A comparison of benthic biodiversity in the North Sea, English Channel, and Celtic Seas
A comparison of benthic biodiversity in the North Sea, English Channel, and Celtic Seas
复制标题
北海、英吉利海峡和凯尔特海底栖生物多样性的比较
DOI：
10.1006/jmsc.1998.0438
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发表时间：
1999
影响因子：
4.5
通讯作者：
S. Boyd
中科院分区：
文献类型：
--
作者：
H. Rees;M. Pendle;R. Waldock;D. Limpenny;S. Boyd
两个补充调查的底栖生物周围的英国海岸线和oVshore的描述。第一次采样的大型底栖动物在英格兰和威尔士海岸线周围的几个站的一个更广泛的跨学科的环境质量评估的监管当局的一部分，白天抓斗。第二次在抓斗站和其他几个站（其中大多数在北海中部和南部）用小桁拖网对表层动物进行了取样。在可比的环境条件下，在英国东部和西部海岸遇到类似的底栖动物组合。潮流速度和沉积物特性占了显着量的观察到的物种丰富度和密度的变化。没有证据表明沉积物中微量金属污染对这些组合结构的测量产生任何不利影响。海岸的影响（接近大河口），深度，潮流速度和温度都有助于解释表生动物组合的分布。然而，沉积物类型似乎是主要的结构化力量，从调查区的北部和西部，即特别是英国海岸线周围收集的样品中含有较粗的成分，支持更广泛的固着类群。抓斗取样提供了明确的定量数据，这些数据可以很容易地与样品小单位面积内的沉积物类型联系起来。拖网提供了更大面积的动物群的综合样本。然而，拖网的设计及其采样效率的固有不确定性决定了调查结果是“操作上确定的”，采样程序的一致性至关重要，特别是对于时间趋势的分析。有必要对沉积物变化不定的拖网沿着环境提供更好的工作描述;声学方法和水下摄影相结合可能是最合适的。
Two complementary surveys of the benthos around the United Kingdom coastline and oVshore are described. The first sampled the macroinfauna by day grab at several stations around the England and Wales coastline as part of a wider interdisciplinary assessment of environmental quality by the regulatory authorities. The second sampled the epifauna with a small beam trawl at the grab stations, and at several additional stations, most of which were in the central and southern North Sea. Similar infaunal assemblages were encountered on both the eastern and western UK coasts in comparable environmental conditions. Tidal current velocity and sediment characteristics accounted for a significant amount of the observed variability in species richness and densities. There was no evidence of any adverse eVects on these measures of assemblage structure arising from trace metal contamination of sediments. Coastal influences (proximity to large estuaries), depth, tidal current velocity, and temperature all helped to explain the distribution of epifaunal assemblages. However, sediment type appeared to be the main structuring force, with a coarser component to samples collected from the north and west of the survey area, i.e. especially around the UK coastline, supporting a much wider variety of sessile taxa. Grab samples provide unambiguously quantitative data which can be easily linked with sediment type within the small unit area of the sample. Trawls provide integrated samples of the fauna over a much larger area. However, both the design of the trawl, and inherent uncertainties over its sampling eYciency, determine that the survey results are ‘‘operationally defined’’, and consistency in sampling procedures is essential, especially for the analysis of temporal trends. There is a need to provide better working descriptions of the environment along trawl tows where sediments are variable; a combination of acoustic methods and underwater photograpy may be most suitable.