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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Benthic macrofauna assemblages and biochemical properties of sediments in two Antarctic regions differently affected by climate change
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Benthic macrofauna assemblages and biochemical properties of sediments in two Antarctic regions differently affected by climate change

机译：受气候变化影响的两个南极地区底栖大型动物群落和沉积物生化特性

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摘要

Lipid, protein and carbohydrate concentrations have been determined in sediment cores from the continental shelf in the South Eastern Weddell Sea (SEWS), where no ice shelves have been present at least for thousands of years, and the continental shelf off the Eastern Antarctic Peninsula (EAP), in the area where two ice shelf collapses occurred in 1995 and 2002. On one hand, SEWS presents an important flux of fresh organic matter to the seabed during summer, whereas on the other hand, the presence of ice shelves in EAP hampered photosynthesis restricting the input of organic matter to advected refractory material. In the present study, biochemical variables and benthic macrofauna abundance, biomass and diversity confirmed differences between the two regions. Lipid concentrations were higher in SEWS than in EAP, whereas carbohydrate concentrations were higher in the latter region. These differences were attributed to the higher concentration of labile and refractory material, respectively. Biomass, abundance and diversity of the macrofauna were higher in SEWS than in EAP, where benthic communities started receiving a fresh organic matter input only after the recent ice shelf collapses. As regards macrofauna composition, both regions presented macrobenthic communities associated to early stages of recolonization.
机译：已经确定了东南韦德海（SEWS）大陆架的沉积物核心中的脂质，蛋白质和碳水化合物的浓度，该地区至少已有数千年没有冰架存在，并且南极东部半岛以外的大陆架（ EAP），在1995年和2002年发生了两次冰架坍塌的地区。一方面，SEWS在夏季向海床提供了重要的新鲜有机物质通量，另一方面，EAP中的冰架受到了阻碍光合作用限制了有机物向对流的耐火材料的输入。在本研究中，生化变量和底栖大型动物的丰度，生物量和多样性证实了这两个区域之间的差异。 SEWS中的脂质浓度高于EAP中的脂质浓度，而后者区域中的碳水化合物浓度较高。这些差异分别归因于不稳定和耐火材料的较高浓度。 SEWS的大型动物的生物量，丰度和多样性高于EAP，底栖动物群落只有在最近的冰架坍塌之后才开始接受新鲜的有机物输入。关于大型动物区系的组成，两个区域都呈现出与重新定殖的早期阶段有关的大型底栖动物群落。

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