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首页> 外文期刊>Polar biology >Distribution patterns in the biomass of macrozoobenthic communities in Admiralty Bay (King George Island,South Shetlands, Antarctic)
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Distribution patterns in the biomass of macrozoobenthic communities in Admiralty Bay (King George Island,South Shetlands, Antarctic)

机译：金钟湾（南乔治王岛，南设得兰群岛）大型兽足动物群落生物量的分布模式

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摘要

The distribution patterns of macrozoobenthic communities as shown by the biomass of the higher taxa were investigated in Admiralty Bay. Material was collected at depths ranging from 4 to 500 m (102 quantitative samples), representing the full depth range of this basin and including areas characterized by the different levels of glacial influence. Five community groups were distinguished by multivariate analysis (clustering, MDS) based on the Bray-Curtis similarity index. In the Ezcurra Inlet, the area characterized by intensive glacial processes resulting in a high sedimentation rate, the distribution of biomass was not depth related, but was associated with the intensity of glacial disturbance along the axis of the fjord. The innermost part of this fjord, which receives strong outflows from glaciers, had a low biomass value (2.9 g/ 0.1 m_2) and was dominated by polychaetes. The middle part of the fjord which is not so heavily disturbed had higher biomass values (46.1 g/0.1 m_2) due to the dominance of bivalves. A clear depth gradient of biomass distribution was observed in bottom areas located far from glaciers, in the central basin of the bay, with three zones within the depth ranges 4-30, 40-380, and 400-500 m. The highest mean biomass values (92.5 g/0.1 m_2) were found in the middle sublittoral (40-380 m) dominated by ascidians. In the shallow and deep assemblages, the biomass was lower (33.8 g/0.1 and 30.9 g/0.1 m_2 respectively), most probably associated with the ice disturbance in the shallows and lower food supply in the deepest part of the shelf.
机译：在金钟湾调查了高等分类生物量显示的大型动物群落的分布模式。收集的材料深度为4至500 m（102个定量样品），代表该盆地的整个深度范围，包括以不同程度的冰川影响为特征的区域。通过基于Bray-Curtis相似性指数的多元分析（聚类，MDS）将五个社区群体区分开。在Ezcurra入口，该地区以强烈的冰川过程为特征，导致高沉积速率，生物量的分布与深度无关，但与沿峡湾轴线的冰川干扰强度有关。该峡湾的最内层从冰川流出大量水，生物量值较低（2.9 g / 0.1 m_2），且以多毛cha为主。由于双壳类动物的优势，未被严重干扰的峡湾中部生物量较高（46.1 g / 0.1 m_2）。在海湾中央盆地远离冰川的底部区域观察到了明显的生物量分布深度梯度，深度范围为4-30、40-380和400-500 m的三个区域。在以海生动物为主的中部沿下亚界（40-380 m）中发现了最高的平均生物量值（92.5 g / 0.1 m_2）。在浅层和深层组合中，生物量较低（分别为33.8 g / 0.1和30.9 g / 0.1 m_2），最可能与浅层中的冰扰动和架子最深处的食物供应较低有关。

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