Headwater stream invertebrate data 1990 [Countryside Survey]

This dataset consists of invertebrate species records, sampled from headwater streams during a survey in 1990. Macro-invertebrates were sampled using standard protocols. The sample area in each stream was a single area of stream-bed whose major habitat types can be sampled within the recommended sampling period of three minutes of active sampling, supplemented by a one minute hand search. The length of river surveyed would normally vary from 5 to 15m. Samples were collected using a standard 1mm mesh pond net and returned to the Centre for Ecology & Hydrology (formerly Institute of Freshwater Ecology) for later sorting and identification. Supplemental physical measurements (width, depth, substrate composition) required to run RIVPACS (River Invertebrate Prediction and Classification System) were taken. Data were collected under the Countryside Survey long term monitoring project managed by the Centre for Ecology & Hydrology. The Countryside Survey is a unique study or 'audit' of the natural resources of the UK's countryside. The sample sites are chosen from a stratified random sample, based on a 15 by 15 km grid of GB. Headwater stream surveys have been carried out in 1990, 1998 and 2007 with repeated visits to the majority of sites. The countryside is sampled and surveyed using rigorous scientific methods, allowing us to compare new results with those from previous surveys. In this way we can detect the gradual and subtle changes that occur in the UK's countryside over time. In addition to headwater stream data, soil data, habitat areas, vegetation species data and linear habitat data are also gathered by Countryside Survey.

本数据集收录了1990年期间对源头溪流进行的无脊椎动物物种记录。采用标准协议对大型无脊椎动物进行了采样。每条溪流中的采样区域为单个溪床区域，其主要栖息地类型可在建议的3分钟主动采样期内被采集，辅以1分钟的徒手搜索。被调查河流的长度通常在5至15米之间。采样使用标准1毫米网孔池塘网进行，并将样本送至生态与水文学研究中心（原名淡水生态研究所）进行后续分类和鉴定。为运行RIVPACS（河流无脊椎动物预测与分类系统）所需的补充物理测量（宽度、深度、底质组成）也已采集。数据收集是在生态与水文学研究中心管理的乡村调查长期监测项目下进行的。乡村调查是对英国乡村自然资源进行的独特研究或‘审计’。采样点根据GB 15×15公里网格进行分层随机选择。源头溪流调查于1990年、1998年和2007年进行，并对大多数站点进行了重复访问。乡村的调查和采样采用严谨的科学方法，使我们能够将新结果与先前调查的结果进行比较。通过这种方式，我们可以检测到英国乡村随着时间的推移所发生的渐进性和细微的变化。除了源头溪流数据外，乡村调查还收集了土壤数据、栖息地面积、植被物种数据和线性栖息地数据。