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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hyperbenthic community structure over oligotrophic continental shelves and upper slopes: Crete (South Aegean Sea, NE Mediterranean)
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Hyperbenthic community structure over oligotrophic continental shelves and upper slopes: Crete (South Aegean Sea, NE Mediterranean)

机译：贫营养大陆架和上坡上的高底栖动物群落结构：克里特岛（南爱琴海，地中海北部）

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摘要

The community structure of hyperbenthos on continental shelves and upper slopes of oligotrophic areas have been little studied. The present study, located in the eastern Mediterranean (Heraklion Bay, Crete) gives the first description of this using samples collected at depths ranging between 50 and 300 m in two seasonal occasions (March and September 2001) using a modified hyperbenthic sledge (0.5 mm mesh size) specifically designed to resuspend the sediment surface and to sample simultaneously the hyperbenthic macrofauna. The analysis revealed 96 different taxa (Peracarida and Decapoda) with densities ranging from 198 to 2618 ind 100 m~(-2) and indicated the presence of a clear zonation of the hyperbenthic communities along a depth gradient as well as different diel and seasonal adaptations to the prevailing environmental conditions of the community structure. Artificial resuspension of the sediment surface revealed that the highest proportion of the hyperbenthic macrofauna collected in this oligotrophic environment (74-100 %) was found to reside at the sediment-water interface (0-0.05 m). This demersal behaviour seems to be a response to high light levels close to the seabed and availability of food sources associated with the sediment surface.
机译：大陆架和贫营养区上坡的高底栖动物的群落结构很少研究。本研究位于地中海东部（克里特岛赫拉克利翁湾），使用修改过的高底雪橇（0.5毫米）在两个季节性场合（2001年3月和2001年9月）在50至300 m深度范围内采集的样本对此进行了首次描述。网眼尺寸）专门设计用于重悬沉积物表面并同时采样高底栖大型动物群。分析揭示了96种不同的分类单元（Peracarida和Decapoda），密度从198到2618 ind 100 m〜（-2），并指出了沿深度梯度高底栖动物群落的清晰区域，以及不同的diel和季节适应适应社区结构的主要环境条件。对沉积物表面的人工重悬表明，在这种贫营养环境中收集的高底栖大型动物最多（74-100％）位于沉积物-水界面（0-0.05 m）。这种沉没行为似乎是对靠近海床的高光照水平以及与沉积物表面相关的食物来源的响应。

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