg 1540, DK-8000 Aarhus C, Denmark|Aarhus Univ, Dept BioSci, Vejlsovej 25, DK-8600 Silkeborg, Denmark;

    UBO, Lab Sci Environm Marin LEMAR, UMR 6539, IRD,Ifremer,CNRS, Rue Dumont DUrville, F-29280 Plouzane, France|UCN, Biol Organismes & Ecosyst Aquat BOREA, UMR 7208, MNHN,IRD,SU,CNRS,UA, 61 Rue Buffon CP53, F-75005 Paris, France;

    UCN, Biol Organismes & Ecosyst Aquat BOREA, UMR 7208, MNHN,IRD,SU,CNRS,UA, 61 Rue Buffon CP53, F-75005 Paris, France|Museum Natl Hist Nat, Stn Marine Concarneau, Pl Croix, F-29900 Concarneau, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Arctic ecosystems; Benthic-pelagic coupling; Organic matter; Climate change; Fatty acids; Stable isotopes; Young Sound;

    机译：北极生态系统;底栖-上层耦合;有机物;气候变化;脂肪酸;稳定同位素;年轻声音;

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