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Title: The application and validation of in situ ecotoxicological assays at biologically and chemically incongruous sites (379/2/T)
Author: P. Delaney
Author: M. Crane
Author: C. Mainstone
Document Type: Monograph
This interim report describes work undertaken in the first six months of the project. The principal aim of this project is to apply suitable toxicological test systems to field based problems in order to assess the usefulness of these systems to the NRA. The results of the 1990 River Quality Survey undertaken by the NRA have been used to identify possible study sites where the provisional chemical class differs considerably from the provisional biological class. This type of site was considered to be a useful testing ground for these techniques, because it was hypothesised that toxic pollution was the most likely cause of poor biological class and good chemical class. In situ assays were chosen as the primary tools in this study because, like indigenous macroinvertebrate communities, they can be used to integrate site specific effects over different periods of time. However, unlike standard macroinvertebrate survey techniques, they can be used in controlled experiments. They can be placed in different physical compartments of the river and are not constrained by habitat differences. A range of endpoints can be measured, some of them specific to particular classes of pollutants, and certain techniques are able to identify the precise timing of a pollution event. Eight of the ten NRA regions have been visited so far, and potential sites discussed with relevant personnel. The emphasis has been on identifying three sites nationally at which selected ecotoxicological techniques can be deployed on several occasions during a year long exercise.
Publisher: National Rivers Authority
Publication Date: 1992
Publication Place: Bristol
Subject Keywords: EcotoxicologyMusselsMacroinvertebrates
Geographic Keywords: England
Extent: 68; + appendices
Total file downloads: 44

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