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首页> 外文期刊>Polar biology >Response Of Antarctic Benthic Communities To Disturbance: First Results From The Artificial Benthic Disturbance Experiment On The Eastern Weddell Sea Shelf, Antarctica
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Response Of Antarctic Benthic Communities To Disturbance: First Results From The Artificial Benthic Disturbance Experiment On The Eastern Weddell Sea Shelf, Antarctica

机译：南极底栖动物群落对扰动的响应：南极东部韦德尔海架人工底栖扰动实验的初步结果

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摘要

The long-term benthic disturbance experiment (BENDEX) was started on the eastern Weddell Sea shelf off Austasen (Antarctica) during 'Polarstern' cruise ANT XXI/ 2 in December 2003 to simulate the impact of grounding icebergs on the seabed and follow the steps and timescales of recovery of disturbed benthos and demersal fish communities. Here, we report the basic approach and first results for this experimental field study. By means of 11 densely-placed hauls with a modified bottom trawl, a seabed area of approximately 100 × 1000 m was artificially scoured to inflict a similar damage to the benthic habitats as a grounding iceberg. Before the disturbance event and 11 days after it, the seafloor communities were sampled (invertebrate assemblages by multibox corers, the fish fauna by trawl hauls) and comparatively analyzed. Sediment texture and chemistry was not significantly altered by the heavy disturbance inflicted by repeated trawling, whereas the fauna was negatively affected. Invertebrate benthic biomass was drastically reduced by a factor of 10, while mean abundances were only slightly reduced. Demersal fish biomass and abundance were slightly but not significantly smaller after the disturbance. Effects of disturbance became more evident in the composition of the fish fauna, with Trematomus pennelli and T. hansoni being dominant at disturbed sites, whereas Chionodraco myersi was the dominant species in trawl catches from undisturbed stations.
机译：长期底栖扰动实验（BENDEX）是在2003年12月“ Polarstern”号ANT XXI / 2号巡洋舰在南极奥斯塔森（Austasen）附近的韦德海东部海架上开始的，以模拟冰山接地对海床的影响，并遵循以下步骤和受灾的底栖生物和深海鱼类群落恢复的时间表。在这里，我们报告了该实验现场研究的基本方法和初步结果。通过11个密集的拖网和改进的底拖网，人工冲刷了约100×1000 m的海底面积，对底栖生境造成了与地面冰山相似的破坏。在干扰事件发生之前和之后的11天，对海底群落进行了采样（通过多箱取芯器收集无脊椎动物的集合，通过拖网捕捞收集鱼类的动物群）并进行了比较分析。反复拖网造成的严重扰动并没有显着改变沉积物的质地和化学性质，而对动物群则造成了负面影响。无脊椎动物底栖生物量急剧减少了10倍，而平均丰度仅略有降低。扰动后，鱼类的底栖生物量和丰度略有降低，但并不显着。扰动的影响在鱼类区系的组成中变得更加明显，在受扰动的地点，Trenatomus pennelli和T. hansoni在受扰动的地方占主导地位，而Myioni的Chionodraco myersi是不受干扰的站拖网渔获物中的主导物种。

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