Species point records from 1994 Ambios Lyme Bay sublittoral sediment survey

Grab sampling of the subtidal benthic invertebrates was attempted at 50 sites in Lyme Bay, Weymouth Bay and Portland Harbour in May 1994. At several sites the substrate was unsuitable for grab sampling and either no sample was obtained or only a qualitative sample was taken. Data from the 43 sites at which quantitative samples were obtained have been analysed by a variety of statistical techniques to determine similarities between the sites. The area has an extremely diverse fauna; over four hundred taxa were recorded in the samples. Sites had an average of 58 taxa and 286 individuals per grab sample. There was very high variability in the number of taxa per grab sample, ranging from 3 to 158. The majority of taxa and individuals were polychaetes, with crustaceans and molluscs the next most important groups in terms of the number of taxa and individuals respectively. Analysis of the biological data and an examination of the sediment types indicated that four major and three smaller groups (clusters) could be recognised. The biology of each of the clusters is described and related to the underlying sediment type. Fifty sampling positions in the study area were arranged in a rectangular grid pattern, with six major sampling lines running east-west and nine oriented north-south. Records currently considered sensitive have been removed from this dataset.

于1994年5月，在莱姆湾、韦茅斯湾和波特兰港的50个地点尝试进行了潮间带底栖无脊椎动物的抓取采样。在多个地点，底质不适宜进行抓取采样，要么未获取样本，要么仅获取了定性样本。通过对获得定量样本的43个地点的数据进行了多种统计技术分析，以确定各地点之间的相似性。该区域生物种类极为丰富；样本中共记录了超过四百个物种。每个地点的平均物种数为58种，每个抓取样本的平均个体数为286个。每个抓取样本中的物种数量存在极高的变异性，范围从3个到158个。大多数物种和个体为环节动物，其次是甲壳类和软体动物，在物种和个体数量方面分别占据重要地位。对生物数据的分析和沉积物类型的考察表明，可以识别出四个主要群组和三个较小群组（聚类）。每个群组的生物学特征被描述，并与其潜在的沉积物类型相联系。研究区域内的50个采样位置以矩形网格模式排列，其中六条主要采样线东西走向，九条采样线南北走向。目前认为敏感的记录已从该数据集中移除。