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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dynamic sedimentary environments of an Arctic glacier-fed river estuary (Adventfjorden, Svalbard). II: Meio- and macrobenthic fauna
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Dynamic sedimentary environments of an Arctic glacier-fed river estuary (Adventfjorden, Svalbard). II: Meio- and macrobenthic fauna

机译：北极冰川河河口的动态沉积环境（Adventfjorden，斯瓦尔巴特群岛）。 II：大型底栖动物区系

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The paper examines the meio- and macrobenthic responses to physical disturbance and sediment instabilities in a small Arctic glacier-fed river estuary. Zajaczkowski and Wtodarska-Kowalczuk [Zajaczkowski, M, Wtodarska-Kowalczuk, M., 2007. Dynamic sedimentary environments of Arctic glacier-fed river estuary (Adventfjorden, Svalbard). I. Flux, deposition, and sediment dynamics. Estuarine, Coastal and Shelf Science 74(1—2), 285—296] distinguished three zones in Adventfjorden (west Spitsbergen) estuary: the tidal flat, the slope (high sedimentation, frequent sediment slides), the central basin (low sedimentation, stable sediments). The numbers of individuals and species of meio- and macrofauna were very low on the tidal flat. The total densities of meio- and macrofauna were significantly lower on the slope of the glacio-fluvial delta than in the central basin. Only the macrofauna responded to sediment instabilities on the slope by a significant decrease in total biomass. Nematodes inhabiting the slope sediments were larger than those in the central basin, although there was no significant difference in the size of harpacticoids in the two zones. The frequently disturbed, resuspended, and redeposited slope sediments were colonized by the opportunistic polychaete Capitella capitata agg. and by the high sedimentation resistant polychaetes Chaetozone setosa agg. and Cossura longocirrata. Tube-dwelling, sedentary, or suspension-feeding fauna only occurred at the central basin stations. The species richness and ratio of surface-dwelling to burrowing deposit-feeders in the macrobenthic communities decreased towards the river mouths. The differences in the taxonomic composition of communities inhabiting the sediments of the slope and the central basin were less pronounced in meiofauna (studied at a higher taxonomic level) than in the macrofauna (identified to the species level). Nevertheless, the differences were significant for both benthic compartments (ANOSIM test, P ＜ 0.05). The simultaneous survey of meio- and macrobenthic communities in an Arctic glacier-fed river estuary shows that both benthic compartments are sensitive to sediment instabilities and physical disturbance caused by high sedimentation and frequent sediment gravity flows.
机译：本文研究了北极冰川河河口中小型和大型底栖动物对自然扰动和沉积物失稳的响应。 Zajaczkowski和Wtodarska-Kowalczuk [Zajaczkowski，M，Wtodarska-Kowalczuk，M.，2007年。北极冰川河河口的动态沉积环境（Adventfjorden，斯瓦尔巴特群岛）。 I.流量，沉积和沉积物动力学。河口，海岸及陆架科学74（1-2），285-296]区分了Adventfjorden（西斯匹次卑尔根）河口的三个区域：潮滩，坡度（高沉积，频繁的泥石流），中央盆地（低沉积，稳定的沉积物）。潮滩上小型和大型动物的个体和种类数量非常少。冰川-河流三角洲斜坡上的中，大型动物的总密度明显低于中部盆地。只有大型动物才对斜坡上的沉积物失稳作出反应，使总生物量显着减少。居住在斜坡沉积物中的线虫比中部盆地的线虫要大，尽管在这两个区域中类线虫的大小没有显着差异。经常扰动，重悬和重新沉积的斜坡沉积物被机会性多毛Cap Capitella capitata agg定殖。并由高沉积抗性多毛龟Chaetozone setosa agg。和Cossura longocirrata。管居，久坐或悬浮喂养的动物只出现在盆地中心站。在大型底栖动物群落中，物种丰富度和地表栖居与穴居给养动物的比例向河口方向降低。与大型动物区系（确定为物种水平）相比，中型动物区系（在较高的分类学层次上研究）在斜坡和中部盆地沉积物群落的生物分类组成上的差异不那么明显。尽管如此，两个底栖舱室的差异仍显着（ANOSIM测试，P ＜0.05）。对北极冰川河河口中底和大型底栖动物群落的同步调查显示，两个底栖区室对高沉积和频繁的泥沙重力流引起的泥沙不稳定性和物理扰动敏感。

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