Habitat point records from 1990 NRA Medina Estuary survey

The 1990 Rivers Survey includes a quality classification of estuaries to provide a simple assessment of estuarine quality based on dissolved oxygen, aesthetic criteria, and simple biological observations. In an attempt to satisfy the requirements for the biological part of the classification, the sampling was carried out by the NRA Southern Region and samples passed on to Southampton University for infaunal and sediment analysis. Two 0.1m2 surface area grab samples were taken from each site, and sieved through a 1mm screen. Each sample was preserved in 5-8% saline formaldehyde solution. Duplicate samples were taken for particle size and chemical analysis.

1990年河流调查涵盖了潮间带的质量分类，旨在依据溶解氧、审美标准及简易的生物观察，对潮间带质量进行简明评估。为满足分类生物学部分的要求数据，采样工作由美国自然资源保护局南方地区执行，并将采集的样本送至南安普顿大学进行无脊椎动物群及沉积物分析。每个采样点采集了两个0.1平方米的表层抓取样本，并通过1毫米的筛网进行筛选。每个样本均以5-8%的盐水甲醛溶液进行保存。同时，为进行颗粒尺寸和化学分析，还采集了重复样本。