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首页> 外文期刊>Marine ecology >Benthic megafauna on steep slopes at the Northern Mid-Atlantic Ridge
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Benthic megafauna on steep slopes at the Northern Mid-Atlantic Ridge

机译：大西洋中脊北部陡坡上的底栖大型动物

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摘要

The role of small-scale (<10 km) habitat availability in structuring deep-sea hard substratum assemblages is poorly understood. Epibenthic megafauna and substratum availability were studied on steep slopes at the Mid-Atlantic Ridge from May to July 2010 northwest, northeast, southwest and southeast of the Charlie-Gibbs Fracture Zone (CGFZ; 48-54 degrees N) at between 2095 and 2601 m depth. Megafauna were six times denser north of the CGFZ compared with the south and differences in density were almost entirely driven by sessile fauna. There was no significant difference in habitat availability amongst sites. Rocky substratum made up 48% of the total area surveyed, with individual transects having between 0% and 82% rock. Assemblage structures were different amongst all superstations. The north was dominated by demospongids and hexactinellids, whereas the southern superstations were dominated by antho-zoans and hexactinellids. Differences in megafaunal assemblages north and south of the CGFZ primarily reflected variations in demospongid and antho-zoan species composition. With 213-1825 individuals.ha(-1), and 7-24 species per superstation, hexactinellids were the most species-rich (36 species) and cosmopolitan taxa at the study site, supporting observations elsewhere along the ridge and in the CGFZ. The absence of significant differences in substrata availability suggested alternative drivers for density or percentage cover. The amount of hard substratum available only limited sessile megafauna density at one transect that was entirely covered with sediments. Species richness was highest for areas with intermediate values of substratum coverage (35-43% rock).
机译：人们很少了解小规模（<10 km）栖息地的可用性在构造深海硬基质组合中的作用。在2095至2601 m之间，在Charlie-Gibbs断裂带（CGFZ；北纬48-54度）的西北，东北，西南和东南部，对大西洋中脊陡坡上的表层巨动物群和地下可利用性进行了研究。深度。大型动物区系在CGFZ以北的密度是南部的6倍，密度的差异几乎完全由无柄动物驱动。各地点之间的生境可用性没有显着差异。岩石基底占被调查总面积的48％，单个样带的岩石介于0％和82％之间。在所有超级车站中，装配结构都不相同。北部以海绵状海绵体和六倍体为主体，而南部的超级车站则以破甲虫和六倍体为主体。 CGFZ北部和南部大型动物群落的差异主要反映了海绵状海绵体和动物区系物种组成的变化。六倍体昆虫拥有213-1825个个体.ha（-1），每个超级站点有7-24种，是研究地点中物种最多的物种（36种）和国际大类类群，支持沿山脊和CGFZ的其他地方的观测。地下可用性的差异不明显，提示密度或覆盖率的替代驱动因素。在一个完全被沉积物覆盖的样带上，可用的硬质基质的数量仅是有限的无柄大型动植物密度。底物覆盖率中等的地区（岩石占35-43％）的物种丰富度最高。

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