Species point records from 1987 AWA Breydon Water littoral survey

The survey was carried out as an extension intensive surveys of the River Yare earlier in 1987. Also, public concern over the inadequacy of sewage disposal facilities in the Yarmouth area. At present, thirty outfalls discharge crude sewage into the lower River Bure, causing some organic enrichment to the lower River Bure. The survey was carried out in the first week in June 1987. Eight sites were sampled with a cylindrical corer (15cms diam by 20cms deep). Three replicates were taken from the mid horizontal distance point between high and low tides. Cores were taken soon after low water on each occassion. A sub sample from each sample was taken for sediment analysis, the remainder was sieved through a 500 micron sieve. The survey suggests sewage enrichment of the lower estuary increases the productivity but does not adversely affect the species diversity. It was also postulated that much of the mercury discharged through the Norwich sewage works during the previous twenty years has accumulated in the sediments of Breydon Water. The estuary was found to support a healthy, but undiverse invertebrate fauna. The lack of diversity was thought to be due to the homogeneity of the sediment types and the lack of extremes of salinity within Breydon Water. Breydon Water satisfied the biological, chemical, and aesthetic criteria for a class A estuary under the UK Estuarine Classification Scheme. Breydon Water is important as an over-wintering ground for waders, wildfowl and gulls.

本次调查作为1987年早期对耶尔河进行的深入调查的延伸而展开。此外，公众对耶尔默斯地区污水处理设施不足的担忧也促使了此次调查。目前，三十处排放口将未经处理的污水排入下布赖河，导致下布赖河有机物质富集。调查于1987年6月的第一周进行。使用圆柱形取芯器（直径15厘米，深度20厘米）在八个地点进行了采样。在每个潮汐高潮与低潮之间的中水平距离点采集了三个重复样本。每次低潮后立即取芯。从每个样本中取出一部分进行沉积物分析，其余部分通过500微米的筛子进行筛分。调查结果表明，下河口污水富集增加了生产力，但并未对物种多样性产生不利影响。同时，假设在过去的二十年里，通过诺里奇污水处理厂排放的汞大部分已积累在布莱顿水域的沉积物中。该河口支持着一个健康但物种多样性不足的无脊椎动物群落。这种多样性的缺乏被认为是由于沉积物类型的同质性和布莱顿水域中盐度极端值的缺失。根据英国河口分类方案，布莱顿水域满足了一级河口在生物学、化学和美学方面的标准。布莱顿水域作为涉禽、野鸭和海鸥的越冬地具有重要意义。