Patterns in deep-sea macrobenthos at the continental margin: standing crop, diversity and faunal change on the continental slope off Scotland
Patterns in deep-sea macrobenthos at the continental margin: standing crop, diversity and faunal change on the continental slope off Scotland
复制标题
DOI：
10.1023/a:1004143816391
复制
发表时间：
2000-12-01
期刊：
影响因子：
2.6
通讯作者：
Vecino, JLG
中科院分区：
文献类型：
--
作者：
Gage, JD;Lamont, PA;Vecino, JLG
在深海拖网和石油勘探日益重要的苏格兰大陆坡，利用箱形岩芯样本研究了大型底栖动物群落结构和组成的与深度有关的模式。随着深度的增加，生物量和动物区系丰度呈明显下降趋势，但结果也表明，在大陆架边缘以下最浅的样品中，大型底栖生物的生物量和数量减少，因为那里沉积物较粗，底流很强。在最浅的站点，物种多样性也有所减少。可能是由水动力干扰引起的，但没有明显的中坡物种多样性的高峰描述西北大西洋。大型底栖动物群落的分类组成显示最大的变化之间约1000和1200米，表示为一个主要的二分法，在多变量分析的聚类分析和排序。它还表现为新的大型底栖动物物种的积累速度呈阶梯式增长。这与水动力状况的变化相对应，即海底富含悬浮物和界面摄食的底栖动物。从大型穴居存款饲养者的生物痕迹很发达的地方。和海底照片中罕见的可见表生动物。它也对应于较早对拖网和底栖雪橇样品中的巨型动物棘皮动物进行研究的深度区域，在该区域，动物组成的跨坡变化率也出现了明显的峰值。
Depth-related patterns of macrobenthic community structure and composition have been studied from box-core samples from the Scottish continental slope where deep-sea trawling and oil exploration are becoming increasingly important. There is a strong pattern of declining biomass and faunal abundance with increasing depth, but results also indicate reduced biomass and numbers of macrobenthos in the shallowest samples from just below the shelf edge where there are coarse sediments and a regime of strong bottom currents. There is also reduced species diversity at the shallowest stations. probably caused by hydrodynamic disturbance, but no clear mid-slope peak in species diversity as described from the northwest Atlantic. Taxonomic composition of the macrobenthic community shows most change between about 1000 and 1200 m, expressed as a major dichotomy in multivariate analysis by cluster analysis and ordination. It also shows up as a step-like increase in the rate of accumulation of new macrofaunal species. This corresponds to a change in hydrodynamic regime, from a seabed rich in suspension- and interface-feeding epifauna. to one where biogenic traces from large, burrowing deposit feeders are well developed. and visible epifauna rare in seabed photographs. It also corresponds to the depth zone where earlier study of megafaunal echinoderms in trawl and epibenthic sled samples also shows a clear peak in across-slope rate of change in faunal composition.