Species point records from 1982 WWA Cardiff sewerage outfalls survey

The benthic macroinvertebrate fauna and the physico-chemical properties of the sediments were described from 66 sites in the vicinities of the Rhymney Valley, Ystradyfodwg and Pontypridd (Y & P) and Cardiff East outfalls discharging to the Severn Estuary. Except in an area close to the Y & P outfall, where redox potential was relatively low (<100 mV at 4 cm depth), the discharges had no perceptible effect on local sediment characteristics. Carbon concentrations were similar (50 mg g-1) to those found generally in this area of the Severn Estuary. A total of 26 taxa were identified and total invertebrate density ranged from 110 to 46,000 m-2. Except for an area close to the Y & P outfall, there was no evidence that the effulent discharges affected the distribution of the benthic macroinvertebrate assemblages around the outfalls were similar to those found generally in this area of the Severn Estuary. Classification analysis suggested that shore height was the environmental feature most closely associated with the distribution of the fauna.

对瑞姆尼山谷、伊斯特拉德福德和庞蒂普里德（Y & P）以及卡迪夫东部的66个地点的底栖大型无脊椎动物群落及其沉积物的物理化学特性进行了描述。除靠近Y & P排放口的一个区域，其中氧化还原电位相对较低（在4厘米深度下小于100毫伏）外，排放物对当地沉积物特性的影响并不显著。碳浓度与该区域塞文河口普遍发现的浓度相似（50毫克/克）。共鉴定出26个物种，总无脊椎动物密度介于110至46,000平方米之间。除靠近Y & P排放口的外，没有证据表明排放物影响了底栖大型无脊椎动物群落的分布，因为排放口附近的群落分布与塞文河口该区域的普遍分布相似。分类分析表明，海岸高度是与动物群落分布最密切相关的环境特征。